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

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

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

Prices for flights from Sydney Kingsford Smith Airport to Illinois are refreshed on a daily basis.

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

As of September 2026, there is 1 operator available to choose from for flights from Sydney Kingsford Smith Airport to Illinois.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Sydney Kingsford Smith Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$403 Cheap Flights from Sydney to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Sydney to Illinois

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:20 am - 8:01 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 41m1 stop Vancouver Intl

10:37 am - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

29h 58m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$927Air Canada

Wed, Oct 28 - Tue, Nov 24

10:20 am - 7:52 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 32m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

10:37 am - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

29h 58m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$929Air Canada

Wed, Oct 28 - Tue, Nov 24

10:20 am - 8:01 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 41m1 stop Vancouver Intl

3:30 pm - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

25h 05m1 stop Vancouver Intl

$946Air Canada

Wed, Oct 28 - Tue, Nov 24

10:20 am - 2:43 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 23m1 stop Vancouver Intl

3:30 pm - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

25h 05m1 stop Vancouver Intl

$946Air Canada

Mon, Oct 19 - Mon, Nov 2

1:15 pm - 12:45 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

26h 30m3 stops Nadi Los Angeles Dallas/Fort Worth

6:30 am - 12:35 pmORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

38h 05m3 stops Denver Intl Los Angeles Nadi

$947Multiple Airlines

Thu, Oct 1 - Mon, Oct 26

10:20 am - 8:12 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 52m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

8:49 am - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

31h 46m1 stop Vancouver Intl

$948Air Canada

Mon, Oct 19 - Mon, Nov 2

10:20 am - 2:37 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 17m1 stop Vancouver Intl

8:49 am - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

31h 46m1 stop Vancouver Intl

$949Air Canada

Tue, Oct 27 - Tue, Nov 24

10:20 am - 8:12 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

25h 52m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

1:55 pm - 9:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$949Air Canada

Mon, Oct 19 - Mon, Nov 2

11:10 am - 5:59 amSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

35h 49m1 stop Los Angeles

3:06 pm - 6:35 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

22h 29m1 stop Las Vegas Harry Reid Intl

$1,529Qantas Airways

Tue, Dec 1 - Tue, Jan 26

6:50 pm - 11:30 pmSYD Sydney Kingsford Smith-ORD Chicago O'Hare Intl

20h 40m1 stop Los Angeles

5:16 pm - 6:55 amORD Chicago O'Hare Intl-SYD Sydney Kingsford Smith

21h 39m1 stop Dallas/Fort Worth

$1,977Qantas Airways

Mon, Oct 5 - Mon, Oct 12

Cheap last minute flights

Enter your travel dates to find the best prices.

9:20 am - 12:02 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

41h 42m2 stops Vancouver Intl Chicago O'Hare Intl

4:39 pm - 8:35 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 56m2 stops Denver Intl Vancouver Intl

$1,147Air Canada

Thu, Sep 17 - Fri, Oct 30

9:10 am - 11:30 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 20m1 stop Los Angeles

6:44 pm - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

43h 11m1 stop Dallas/Fort Worth

$1,177Qantas Airways

Thu, Sep 17 - Sat, Nov 7

9:10 am - 11:30 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 20m1 stop Los Angeles

8:10 am - 9:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 50m1 stop Los Angeles

$1,178American Airlines

Thu, Sep 17 - Thu, Nov 5

9:10 am - 4:40 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 30m2 stops Los Angeles Dallas/Fort Worth

8:10 am - 9:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 50m1 stop Los Angeles

$1,178American Airlines

Thu, Sep 17 - Thu, Nov 5

9:10 am - 4:40 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 30m2 stops Los Angeles Dallas/Fort Worth

2:54 pm - 9:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 06m2 stops Dallas/Fort Worth Los Angeles

$1,178American Airlines

Thu, Sep 17 - Sat, Nov 7

9:10 am - 4:40 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 30m2 stops Los Angeles Dallas/Fort Worth

2:54 pm - 9:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 06m2 stops Dallas/Fort Worth Los Angeles

$1,178American Airlines

Thu, Sep 17 - Thu, Nov 5

9:10 am - 11:30 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 20m1 stop Los Angeles

6:44 pm - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

43h 11m1 stop Dallas/Fort Worth

$1,180Qantas Airways

Thu, Sep 17 - Sat, Nov 7

9:10 am - 7:45 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

25h 35m2 stops Los Angeles Dallas/Fort Worth

8:10 am - 9:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 50m1 stop Los Angeles

$1,191American Airlines

Thu, Sep 17 - Sat, Nov 7

9:10 am - 7:45 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

25h 35m2 stops Los Angeles Dallas/Fort Worth

12:58 pm - 9:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 02m2 stops Dallas/Fort Worth Los Angeles

$1,191American Airlines

Thu, Sep 17 - Sat, Nov 7

9:15 am - 4:47 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 32m2 stops Los Angeles Minneapolis St Paul

7:00 am - 8:30 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 30m2 stops Atlanta Hartsfield-Jackson Los Angeles

$1,196Delta

Tue, Sep 15 - Thu, Nov 5

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Delta flights from Sydney to Illinois

Our best Delta deals on Sydney to Illinois flight tickets

Delta

Sep 15

SYD9:15 amSydney Kingsford Smith

22h 32m

2 stops

STL4:47 pmLambert-St Louis

Nov 5

STL7:00 amLambert-St Louis

32h 30m

2 stops

SYD8:30 amSydney Kingsford Smith

$1,196

Delta

Sep 17

SYD9:15 amSydney Kingsford Smith

27h 18m

2 stops

ORD9:33 pmChicago O'Hare Intl

Sep 30

ORD5:10 pmChicago O'Hare Intl

22h 40m

2 stops

SYD6:50 amSydney Kingsford Smith

$1,616

Delta

Sep 17

SYD9:15 amSydney Kingsford Smith

27h 18m

2 stops

ORD9:33 pmChicago O'Hare Intl

Sep 30

ORD5:10 pmChicago O'Hare Intl

22h 40m

2 stops

SYD6:50 amSydney Kingsford Smith

$1,617

Cathay Pacific flights from Sydney to Illinois

Our best Cathay Pacific deals on Sydney to Illinois flight tickets

Cathay Pacific

Sep 17

SYD7:40 amSydney Kingsford Smith

45h 15m

1 stop

ORD1:55 pmChicago O'Hare Intl

Oct 14

ORD4:15 pmChicago O'Hare Intl

28h 30m

1 stop

SYD12:45 pmSydney Kingsford Smith

$1,854

Cathay Pacific

Oct 21

SYD10:20 pmSydney Kingsford Smith

38h 37m

2 stops

STL8:57 pmLambert-St Louis

Oct 24

STL1:06 pmLambert-St Louis

31h 54m

2 stops

SYD1:00 pmSydney Kingsford Smith

$1,876

Cathay Pacific

Sep 17

SYD7:40 amSydney Kingsford Smith

45h 15m

1 stop

ORD1:55 pmChicago O'Hare Intl

Oct 14

ORD4:15 pmChicago O'Hare Intl

47h 30m

2 stops

SYD7:45 amSydney Kingsford Smith

$1,952

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Wed 10/28

10:20 am-8:01 pm

1 stop25h 41m

Chicago O'Hare Intl

Tue 11/24

10:37 am-9:35 am

2 stops29h 58m

$927

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Wed 10/28

10:20 am-7:52 pm

2 stops25h 32m

Chicago O'Hare Intl

Tue 11/24

10:37 am-9:35 am

2 stops29h 58m

$929

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Wed 10/28

10:20 am-8:01 pm

1 stop25h 41m

Chicago O'Hare Intl

Tue 11/24

3:30 pm-9:35 am

1 stop25h 05m

$946

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 10/19

10:20 am-2:43 pm

1 stop20h 23m

Chicago O'Hare Intl

Mon 11/2

3:30 pm-9:35 am

1 stop25h 05m

$946

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 10/1

1:15 pm-12:45 am

3 stops26h 30m

Chicago O'Hare Intl

Mon 10/26

6:30 am-12:35 pm

3 stops38h 05m

$947

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 10/19

10:20 am-8:12 pm

2 stops25h 52m

Chicago O'Hare Intl

Mon 11/2

8:49 am-9:35 am

1 stop31h 46m

$948

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Tue 10/27

10:20 am-2:37 pm

1 stop20h 17m

Chicago O'Hare Intl

Tue 11/24

8:49 am-9:35 am

1 stop31h 46m

$949

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 10/19

10:20 am-8:12 pm

2 stops25h 52m

Chicago O'Hare Intl

Mon 11/2

1:55 pm-9:35 am

2 stops26h 40m

$949

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Tue 12/1

11:10 am-5:59 am

1 stop35h 49m

Chicago O'Hare Intl

Tue 1/26

3:06 pm-6:35 am

1 stop22h 29m

$1,529

Quickest round-trip

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Mon 10/5

6:50 pm-11:30 pm

1 stop20h 40m

Chicago O'Hare Intl

Mon 10/12

5:16 pm-6:55 am

1 stop21h 39m

$1,977

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 Sydney to Illinois

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

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Sydney is in October. Flight prices, which tend to average around $1,053, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of October, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,143.

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

You are more likely to see cheaper flights to Illinois from Sydney when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $1,435 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Sydney for as low as $875 on momondo.

Can stopping save me money on Sydney to Illinois flights?

You could potentially save up to 17% on your flight if you consider stops on a Sydney to Illinois flight.

Cheap Sydney to Illinois flight deals and tips

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

Best Price Found	$403
Fastest flight time	22h 43m
Direct flights	None

The best one-way flight to Illinois from Sydney in the past 72 hours is $403. The best round-trip flight deal from Sydney to Illinois found on momondo in the last 72 hours is $927.

The fastest flight from Sydney to Illinois takes 22h 43m

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

Search flight deals

Frequently asked questions about flying from Sydney to Illinois

When did momondo last update prices for flights from Sydney Kingsford Smith Airport to Illinois?
Prices for flights from Sydney Kingsford Smith Airport to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Sydney Kingsford Smith Airport to Illinois?
As of September 2026, there is 1 operator available to choose from for flights from Sydney Kingsford Smith Airport to Illinois.
How old do you have to be to fly from Sydney Kingsford Smith Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Sydney Kingsford Smith Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Sydney to Illinois

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

Airline	Rating	Free Cancellation	Price
Qantas Airways	PriceFrom $970	Free Cancellation	Rating 7.5 1,093 reviews		Search Qantas Airways flights

Why use momondo?

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

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 Sydney to Illinois for you.

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

Flights from Sydney to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Sydney to Illinois flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes. momondo can track prices for Sydney to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.