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Cheap flights from Sydney to Illinois from $664

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 16/3. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
27 Feb — 6 Mar1
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 28 January 2026.

Tue 10/309:55
SYD
-
ORD
2 stops26h 28m
Air New Zealand
Tue 17/316:00
ORD
-
SYD
2 stops26h 30m
Air New Zealand
Deal found 26/1$1,493
Tue 3/311:20
SYD
-
STL
1 stop29h 39m
American Airlines
Mon 13/412:27
STL
-
SYD
2 stops27h 38m
American Airlines
Deal found 26/1$1,495
Thu 19/211:20
SYD
-
STL
1 stop29h 39m
American Airlines
Mon 23/206:38
STL
-
SYD
1 stop33h 22m
American Airlines
Deal found 27/1$1,500
Thu 12/211:20
SYD
-
STL
2 stops25h 09m
American Airlines
Wed 18/214:31
STL
-
SYD
2 stops25h 29m
American Airlines
Deal found 27/1$1,510
Tue 10/310:20
SYD
-
ORD
1 stop20h 21m
Air Canada
Tue 17/310:35
ORD
-
SYD
2 stops30h 00m
Air Canada
Deal found 27/1$1,516
Mon 23/214:15
SYD
-
STL
2 stops35h 51m
Delta
Mon 2/311:23
STL
-
SYD
2 stops28h 07m
Delta
Deal found 25/1$1,519
Fri 13/206:30
SYD
-
STL
2 stops27h 43m
Qantas Airways
Thu 19/218:50
STL
-
SYD
2 stops30h 00m
Qantas Airways
Deal found 27/1$1,520
Tue 3/312:10
SYD
-
STL
2 stops25h 16m
United Airlines
Mon 13/416:49
STL
-
SYD
2 stops23h 11m
United Airlines
Deal found 28/1$1,526
Thu 12/311:20
SYD
-
STL
1 stop28h 38m
Multiple Airlines
Thu 19/318:50
STL
-
SYD
2 stops30h 50m
Multiple Airlines
Deal found 27/1$1,533
Thu 12/306:05
SYD
-
STL
2 stops25h 23m
Qantas Airways
Thu 19/318:50
STL
-
SYD
2 stops34h 50m
Qantas Airways
Deal found 27/1$1,544
Thu 12/311:20
SYD
-
STL
1 stop28h 38m
American Airlines
Thu 19/316:13
STL
-
SYD
1 stop22h 42m
American Airlines
Deal found 27/1$1,554
Thu 12/313:15
SYD
-
STL
2 stops26h 10m
Delta
Thu 19/312:28
STL
-
SYD
2 stops25h 37m
Delta
Deal found 26/1$1,559

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 28 January 2026.

Round-trip from

$1,493

One-way from

$664

Popular in

December

Cheapest in

March

Average price

$1,449
Air New Zealand
  • Air New Zealand
  • 10/3-17/3
  • 4 total stops
  • 52h 58m total
  • Sydney to Illinois
Search Deals
16/3
  • 16/3
  • 2 total stops
  • 30h 49m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($403 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($70 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 28 January 2026.
Use the filters below to find and compare flights from Sydney to Illinois that are best for you.

Fly from

Sydney

Fly to

Illinois

Route

Depart

Return

Price

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 10/3

09:55-20:23

2 stops26h 28m

Chicago O'Hare Intl

Tue 17/3

16:00-10:30

2 stops26h 30m

$1,493

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 3/3

11:20-21:12

2 stops26h 52m

Lambert-St Louis

Mon 13/4

12:27-07:05

2 stops27h 38m

$1,495

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 19/2

11:20-23:59

1 stop29h 39m

Lambert-St Louis

Mon 23/2

14:31-09:00

2 stops25h 29m

$1,495

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/2

11:20-19:29

2 stops25h 09m

Lambert-St Louis

Wed 18/2

14:31-09:00

2 stops25h 29m

$1,510

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 3/3

10:40-19:39

2 stops25h 59m

Lambert-St Louis

Mon 13/4

12:23-06:50

2 stops27h 27m

$1,519

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 12/3

11:45-23:08

2 stops27h 23m

Chicago O'Hare Intl

Thu 19/3

16:00-10:30

2 stops26h 30m

$1,632

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 16/2

11:50-14:43

1 stop19h 53m

Chicago O'Hare Intl

Wed 4/3

14:35-09:05

2 stops25h 30m

$1,717

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 7/3

11:20-14:53

1 stop20h 33m

Chicago O'Hare Intl

Sat 28/3

21:30-08:05

1 stop42h 35m

$1,786

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 15/2

11:20-17:05

2 stops22h 45m

Chicago O'Hare Intl

Mon 2/3

16:00-07:00

1 stop22h 00m

$1,789

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 7/3

12:10-17:00

2 stops21h 50m

Chicago O'Hare Intl

Sat 28/3

21:15-07:55

1 stop42h 40m

$1,789

Flights are sorted by cheapest return flights first.

Deals found on 25/1

Showing 1-10 of 47 results
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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 $892). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,488). 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.

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 28 January 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
577 reviews
Check prices

Entertainment

7.4

Crew

8.5

Food

7.4

Overall

8.0

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
Air New Zealand
8.0
Very Good
577 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Entertainment

7.4

Crew

8.5

Food

7.4

Overall

8.0

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
Qantas Airways
7.5
Good
978 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Entertainment

7.4

Crew

8.5

Food

7.4

Overall

8.0

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
United Airlines
7.4
Good
9,212 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Entertainment

7.4

Crew

8.5

Food

7.4

Overall

8.0

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
American Airlines
7.2
Good
11,201 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Entertainment

7.4

Crew

8.5

Food

7.4

Overall

8.0

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane
Air Canada
7.1
Good
10,666 reviews
Air New Zealand
8.0
Very Good
577 reviews
Check prices

Entertainment

7.4

Crew

8.5

Food

7.4

Overall

8.0

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

David,Jan 2026

AKL - IAH

Couple of spare seats on this flight so people could spread a little. Much better than a full plane

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 19h 53m. The distance between Sydney and Illinois is about 14851 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 $183. However, be on the lookout for offers from Qantas Airways and Air New Zealand, 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 $892). Flying from Sydney to Illinois in December is currently the most expensive (average of $1,488). 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

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Alternative routes for Sydney to Illinois

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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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$946Average$1,082FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,091Average$1,567FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapest$1,122Average$1,170FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air New ZealandCheapest$1,362Average$1,522FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
United AirlinesCheapest$1,423Average$2,176FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
ANACheapest$1,512Average$1,632FlexibilityNo 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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