How long is the flight from Illinois to Sydney?

A quick flight from Illinois to Sydney can take about 24h 40m. Qantas Airways provides one of the quickest options available for as low as $1,862. The distance between Illinois and Sydney is about 14676 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 is the cheapest month to fly from Illinois to Sydney?

The best pricing can be found in the month of August. Prices to Sydney from Illinois average $1,494. You can even find prices in August for less than $1,494, as users have found deals to Sydney from as low as $1,120. The month of December appears to be one of the more expensive times to travel to Sydney from Illinois. Flying in the targeted month can save you up to 45%.

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.

$701+ 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 $1,440 and $2,384 in February. The cheapest return flight price found within the last 3 days was $1,534 on Alaska Airlines (17 Feb-3 Mar). Find deals

Cheap flight deals from Illinois to Sydney

Round-trip from	$1,534
One-way from	$701
Popular in	December
Cheapest in	August
Average price	$1,733

Alaska Airlines
17/2-3/3
3 total stops
56h 19m total
Illinois to Sydney

Search Deals

21/1
2 total stops
30h 40m total
Illinois to Sydney

Search Deals

Highest demand for flights based on searches. 15% potential increase in price ($428 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($96 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 12 September 2025.

Mon 20/1009:44MDW - SYD

2 stops30h 21mMultiple Airlines

Sun 2/1114:05SYD - MDW

2 stops24h 58mMultiple Airlines

Deal found 10/9$1,553

Mon 27/1012:03MDW - SYD

2 stops28h 57mMultiple Airlines

Sun 9/1114:05SYD - MDW

2 stops24h 58mMultiple Airlines

Deal found 11/9$1,555

Fri 24/1015:15ORD - SYD

2 stops36h 30mAlaska Airlines

Fri 31/1021:40SYD - ORD

2 stops24h 42mAlaska Airlines

Deal found 10/9$1,627

Tue 4/1115:25ORD - SYD

2 stops35h 20mAlaska Airlines

Tue 18/1121:40SYD - ORD

1 stop35h 50mAlaska Airlines

Deal found 9/9$1,644

Mon 20/1012:28ORD - SYD

2 stops27h 37mMultiple Airlines

Sun 2/1114:05SYD - ORD

2 stops27h 06mMultiple Airlines

Deal found 10/9$1,663

Fri 7/1107:00STL - SYD

2 stops33h 50mQantas Airways

Sun 16/1114:05SYD - STL

1 stop20h 03mQantas Airways

Deal found 11/9$1,663

Mon 10/1106:30ORD - SYD

2 stops37h 00mMultiple Airlines

Thu 13/1114:00SYD - ORD

2 stops26h 00mMultiple Airlines

Deal found 10/9$1,666

Fri 28/1117:50STL - SYD

2 stops35h 05mQantas Airways

Sun 14/1214:05SYD - STL

1 stop20h 00mQantas Airways

Deal found 10/9$1,669

Thu 6/1117:53ORD - SYD

2 stops32h 52mAlaska Airlines

Sat 22/1121:40SYD - ORD

2 stops34h 13mAlaska Airlines

Deal found 10/9$1,689

Tue 21/1006:00ORD - SYD

2 stops32h 05mMultiple Airlines

Sat 15/1117:45SYD - ORD

1 stop22h 15mMultiple Airlines

Deal found 11/9$1,713

Thu 6/1118:13STL - SYD

2 stops35h 12mQantas Airways

Mon 17/1114:05SYD - STL

1 stop39h 32mQantas Airways

Deal found 11/9$1,719

Sat 18/1006:00ORD - SYD

2 stops33h 30mMultiple Airlines

Fri 14/1117:45SYD - ORD

1 stop22h 15mMultiple Airlines

Deal found 11/9$1,737

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 12 September 2025.

Mon 27/1012:03MDW - SYD

2 stops28h 57mMultiple Airlines

Sun 9/1114:05SYD - MDW

2 stops24h 58mMultiple Airlines

Deal found 11/9$1,555

Fri 7/1107:00STL - SYD

2 stops33h 50mQantas Airways

Sun 16/1114:05SYD - STL

1 stop20h 03mQantas Airways

Deal found 11/9$1,663

Tue 21/1017:59ORD - SYD

2 stops33h 46mAlaska Airlines

Tue 28/1021:40SYD - ORD

2 stops34h 50mAlaska Airlines

Deal found 10/9$1,773

Sun 26/1016:05STL - SYD

2 stops48h 30mAir Canada

Sun 2/1111:20SYD - STL

2 stops45h 09mAir Canada

Deal found 11/9$1,820

Wed 12/1113:20PIA - SYD

2 stops24h 40mUnited Airlines

Mon 1/1211:50SYD - PIA

2 stops41h 09mUnited Airlines

Deal found 11/9$1,862

Tue 23/918:30ORD - SYD

2 stops36h 40mFiji Airways

Tue 24/206:00SYD - ORD

2 stops34h 57mFiji Airways

Deal found 11/9$1,926

Fri 28/1107:00STL - SYD

1 stop31h 25mAmerican Airlines

Sun 14/1217:45SYD - STL

1 stop23h 12mAmerican Airlines

Deal found 10/9$2,030

Mon 1/1211:50ORD - SYD

2 stops38h 30mTurkish Airlines

Thu 11/1221:15SYD - ORD

2 stops38h 10mTurkish Airlines

Deal found 11/9$2,117

Wed 4/315:55ORD - SYD

1 stop24h 20mAir New Zealand

Sat 14/319:15SYD - ORD

2 stops41h 56mAir New Zealand

Deal found 11/9$2,126

Tue 4/1109:20MDW - SYD

2 stops30h 10mDelta

Tue 18/1110:40SYD - MDW

2 stops22h 58mDelta

Deal found 9/9$2,211

Fri 28/1117:50STL - SYD

2 stops35h 35mQantas Airways

Sun 14/1214:05SYD - STL

1 stop22h 22mQantas Airways

Deal found 11/9$1,671

Fri 14/1115:25ORD - SYD

2 stops35h 20mAlaska Airlines

Sat 22/1121:40SYD - ORD

2 stops34h 13mAlaska Airlines

Deal found 10/9$1,775

Last-minute flights from Illinois to Sydney
Discover last-minute flight deals from Illinois to Sydney. Data last updated 12 September 2025 and is based on user searches.

Sun 14/912:22STL - SYD

1 stop27h 33mAmerican Airlines

Sat 27/909:10SYD - STL

1 stop28h 49mAmerican Airlines

Deal found 10/9$2,030

Sun 21/906:30MDW - SYD

2 stops33h 35mMultiple Airlines

Sun 28/909:10SYD - MDW

2 stops37h 13mMultiple Airlines

Deal found 10/9$1,898

Sun 21/906:30ORD - SYD

1 stop33h 35mMultiple Airlines

Sun 28/917:45SYD - ORD

2 stops33h 13mMultiple Airlines

Deal found 10/9$1,945

Sun 21/906:00ORD - SYD

2 stops35h 45mAir New Zealand

Sun 28/907:45SYD - ORD

2 stops28h 39mAir New Zealand

Deal found 10/9$2,787

Sat 27/915:59STL - SYD

1 stop23h 56mQantas Airways

Sat 4/1017:45SYD - STL

1 stop20h 14mQantas Airways

Deal found 11/9$1,978

Sat 11/1017:09STL - SYD

2 stops27h 36mFiji Airways

Sat 18/1014:45SYD - STL

2 stops22h 08mFiji Airways

Deal found 11/9$2,134

Sun 26/1016:05STL - SYD

2 stops48h 30mAir Canada

Sun 2/1111:20SYD - STL

2 stops45h 09mAir Canada

Deal found 11/9$1,820

Sun 26/1014:15STL - SYD

2 stops26h 45mAmerican Airlines

Sun 2/1114:05SYD - STL

1 stop20h 03mAmerican Airlines

Deal found 11/9$2,036

Mon 27/1016:05STL - SYD

2 stops48h 30mAir Canada

Mon 3/1111:20SYD - STL

2 stops45h 09mAir Canada

Deal found 11/9$1,823

Mon 27/1017:02STL - SYD

1 stop21h 53mAmerican Airlines

Mon 3/1111:20SYD - STL

1 stop29h 22mAmerican Airlines

Deal found 11/9$2,031

Wed 29/1006:39STL - SYD

1 stop34h 21mQantas Airways

Sat 15/1119:15SYD - STL

2 stops38h 53mQantas Airways

Deal found 11/9$1,758

Wed 29/1013:35STL - SYD

3 stops28h 55mMultiple Airlines

Sat 15/1113:55SYD - STL

3 stops24h 54mMultiple Airlines

Deal found 11/9$2,144

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 12 September 2025.

Wed 21/107:45ORD - SYD

2 stops30h 40mMultiple Airlines

Deal found 11/9$701

Tue 10/218:50ORD - SYD

2 stops43h 35mMultiple Airlines

Deal found 11/9$778

Mon 23/218:50ORD - SYD

2 stops43h 35mMultiple Airlines

Deal found 10/9$789

Sun 23/1108:00ORD - SYD

2 stops32h 00mMultiple Airlines

Deal found 11/9$802

Tue 23/915:35STL - SYD

2 stops32h 05mMultiple Airlines

Deal found 10/9$864

Mon 6/1006:00ORD - SYD

2 stops56h 05mMultiple Airlines

Deal found 11/9$870

Fri 5/1207:00STL - SYD

2 stops31h 25mMultiple Airlines

Deal found 11/9$878

Sat 14/216:45ORD - SYD

2 stops26h 45mFiji Airways

Deal found 10/9$917

Fri 7/1118:03ORD - SYD

2 stops32h 52mMultiple Airlines

Deal found 10/9$936

Wed 11/214:05ORD - SYD

3 stops48h 20mMultiple Airlines

Deal found 11/9$950

Sat 14/214:59ORD - SYD

3 stops46h 11mMultiple Airlines

Deal found 10/9$992

Tue 30/906:00STL - SYD

3 stops33h 05mMultiple Airlines

Deal found 10/9$1,031

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 27/10

12:03-09:00

2 stops28h 57m

Sydney Kingsford Smith

Sun 9/11

14:05-22:03

2 stops24h 58m

$1,555

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 7/11

07:00-09:50

2 stops33h 50m

Sydney Kingsford Smith

Sun 16/11

14:05-17:08

1 stop20h 03m

$1,663

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

17:50-22:25

2 stops35h 35m

Sydney Kingsford Smith

Sun 14/12

14:05-19:27

1 stop22h 22m

$1,671

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 21/10

17:59-19:45

2 stops33h 46m

Sydney Kingsford Smith

Tue 28/10

21:40-16:30

2 stops34h 50m

$1,773

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 14/11

15:25-19:45

2 stops35h 20m

Sydney Kingsford Smith

Sat 22/11

21:40-14:53

2 stops34h 13m

$1,775

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

07:00-19:45

2 stops43h 45m

Sydney Kingsford Smith

Sun 16/11

21:40-23:59

2 stops43h 19m

$1,778

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 4/11

07:00-19:45

2 stops43h 45m

Sydney Kingsford Smith

Sun 16/11

21:40-23:59

2 stops43h 19m

$1,778

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/11

16:14-19:45

2 stops58h 31m

Sydney Kingsford Smith

Sat 15/11

21:40-23:59

2 stops43h 19m

$1,791

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/10

16:05-08:35

2 stops48h 30m

Sydney Kingsford Smith

Sun 2/11

11:20-16:29

2 stops45h 09m

$1,820

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Wed 12/11

13:20-07:00

2 stops24h 40m

Sydney Kingsford Smith

Mon 1/12

11:50-11:59

2 stops41h 09m

$1,862

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 54 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 24h 40m. Qantas Airways provides one of the quickest options available for as low as $1,862. The distance between Illinois and Sydney is about 14676 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

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Top 2 airlines flying from Illinois to Sydney

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$1,254	Average$1,773	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Qantas Airways	Cheapest$1,318	Average$1,417	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.

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Cheap flights from Illinois to Sydney from $701

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 21/1. 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 12 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 12 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 12 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 12 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?

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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

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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?

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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 12 September 2025.