How long does it take to fly to Sydney?

Flight times from Illinois to Sydney vary, but if you’re flying out of Chicago and flying into Sydney (one of the most popular routes), then the duration is 22h 05m on average. Another popular route from Illinois to Sydney is flying from Peoria to Sydney, which will take roughly 23h 47m. Keep in mind that layovers or delays could extend your travel time.

What is the cheapest airline that flies from Illinois to Sydney Kingsford Smith?

Qantas Airways, United Airlines, and Air Canada are the most popular carriers operating from Illinois to Sydney Kingsford Smith

What airlines fly to Sydney?

American Airlines, Qantas Airways and United Airlines are the top three most popular airlines that fly to Sydney from Illinois according to our data. American Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 8 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Illinois to Sydney Kingsford Smith Airport?

Prices for flights from Illinois to Sydney Kingsford Smith Airport are updated daily.

How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?

There are 8 operators available for flights from Illinois to Sydney Kingsford Smith Airport as of September 2025.

How old do you have to be to fly from Illinois to Sydney Kingsford Smith Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Sydney Kingsford Smith Airport.

What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$504 Cheap Flights from Illinois to Sydney in 2025/26

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Find the cheapest flights from Illinois to Sydney

Round-trip

One-way

Last minute

Cheap round-trip flights

6:15 am - 7:00 amMDW-SYD

31h 45m2 stops

12:10 pm - 9:35 pmSYD-MDW

26h 25m2 stops

$993Multiple Airlines

Find Deal

Sat, Nov 8 - Sat, Nov 15

6:39 am - 9:00 amSTL-SYD

34h 21m1 stop

5:50 pm - 3:29 pmSYD-STL

38h 39m2 stops

$997Qantas Airways

Find Deal

Wed, Oct 29 - Thu, Nov 13

10:00 am - 7:45 pmORD-SYD

40h 45m2 stops

9:40 pm - 4:30 pmSYD-ORD

35h 50m2 stops

$1,058Alaska Airlines

Find Deal

Wed, Nov 12 - Tue, Nov 18

10:05 am - 7:45 pmORD-SYD

41h 40m2 stops

9:40 pm - 9:40 pmSYD-ORD

40h 00m2 stops

$1,069Alaska Airlines

Find Deal

Tue, Oct 21 - Tue, Oct 28

4:45 pm - 12:30 pmORD-SYD

26h 45m2 stops

2:10 pm - 7:18 pmSYD-ORD

22h 08m2 stops

$1,116Fiji Airways

Find Deal

Sat, Feb 28 - Sat, Mar 7

2:00 pm - 7:45 pmORD-SYD

36h 45m2 stops

9:40 pm - 1:04 pmSYD-ORD

32h 24m2 stops

$1,117Hawaiian Airlines

Find Deal

Sat, Jan 24 - Fri, Feb 13

2:00 pm - 7:45 pmORD-SYD

36h 45m2 stops

9:40 pm - 1:04 pmSYD-ORD

32h 24m2 stops

$1,118Hawaiian Airlines

Find Deal

Sat, Jan 24 - Fri, Feb 13

4:45 pm - 12:30 pmORD-SYD

26h 45m2 stops

2:10 pm - 9:07 pmSYD-ORD

22h 57m2 stops

$1,127Fiji Airways

Find Deal

Tue, Feb 24 - Tue, Mar 10

4:25 pm - 8:15 pmORD-SYD

34h 50m1 stop

12:25 pm - 5:03 amSYD-ORD

32h 38m2 stops

$1,156ANA

Find Deal

Tue, Feb 24 - Tue, Mar 10

4:25 pm - 10:30 amORD-SYD

25h 05m1 stop

12:25 pm - 8:20 amSYD-ORD

35h 55m1 stop

$1,213ANA

Find Deal

Tue, Feb 24 - Tue, Mar 10

American Airlines flights from Illinois to Sydney

Our best American Airlines deals on Illinois to Sydney flight tickets

American Airlines

Nov 8

STL7:00 amLambert-St Louis

31h 25m

1 stop

SYD7:25 amSydney Kingsford Smith

Nov 15

SYD5:45 pmSydney Kingsford Smith

22h 57m

1 stop

STL11:42 pmLambert-St Louis

$1,347

Find similar

American Airlines

Nov 7

STL7:00 amLambert-St Louis

33h 00m

1 stop

SYD9:00 amSydney Kingsford Smith

Nov 14

SYD2:05 pmSydney Kingsford Smith

19h 22m

1 stop

STL4:27 pmLambert-St Louis

$1,350

Find similar

American Airlines

Sep 28

STL1:53 pmLambert-St Louis

25h 12m

2 stops

SYD6:05 amSydney Kingsford Smith

Oct 5

SYD6:45 pmSydney Kingsford Smith

20h 14m

1 stop

STL10:59 pmLambert-St Louis

$1,351

Find similar

United Airlines flights from Illinois to Sydney

Our best United Airlines deals on Illinois to Sydney flight tickets

United Airlines

Nov 1

PIA1:20 pmGreater Peoria

27h 45m

2 stops

SYD9:05 amSydney Kingsford Smith

Nov 14

SYD11:20 amSydney Kingsford Smith

27h 11m

2 stops

PIA9:31 pmGreater Peoria

$1,235

Find similar

United Airlines

Nov 5

STL4:35 pmLambert-St Louis

21h 25m

1 stop

SYD7:00 amSydney Kingsford Smith

Nov 23

SYD12:10 pmSydney Kingsford Smith

21h 17m

1 stop

STL4:27 pmLambert-St Louis

$1,292

Find similar

United Airlines

Sep 28

STL4:50 pmLambert-St Louis

23h 05m

2 stops

SYD6:55 amSydney Kingsford Smith

Oct 5

SYD10:30 amSydney Kingsford Smith

24h 27m

2 stops

STL6:57 pmLambert-St Louis

$1,297

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Sat 11/8

6:15 am-7:00 am

2 stops31h 45m

Sydney Kingsford Smith

Sat 11/15

12:10 pm-9:35 pm

2 stops26h 25m

$993

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/29

6:39 am-9:00 am

1 stop34h 21m

Sydney Kingsford Smith

Thu 11/13

5:50 pm-3:29 pm

2 stops38h 39m

$997

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 11/12

10:00 am-7:45 pm

2 stops40h 45m

Sydney Kingsford Smith

Tue 11/18

9:40 pm-4:30 pm

2 stops35h 50m

$1,058

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/21

10:05 am-7:45 pm

2 stops41h 40m

Sydney Kingsford Smith

Tue 10/28

9:40 pm-9:40 pm

2 stops40h 00m

$1,069

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 2/28

4:45 pm-12:30 pm

2 stops26h 45m

Sydney Kingsford Smith

Sat 3/7

2:10 pm-7:18 pm

2 stops22h 08m

$1,116

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 1/24

2:00 pm-7:45 pm

2 stops36h 45m

Sydney Kingsford Smith

Fri 2/13

9:40 pm-1:04 pm

2 stops32h 24m

$1,117

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 1/24

2:00 pm-7:45 pm

2 stops36h 45m

Sydney Kingsford Smith

Fri 2/13

9:40 pm-1:04 pm

2 stops32h 24m

$1,118

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/24

4:45 pm-12:30 pm

2 stops26h 45m

Sydney Kingsford Smith

Tue 3/10

2:10 pm-9:07 pm

2 stops22h 57m

$1,127

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/24

4:25 pm-8:15 pm

1 stop34h 50m

Sydney Kingsford Smith

Tue 3/10

12:25 pm-5:03 am

2 stops32h 38m

$1,156

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/24

4:25 pm-10:30 am

1 stop25h 05m

Sydney Kingsford Smith

Tue 3/10

12:25 pm-8:20 am

1 stop35h 55m

$1,213

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How to get the cheapest flight ticket from Illinois to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Sydney?

In general, August is the cheapest month to fly from Illinois to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $851. If you are unable to visit Sydney during the month of August, then departing from Illinois during the month May is also very affordable. Most momondo users find prices during this month for around $867.

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Illinois to Sydney is on a Saturday when prices can be found for as low as $1,166. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,391.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the morning. momondo users have found flights departing from Illinois to Sydney in the morning for as low as $1,224. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the evening, with an average ticket price of $1,412. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,108 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Illinois for as low as $859 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 9% on your flight if you consider stops on a Illinois to Sydney flight.

Cheap Illinois to Sydney flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Sydney

Direct flights	None

There are no direct flights from Illinois to Sydney. There are no popular flight routes from Illinois to Sydney.

Search flight deals

When did momondo last update prices for flights from Illinois to Sydney Kingsford Smith Airport?
Prices for flights from Illinois to Sydney Kingsford Smith Airport are updated daily.
How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?
There are 8 operators available for flights from Illinois to Sydney Kingsford Smith Airport as of September 2025.
How old do you have to be to fly from Illinois to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Illinois to Sydney

Compare and see reviews for airlines that fly from Illinois to Sydney with momondo

Airline	Rating	Free Cancellation	Price
ANA	PriceFrom $679	Free Cancellation	Rating 8.4 972 reviews	Search ANA flights
Qantas Airways	PriceFrom $812	Free Cancellation	Rating 7.5 908 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $823	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $846	Free Cancellation	Rating 7.9 7,973 reviews	Search Delta flights
Fiji Airways	PriceFrom $849	Free Cancellation	Rating 8.0 205 reviews	Search Fiji Airways flights
United Airlines	PriceFrom $876	Free Cancellation	Rating 7.4 8,928 reviews	Search United Airlines flights
Air Canada	PriceFrom $959	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
Air New Zealand	PriceFrom $1,282	Free Cancellation	Rating 7.9 506 reviews	Search Air New Zealand flights

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Katoomba

Wollongong

Randwick

Cronulla

Coogee

Lithgow

Penrith

Manly

Leura

Charlestown

Terrigal

Swansea

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Why should I use momondo to find a flight deal from Illinois to Sydney?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Sydney for you.

Can I find flights from Illinois to Sydney with flexible booking policies on momondo?

All flight searches from Illinois to Sydney on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Illinois to Sydney?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Sydney.

I’m not ready to book a flight from Illinois to Sydney right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from Illinois and alert you when they change.

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Cheap flights from Illinois to Sydney from $504

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Sydney departing on 11/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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American Airlines flights from Illinois to Sydney

Our best American Airlines deals on Illinois to Sydney flight tickets

United Airlines flights from Illinois to Sydney

Our best United Airlines deals on Illinois to Sydney flight tickets

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How to get the cheapest flight ticket from Illinois to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Sydney?

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Illinois to Sydney is on a Saturday when prices can be found for as low as $1,166. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,391.

What is the cheapest time of day to depart on your flight to Sydney?

How far in advance should I book a flight to Sydney?

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 9% on your flight if you consider stops on a Illinois to Sydney flight.

What is the cheapest airline that flies from Illinois to Sydney Kingsford Smith?

Qantas Airways, United Airlines, and Air Canada are the most popular carriers operating from Illinois to Sydney Kingsford Smith

What airlines fly to Sydney?

How long does it take to fly to Sydney?

Cheap Illinois to Sydney flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Sydney

Direct flights

When did momondo last update prices for flights from Illinois to Sydney Kingsford Smith Airport?

How many operators does momondo search for flights from Illinois to Sydney Kingsford Smith Airport?

How old do you have to be to fly from Illinois to Sydney Kingsford Smith Airport?

What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

Best airlines flying from Illinois to Sydney

Compare and see reviews for airlines that fly from Illinois to Sydney with momondo

Traveling to a place near Sydney?

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Sydney?

Can I find flights from Illinois to Sydney with flexible booking policies on momondo?

How can momondo help me find flights from Illinois to Sydney?

I’m not ready to book a flight from Illinois to Sydney right now. Can momondo alert me if prices change?

An easier way to manage your Sydney trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Australia

Airports servicing New South Wales