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Cheap flights from Sydney to Illinois from $388

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Sydney to Illinois departing on 10/15. 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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Find the cheapest flights from Sydney to Illinois

Cheap round-trip flights

American Airlines Logo
9:10 am - 7:09 pmSYD-STL
24h 59m2 stops
American Airlines Logo
3:59 pm - 9:00 amSTL-SYD
24h 01m2 stops
$814American Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
American Airlines Logo
9:10 am - 8:18 pmSYD-STL
26h 08m2 stops
American Airlines Logo
11:39 am - 9:00 amSTL-SYD
28h 21m2 stops
$818American Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
Air Canada Logo
9:20 am - 9:09 amSYD-ORD
38h 49m2 stops
Air Canada Logo
3:40 pm - 9:40 pmORD-SYD
39h 00m2 stops
$818Air Canada
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Mon, Aug 11 - Wed, Aug 20
United Airlines Logo
9:30 am - 6:58 pmSYD-STL
24h 28m2 stops
United Airlines Logo
11:05 am - 6:55 amSTL-SYD
28h 50m2 stops
$830United Airlines
Find Deal
Sun, Sep 14 - Sun, Sep 21
United Airlines Logo
10:20 am - 4:45 pmSYD-STL
21h 25m1 stop
United Airlines Logo
11:20 am - 7:00 amSTL-SYD
26h 40m1 stop
$834United Airlines
Find Deal
Mon, Aug 18 - Sat, Nov 8
Air Canada Logo
10:20 am - 3:00 pmSYD-ORD
20h 40m1 stop
Air Canada Logo
7:15 am - 8:35 amORD-SYD
33h 20m2 stops
$841Air Canada
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Tue, Oct 21 - Wed, Oct 29
Logo
2:45 pm - 11:04 pmSYD-ORD
24h 19m2 stops
Logo
6:20 am - 12:45 pmORD-SYD
38h 25m2 stops
$867
Find Deal
Sat, Oct 11 - Sun, Oct 12
Logo
1:45 pm - 11:13 pmSYD-ORD
24h 28m2 stops
Logo
7:00 am - 11:45 amORD-SYD
37h 45m2 stops
$905
Find Deal
Sat, Sep 13 - Sat, Sep 20
Qantas Airways Logo
10:10 am - 11:05 pmSYD-STL
28h 55m1 stop
Qantas Airways Logo
6:25 am - 7:25 amSTL-SYD
32h 00m1 stop
$1,081Qantas Airways
Find Deal
Mon, Oct 13 - Sun, Dec 14
Qantas Airways Logo
10:10 am - 11:05 pmSYD-STL
28h 55m1 stop
Qantas Airways Logo
6:25 am - 7:25 amSTL-SYD
32h 00m1 stop
$1,130Qantas Airways
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Mon, Oct 13 - Mon, Dec 15

Air Canada flights from Sydney to Illinois

Our best Air Canada deals on Sydney to Illinois flight tickets
Air Canada
Aug 7
SYD9:20 amSydney Kingsford Smith
20h 34m
1 stop
ORD2:54 pmChicago O'Hare Intl
Aug 20
ORD10:40 amChicago O'Hare Intl
29h 40m
2 stops
SYD7:20 amSydney Kingsford Smith
$803
Find similar
Air Canada
Aug 7
SYD9:20 amSydney Kingsford Smith
49h 56m
2 stops
ORD8:16 pmChicago O'Hare Intl
Aug 20
ORD8:55 amChicago O'Hare Intl
31h 25m
2 stops
SYD7:20 amSydney Kingsford Smith
$809
Find similar
Air Canada
Aug 11
SYD9:20 amSydney Kingsford Smith
38h 49m
2 stops
ORD9:09 amChicago O'Hare Intl
Aug 20
ORD3:40 pmChicago O'Hare Intl
39h 00m
2 stops
SYD9:40 pmSydney Kingsford Smith
$818
Find similar

American Airlines flights from Sydney to Illinois

Our best American Airlines deals on Sydney to Illinois flight tickets
American Airlines
Aug 18
SYD9:10 amSydney Kingsford Smith
24h 59m
2 stops
STL7:09 pmLambert-St Louis
Nov 8
STL3:59 pmLambert-St Louis
24h 01m
2 stops
SYD9:00 amSydney Kingsford Smith
$814
Find similar
American Airlines
Aug 18
SYD9:10 amSydney Kingsford Smith
26h 08m
2 stops
STL8:18 pmLambert-St Louis
Nov 8
STL11:39 amLambert-St Louis
28h 21m
2 stops
SYD9:00 amSydney Kingsford Smith
$818
Find similar
American Airlines
Aug 18
SYD9:10 amSydney Kingsford Smith
21h 39m
2 stops
STL3:49 pmLambert-St Louis
Nov 8
STL9:38 amLambert-St Louis
30h 22m
2 stops
SYD9:00 amSydney Kingsford Smith
$820
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Sydney to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Sydney to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

9:10 am-7:09 pm

2 stops24h 59m

Lambert-St Louis

Sat 11/8

3:59 pm-9:00 am

2 stops24h 01m

$814

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

9:10 am-8:18 pm

2 stops26h 08m

Lambert-St Louis

Sat 11/8

11:39 am-9:00 am

2 stops28h 21m

$818

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 8/11

9:20 am-9:09 am

2 stops38h 49m

Chicago O'Hare Intl

Wed 8/20

3:40 pm-9:40 pm

2 stops39h 00m

$818

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 9/14

9:30 am-6:58 pm

2 stops24h 28m

Lambert-St Louis

Sun 9/21

11:05 am-6:55 am

2 stops28h 50m

$830

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/18

10:20 am-4:45 pm

1 stop21h 25m

Lambert-St Louis

Sat 11/8

11:20 am-7:00 am

1 stop26h 40m

$834

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 10/21

10:20 am-3:00 pm

1 stop20h 40m

Chicago O'Hare Intl

Wed 10/29

7:15 am-8:35 am

2 stops33h 20m

$841

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 10/11

2:45 pm-11:04 pm

2 stops24h 19m

Chicago O'Hare Intl

Sun 10/12

6:20 am-12:45 pm

2 stops38h 25m

$867

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 9/13

1:45 pm-11:13 pm

2 stops24h 28m

Chicago O'Hare Intl

Sat 9/20

7:00 am-11:45 am

2 stops37h 45m

$905

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/13

10:10 am-11:05 pm

1 stop28h 55m

Lambert-St Louis

Sun 12/14

6:25 am-7:25 am

1 stop32h 00m

$1,081

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 10/13

10:10 am-11:05 pm

1 stop28h 55m

Lambert-St Louis

Mon 12/15

6:25 am-7:25 am

1 stop32h 00m

$1,130

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

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

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Sydney is in February. Flight prices, which tend to average around $747, 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 February, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $748.

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

The cheapest day to depart from Sydney to Illinois is on a Thursday when prices can be found for as low as $1,103. Flights from Sydney to Illinois on a Monday will generally be more expensive and average around $1,626. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Sydney to Illinois during this time can be as low as $1,141. Flights in the morning are often more expensive with an average ticket price of $1,365.

How far in advance should I book a flight 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 $1,032 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 $840 on momondo.

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

$388

Fastest flight time

19h 34m

Direct flights

None

Airports in Illinois

3 airports
The best one-way flight to Illinois from Sydney in the past 72 hours is $388. The best round-trip flight deal from Sydney to Illinois found on momondo in the last 72 hours is $814.
The fastest flight from Sydney to Illinois takes 19h 34m
There are no direct flights from Sydney to Illinois. Popular non-direct routes for this connection are Sydney Kingsford Smith Airport - Chicago O'Hare Intl Airport and Sydney Kingsford Smith Airport - Lambert-St Louis Airport.
There are 3 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL)
Search flight deals

  • 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?

  • 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 AirwaysPriceFrom $631Free CancellationRating
7.5
887 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $884Free CancellationRating
7.2
10,000 reviews
Search American Airlines 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.

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