How long is the flight from Illinois to Sydney?

A quick flight from Illinois to Sydney can take about 21h 01m. United Airlines provides one of the quickest options available for as low as $1,953. The distance between Illinois and Sydney is about 14790 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.

$724+ 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 4 September 2026.

Sun 25/1011:30 -

1 stop40h 45m

Sat 7/1112:25 -

1 stop35h 55m

Deal found 2/9$1,667

Sun 25/1017:35 -

1 stop34h 40m

Mon 9/1112:25 -

2 stops33h 55m

Deal found 2/9$1,710

Mon 26/1014:40 -

2 stops27h 55m

Wed 11/1111:50 -

2 stops25h 47m

Deal found 4/9$1,715

Wed 11/1113:30 -

2 stops28h 05m

Mon 16/1111:50 -

2 stops25h 47m

Deal found 3/9$1,717

Wed 21/1015:00 -

2 stops25h 45m

Mon 9/1109:55 -

2 stops28h 41m

Deal found 2/9$1,718

Sat 31/1021:35 -

2 stops45h 00m

Wed 11/1109:55 -

2 stops27h 42m

Deal found 4/9$1,728

Sun 1/1106:00 -

2 stops35h 35m

Sun 15/1119:25 -

2 stops42h 12m

Deal found 31/8$1,746

Tue 20/1015:12 -

2 stops34h 58m

Sat 27/209:55 -

2 stops29h 00m

Deal found 1/9$1,812

Sun 25/1017:55 -

1 stop21h 05m

Mon 9/1111:50 -

2 stops26h 09m

Deal found 31/8$1,833

Tue 20/1008:35 -

2 stops41h 35m

Wed 24/209:55 -

2 stops29h 00m

Deal found 1/9$1,840

Tue 8/1208:30 -

1 stop31h 50m

Wed 16/1209:15 -

1 stop26h 26m

Deal found 1/9$1,846

Mon 19/1015:12 -

2 stops27h 28m

Sat 27/209:55 -

2 stops29h 00m

Deal found 1/9$1,850

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 4 September 2026.

Wed 3/208:14 -

2 stops29h 06m

Tue 16/211:50 -

2 stops21h 41m

Deal found 2/9$1,825

Mon 19/1012:00 -

2 stops27h 50m

Mon 1/310:40 -

2 stops24h 21m

Deal found 1/9$1,853

Sat 31/1017:54 -

1 stop21h 01m

Sun 8/1114:05 -

1 stop20h 16m

Deal found 31/8$1,953

Wed 21/1006:04 -

1 stop34h 01m

Fri 26/211:20 -

1 stop29h 28m

Deal found 1/9$2,028

Sat 17/1014:21 -

2 stops60h 29m

Thu 5/1121:40 -

2 stops32h 37m

Deal found 1/9$2,082

Sun 27/918:43 -

2 stops44h 27m

Wed 3/308:45 -

2 stops30h 20m

Deal found 3/9$2,240

Sun 15/1107:00 -

3 stops30h 25m

Fri 27/1111:15 -

2 stops29h 44m

Deal found 1/9$2,647

Fri 6/1106:40 -

2 stops55h 10m

Tue 10/1115:50 -

2 stops49h 09m

Deal found 2/9$2,939

Sun 31/106:25 -

2 stops30h 55m

Tue 16/211:50 -

2 stops21h 41m

Deal found 2/9$1,825

Tue 20/1014:25 -

2 stops25h 25m

Thu 25/210:40 -

2 stops24h 21m

Deal found 1/9$1,922

Thu 22/1006:04 -

1 stop34h 01m

Mon 1/311:20 -

1 stop29h 28m

Deal found 1/9$2,029

Tue 2/214:35 -

2 stops25h 45m

Sun 14/211:50 -

2 stops21h 41m

Deal found 2/9$1,894

Sat 17/1014:21 -

2 stops60h 29m

Sat 31/1021:40 -

2 stops24h 20m

Deal found 1/9$2,086

Fri 2/1006:15 -

2 stops33h 35m

Fri 26/210:40 -

2 stops28h 01m

Deal found 3/9$1,992

Sat 14/1116:25 -

3 stops46h 00m

Sat 28/1106:35 -

3 stops48h 50m

Deal found 1/9$4,434

Sat 31/1007:01 -

3 stops40h 54m

Sun 8/1122:20 -

2 stops41h 54m

Deal found 31/8$2,093

Sat 30/114:35 -

2 stops25h 45m

Sat 13/211:50 -

2 stops21h 41m

Deal found 2/9$1,964

Sat 31/1012:35 -

1 stop26h 20m

Wed 4/1121:50 -

2 stops34h 58m

Deal found 4/9$2,182

Fri 29/114:35 -

2 stops25h 45m

Sun 14/211:50 -

2 stops21h 41m

Deal found 2/9$1,964

Sun 18/1007:20 -

2 stops43h 30m

Sat 24/1020:45 -

2 stops56h 40m

Deal found 30/8$2,180

Mon 25/113:00 -

2 stops26h 30m

Sun 14/210:40 -

2 stops28h 30m

Deal found 31/8$2,241

Fri 19/211:00 -

1 stop27h 00m

Sun 28/211:50 -

1 stop27h 05m

Deal found 31/8$1,985

Tue 9/208:00 -

3 stops29h 25m

Tue 16/221:40 -

2 stops33h 14m

Deal found 2/9$2,204

Wed 10/209:30 -

2 stops30h 00m

Wed 17/210:40 -

2 stops23h 10m

Deal found 3/9$2,241

Fri 2/1010:27 -

2 stops29h 33m

Fri 9/1011:20 -

2 stops21h 17m

Deal found 3/9$1,990

Sun 25/1019:16 -

2 stops32h 29m

Sat 7/1121:40 -

3 stops25h 00m

Deal found 2/9$2,204

Tue 9/213:00 -

2 stops26h 30m

Tue 16/210:40 -

2 stops23h 10m

Deal found 3/9$2,241

Tue 29/906:30 -

1 stop33h 35m

Tue 2/311:20 -

1 stop29h 28m

Deal found 3/9$2,769

Sun 15/1110:34 -

2 stops28h 56m

Sat 5/1210:40 -

2 stops23h 10m

Deal found 2/9$2,241

Sun 15/1107:20 -

3 stops30h 05m

Sat 5/1221:40 -

3 stops26h 20m

Deal found 2/9$2,319

Find flight deals from Illinois to Sydney

Round-trip from	$1,667
One-way from	$724
Popular in	December
Cheapest in	February
Average price	$2,182

ANA
25/10-7/11
2 total stops
76h 40m total
Illinois to Sydney

Search Deals

16/10-31/12
1 total stop
43h 29m total
Illinois to Sydney

Search Deals

Highest demand for flights based on searches. 3% potential increase in price ($92 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($33 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

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Wed 14/10

20:25-10:45

2 stops46h 20m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$928

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 27/10

12:47-06:55

1 stop26h 08m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$976

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 27/10

09:40-09:20

2 stops31h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$983

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 7/10

13:29-08:00

2 stops26h 31m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$983

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 3/10

17:46-07:50

2 stops46h 04m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,017

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Fri 25/12

17:45-20:15

2 stops33h 30m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,046

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 2/10

09:04-07:00

2 stops30h 56m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,066

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 15/10

17:53-18:50

3 stops32h 57m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,121

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 4/10

07:08-07:55

1 stop32h 47m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,134

ChicagoSydney

ORD Chicago O'Hare Intl - SYD Sydney Kingsford Smith

ORDSYD

Chicago O'Hare Intl

Tue 5/1

20:15-19:25

2 stops54h 10m

Sydney Kingsford Smith

Wed 31/12

00:00-08:00

Nonstop0h 00m

$1,184

Flights are sorted by cheapest return flights first.

Deals found on 1/9

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.

PIA-SYD

STL-SYD

EVV-SYD

ORD-SYD

MDW-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

PIA-SYD

STL-SYD

EVV-SYD

ORD-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 $1,779). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,459). 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 $1,796 and $2,372 in October.
The cheapest return price found within the last 5 days was $1,667 on ANA (25 Oct–7 Nov).

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 21h 01m. United Airlines provides one of the quickest options available for as low as $1,953. The distance between Illinois and Sydney is about 14790 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 $1,779). Flying from Illinois to Sydney in December is currently the most expensive (average of $2,459). 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$2,196	Average$2,262	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 $724

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/10. 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 4 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 4 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 4 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 4 September 2026.

Last-minute flights from Illinois to SydneyDiscover last-minute flight deals from Illinois to Sydney. Data last updated 4 September 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Sydney. Data last updated 4 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 4 September 2026.

Search for one-way flight options from Illinois to Sydney. Find affordable one-way fares based on user searches. Data last updated 4 September 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 $1,796 and $2,372 in October.The cheapest return price found within the last 5 days was $1,667 on ANA (25 Oct–7 Nov).

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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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 4 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 4 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 4 September 2026.

Last-minute flights from Illinois to Sydney
Discover last-minute flight deals from Illinois to Sydney. Data last updated 4 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 4 September 2026.

Illinois to Sydney flights typically cost between $1,796 and $2,372 in October.
The cheapest return price found within the last 5 days was $1,667 on ANA (25 Oct–7 Nov).