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Cheap flights from Sydney to Illinois from $871

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 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
11 Jun — 18 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 12 May 2026.

Tue 8/909:10
SYD
-
ORD
2 stops25h 42m
American Airlines
Mon 21/919:01
ORD
-
SYD
1 stop21h 04m
American Airlines
Deal found 11/5$1,426
Tue 12/509:10
SYD
-
STL
2 stops23h 11m
American Airlines
Wed 20/514:37
STL
-
SYD
2 stops25h 28m
American Airlines
Deal found 8/5$1,433
Wed 12/810:20
SYD
-
STL
1 stop23h 19m
United Airlines
Sat 5/917:59
STL
-
SYD
2 stops45h 56m
United Airlines
Deal found 11/5$1,443
Tue 12/509:10
SYD
-
STL
2 stops23h 11m
Qantas Airways
Wed 20/506:21
STL
-
SYD
1 stop33h 44m
Qantas Airways
Deal found 8/5$1,444
Thu 10/909:15
SYD
-
ORD
2 stops24h 24m
Delta
Mon 21/915:50
ORD
-
SYD
2 stops24h 00m
Delta
Deal found 11/5$1,452
Wed 20/509:10
SYD
-
STL
2 stops25h 20m
American Airlines
Thu 28/513:19
STL
-
SYD
2 stops26h 46m
American Airlines
Deal found 9/5$1,483
Sat 31/1011:15
SYD
-
ORD
1 stop34h 46m
American Airlines
Wed 4/1110:15
ORD
-
SYD
1 stop26h 55m
American Airlines
Deal found 11/5$1,484
Thu 10/909:10
SYD
-
ORD
1 stop22h 35m
American Airlines
Thu 24/919:01
ORD
-
SYD
1 stop21h 04m
American Airlines
Deal found 9/5$1,494
Mon 19/1010:10
SYD
-
ORD
1 stop22h 40m
American Airlines
Sat 31/1015:14
ORD
-
SYD
1 stop24h 46m
American Airlines
Deal found 8/5$1,495
Fri 11/909:10
SYD
-
ORD
1 stop21h 40m
American Airlines
Sun 20/919:01
ORD
-
SYD
1 stop21h 04m
American Airlines
Deal found 11/5$1,496
Thu 1/1009:10
SYD
-
ORD
1 stop30h 19m
American Airlines
Fri 9/1020:25
ORD
-
SYD
1 stop43h 05m
American Airlines
Deal found 9/5$1,503
Thu 10/909:10
SYD
-
ORD
1 stop22h 35m
Qantas Airways
Thu 24/915:52
ORD
-
SYD
1 stop24h 13m
Qantas Airways
Deal found 9/5$1,506

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 12 May 2026.

Round-trip from

$1,426

One-way from

$871

Popular in

December

Cheapest in

August

Average price

$1,610
American Airlines
  • American Airlines
  • 8/9-21/9
  • 3 total stops
  • 46h 46m total
  • Sydney to Illinois
Search Deals
24/8
  • 24/8
  • 2 total stops
  • 32h 04m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($66 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($27 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 12 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 12/8

09:30-17:06

2 stops22h 36m

Lambert-St Louis

Sat 5/9

17:59-06:55

2 stops45h 56m

$1,443

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/6

09:20-20:25

2 stops50h 05m

Lambert-St Louis

Sun 14/6

13:05-07:20

2 stops51h 15m

$1,571

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/6

09:20-21:10

2 stops26h 50m

Lambert-St Louis

Sun 7/6

08:40-07:20

2 stops31h 40m

$1,685

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/8

09:20-14:02

2 stops43h 42m

Lambert-St Louis

Sat 5/9

12:10-07:20

3 stops52h 10m

$1,745

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 8/6

06:25-16:41

2 stops25h 16m

Chicago O'Hare Intl

Mon 15/6

15:50-06:55

1 stop24h 05m

$2,093

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 11/6

09:10-15:49

1 stop21h 39m

Chicago O'Hare Intl

Wed 22/7

15:21-09:45

2 stops27h 24m

$2,153

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 2/6

20:45-18:50

2 stops37h 05m

Chicago O'Hare Intl

Tue 23/6

17:42-18:50

2 stops34h 08m

$2,178

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 30/5

20:45-13:14

2 stops31h 29m

Chicago O'Hare Intl

Fri 12/6

17:42-18:50

2 stops34h 08m

$2,294

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 22/5

20:45-18:50

2 stops37h 05m

Chicago O'Hare Intl

Sun 31/5

19:49-18:50

2 stops32h 01m

$2,337

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 11/6

20:45-05:00

2 stops23h 15m

Chicago O'Hare Intl

Thu 23/7

17:42-18:50

2 stops34h 08m

$2,366

Flights are sorted by cheapest return flights first.

Deals found on 8/5

Showing 1-10 of 45 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 $646). Flying from Sydney to Illinois in February is currently the most expensive (average of $1,194). 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 12 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
642 reviews
Check prices

Entertainment

7.4

Crew

8.5

Comfort

8.0

Boarding

8.2

Food

7.4

Overall

8.0

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
642 reviews
Air New Zealand
8.0
Very Good
642 reviews
Check prices

Entertainment

7.4

Crew

8.5

Comfort

8.0

Boarding

8.2

Food

7.4

Overall

8.0

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
1,035 reviews
Air New Zealand
8.0
Very Good
642 reviews
Check prices

Entertainment

7.4

Crew

8.5

Comfort

8.0

Boarding

8.2

Food

7.4

Overall

8.0

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
9,701 reviews
Air New Zealand
8.0
Very Good
642 reviews
Check prices

Entertainment

7.4

Crew

8.5

Comfort

8.0

Boarding

8.2

Food

7.4

Overall

8.0

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
11,662 reviews
Air New Zealand
8.0
Very Good
642 reviews
Check prices

Entertainment

7.4

Crew

8.5

Comfort

8.0

Boarding

8.2

Food

7.4

Overall

8.0

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
11,022 reviews
Air New Zealand
8.0
Very Good
642 reviews
Check prices

Entertainment

7.4

Crew

8.5

Comfort

8.0

Boarding

8.2

Food

7.4

Overall

8.0

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 36m. 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 $646). Flying from Sydney to Illinois in February is currently the most expensive (average of $1,194). 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 12 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,046Average$1,708FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapest$1,077Average$1,123FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,218Average$1,634FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air New ZealandCheapest$1,306Average$1,460FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
United AirlinesCheapest$1,365Average$1,874FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
ANACheapest$1,450Average$1,708FlexibilityNo 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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