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 24h 26m on average. Another popular route from Illinois to Sydney is flying from Peoria to Sydney, which will take roughly 25h 25m. 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?

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

What airlines fly to Sydney?

Qantas Airways, American Airlines and United Airlines are the top three most popular airlines that fly to Sydney from Illinois according to our data. Qantas Airways is the first choice among our users, with 43% 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 February 2026.

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.

$500 Cheap Flights from Illinois to Sydney in 2026

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Find the cheapest flights from Illinois to Sydney

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One-way

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4:13 pm - 8:50 pm

STL

SYD

35h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$898Qantas Airways

Tue, Mar 3 - Tue, Mar 10

4:13 pm - 8:50 pm

STL

SYD

36h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$899Qantas Airways

Thu, Mar 19 - Wed, Mar 25

6:38 am - 9:00 am

STL

SYD

33h 22m

1 stop

5:50 pm - 3:28 pm

SYD

STL

37h 38m

2 stops

$908Qantas Airways

Fri, Feb 27 - Mon, Mar 9

6:00 am - 7:30 am

ORD

SYD

34h 30m

1 stop

1:15 pm - 6:46 am

SYD

ORD

32h 31m

2 stops

$965Multiple Airlines

Fri, May 15 - Thu, May 21

1:00 pm - 7:20 am

STL

SYD

27h 20m

2 stops

9:20 am - 8:05 pm

SYD

STL

25h 45m

2 stops

$1,151Air Canada

Mon, May 4 - Mon, May 18

10:05 am - 8:35 am

STL

SYD

30h 30m

2 stops

10:20 am - 3:29 pm

SYD

STL

45h 09m

2 stops

$1,157Multiple Airlines

Wed, Mar 11 - Wed, Mar 18

10:42 am - 6:55 am

PIA

SYD

29h 13m

2 stops

10:20 am - 12:14 am

SYD

PIA

28h 54m

2 stops

$1,273United Airlines

Sat, Jul 11 - Fri, Aug 14

6:00 am - 6:55 am

PIA

SYD

33h 55m

2 stops

9:30 am - 7:04 pm

SYD

PIA

24h 34m

2 stops

$1,324United Airlines

Sat, Jul 11 - Fri, Aug 14

1:28 pm - 6:50 am

MDW

SYD

24h 22m

2 stops

10:40 am - 9:31 pm

SYD

MDW

27h 51m

2 stops

$1,387Delta

Tue, Feb 17 - Sun, Mar 8

12:45 pm - 6:50 am

MDW

SYD

25h 05m

2 stops

10:40 am - 5:22 pm

SYD

MDW

22h 42m

2 stops

$1,437Delta

Thu, Feb 19 - Mon, Mar 9

Air New Zealand flights from Illinois to Sydney

Our best Air New Zealand deals on Illinois to Sydney flight tickets

Air New Zealand

May 4

STL6:00 amLambert-St Louis

35h 45m

2 stops

SYD8:45 amSydney Kingsford Smith

May 18

SYD11:55 amSydney Kingsford Smith

25h 35m

2 stops

STL10:30 pmLambert-St Louis

$1,233

Air New Zealand

May 4

STL6:00 amLambert-St Louis

37h 40m

2 stops

SYD10:40 amSydney Kingsford Smith

May 18

SYD11:55 amSydney Kingsford Smith

32h 52m

2 stops

STL5:47 amLambert-St Louis

$1,234

Air New Zealand

May 2

STL4:44 pmLambert-St Louis

26h 56m

2 stops

SYD10:40 amSydney Kingsford Smith

May 16

SYD7:20 pmSydney Kingsford Smith

49h 27m

2 stops

STL5:47 amLambert-St Louis

$1,292

American Airlines flights from Illinois to Sydney

Our best American Airlines deals on Illinois to Sydney flight tickets

American Airlines

Feb 25

STL7:00 amLambert-St Louis

30h 55m

1 stop

SYD6:55 amSydney Kingsford Smith

Mar 2

SYD2:05 pmSydney Kingsford Smith

20h 08m

1 stop

STL5:13 pmLambert-St Louis

$1,264

American Airlines

Feb 25

STL2:31 pmLambert-St Louis

25h 29m

2 stops

SYD9:00 amSydney Kingsford Smith

Mar 2

SYD11:20 amSydney Kingsford Smith

23h 40m

2 stops

STL6:00 pmLambert-St Louis

$1,266

American Airlines

Mar 4

STL6:38 amLambert-St Louis

33h 22m

1 stop

SYD9:00 amSydney Kingsford Smith

Mar 10

SYD11:20 amSydney Kingsford Smith

24h 09m

2 stops

STL7:29 pmLambert-St Louis

$1,269

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/3

4:13 pm-8:50 pm

2 stops35h 37m

Sydney Kingsford Smith

Tue 3/10

11:20 am-11:58 pm

1 stop28h 38m

$898

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 3/19

4:13 pm-8:50 pm

2 stops36h 37m

Sydney Kingsford Smith

Wed 3/25

11:20 am-11:58 pm

1 stop28h 38m

$899

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/27

6:38 am-9:00 am

1 stop33h 22m

Sydney Kingsford Smith

Mon 3/9

5:50 pm-3:28 pm

2 stops37h 38m

$908

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 5/15

6:00 am-7:30 am

1 stop34h 30m

Sydney Kingsford Smith

Thu 5/21

1:15 pm-6:46 am

2 stops32h 31m

$965

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:00 pm-7:20 am

2 stops27h 20m

Sydney Kingsford Smith

Mon 5/18

9:20 am-8:05 pm

2 stops25h 45m

$1,151

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/11

10:05 am-8:35 am

2 stops30h 30m

Sydney Kingsford Smith

Wed 3/18

10:20 am-3:29 pm

2 stops45h 09m

$1,157

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Sat 7/11

10:42 am-6:55 am

2 stops29h 13m

Sydney Kingsford Smith

Fri 8/14

10:20 am-12:14 am

2 stops28h 54m

$1,273

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Sat 7/11

6:00 am-6:55 am

2 stops33h 55m

Sydney Kingsford Smith

Fri 8/14

9:30 am-7:04 pm

2 stops24h 34m

$1,324

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Tue 2/17

1:28 pm-6:50 am

2 stops24h 22m

Sydney Kingsford Smith

Sun 3/8

10:40 am-9:31 pm

2 stops27h 51m

$1,387

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Thu 2/19

12:45 pm-6:50 am

2 stops25h 05m

Sydney Kingsford Smith

Mon 3/9

10:40 am-5:22 pm

2 stops22h 42m

$1,437

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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, October 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 $966. If you are unable to visit Sydney during the month of October, then departing from Illinois during the month February is also very affordable. Most momondo users find prices during this month for around $1,097.

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 $1,265 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 $1,052 on momondo.

Can stopping save me money on Illinois to Sydney flights?

You could potentially save up to 15% 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

Fastest flight time	23h 15m
Direct flights	None

The fastest flight from Illinois to Sydney takes 23h 15m

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 February 2026.
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
Fiji Airways	PriceFrom $795	Free Cancellation	Rating 8.0 225 reviews	Search Fiji Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,277 reviews	Search American Airlines flights
Qantas Airways	PriceFrom $812	Free Cancellation	Rating 7.5 988 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $870	Free Cancellation	Rating 7.4 9,283 reviews	Search United Airlines flights
Air Canada	PriceFrom $890	Free Cancellation	Rating 7.1 10,712 reviews	Search Air Canada flights
Delta	PriceFrom $935	Free Cancellation	Rating 7.9 8,187 reviews	Search Delta flights
ANA	PriceFrom $1,177	Free Cancellation	Rating 8.4 1,092 reviews	Search ANA flights
Air New Zealand	PriceFrom $1,282	Free Cancellation	Rating 8.0 582 reviews	Search Air New Zealand flights

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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.

An easier way to manage your Sydney trip

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Cheap flights from Illinois to Sydney from $500

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 3/17. 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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How to get the cheapest flight ticket from Illinois to Sydney

What is the cheapest month to fly to Sydney?

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

Can stopping save me money on Illinois to Sydney flights?

What is the cheapest airline that flies 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

Fastest flight time

Direct flights

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.

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List of cabin classes available on flights landing in Sydney. Availability may vary depending on flight origin and airline.

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