Find flights
When to book
Airlines
FAQs

Cheap flights from Sydney to Illinois from $723

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 31/8. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — ORD
27 Apr — 4 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 28 March 2026.

Fri 1/513:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Sat 9/515:00
ORD
-
SYD
2 stops29h 50m
Multiple Airlines
Deal found 23/3$1,299
Sat 25/413:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Sat 2/515:00
ORD
-
SYD
2 stops29h 50m
Multiple Airlines
Deal found 26/3$1,315
Thu 14/509:20
SYD
-
ORD
1 stop20h 25m
Air Canada
Wed 20/508:45
ORD
-
SYD
2 stops31h 35m
Air Canada
Deal found 23/3$1,317
Thu 28/509:20
SYD
-
ORD
2 stops25h 48m
Air Canada
Thu 11/608:45
ORD
-
SYD
2 stops31h 35m
Air Canada
Deal found 23/3$1,327
Thu 7/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 14/507:05
STL
-
SYD
2 stops33h 15m
Air Canada
Deal found 23/3$1,360
Tue 26/509:20
SYD
-
ORD
1 stop25h 45m
Air Canada
Thu 11/607:09
ORD
-
SYD
2 stops33h 11m
Air Canada
Deal found 23/3$1,363
Tue 5/509:20
SYD
-
ORD
2 stops39h 58m
Air Canada
Fri 8/511:05
ORD
-
SYD
2 stops29h 15m
Air Canada
Deal found 23/3$1,372
Fri 29/509:20
SYD
-
ORD
2 stops39h 58m
Air Canada
Thu 11/615:40
ORD
-
SYD
1 stop24h 40m
Air Canada
Deal found 23/3$1,378
Sun 13/909:20
SYD
-
STL
2 stops43h 40m
Air Canada
Wed 23/908:55
STL
-
SYD
2 stops55h 25m
Air Canada
Deal found 23/3$1,432
Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 28/507:05
STL
-
SYD
2 stops33h 15m
Air Canada
Deal found 26/3$1,612
Sun 13/912:00
SYD
-
STL
1 stop19h 42m
Qantas Airways
Wed 23/906:30
STL
-
SYD
1 stop33h 35m
Qantas Airways
Deal found 23/3$1,718
Thu 7/509:10
SYD
-
STL
2 stops22h 31m
American Airlines
Thu 14/506:21
STL
-
SYD
1 stop33h 44m
American Airlines
Deal found 23/3$1,745

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 March 2026.

Round-trip from

$1,299

One-way from

$723

Popular in

December

Cheapest in

August

Average price

$1,614
1/5-9/5
  • 1/5-9/5
  • 4 total stops
  • 55h 02m total
  • Sydney to Illinois
Search Deals
31/8
  • 31/8
  • 3 total stops
  • 36h 25m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($107 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($34 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 March 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

Sun 21/6

09:15-23:18

1 stop29h 03m

Chicago O'Hare Intl

Sun 19/7

07:35-06:50

1 stop32h 15m

$1,771

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 13/9

21:25-18:37

2 stops36h 12m

Lambert-St Louis

Wed 23/9

06:30-07:05

1 stop33h 35m

$1,799

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 10/5

09:20-20:43

2 stops50h 23m

Lambert-St Louis

Sun 17/5

14:15-07:20

2 stops50h 05m

$1,879

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 12/5

09:20-08:00

2 stops37h 40m

Chicago O'Hare Intl

Tue 19/5

11:05-07:20

3 stops29h 15m

$1,889

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 11/5

09:20-12:06

1 stop41h 46m

Lambert-St Louis

Mon 18/5

13:05-07:20

2 stops51h 15m

$1,991
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

12:00-16:42

1 stop19h 42m

Lambert-St Louis

Mon 31/8

17:11-06:55

1 stop22h 44m

$2,018

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

09:10-23:08

1 stop28h 58m

Lambert-St Louis

Mon 31/8

16:18-07:05

2 stops23h 47m

$2,031

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

13:05-07:20

3 stops51h 15m

$2,047

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 7/6

09:30-22:44

2 stops28h 14m

Lambert-St Louis

Sun 12/7

19:23-06:55

1 stop20h 32m

$2,131

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 2/5

09:10-23:57

1 stop29h 47m

Lambert-St Louis

Mon 18/5

06:21-07:05

1 stop33h 44m

$2,133

Flights are sorted by cheapest return flights first.

Deals found on 26/3

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
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, April is the cheapest month in which you can book a flight from Sydney to Illinois (average of $973). Flying from Sydney to Illinois in January is currently the most expensive (average of $1,909). 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 28 March 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
621 reviews
Check prices

Comfort

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

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

Comfort

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

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
1,013 reviews
Air New Zealand
8.0
Very Good
621 reviews
Check prices

Comfort

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

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
9,493 reviews
Air New Zealand
8.0
Very Good
621 reviews
Check prices

Comfort

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

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
11,509 reviews
Air New Zealand
8.0
Very Good
621 reviews
Check prices

Comfort

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

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
10,850 reviews
Air New Zealand
8.0
Very Good
621 reviews
Check prices

Comfort

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

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 19h 42m. 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 $184. 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, April is the cheapest month in which you can book a flight from Sydney to Illinois (average of $973). Flying from Sydney to Illinois in January is currently the most expensive (average of $1,909). 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 28 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,100Average$1,592FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapest$1,132Average$1,181FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,257Average$1,690FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air New ZealandCheapest$1,374Average$1,535FlexibilityNo cancel feeOn-time78%
Search Air New Zealand flights
United AirlinesCheapest$1,436Average$2,172FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
ANACheapest$1,525Average$1,646FlexibilityNo 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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.