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Cheap flights from Sydney to Illinois from $922

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
31 May — 7 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Sydney to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Sydney to Illinois
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 May 2026.

Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Multiple Airlines
Thu 28/516:48
STL
-
SYD
2 stops23h 32m
Multiple Airlines
Deal found 26/4$1,426
Wed 10/609:20
SYD
-
STL
2 stops53h 37m
Air Canada
Wed 17/608:40
STL
-
SYD
2 stops31h 40m
Air Canada
Deal found 27/4$1,485
Mon 10/809:20
SYD
-
STL
2 stops50h 19m
Air Canada
Thu 3/905:10
STL
-
SYD
2 stops35h 10m
Air Canada
Deal found 28/4$1,510
Thu 11/609:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 18/616:48
STL
-
SYD
2 stops23h 32m
Air Canada
Deal found 27/4$1,531
Wed 20/509:20
SYD
-
STL
2 stops26h 05m
Air Canada
Thu 28/513:05
STL
-
SYD
3 stops51h 15m
Air Canada
Deal found 26/4$1,534
Tue 6/1012:45
SYD
-
ORD
2 stops32h 20m
ANA
Mon 2/1116:25
ORD
-
SYD
1 stop25h 05m
ANA
Deal found 27/4$1,560
Mon 18/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Tue 2/607:40
ORD
-
SYD
2 stops32h 50m
Multiple Airlines
Deal found 28/4$1,674
Mon 4/513:15
SYD
-
ORD
3 stops48h 58m
Multiple Airlines
Fri 8/506:55
ORD
-
SYD
3 stops48h 15m
Multiple Airlines
Deal found 28/4$1,720
Tue 12/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Tue 2/621:37
ORD
-
SYD
2 stops42h 53m
Multiple Airlines
Deal found 28/4$1,794
Tue 19/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Wed 3/607:40
ORD
-
SYD
2 stops32h 50m
Multiple Airlines
Deal found 29/4$1,819
Tue 9/617:50
SYD
-
ORD
2 stops31h 09m
Multiple Airlines
Tue 16/616:06
ORD
-
SYD
2 stops24h 24m
Multiple Airlines
Deal found 27/4$1,826
Mon 20/717:50
SYD
-
ORD
1 stop27h 27m
Multiple Airlines
Mon 10/809:28
ORD
-
SYD
2 stops31h 02m
Multiple Airlines
Deal found 28/4$1,827

Find flight deals from Sydney to Illinois

Keep the following information in mind while searching for Sydney to Illinois flight deals. Data was last updated 1 May 2026.

Round-trip from

$1,426

One-way from

$922

Popular in

April

Cheapest in

August

Average price

$1,677
20/5-28/5
  • 20/5-28/5
  • 4 total stops
  • 65h 18m total
  • Sydney to Illinois
Search Deals
9/10
  • 9/10
  • 3 total stops
  • 52h 55m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($199 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($69 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise 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, Cheapflights users made 647,157 searches. Data last updated 1 May 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

Cheapest return flight

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/6

09:20-23:57

2 stops29h 37m

Lambert-St Louis

Wed 17/6

08:40-07:20

2 stops55h 40m

$1,490

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 10/6

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Wed 17/6

13:13-07:00

2 stops26h 47m

$1,690

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 2/6

15:40-08:35

1 stop31h 55m

Chicago O'Hare Intl

Tue 23/6

09:30-16:50

2 stops40h 20m

$2,095

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 4/6

09:15-18:33

2 stops24h 18m

Chicago Midway

Wed 12/8

13:00-06:50

2 stops26h 50m

$2,353

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 2/6

20:45-13:14

2 stops31h 29m

Chicago O'Hare Intl

Fri 12/6

18:42-18:50

2 stops33h 08m

$2,399

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 13/7

09:10-14:27

1 stop20h 17m

Chicago O'Hare Intl

Mon 10/8

19:00-07:05

1 stop21h 05m

$2,418

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 5/6

09:15-16:51

2 stops22h 36m

Chicago O'Hare Intl

Wed 12/8

18:30-06:50

1 stop21h 20m

$2,423

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 22/6

09:15-21:57

2 stops27h 42m

Chicago O'Hare Intl

Sun 19/7

18:30-06:50

1 stop21h 20m

$2,425

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 18/6

09:15-18:31

2 stops24h 16m

Chicago Midway

Tue 7/7

11:05-06:50

2 stops28h 45m

$2,427

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Tue 2/6

09:15-17:56

2 stops23h 41m

Chicago Midway

Fri 12/6

12:45-06:50

2 stops27h 05m

$2,434

Flights are sorted by cheapest return flights first.

Deals found on 30/4

Showing 1-10 of 40 resultsSorted by cheapest first
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Best time to book a flight from Sydney to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Sydney with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Sydney to Illinois

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

To ensure you get the cheapest price possible for a flight from Sydney to Illinois, you should look to book at least 36 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Sydney to Illinois?

Currently, December is the cheapest month in which you can book a flight from Sydney to Illinois (average of $650). Flying from Sydney to Illinois in February is currently the most expensive (average of $1,201). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Sydney to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 1 May 2026.
Read through reviews of airlines operating flights from Sydney to Illinois, such as Air New Zealand,Qantas Airways, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air New Zealand
8.0
Very Good
638 reviews
Check prices

Crew

8.5

Entertainment

7.4

Food

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
Air New Zealand
8.0
Very Good
638 reviews
Air New Zealand
8.0
Very Good
638 reviews
Check prices

Crew

8.5

Entertainment

7.4

Food

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
Qantas Airways
7.5
Good
1,028 reviews
Air New Zealand
8.0
Very Good
638 reviews
Check prices

Crew

8.5

Entertainment

7.4

Food

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
United Airlines
7.4
Good
9,677 reviews
Air New Zealand
8.0
Very Good
638 reviews
Check prices

Crew

8.5

Entertainment

7.4

Food

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
American Airlines
7.1
Good
11,684 reviews
Air New Zealand
8.0
Very Good
638 reviews
Check prices

Crew

8.5

Entertainment

7.4

Food

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
Air Canada
7.1
Good
10,983 reviews
Air New Zealand
8.0
Very Good
638 reviews
Check prices

Crew

8.5

Entertainment

7.4

Food

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding

Related info for your journey

Find useful and relevant information for your journey from Sydney to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Sydney to Illinois?

    If you book a flight to Illinois from Sydney, you will be flying from Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 7.5 km from the centre of Sydney.

  • How long is the flight from Sydney to Illinois?

    Departing from Sydney to Illinois will take you 22h 57m. The distance between Sydney and Illinois is about 14571 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Sydney to Illinois?

    The most popular route from Sydney to Illinois is Sydney Kingsford Smith - Chicago O'Hare Intl. You may also consider Sydney Kingsford Smith - Chicago Midway or Sydney Kingsford Smith - Lambert-St Louis.

  • Can I find deals for flights from Sydney to Illinois that include hotel bookings?

    Yes. In addition to deals on Sydney to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Sydney to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to Illinois.

  • Can I find deals for business class flights from Sydney to Illinois?

    Yes. Cheapflights offers flight deals from Sydney to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Sydney to Illinois?

    Currently, December is the cheapest month in which you can book a flight from Sydney to Illinois (average of $650). Flying from Sydney to Illinois in February is currently the most expensive (average of $1,201). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 6 airlines flying from Sydney to Illinois

Discover the top 6 airlines that operate flights from Sydney to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 1 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,052Average$1,706FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapest$1,083Average$1,129FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,225Average$1,625FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air New ZealandCheapest$1,314Average$1,468FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
United AirlinesCheapest$1,373Average$1,899FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
ANACheapest$1,458Average$1,578FlexibilityNo cancel feeOn-time80%
Search ANA flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Sydney to Illinois?

When you search for this flight from Sydney to Illinois, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Sydney to Illinois?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Sydney to Illinois.

Can Cheapflights find flights from Sydney to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Sydney to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Sydney to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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