How long is the flight from Illinois to Sydney?

A quick flight from Illinois to Sydney can take about 23h 18m. Air New Zealand provides one of the quickest options available for as low as $1,817. The distance between Illinois and Sydney is about 14571 km. Both multi-stop and direct flights can be found to your destination and back.

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.

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 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.

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.

$797+ Cheap Flights from Illinois to Sydney

Cheap flight deals from Illinois to Sydney

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 August 2026.

Mon 14/906:30 -

2 stops33h 35m

Wed 23/917:50 -

2 stops26h 48m

Deal found 13/8$1,719

Sun 16/813:36 -

2 stops26h 24m

Sun 30/810:20 -

2 stops21h 14m

Deal found 14/8$1,728

Wed 21/1014:00 -

2 stops26h 45m

Mon 9/1114:05 -

2 stops25h 54m

Deal found 14/8$1,737

Sun 16/815:32 -

2 stops24h 28m

Sun 23/810:20 -

1 stop22h 39m

Deal found 15/8$1,741

Sun 27/906:30 -

3 stops48h 55m

Sun 4/1015:25 -

3 stops48h 58m

Deal found 13/8$1,743

Mon 19/1006:30 -

2 stops33h 00m

Mon 26/1011:10 -

2 stops29h 14m

Deal found 16/8$1,744

Wed 16/906:30 -

2 stops33h 35m

Wed 14/1010:10 -

2 stops30h 14m

Deal found 16/8$1,748

Sun 1/1114:00 -

2 stops27h 35m

Sun 15/1119:25 -

2 stops42h 12m

Deal found 16/8$1,750

Wed 16/906:25 -

2 stops33h 40m

Wed 14/1010:10 -

2 stops29h 33m

Deal found 16/8$1,751

Wed 16/906:30 -

2 stops33h 35m

Wed 23/909:10 -

2 stops39h 10m

Deal found 15/8$1,752

Sun 30/815:40 -

1 stop24h 40m

Tue 15/909:20 -

1 stop20h 23m

Deal found 17/8$1,755

Sun 16/806:00 -

1 stop34h 05m

Sun 30/809:10 -

1 stop28h 49m

Deal found 14/8$1,765

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 August 2026.

Mon 8/216:17 -

2 stops23h 18m

Sat 13/219:25 -

2 stops43h 41m

Deal found 13/8$1,817

Sat 14/1119:05 -

2 stops45h 35m

Wed 18/1109:15 -

2 stops30h 09m

Deal found 16/8$1,863

Mon 8/216:30 -

2 stops24h 05m

Sat 13/211:20 -

3 stops44h 10m

Deal found 13/8$1,977

Mon 8/216:05 -

1 stop48h 30m

Sat 13/211:20 -

1 stop45h 06m

Deal found 13/8$2,072

Mon 7/909:59 -

2 stops29h 51m

Wed 30/909:15 -

2 stops24h 04m

Deal found 14/8$2,253

Wed 11/1116:43 -

1 stop21h 12m

Sun 15/1120:45 -

2 stops36h 03m

Deal found 16/8$2,382

Thu 24/1207:00 -

3 stops30h 25m

Thu 7/111:15 -

3 stops29h 44m

Deal found 16/8$3,173

Fri 18/908:48 -

2 stops54h 42m

Tue 22/914:50 -

2 stops48h 08m

Deal found 17/8$3,201

Wed 16/908:48 -

2 stops30h 32m

Sun 20/908:55 -

2 stops46h 28m

Deal found 13/8$3,499

Mon 21/1222:45 -

1 stop42h 05m

Sun 3/111:30 -

1 stop46h 25m

Deal found 17/8$3,737

Wed 23/915:32 -

2 stops24h 28m

Wed 7/1011:20 -

1 stop23h 23m

Deal found 15/8$1,875

Fri 11/915:13 -

2 stops26h 32m

Sat 10/1011:55 -

3 stops27h 49m

Deal found 18/8$2,083

Thu 1/1008:30 -

2 stops31h 25m

Thu 8/1011:20 -

2 stops23h 41m

Deal found 17/8$1,987

Wed 7/1008:29 -

2 stops31h 21m

Wed 14/1010:15 -

2 stops26h 23m

Deal found 15/8$2,269

Tue 1/918:54 -

2 stops32h 56m

Tue 8/920:45 -

3 stops24h 35m

Deal found 13/8$2,091

Fri 2/1016:39 -

2 stops23h 21m

Fri 9/1010:30 -

2 stops24h 13m

Deal found 18/8$2,010

Wed 4/1113:27 -

2 stops26h 03m

Thu 19/1110:40 -

2 stops24h 24m

Deal found 18/8$2,269

Sat 12/919:00 -

2 stops56h 50m

Sat 3/1020:45 -

2 stops42h 14m

Deal found 14/8$2,243

Wed 30/918:59 -

1 stop20h 51m

Wed 7/1010:15 -

2 stops26h 23m

Deal found 16/8$2,273

Sun 22/1119:05 -

1 stop21h 15m

Sun 29/1109:15 -

2 stops43h 55m

Deal found 17/8$2,150

Mon 28/913:00 -

2 stops26h 50m

Mon 5/1010:15 -

2 stops24h 04m

Deal found 14/8$2,273

Tue 1/1214:10 -

1 stop25h 55m

Thu 31/1213:20 -

1 stop24h 13m

Deal found 17/8$2,261

Mon 14/909:59 -

2 stops29h 51m

Sun 20/909:15 -

2 stops24h 04m

Deal found 16/8$2,273

Wed 10/208:33 -

3 stops31h 02m

Tue 16/209:55 -

3 stops30h 14m

Deal found 15/8$2,526

Wed 3/208:00 -

3 stops29h 25m

Sun 21/211:15 -

3 stops29h 44m

Deal found 13/8$3,450

Wed 30/910:48 -

2 stops29h 02m

Wed 7/1010:15 -

2 stops23h 45m

Deal found 16/8$2,273

Wed 11/1110:43 -

2 stops29h 37m

Sun 15/1111:50 -

2 stops26h 16m

Deal found 17/8$2,412

Tue 1/910:54 -

2 stops28h 56m

Tue 8/909:15 -

2 stops24h 04m

Deal found 14/8$2,273

Wed 16/913:19 -

2 stops26h 31m

Wed 23/909:15 -

2 stops24h 18m

Deal found 15/8$2,273

Sun 30/813:51 -

2 stops25h 59m

Tue 15/909:15 -

2 stops24h 04m

Deal found 17/8$2,273

Find flight deals from Illinois to Sydney

Round-trip from	$1,719
One-way from	$797
Popular in	September
Cheapest in	February
Average price	$2,060

14/9-23/9
4 total stops
60h 23m total
Illinois to Sydney

Search Deals

17/11
2 total stops
30h 25m total
Illinois to Sydney

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($172 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease ($28 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/2

16:17-08:35

2 stops23h 18m

Sydney Kingsford Smith

Sat 13/2

19:25-22:06

2 stops43h 41m

$1,817

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 14/11

19:05-09:40

2 stops45h 35m

Sydney Kingsford Smith

Wed 18/11

09:15-22:24

2 stops30h 09m

$1,863

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

15:32-07:00

2 stops24h 28m

Sydney Kingsford Smith

Wed 7/10

11:20-18:43

1 stop23h 23m

$1,875

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/2

16:30-09:35

2 stops24h 05m

Sydney Kingsford Smith

Sat 13/2

11:20-14:30

3 stops44h 10m

$1,977

PeoriaSydney

PIA Greater Peoria - SYD Sydney Kingsford Smith

PIASYD

Greater Peoria

Thu 1/10

08:30-06:55

2 stops31h 25m

Sydney Kingsford Smith

Thu 8/10

11:20-19:01

2 stops23h 41m

$1,987

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 2/10

16:39-07:00

2 stops23h 21m

Sydney Kingsford Smith

Fri 9/10

10:30-18:43

2 stops24h 13m

$2,010

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/2

16:05-09:35

1 stop48h 30m

Sydney Kingsford Smith

Sat 13/2

11:20-15:26

1 stop45h 06m

$2,072

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 11/9

15:13-08:45

2 stops26h 32m

Sydney Kingsford Smith

Sat 10/10

11:55-23:44

3 stops27h 49m

$2,083

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 1/9

18:54-18:50

2 stops32h 56m

Sydney Kingsford Smith

Tue 8/9

20:45-06:20

3 stops24h 35m

$2,091

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 22/11

19:05-09:20

1 stop21h 15m

Sydney Kingsford Smith

Sun 29/11

09:15-12:10

2 stops43h 55m

$2,150

Flights are sorted by cheapest return flights first.

Deals found on 16/8

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

ORD-SYD

MDW-SYD

STL-SYD

PIA-SYD

EVV-SYD

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

USIL-SYD

ORD-SYD

MDW-SYD

STL-SYD

PIA-SYD

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

Currently, June is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,806). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,470). 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.

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

Airfare is below average for this route at the moment.

Illinois to Sydney flights typically cost between $1,771 and $2,201 in September.
The cheapest return price found within the last 5 days was $1,719 on Multiple Airlines (14 Sept–23 Sept).

How far ahead should I book a flight from Illinois to Sydney?

The price you pay for your flight from Illinois to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 82 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 23h 18m. Air New Zealand provides one of the quickest options available for as low as $1,817. 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, June is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,806). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,470). 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 airline flying from Illinois to Sydney

Airline	Cheapest	Average	Flexibility	On-time
Qantas Airways	Cheapest$2,067	Average$2,288	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 $797

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 17/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Sydney

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 August 2026.

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 August 2026.

Best flights from Illinois to SydneyDiscover 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 August 2026.

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 August 2026.

Last-minute flights from Illinois to SydneyDiscover last-minute flight deals from Illinois to Sydney. Data last updated 18 August 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Sydney. Data last updated 18 August 2026 and is based on user searches.

One-way flights from Illinois to SydneySearch for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated 18 August 2026.

Search for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated 18 August 2026.

Find flight deals from Illinois to Sydney

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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

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

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

Airfare is below average for this route at the moment.

Illinois to Sydney flights typically cost between $1,771 and $2,201 in September.The cheapest return price found within the last 5 days was $1,719 on Multiple Airlines (14 Sept–23 Sept).

How far ahead should I book a flight from Illinois to Sydney?

The price you pay for your flight from Illinois to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 82 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Related info for your journey

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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Search flights from Illinois to Sydney by cabin class

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Browse other Illinois and Sydney flight options. Last updated on 18 August 2026.

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Top airline 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 18 August 2026.

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 August 2026.

Last-minute flights from Illinois to Sydney
Discover last-minute flight deals from Illinois to Sydney. Data last updated 18 August 2026 and is based on user searches.

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 August 2026.

Illinois to Sydney flights typically cost between $1,771 and $2,201 in September.
The cheapest return price found within the last 5 days was $1,719 on Multiple Airlines (14 Sept–23 Sept).