How long is the flight from Illinois to Sydney?

A quick flight from Illinois to Sydney can take about 25h 01m. Qantas Airways provides one of the quickest options available for as low as $1,946. The distance between Illinois and Sydney is about 14571 km. Both multi-stop and direct flights can be found to your destination and back. Find deals

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm. Find deals

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

What are the most popular routes from Illinois to Sydney?

When deciding which route to take from Illinois to Sydney, consider Chicago O'Hare Intl - Sydney Kingsford Smith, Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, as they are the most popular.

What airport do you fly into for flights to Sydney from Illinois?

Located just 7.5 km from the city centre, Sydney Kingsford Smith (SYD) is the airport most travelers will use when flying to Sydney from Illinois.

Can I find deals for flights from Illinois to Sydney that include hotel bookings?

Yes. In addition to deals on Illinois to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Illinois to Sydney?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Sydney.

Can I find deals for business class flights from Illinois to Sydney?

Yes. Cheapflights offers flight deals from Illinois to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$799+ Cheap Flights from Illinois to Sydney

Q: How much does it cost for a return flight from Illinois to Sydney?

Airfare is typical for this route at the moment. Illinois to Sydney flights typically cost between $1,418 and $2,361 in October. The cheapest return flight price found within the last 3 days was $1,764 on Multiple Airlines (22 Oct-24 Oct). Find deals

Cheap flight deals from Illinois to Sydney

Round-trip from	$1,511
One-way from	$799
Popular in	December
Cheapest in	August
Average price	$1,497

Qantas Airways
5/11-23/11
3 total stops
75h 58m total
Illinois to Sydney

Search Deals

9/11
3 total stops
58h 50m total
Illinois to Sydney

Search Deals

Highest demand for flights based on searches. 15% potential increase in price ($412 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($84 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from Illinois to Sydney

Cheapest flights from Illinois to Sydney
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Wed 5/1107:00STL - SYD

2 stops33h 50mQantas Airways

Sun 23/1114:05SYD - STL

1 stop19h 27mQantas Airways

Deal found 16/9$1,655

Mon 29/906:00PIA - SYD

2 stops34h 00mUnited Airlines

Sat 4/1010:20SYD - PIA

2 stops26h 07mUnited Airlines

Deal found 16/9$1,697

Tue 11/1117:58STL - SYD

2 stops25h 32mFiji Airways

Tue 25/1114:10SYD - STL

2 stops22h 20mFiji Airways

Deal found 17/9$1,716

Wed 29/1006:39STL - SYD

1 stop34h 21mQantas Airways

Thu 13/1117:50SYD - STL

2 stops42h 40mQantas Airways

Deal found 17/9$1,760

Wed 29/1006:39STL - SYD

1 stop34h 21mQantas Airways

Sat 15/1119:15SYD - STL

2 stops38h 53mQantas Airways

Deal found 16/9$1,761

Wed 22/1006:00ORD - SYD

2 stops33h 30mMultiple Airlines

Fri 24/1018:45SYD - ORD

1 stop21h 14mMultiple Airlines

Deal found 17/9$1,764

Sat 1/1106:30ORD - SYD

2 stops47h 20mMultiple Airlines

Sat 8/1106:00SYD - ORD

2 stops34h 00mMultiple Airlines

Deal found 17/9$1,773

Fri 31/1010:00ORD - SYD

2 stops28h 10mMultiple Airlines

Fri 7/1117:45SYD - ORD

1 stop22h 15mMultiple Airlines

Deal found 16/9$1,791

Sat 29/1116:25ORD - SYD

1 stop34h 50mANA

Tue 10/221:45SYD - ORD

1 stop26h 35mANA

Deal found 17/9$1,793

Mon 27/1016:44ORD - SYD

3 stops28h 01mMultiple Airlines

Sun 9/1114:00SYD - ORD

3 stops33h 25mMultiple Airlines

Deal found 16/9$1,802

Tue 28/1010:00ORD - SYD

2 stops28h 10mMultiple Airlines

Sat 8/1117:45SYD - ORD

1 stop22h 15mMultiple Airlines

Deal found 16/9$1,806

Wed 12/1110:00ORD - SYD

2 stops28h 25mMultiple Airlines

Mon 17/1117:45SYD - ORD

1 stop22h 15mMultiple Airlines

Deal found 18/9$1,812

Best flights from Illinois to Sydney
Discover carefully curated flight deals from Illinois to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 September 2025.

Wed 5/1115:59STL - SYD

2 stops46h 36mQantas Airways

Sun 23/1111:20SYD - STL

1 stop29h 22mQantas Airways

Deal found 18/9$1,511

Mon 29/906:00PIA - SYD

2 stops34h 00mUnited Airlines

Sat 4/1010:20SYD - PIA

2 stops26h 07mUnited Airlines

Deal found 16/9$1,697

Wed 12/1110:00ORD - SYD

2 stops28h 25mMultiple Airlines

Mon 17/1117:45SYD - ORD

1 stop22h 15mMultiple Airlines

Deal found 18/9$1,812

Wed 5/1114:29STL - SYD

2 stops25h 01mDelta

Sun 23/1110:40SYD - STL

2 stops27h 06mDelta

Deal found 17/9$1,946

Mon 24/1113:00ORD - SYD

2 stops28h 30mAir New Zealand

Sun 7/1209:55SYD - ORD

2 stops26h 51mAir New Zealand

Deal found 17/9$1,965

Fri 31/1011:16PIA - SYD

1 stop27h 39mAmerican Airlines

Fri 7/1114:05SYD - PIA

1 stop26h 01mAmerican Airlines

Deal found 15/9$2,019

Mon 1/1215:00ORD - SYD

2 stops28h 30mFiji Airways

Wed 31/1214:00SYD - ORD

2 stops24h 09mFiji Airways

Deal found 17/9$2,310

Wed 29/1006:39STL - SYD

1 stop34h 21mQantas Airways

Sat 15/1119:15SYD - STL

2 stops38h 53mQantas Airways

Deal found 16/9$1,761

Fri 31/1017:18PIA - SYD

2 stops23h 47mUnited Airlines

Fri 7/1111:50SYD - PIA

2 stops26h 06mUnited Airlines

Deal found 15/9$1,851

Tue 28/1018:16ORD - SYD

2 stops26h 29mMultiple Airlines

Tue 11/1114:10SYD - ORD

2 stops22h 30mMultiple Airlines

Deal found 17/9$1,878

Mon 20/1016:40ORD - SYD

2 stops24h 05mAir New Zealand

Wed 29/1013:55SYD - ORD

2 stops22h 30mAir New Zealand

Deal found 18/9$1,965

Tue 16/1207:00EVV - SYD

2 stops54h 50mJapan Airlines

Tue 3/209:15SYD - EVV

2 stops45h 19mJapan Airlines

Deal found 17/9$3,956

Sun 30/1107:05STL - SYD

2 stops32h 25mDelta

Thu 11/1210:40SYD - STL

2 stops24h 17mDelta

Deal found 17/9$1,991

Sun 2/1110:30PIA - SYD

2 stops27h 55mAmerican Airlines

Sun 9/1114:05SYD - PIA

1 stop25h 39mAmerican Airlines

Deal found 18/9$2,027

Sun 2/1115:30PIA - SYD

2 stops24h 35mUnited Airlines

Sun 9/1112:10SYD - PIA

2 stops39h 06mUnited Airlines

Deal found 18/9$1,853

Wed 29/1006:39STL - SYD

2 stops38h 06mMultiple Airlines

Thu 13/1114:00SYD - STL

2 stops25h 29mMultiple Airlines

Deal found 17/9$1,902

Sat 29/1106:00STL - SYD

2 stops33h 30mDelta

Wed 17/1210:40SYD - STL

2 stops22h 42mDelta

Deal found 17/9$1,991

Fri 28/1117:50STL - SYD

2 stops24h 05mQantas Airways

Sun 14/1214:05SYD - STL

1 stop20h 00mQantas Airways

Deal found 16/9$2,025

Tue 16/1213:15PIA - SYD

2 stops27h 00mUnited Airlines

Thu 8/111:20SYD - PIA

2 stops39h 50mUnited Airlines

Deal found 17/9$1,877

Wed 29/1006:39STL - SYD

2 stops38h 06mMultiple Airlines

Sat 15/1114:30SYD - STL

2 stops22h 00mMultiple Airlines

Deal found 17/9$1,970

Wed 8/1019:01ORD - SYD

2 stops25h 44mFiji Airways

Mon 13/1016:40SYD - ORD

2 stops44h 34mFiji Airways

Deal found 18/9$2,433

Fri 28/1117:50STL - SYD

2 stops35h 35mQantas Airways

Tue 16/1209:10SYD - STL

2 stops31h 47mQantas Airways

Deal found 17/9$2,027

Wed 5/1116:35STL - SYD

1 stop21h 25mUnited Airlines

Sun 23/1111:50SYD - STL

1 stop23h 57mUnited Airlines

Deal found 18/9$1,938

Mon 10/1112:47MDW - SYD

2 stops26h 43mDelta

Sun 23/1110:40SYD - MDW

2 stops22h 58mDelta

Deal found 17/9$2,200

Wed 5/1117:44ORD - SYD

2 stops25h 46mMultiple Airlines

Mon 10/1106:00SYD - ORD

2 stops32h 24mMultiple Airlines

Deal found 16/9$2,124

Mon 8/1210:49MDW - SYD

2 stops28h 41mDelta

Sun 21/1210:40SYD - MDW

2 stops23h 39mDelta

Deal found 17/9$2,200

Thu 13/1113:20PIA - SYD

2 stops24h 40mUnited Airlines

Mon 17/1112:10SYD - PIA

2 stops26h 21mUnited Airlines

Deal found 15/9$2,055

Tue 4/1113:49ORD - SYD

1 stop26h 11mQantas Airways

Fri 14/1111:20SYD - ORD

1 stop22h 32mQantas Airways

Deal found 17/9$2,359

Sun 9/1113:14MDW - SYD

2 stops26h 16mDelta

Tue 25/1110:40SYD - MDW

2 stops24h 28mDelta

Deal found 17/9$2,200

Tue 14/1008:39PIA - SYD

2 stops31h 21mUnited Airlines

Tue 21/1010:30SYD - PIA

2 stops26h 57mUnited Airlines

Deal found 16/9$2,096

Last-minute flights from Illinois to Sydney
Discover last-minute flight deals from Illinois to Sydney. Data last updated 18 September 2025 and is based on user searches.

Mon 29/906:00PIA - SYD

2 stops34h 00mUnited Airlines

Sat 4/1010:20SYD - PIA

2 stops26h 07mUnited Airlines

Deal found 16/9$1,697

Wed 1/1006:15STL - SYD

2 stops33h 45mUnited Airlines

Mon 13/1011:20SYD - STL

2 stops21h 12mUnited Airlines

Deal found 17/9$1,944

Thu 16/1015:57STL - SYD

2 stops35h 48mAlaska Airlines

Thu 23/1021:40SYD - STL

2 stops33h 21mAlaska Airlines

Deal found 16/9$1,871

Wed 29/1006:39STL - SYD

1 stop34h 21mQantas Airways

Sat 15/1119:15SYD - STL

2 stops34h 24mQantas Airways

Deal found 17/9$1,760

Wed 29/1006:39STL - SYD

2 stops38h 06mMultiple Airlines

Thu 13/1114:00SYD - STL

2 stops25h 29mMultiple Airlines

Deal found 17/9$1,902

Wed 29/1016:05STL - SYD

2 stops48h 30mAir Canada

Sat 15/1111:20SYD - STL

2 stops45h 09mAir Canada

Deal found 16/9$1,967

Wed 29/1006:39STL - SYD

2 stops38h 06mMultiple Airlines

Sat 15/1114:30SYD - STL

2 stops22h 00mMultiple Airlines

Deal found 17/9$1,970

Wed 29/1016:55STL - SYD

2 stops47h 40mAir Canada

Thu 13/1111:20SYD - STL

2 stops27h 34mAir Canada

Deal found 17/9$1,995

Fri 31/1017:18PIA - SYD

2 stops23h 47mUnited Airlines

Fri 7/1111:50SYD - PIA

2 stops26h 06mUnited Airlines

Deal found 15/9$1,851

Fri 31/1016:05STL - SYD

2 stops48h 30mAir Canada

Fri 7/1111:20SYD - STL

2 stops45h 09mAir Canada

Deal found 16/9$1,917

Fri 31/1006:39STL - SYD

1 stop34h 21mMultiple Airlines

Fri 7/1111:20SYD - STL

2 stops45h 09mMultiple Airlines

Deal found 16/9$1,940

Fri 31/1017:00STL - SYD

1 stop21h 55mAmerican Airlines

Fri 7/1111:20SYD - STL

2 stops22h 07mAmerican Airlines

Deal found 16/9$2,006

One-way flights from Illinois to Sydney
Search for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated 18 September 2025.

Sun 9/1106:00ORD - SYD

3 stops58h 50mMultiple Airlines

Deal found 17/9$799

Mon 10/1106:00ORD - SYD

3 stops32h 25mMultiple Airlines

Deal found 17/9$818

Wed 12/1115:25ORD - SYD

2 stops49h 25mMultiple Airlines

Deal found 17/9$823

Thu 6/1106:00ORD - SYD

3 stops55h 10mMultiple Airlines

Deal found 17/9$829

Sun 19/1006:00ORD - SYD

2 stops34h 05mMultiple Airlines

Deal found 17/9$833

Sat 8/1108:00ORD - SYD

2 stops54h 25mMultiple Airlines

Deal found 17/9$853

Thu 25/906:20MDW - SYD

2 stops33h 35mMultiple Airlines

Deal found 16/9$860

Tue 18/1107:00STL - SYD

2 stops30h 10mMultiple Airlines

Deal found 17/9$866

Sun 16/1116:14STL - SYD

2 stops48h 36mMultiple Airlines

Deal found 17/9$871

Wed 19/1107:00STL - SYD

2 stops31h 25mMultiple Airlines

Deal found 17/9$874

Thu 13/1110:00ORD - SYD

2 stops28h 25mMultiple Airlines

Deal found 17/9$881

Mon 17/1119:45STL - SYD

3 stops46h 00mMultiple Airlines

Deal found 17/9$886

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

15:59-07:35

2 stops46h 36m

Sydney Kingsford Smith

Sun 23/11

11:20-23:42

1 stop29h 22m

$1,511

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Mon 29/9

06:00-07:00

2 stops34h 00m

Sydney Kingsford Smith

Sat 4/10

10:20-21:27

2 stops26h 07m

$1,697

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

06:39-09:00

1 stop34h 21m

Sydney Kingsford Smith

Sat 15/11

19:15-17:08

2 stops38h 53m

$1,761

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 12/11

10:00-07:25

2 stops28h 25m

Sydney Kingsford Smith

Mon 17/11

17:45-23:00

1 stop22h 15m

$1,812

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Fri 31/10

17:18-09:05

2 stops23h 47m

Sydney Kingsford Smith

Fri 7/11

11:50-20:56

2 stops26h 06m

$1,851

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Sun 2/11

15:30-09:05

2 stops24h 35m

Sydney Kingsford Smith

Sun 9/11

12:10-10:16

2 stops39h 06m

$1,853

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Tue 16/12

13:15-09:15

2 stops27h 00m

Sydney Kingsford Smith

Thu 8/1

11:20-10:10

2 stops39h 50m

$1,877

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 28/10

18:16-12:45

2 stops26h 29m

Sydney Kingsford Smith

Tue 11/11

14:10-19:40

2 stops22h 30m

$1,878

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

06:39-12:45

2 stops38h 06m

Sydney Kingsford Smith

Thu 13/11

14:00-22:29

2 stops25h 29m

$1,902

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

16:35-07:00

1 stop21h 25m

Sydney Kingsford Smith

Sun 23/11

11:50-18:47

1 stop23h 57m

$1,938

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Illinois with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Sydney

What is the cheapest month to book a flight from Illinois to Sydney?

Currently, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to SYD?

When flying from Illinois to Sydney, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from Illinois to Sydney?

Related info for your journey

What airport do you fly into for flights to Sydney from Illinois?
Located just 7.5 km from the city centre, Sydney Kingsford Smith (SYD) is the airport most travelers will use when flying to Sydney from Illinois.
How long is the flight from Illinois to Sydney?
A quick flight from Illinois to Sydney can take about 25h 01m. Qantas Airways provides one of the quickest options available for as low as $1,946. The distance between Illinois and Sydney is about 14571 km. Both multi-stop and direct flights can be found to your destination and back.
What are the most popular routes from Illinois to Sydney?
When deciding which route to take from Illinois to Sydney, consider Chicago O'Hare Intl - Sydney Kingsford Smith, Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, as they are the most popular.
Can I find deals for flights from Illinois to Sydney that include hotel bookings?
Yes. In addition to deals on Illinois to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Illinois to Sydney?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Sydney.
Can I find deals for business class flights from Illinois to Sydney?
Yes. Cheapflights offers flight deals from Illinois to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Illinois to Sydney?
Currently, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Parramatta

Wollongong

Katoomba

Penrith

Manly

Terrigal

Lithgow

Randwick

Bondi Beach

Coogee

Cronulla

Leura

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Illinois to Sydney

Los Angeles to Sydney flights

San Francisco to Sydney flights

Dallas/Fort Worth to Sydney flights

John F Kennedy Intl to Sydney flights

Newark to Sydney flights

Seattle to Sydney flights

Hobby to Sydney flights

George Bush Intcntl to Sydney flights

Dulles Intl to Sydney flights

O'Hare Intl to Sydney flights

Boston to Sydney flights

Baltimore to Sydney flights

Reagan-National to Sydney flights

Honolulu to Sydney flights

San Jose to Sydney flights

Atlanta to Sydney flights

Midway to Sydney flights

Detroit to Sydney flights

Minneapolis to Sydney flights

Sky Harbor Intl to Sydney flights

Denver to Sydney flights

Oakland to Sydney flights

Miami to Sydney flights

Portland to Sydney flights

San Diego to Sydney flights

Orlando to Sydney flights

Philadelphia to Sydney flights

Salt Lake City to Sydney flights

Tampa to Sydney flights

Austin to Sydney flights

Raleigh to Sydney flights

Indianapolis to Sydney flights

Charlotte to Sydney flights

Sacramento to Sydney flights

Love Field to Sydney flights

Nashville to Sydney flights

Columbus to Sydney flights

San Antonio to Sydney flights

Cincinnati to Sydney flights

St. Louis to Sydney flights

Fort Lauderdale to Sydney flights

Cleveland to Sydney flights

Milwaukee to Sydney flights

Las Vegas to Sydney flights

Direct flights to New South Wales

Other flights to Sydney

Sydney to Ballina flights

Sydney to Melbourne Avalon Airport flights

Sydney to Maroochydore flights

Sydney to Coolangatta flights

Sydney to Launceston flights

Sydney to Hervey Bay flights

Sydney to Brisbane flights

Sydney to Toowoomba flights

Sydney to Hobart flights

Sydney to Melbourne Avalon Airport flights

Sydney to Ballina flights

Sydney to Melbourne Airport flights

Sydney to Cairns flights

Sydney to Adelaide flights

Sydney to Coolangatta flights

Sydney to Maroochydore flights

Sydney to Adelaide flights

Sydney to Townsville flights

Top 2 airlines flying from Illinois to Sydney

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$1,246	Average$1,762	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Qantas Airways	Cheapest$1,310	Average$1,408	FlexibilityNo cancel fee	On-time74%	Search Qantas Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from Illinois to Sydney?

When you search for this flight from Illinois to Sydney, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Illinois to Sydney with no change fees?

Yes! Cheapflights helps users easily find flights from Illinois to Sydney with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Sydney become cheaper?

Of course! You can now track prices for flights from Illinois to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Illinois to Sydney from $799

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Sydney

Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated 18 September 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Illinois to Sydney

Cheapest flights from Illinois to SydneyExplore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Best time to book a flight from Illinois to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Illinois with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Sydney

What is the cheapest month to book a flight from Illinois to Sydney?

What is the cheapest time of day to fly from IL to SYD?

Find hourly flight availability from Illinois to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 September 2025.

How much does it cost for a return flight from Illinois to Sydney?

Related info for your journey

Find useful and relevant information for your journey from Illinois to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Sydney from Illinois?

How long is the flight from Illinois to Sydney?

What are the most popular routes from Illinois to Sydney?

Can I find deals for flights from Illinois to Sydney that include hotel bookings?

How can I find direct flights from Illinois to Sydney?

Can I find deals for business class flights from Illinois to Sydney?

What is the cheapest month to book a flight from Illinois to Sydney?

Travelling to a place near Sydney?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Sydney

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Illinois to Sydney

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Illinois to Sydney?

Why should you use Cheapflights to find cheap flight tickets from Illinois to Sydney?

Can Cheapflights find flights from Illinois to Sydney with no change fees?

Can Cheapflights notify me if prices for flights from Illinois to Sydney become cheaper?

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Illinois to Sydney
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.