How long is the flight from Illinois to Sydney?

A quick flight from Illinois to Sydney can take about 26h 24m. American Airlines provides one of the quickest options available for as low as $1,836. The distance between Illinois and Sydney is about 14676 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.

$747+ 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 15 September 2026.

Tue 20/1011:05 -

2 stops29h 15m

Tue 27/1010:20 -

1 stop20h 17m

Deal found 13/9$1,678

Mon 16/1106:30 -

3 stops33h 05m

Thu 10/1211:50 -

3 stops40h 56m

Deal found 10/9$1,692

Fri 16/1015:40 -

1 stop24h 40m

Mon 26/1010:20 -

1 stop20h 17m

Deal found 14/9$1,717

Sat 19/906:30 -

3 stops38h 20m

Wed 30/913:15 -

3 stops31h 23m

Deal found 10/9$1,730

Sun 18/1011:05 -

2 stops29h 15m

Sun 1/1111:20 -

2 stops25h 32m

Deal found 12/9$1,731

Tue 1/1215:00 -

2 stops24h 35m

Sun 13/1209:55 -

2 stops31h 55m

Deal found 14/9$1,733

Sun 15/1114:00 -

2 stops25h 35m

Sun 13/1209:55 -

2 stops27h 38m

Deal found 10/9$1,734

Sun 15/1106:15 -

2 stops33h 20m

Thu 19/1109:55 -

2 stops29h 30m

Deal found 15/9$1,800

Mon 9/1111:00 -

2 stops28h 35m

Tue 24/1119:25 -

2 stops43h 50m

Deal found 13/9$1,828

Mon 26/1016:42 -

1 stop22h 13m

Mon 2/1114:05 -

1 stop26h 04m

Deal found 11/9$1,832

Wed 28/1017:55 -

1 stop21h 05m

Wed 4/1109:15 -

1 stop24h 35m

Deal found 12/9$1,863

Mon 9/1114:55 -

2 stops24h 40m

Wed 11/1111:50 -

3 stops28h 34m

Deal found 11/9$1,867

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 15 September 2026.

Fri 5/306:59 -

2 stops33h 51m

Tue 16/311:30 -

2 stops33h 30m

Deal found 12/9$1,752

Mon 26/1012:31 -

1 stop26h 24m

Mon 2/1111:10 -

2 stops28h 59m

Deal found 11/9$1,836

Mon 9/1111:00 -

1 stop27h 00m

Tue 24/1111:20 -

2 stops23h 45m

Deal found 13/9$1,863

Thu 10/1211:45 -

2 stops38h 40m

Thu 24/1221:35 -

2 stops53h 25m

Deal found 12/9$2,121

Sat 31/1012:35 -

1 stop26h 20m

Wed 4/1121:50 -

2 stops34h 58m

Deal found 11/9$2,204

Sun 1/1110:12 -

2 stops29h 18m

Sun 8/1110:40 -

2 stops22h 34m

Deal found 11/9$2,264

Mon 19/1006:00 -

2 stops33h 30m

Wed 28/1021:25 -

3 stops35h 25m

Deal found 11/9$2,517

Fri 6/1106:40 -

2 stops55h 10m

Tue 10/1115:50 -

2 stops49h 09m

Deal found 10/9$2,968

Sun 31/116:11 -

2 stops23h 49m

Thu 11/211:20 -

2 stops29h 02m

Deal found 14/9$1,907

Thu 29/1010:43 -

2 stops28h 17m

Thu 5/1109:20 -

2 stops24h 27m

Deal found 14/9$1,982

Fri 8/109:13 -

3 stops30h 22m

Sat 30/109:55 -

3 stops30h 29m

Deal found 11/9$2,091

Thu 29/1012:45 -

2 stops38h 40m

Thu 5/1121:35 -

2 stops54h 25m

Deal found 10/9$2,128

Thu 29/1014:55 -

1 stop24h 05m

Thu 5/1109:20 -

1 stop24h 30m

Deal found 14/9$2,003

Sun 17/109:55 -

2 stops29h 35m

Sun 31/110:40 -

2 stops28h 30m

Deal found 11/9$2,264

Mon 26/1006:14 -

3 stops44h 01m

Mon 2/1115:15 -

2 stops42h 53m

Deal found 11/9$2,114

Sun 8/1114:54 -

1 stop23h 01m

Wed 11/1109:55 -

2 stops27h 47m

Deal found 13/9$2,346

Thu 11/212:25 -

1 stop25h 30m

Thu 25/214:05 -

1 stop20h 15m

Deal found 11/9$2,182

Sat 7/1115:15 -

2 stops24h 50m

Sat 21/1109:20 -

1 stop21h 53m

Deal found 10/9$2,005

Tue 29/1213:35 -

2 stops24h 15m

Thu 21/110:40 -

1 stop23h 41m

Deal found 12/9$2,265

Thu 11/207:01 -

3 stops43h 29m

Thu 25/208:45 -

2 stops31h 37m

Deal found 11/9$2,114

Wed 3/207:40 -

3 stops29h 45m

Sun 21/211:15 -

3 stops29h 44m

Deal found 15/9$2,578

Tue 29/1211:47 -

2 stops27h 43m

Sat 23/110:40 -

2 stops28h 30m

Deal found 10/9$2,265

Fri 5/308:00 -

3 stops29h 25m

Mon 15/311:15 -

3 stops28h 44m

Deal found 14/9$2,586

Sun 31/106:50 -

3 stops30h 35m

Thu 11/211:15 -

2 stops24h 16m

Deal found 14/9$2,145

Sun 11/1008:00 -

2 stops31h 55m

Sun 18/1011:20 -

1 stop23h 23m

Deal found 13/9$2,192

Tue 1/1213:02 -

2 stops26h 28m

Sun 13/1210:40 -

2 stops29h 15m

Deal found 14/9$2,335

Sat 10/1020:30 -

2 stops44h 30m

Sat 17/1011:15 -

2 stops34h 25m

Deal found 14/9$2,177

Thu 31/1211:47 -

2 stops27h 43m

Tue 2/210:40 -

2 stops24h 57m

Deal found 14/9$2,335

Sat 31/1014:34 -

2 stops24h 26m

Wed 4/1111:50 -

2 stops28h 23m

Deal found 14/9$2,405

Fri 15/117:54 -

2 stops24h 51m

Tue 19/114:05 -

1 stop20h 17m

Deal found 11/9$2,912

Find flight deals from Illinois to Sydney

Round-trip from	$1,678
One-way from	$747
Popular in	December
Cheapest in	June
Average price	$2,202

Air Canada
20/10-27/10
3 total stops
49h 32m total
Illinois to Sydney

Search Deals

20/10-31/12
1 total stop
43h 29m total
Illinois to Sydney

Search Deals

Highest demand for flights based on searches. 3% potential increase in price ($117 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease ($29 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 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 2/11

19:59-06:25

2 stops41h 26m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$821

ChicagoSydney

MDW Chicago Midway - SYD Sydney Kingsford Smith

MDWSYD

Chicago Midway

Wed 28/10

06:16-06:25

2 stops32h 09m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$869

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 20/10

06:30-09:40

3 stops35h 10m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$919

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 10/11

06:29-09:50

2 stops34h 21m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$962

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Mon 26/10

18:55-09:50

2 stops46h 55m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$962

EvansvilleSydney

EVV Evansville Dress Regional - SYD Sydney Kingsford Smith

EVVSYD

Evansville Dress Regional

Thu 5/11

16:15-09:00

2 stops23h 45m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$974

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 29/9

21:10-08:00

2 stops67h 50m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$981

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

10:53-09:05

2 stops29h 12m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$992

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 3/11

06:15-07:00

1 stop31h 45m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$992

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 30/9

14:25-06:50

2 stops25h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,020

Flights are sorted by cheapest return flights first.

Deals found on 11/9

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.

STL-SYD

EVV-SYD

ORD-SYD

MDW-SYD

PIA-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

STL-SYD

EVV-SYD

ORD-SYD

MDW-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 $1,790). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,463). 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 $1,772 and $2,394 in October.
The cheapest return price found within the last 5 days was $1,678 on Air Canada (20 Oct–27 Oct).

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 83 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 26h 24m. American Airlines provides one of the quickest options available for as low as $1,836. 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, June is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,790). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,463). 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$2,217	Average$2,283	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 $747

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/10. 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 15 September 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 15 September 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 15 September 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 15 September 2026.

Last-minute flights from Illinois to SydneyDiscover last-minute flight deals from Illinois to Sydney. Data last updated 15 September 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Sydney. Data last updated 15 September 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 15 September 2026.

Search for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated 15 September 2026.

Find flight deals from Illinois to Sydney

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Cheapest in

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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 $1,772 and $2,394 in October.The cheapest return price found within the last 5 days was $1,678 on Air Canada (20 Oct–27 Oct).

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 83 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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Alternative routes for Illinois to 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 15 September 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 15 September 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 15 September 2026.

Last-minute flights from Illinois to Sydney
Discover last-minute flight deals from Illinois to Sydney. Data last updated 15 September 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 15 September 2026.

Illinois to Sydney flights typically cost between $1,772 and $2,394 in October.
The cheapest return price found within the last 5 days was $1,678 on Air Canada (20 Oct–27 Oct).