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Cheap flights from Sydney to Illinois from $461

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 3/16. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Air New Zealand Logo
9:55 am - 8:23 pm
SYD
-
ORD
26h 28m
2 stops
Air New Zealand Logo
4:00 pm - 10:30 am
ORD
-
SYD
26h 30m
2 stops
$1,037Air New Zealand
Tue, Mar 10 - Tue, Mar 17
American Airlines Logo
11:20 am - 9:12 pm
SYD
-
STL
26h 52m
2 stops
American Airlines Logo
12:27 pm - 7:05 am
STL
-
SYD
27h 38m
2 stops
$1,039American Airlines
Tue, Mar 3 - Mon, Apr 13
Multiple Airlines Logo
2:00 pm - 4:49 am
SYD
-
ORD
30h 49m
2 stops
Multiple Airlines Logo
7:39 pm - 7:25 am
ORD
-
SYD
43h 46m
1 stop
$1,043Multiple Airlines
Wed, Mar 11 - Wed, Mar 18
Delta Logo
10:40 am - 7:39 pm
SYD
-
STL
25h 59m
2 stops
Delta Logo
12:23 pm - 6:50 am
STL
-
SYD
27h 27m
2 stops
$1,055Delta
Tue, Mar 3 - Mon, Apr 13
Delta Logo
1:15 pm - 11:25 pm
SYD
-
STL
26h 10m
2 stops
Delta Logo
12:28 pm - 6:05 am
STL
-
SYD
25h 37m
2 stops
$1,083Delta
Thu, Mar 12 - Thu, Mar 19
Multiple Airlines Logo
2:00 pm - 7:54 am
SYD
-
ORD
34h 54m
3 stops
Multiple Airlines Logo
8:59 am - 12:35 pm
ORD
-
SYD
34h 36m
3 stops
$1,129Multiple Airlines
Sat, Feb 14 - Sun, Mar 1
Air New Zealand Logo
9:55 am - 11:26 pm
SYD
-
ORD
30h 31m
2 stops
Air New Zealand Logo
2:33 pm - 10:30 am
ORD
-
SYD
26h 57m
2 stops
$1,134Air New Zealand
Sat, Feb 14 - Sun, Mar 1
Qantas Airways Logo
11:20 am - 2:53 pm
SYD
-
ORD
20h 33m
1 stop
Qantas Airways Logo
4:45 pm - 9:00 am
ORD
-
SYD
23h 15m
1 stop
$1,179Qantas Airways
Mon, Feb 16 - Tue, Mar 3
United Airlines Logo
11:50 am - 2:43 pm
SYD
-
ORD
19h 53m
1 stop
United Airlines Logo
2:35 pm - 9:05 am
ORD
-
SYD
25h 30m
2 stops
$1,193United Airlines
Mon, Feb 16 - Wed, Mar 4
United Airlines Logo
12:10 pm - 2:45 pm
SYD
-
ORD
19h 35m
1 stop
United Airlines Logo
2:35 pm - 9:05 am
ORD
-
SYD
25h 30m
2 stops
$1,195United Airlines
Mon, Feb 16 - Tue, Mar 3

Qantas Airways flights from Sydney to Illinois

Our best Qantas Airways deals on Sydney to Illinois flight tickets
Qantas Airways
Feb 16
SYD11:20 amSydney Kingsford Smith
20h 33m
1 stop
ORD2:53 pmChicago O'Hare Intl
Mar 3
ORD4:45 pmChicago O'Hare Intl
23h 15m
1 stop
SYD9:00 amSydney Kingsford Smith
$1,179
Qantas Airways
Mar 7
SYD11:20 amSydney Kingsford Smith
20h 33m
1 stop
ORD2:53 pmChicago O'Hare Intl
Mar 28
ORD9:30 pmChicago O'Hare Intl
42h 35m
1 stop
SYD8:05 amSydney Kingsford Smith
$1,241
Qantas Airways
Jul 10
SYD9:10 amSydney Kingsford Smith
21h 38m
1 stop
ORD3:48 pmChicago O'Hare Intl
Jul 26
ORD7:00 pmChicago O'Hare Intl
21h 05m
1 stop
SYD7:05 amSydney Kingsford Smith
$1,344

United Airlines flights from Sydney to Illinois

Our best United Airlines deals on Sydney to Illinois flight tickets
United Airlines
Feb 16
SYD11:50 amSydney Kingsford Smith
19h 53m
1 stop
ORD2:43 pmChicago O'Hare Intl
Mar 4
ORD2:35 pmChicago O'Hare Intl
25h 30m
2 stops
SYD9:05 amSydney Kingsford Smith
$1,193
United Airlines
Feb 16
SYD12:10 pmSydney Kingsford Smith
19h 35m
1 stop
ORD2:45 pmChicago O'Hare Intl
Mar 3
ORD2:35 pmChicago O'Hare Intl
25h 30m
2 stops
SYD9:05 amSydney Kingsford Smith
$1,195
United Airlines
Feb 23
SYD11:50 amSydney Kingsford Smith
27h 24m
1 stop
STL10:14 pmLambert-St Louis
Mar 2
STL4:28 pmLambert-St Louis
21h 32m
1 stop
SYD7:00 amSydney Kingsford Smith
$1,213

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 January 27, 2026.
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

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 3/10

9:55 am-8:23 pm

2 stops26h 28m

Chicago O'Hare Intl

Tue 3/17

4:00 pm-10:30 am

2 stops26h 30m

$1,037

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 3/3

11:20 am-9:12 pm

2 stops26h 52m

Lambert-St Louis

Mon 4/13

12:27 pm-7:05 am

2 stops27h 38m

$1,039

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 3/11

2:00 pm-4:49 am

2 stops30h 49m

Chicago O'Hare Intl

Wed 3/18

7:39 pm-7:25 am

1 stop43h 46m

$1,043

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 3/3

10:40 am-7:39 pm

2 stops25h 59m

Lambert-St Louis

Mon 4/13

12:23 pm-6:50 am

2 stops27h 27m

$1,055

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 3/12

1:15 pm-11:25 pm

2 stops26h 10m

Lambert-St Louis

Thu 3/19

12:28 pm-6:05 am

2 stops25h 37m

$1,083

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 2/14

2:00 pm-7:54 am

3 stops34h 54m

Chicago O'Hare Intl

Sun 3/1

8:59 am-12:35 pm

3 stops34h 36m

$1,129

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 2/14

9:55 am-11:26 pm

2 stops30h 31m

Chicago O'Hare Intl

Sun 3/1

2:33 pm-10:30 am

2 stops26h 57m

$1,134

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/16

11:20 am-2:53 pm

1 stop20h 33m

Chicago O'Hare Intl

Tue 3/3

4:45 pm-9:00 am

1 stop23h 15m

$1,179

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/16

11:50 am-2:43 pm

1 stop19h 53m

Chicago O'Hare Intl

Wed 3/4

2:35 pm-9:05 am

2 stops25h 30m

$1,193

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/16

12:10 pm-2:45 pm

1 stop19h 35m

Chicago O'Hare Intl

Tue 3/3

2:35 pm-9:05 am

2 stops25h 30m

$1,195

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 March. Flight prices, which tend to average around $741, 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 March, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $755.

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 $958 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 $762 on momondo.

Can stopping save me money on Sydney to Illinois flights?

You could potentially save up to 9% 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

Fastest flight time

19h 45m

Direct flights

None
The fastest flight from Sydney to Illinois takes 19h 45m
There are no direct flights from Sydney to Illinois. There are no popular flight routes from Sydney to Illinois.
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
978 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.

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