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Cheap flights from Sydney to Illinois from $649

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 29/8. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
9 May — 16 May1
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 9 April 2026.

Sun 24/513:15
SYD
-
ORD
2 stops31h 44m
Multiple Airlines
Sun 31/507:15
ORD
-
SYD
2 stops37h 35m
Multiple Airlines
Deal found 9/4$1,580
Wed 3/613:20
SYD
-
ORD
2 stops31h 39m
Multiple Airlines
Fri 12/607:15
ORD
-
SYD
2 stops37h 35m
Multiple Airlines
Deal found 5/4$1,606
Mon 27/413:15
SYD
-
ORD
2 stops31h 35m
Multiple Airlines
Tue 12/512:40
ORD
-
SYD
3 stops42h 30m
Multiple Airlines
Deal found 7/4$1,607
Mon 27/706:00
SYD
-
ORD
2 stops39h 19m
Multiple Airlines
Tue 4/806:55
ORD
-
SYD
3 stops48h 15m
Multiple Airlines
Deal found 7/4$1,666
Tue 28/417:50
SYD
-
ORD
1 stop20h 37m
Multiple Airlines
Wed 13/520:56
ORD
-
SYD
2 stops47h 54m
Multiple Airlines
Deal found 8/4$1,704
Mon 18/509:20
SYD
-
STL
2 stops26h 05m
Air Canada
Mon 8/616:48
STL
-
SYD
2 stops23h 32m
Air Canada
Deal found 9/4$1,715
Wed 20/509:20
SYD
-
STL
2 stops26h 05m
Air Canada
Thu 11/614:15
STL
-
SYD
2 stops26h 05m
Air Canada
Deal found 9/4$1,726
Wed 29/417:50
SYD
-
ORD
1 stop20h 37m
Multiple Airlines
Thu 14/506:15
ORD
-
SYD
2 stops38h 35m
Multiple Airlines
Deal found 9/4$1,736
Thu 7/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Thu 28/520:46
ORD
-
SYD
2 stops48h 04m
Multiple Airlines
Deal found 9/4$1,738
Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 28/513:38
STL
-
SYD
2 stops26h 42m
Air Canada
Deal found 7/4$1,746
Thu 7/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Mon 11/517:59
STL
-
SYD
2 stops46h 21m
Air Canada
Deal found 8/4$1,789
Fri 15/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Tue 9/608:40
STL
-
SYD
2 stops31h 40m
Air Canada
Deal found 8/4$1,792

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 9 April 2026.

Round-trip from

$1,580

One-way from

$649

Popular in

April

Cheapest in

August

Average price

$2,257
24/5-31/5
  • 24/5-31/5
  • 4 total stops
  • 69h 19m total
  • Sydney to Illinois
Search Deals
29/8
  • 29/8
  • 3 total stops
  • 53h 29m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($188 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($72 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 9 April 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

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 28/4

17:50-23:27

1 stop20h 37m

Chicago O'Hare Intl

Wed 13/5

20:56-11:50

2 stops47h 54m

$1,704

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 15/5

07:00-19:30

2 stops27h 30m

Lambert-St Louis

Mon 8/6

06:35-07:05

1 stop33h 30m

$1,877

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 16/5

06:00-23:59

2 stops32h 59m

Lambert-St Louis

Mon 8/6

06:35-07:05

1 stop33h 30m

$1,885

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 19/5

09:30-16:39

2 stops22h 09m

Lambert-St Louis

Tue 16/6

13:38-07:00

2 stops26h 22m

$2,052
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 19/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Tue 9/6

19:23-06:55

1 stop20h 32m

$2,058

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 7/5

20:45-13:13

3 stops31h 28m

Chicago O'Hare Intl

Thu 28/5

14:10-18:50

2 stops37h 40m

$2,081

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Thu 28/5

19:23-06:55

1 stop20h 32m

$2,122

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 22/5

09:10-19:36

2 stops25h 26m

Lambert-St Louis

Fri 29/5

13:45-07:05

2 stops26h 20m

$2,183

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 6/5

09:20-13:13

2 stops42h 53m

Lambert-St Louis

Sun 10/5

07:05-07:20

2 stops33h 15m

$2,198

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Tue 19/5

09:15-17:56

2 stops23h 41m

Chicago Midway

Tue 26/5

10:59-06:50

2 stops28h 51m

$2,326

Flights are sorted by cheapest return flights first.

Deals found on 8/4

Showing 1-10 of 55 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

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

Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $1,104). Flying from Sydney to Illinois in January is currently the most expensive (average of $1,864). 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 9 April 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
626 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Overall

8.0

Crew

8.5

Comfort

8.0

Food

7.4

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

Boarding

8.2

Entertainment

7.4

Overall

8.0

Crew

8.5

Comfort

8.0

Food

7.4

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
1,017 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Overall

8.0

Crew

8.5

Comfort

8.0

Food

7.4

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
9,554 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Overall

8.0

Crew

8.5

Comfort

8.0

Food

7.4

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
11,559 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Overall

8.0

Crew

8.5

Comfort

8.0

Food

7.4

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
10,907 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Overall

8.0

Crew

8.5

Comfort

8.0

Food

7.4

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 09m. 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 cheapest airlines to fly from Sydney to Illinois one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $180. However, be on the lookout for offers from Qantas Airways and Air Canada, as they are both options that can get you from Sydney to Illinois for a low price.

  • 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, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $1,104). Flying from Sydney to Illinois in January is currently the most expensive (average of $1,864). 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 9 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,074Average$1,661FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapest$1,105Average$1,153FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,251Average$1,659FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air New ZealandCheapest$1,341Average$1,499FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
United AirlinesCheapest$1,402Average$2,120FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
ANACheapest$1,489Average$1,607FlexibilityNo 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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