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$649+ Cheap flights to Illinois

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.
— ORD
10 May — 17 May1
1 adult
1 adult, Economy, 0 bags

Flights to Illinois in 2026

Enter your travel dates to find the best prices.

Cheapest flights to Illinois
Explore the most affordable flight options available to Illinois. Find the lowest fares based on data from user searches, with prices last updated on 10 April 2026.

Wed 29/413:15
SYD
-
ORD
3 stops31h 53m
Multiple Airlines
Tue 5/512:40
ORD
-
SYD
3 stops32h 10m
Multiple Airlines
Deal found 10/4$1,518
Tue 28/413:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Mon 4/507:15
ORD
-
SYD
2 stops37h 35m
Multiple Airlines
Deal found 10/4$1,538
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
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

Find flights to Illinois

Browse one-way and return flights deals to Illinois on Cheapflights. Flight deals are based on user searches and were last updated on 10 April 2026
Explore Illinois
Look for other cheap flights to Chicago
Look for other cheap flights to St. Louis

Find flight deals to Illinois

Find the latest flights to Illinois in 2026, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 647,157 searches and data was last updated on 10 April 2026.

Return from

$1,518

One-way from

$649

Popular in

April

Cheapest in

August

Average price

$2,257
29/4-5/5
  • 29/4-5/5
  • 6 total stops
  • 64h 03m total
  • Sydney to Chicago
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 ($132 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($51 potential savings vs. average return price).
Search Deals
Average for return flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Locate flights to Illinois that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 647,157 searches and data was last updated on 10 April 2026.
Use the filters below to find and compare flights to Illinois that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 23/5

17:50-06:34

1 stop27h 44m

Chicago O'Hare Intl

Sat 30/5

20:46-07:30

1 stop43h 44m

$1,895

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/5

09:20-16:57

2 stops22h 37m

Lambert-St Louis

Mon 11/5

07:05-07:20

2 stops33h 15m

$1,986

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

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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:10-23:59

1 stop29h 49m

Lambert-St Louis

Thu 11/6

06:35-07:05

1 stop33h 30m

$2,079

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

09:10-23:56

1 stop29h 46m

Lambert-St Louis

Fri 29/5

19:20-12:30

2 stops50h 10m

$2,139

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 - ORD

SYDORD

Sydney Kingsford Smith

Sun 26/4

08:55-10:45

1 stop40h 50m

Chicago O'Hare Intl

Thu 30/4

14:10-06:20

1 stop25h 10m

$2,245

Flights are sorted by cheapest return flights first.

Deals found on 9/4

Showing 1-10 of 28 resultsSorted by cheapest first
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2
3

Best time to book a flight to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois 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 to Illinois

How long is the flight to Illinois?

On average, a flight from Sydney to Illinois takes 24 hours 3 minutes. Flights to Illinois from other popular cities in Australia will vary in length. Below are a few examples of popular routes and their flight times.

What are the most popular airlines that fly to Illinois?

The most popular airlines flying from Sydney to Illinois are Qantas Airways, Air Canada and United Airlines.

Qantas Airways
Qantas Airways
From $957
United Airlines
United Airlines
From $1,265
Air Canada
Air Canada
From $1,074
Air New Zealand
Air New Zealand
From $1,088

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from Sydney to Illinois are Air Canada, American Airlines and Qantas Airways.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 mm per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

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 April 2026.
Read through reviews of airlines serving the United States, such as Air New Zealand,Qantas Airways, andUnited Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Comfort

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

Entertainment

7.4

Overall

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Comfort

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
1,018 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Comfort

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
9,562 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Comfort

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
11,563 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Comfort

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
10,915 reviews
Air New Zealand
8.0
Very Good
626 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Crew

8.5

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding

FAQs about flying to Illinois

  • Can I find cheaper flights to Illinois if I am willing to have stopovers?

    Yes, flights with stopovers are often cheaper than direct flights. Keep an eye out for flight deals to Illinois on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to Illinois?

    Based on reviews from Cheapflights users, Qantas Airways is rated the highest out of the airlines that fly to Illinois.

  • What is the cheapest airport to fly to in Illinois?

    Chicago O'Hare Intl is currently the cheapest airport to fly to in Illinois. One-way flights to Chicago O'Hare Intl typically cost $116, while return flights cost around $184.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $410, however they can be found for as little as $184.

  • Where does the fastest flight to Illinois depart from?

    For those looking to save time traveling to Illinois, Sydney Kingsford Smith offers the quickest one-way flight (20 hours 37 minutes).

  • Does Chicago O'Hare Intl have car hire?

    Yes. Those touching down at Chicago O'Hare Intl can take advantage of the car hire services offered upon their arrival.

  • Are there hotels close to Chicago O'Hare Intl?

    Yes. Chicago O'Hare Intl has hotels nearby for those requiring accommodations. Hilton Chicago O'Hare Airport is the closest property to Chicago O'Hare Intl (0.0 km away from Chicago O'Hare Intl).

See more FAQs

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Find flights to Illinois

Select your preferred flight destination in Illinois from the list below.
Flights to O'Hare Intl
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Flights to Chicago

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Why should you use Cheapflights to find cheap flight tickets to Illinois?

Cheapflights helps you find that perfect flight to Illinois by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights to Illinois with no change fees?

Certainly. Search results for flights to Illinois shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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Yes! Start tracking prices for Illinois flights today and get alerted when prices change. To subscribe and begin receiving alerts, click the bell icon next to the flight deals above and provide your email address.

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