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Cheap flights from Sydney to Illinois from $860

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 16/7. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
9 Aug — 16 Aug1
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 10 July 2026.

Wed 5/813:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Wed 12/809:20
ORD
-
SYD
3 stops35h 30m
Multiple Airlines
Deal found 6/7$1,307
Mon 3/813:15
SYD
-
MDW
3 stops36h 52m
Multiple Airlines
Mon 10/811:06
MDW
-
SYD
3 stops44h 19m
Multiple Airlines
Deal found 6/7$1,349
Mon 27/706:15
SYD
-
ORD
2 stops39h 02m
Multiple Airlines
Tue 1/909:20
ORD
-
SYD
3 stops35h 30m
Multiple Airlines
Deal found 6/7$1,381
Mon 27/706:15
SYD
-
ORD
2 stops39h 02m
Multiple Airlines
Tue 11/807:29
ORD
-
SYD
3 stops37h 21m
Multiple Airlines
Deal found 6/7$1,392
Mon 3/813:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Mon 10/807:29
ORD
-
SYD
3 stops47h 56m
Multiple Airlines
Deal found 6/7$1,398
Tue 14/717:50
SYD
-
STL
1 stop21h 09m
Qantas Airways
Tue 25/806:00
STL
-
SYD
1 stop34h 30m
Qantas Airways
Deal found 7/7$1,418
Tue 28/713:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Wed 12/809:20
ORD
-
SYD
3 stops35h 30m
Multiple Airlines
Deal found 7/7$1,434
Tue 14/709:10
SYD
-
STL
2 stops22h 18m
American Airlines
Tue 25/806:00
STL
-
SYD
2 stops36h 45m
American Airlines
Deal found 7/7$1,453
Tue 14/709:10
SYD
-
STL
1 stop29h 49m
Qantas Airways
Sat 22/806:00
STL
-
SYD
1 stop34h 05m
Qantas Airways
Deal found 7/7$1,483
Tue 14/709:10
SYD
-
STL
1 stop29h 49m
Qantas Airways
Fri 21/815:32
STL
-
SYD
1 stop24h 23m
Qantas Airways
Deal found 7/7$1,484
Tue 14/709:10
SYD
-
STL
2 stops22h 18m
American Airlines
Fri 21/815:32
STL
-
SYD
2 stops24h 33m
American Airlines
Deal found 7/7$1,490
Sun 13/913:15
SYD
-
MDW
3 stops36h 43m
Multiple Airlines
Sun 20/907:25
MDW
-
SYD
3 stops48h 00m
Multiple Airlines
Deal found 6/7$1,497

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 10 July 2026.

Round-trip from

$1,307

One-way from

$860

Popular in

May

Cheapest in

August

Average price

$1,948
5/8-12/8
  • 5/8-12/8
  • 5 total stops
  • 67h 32m total
  • Sydney to Illinois
Search Deals
American Airlines
  • American Airlines
  • 16/7
  • 1 total stop
  • 29h 49m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($201 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($35 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 10 July 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

Thu 10/9

09:10-23:30

1 stop29h 20m

Lambert-St Louis

Sun 13/9

17:11-07:05

2 stops22h 54m

$1,548

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/8

09:10-20:26

2 stops26h 16m

Lambert-St Louis

Sun 16/8

14:29-07:30

2 stops26h 01m

$1,561

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 10/9

10:20-17:59

1 stop22h 39m

Lambert-St Louis

Sun 13/9

08:42-06:55

1 stop31h 13m

$1,575

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 12/8

10:20-18:39

1 stop23h 19m

Lambert-St Louis

Sun 16/8

08:42-06:55

1 stop31h 13m

$1,577

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 22/8

09:10-18:05

2 stops23h 55m

Lambert-St Louis

Sat 29/8

13:25-07:05

2 stops26h 40m

$1,580
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 9/9

12:00-18:04

1 stop21h 04m

Lambert-St Louis

Sat 3/10

17:00-06:55

1 stop21h 55m

$1,594

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 9/9

09:10-16:40

2 stops22h 30m

Lambert-St Louis

Sat 3/10

15:34-06:55

1 stop23h 21m

$1,611

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 10/9

09:10-23:30

1 stop29h 20m

Lambert-St Louis

Sun 13/9

06:00-07:05

1 stop34h 05m

$1,613

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 18/11

11:20-09:23

2 stops39h 03m

Chicago O'Hare Intl

Thu 19/11

15:40-09:05

1 stop24h 25m

$1,627

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 6/8

06:25-23:30

2 stops32h 05m

Chicago O'Hare Intl

Wed 19/8

15:54-08:50

2 stops25h 56m

$1,688

Flights are sorted by cheapest return flights first.

Deals found on 7/7

Showing 1-10 of 52 resultsSorted by cheapest first
1
2
3
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6

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

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 $674). Flying from Sydney to Illinois in February is currently the most expensive (average of $1,247). 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?

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 10 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.

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 10 July 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
650 reviews
Check prices

Food

7.4

Entertainment

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.
Air New Zealand
8.0
Very Good
650 reviews
Air New Zealand
8.0
Very Good
650 reviews
Check prices

Food

7.4

Entertainment

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.
Qantas Airways
7.5
Good
1,059 reviews
Air New Zealand
8.0
Very Good
650 reviews
Check prices

Food

7.4

Entertainment

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.
United Airlines
7.4
Good
9,966 reviews
Air New Zealand
8.0
Very Good
650 reviews
Check prices

Food

7.4

Entertainment

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.
American Airlines
7.1
Good
11,798 reviews
Air New Zealand
8.0
Very Good
650 reviews
Check prices

Food

7.4

Entertainment

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.
Air Canada
7.1
Good
11,323 reviews
Air New Zealand
8.0
Very Good
650 reviews
Check prices

Food

7.4

Entertainment

7.4

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

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 39m. 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 $674). Flying from Sydney to Illinois in February is currently the most expensive (average of $1,247). 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 10 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,092Average$1,708FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,272Average$1,768FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,273Average$1,648FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$1,425Average$1,851FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air New ZealandCheapest$1,435Average$1,530FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
ANACheapest$1,540Average$2,014FlexibilityNo 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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