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$948+ 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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
23 Jul — 30 Jul1
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 23 June 2026.

Wed 12/806:05
SYD
-
ORD
2 stops39h 12m
Multiple Airlines
Wed 19/809:20
ORD
-
SYD
3 stops35h 30m
Multiple Airlines
Deal found 22/6$1,309
Mon 3/813:15
SYD
-
MDW
3 stops36h 52m
Multiple Airlines
Mon 17/811:06
MDW
-
SYD
3 stops33h 44m
Multiple Airlines
Deal found 20/6$1,356
Mon 27/713:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Mon 10/810:16
ORD
-
SYD
3 stops34h 34m
Multiple Airlines
Deal found 19/6$1,393
Mon 3/813:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Mon 17/807:15
ORD
-
SYD
3 stops37h 35m
Multiple Airlines
Deal found 20/6$1,409
Mon 3/813:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Mon 10/810:16
ORD
-
SYD
3 stops44h 54m
Multiple Airlines
Deal found 19/6$1,445
Tue 7/710:20
SYD
-
STL
2 stops27h 21m
United Airlines
Sun 30/816:40
STL
-
SYD
2 stops23h 20m
United Airlines
Deal found 20/6$1,446
Mon 20/709:30
SYD
-
STL
2 stops29h 27m
United Airlines
Mon 27/719:23
STL
-
SYD
1 stop20h 32m
United Airlines
Deal found 22/6$1,448
Thu 3/913:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Sun 20/913:02
ORD
-
SYD
3 stops31h 48m
Multiple Airlines
Deal found 22/6$1,469
Sat 5/917:50
SYD
-
ORD
1 stop36h 04m
Qantas Airways
Sun 6/917:05
ORD
-
SYD
1 stop22h 20m
Qantas Airways
Deal found 22/6$1,493
Mon 6/709:15
SYD
-
STL
2 stops30h 28m
Delta
Sun 30/811:13
STL
-
SYD
2 stops28h 37m
Delta
Deal found 20/6$1,506
Sat 4/710:20
SYD
-
STL
2 stops24h 54m
United Airlines
Sun 30/816:40
STL
-
SYD
2 stops23h 20m
United Airlines
Deal found 20/6$1,516
Mon 20/710:20
SYD
-
STL
1 stop22h 57m
Air New Zealand
Mon 27/719:23
STL
-
SYD
1 stop20h 32m
Air New Zealand
Deal found 22/6$1,532

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 23 June 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 23 June 2026.

Return from

$1,309

One-way from

$850

Popular in

May

Cheapest in

August

Average price

$1,886
12/8-19/8
  • 12/8-19/8
  • 5 total stops
  • 74h 42m total
  • Sydney to Chicago
Search Deals
Delta
  • Delta
  • 27/8
  • 2 total stops
  • 22h 29m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($164 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($24 potential savings vs. average return price).
Search Deals
Average for return flights in June 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 23 June 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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 7/7

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Wed 2/9

15:13-07:00

2 stops24h 47m

$1,446

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 7/7

10:20-22:41

2 stops27h 21m

Lambert-St Louis

Sun 30/8

16:40-07:00

2 stops23h 20m

$1,446

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 20/7

09:30-23:57

2 stops29h 27m

Lambert-St Louis

Mon 27/7

19:23-06:55

1 stop20h 32m

$1,448

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 17/11

10:40-20:49

2 stops27h 09m

Lambert-St Louis

Tue 1/12

12:30-08:30

2 stops27h 00m

$1,585

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 3/7

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Fri 4/9

08:42-06:55

1 stop31h 13m

$1,586

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 6/7

09:15-00:43

2 stops30h 28m

Lambert-St Louis

Thu 3/9

14:32-06:50

2 stops25h 18m

$1,592

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/8

09:10-22:59

1 stop28h 49m

Lambert-St Louis

Mon 10/8

06:00-07:05

1 stop34h 05m

$1,615

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 11/11

11:45-23:02

2 stops28h 17m

Chicago O'Hare Intl

Mon 16/11

14:10-08:45

2 stops25h 35m

$1,640

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Thu 3/9

09:15-18:33

2 stops24h 18m

Chicago Midway

Sun 20/9

09:29-06:50

2 stops30h 21m

$1,675

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 3/9

09:15-18:19

2 stops24h 04m

Chicago O'Hare Intl

Sun 20/9

13:55-06:50

2 stops25h 55m

$1,675

Flights are sorted by cheapest return flights first.

Deals found on 22/6

Showing 1-10 of 27 resultsSorted by cheapest first
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2
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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 20 hours 12 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.

United Airlines
United Airlines
From $1,253
Qantas Airways
Qantas Airways
From $1,035
Air Canada
Air Canada
From $1,021
Air New Zealand
Air New Zealand
From $1,096

What are the cheapest airlines that fly to Illinois?

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

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).

When is the best time to book a flight to Illinois?

To ensure you get the cheapest price possible for a flight 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 23 June 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
645 reviews
Check prices

Food

7.4

Entertainment

7.4

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

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

Food

7.4

Entertainment

7.4

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

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
1,048 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Food

7.4

Entertainment

7.4

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

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
9,874 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Food

7.4

Entertainment

7.4

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

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
11,740 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Food

7.4

Entertainment

7.4

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

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
11,242 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Food

7.4

Entertainment

7.4

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

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, American Airlines 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 $208.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $603, however they can be found for as little as $208.

  • Where does the fastest flight to Illinois depart from?

    For those looking to save time traveling to Illinois, Brisbane offers the quickest one-way flight (20 hours 4 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

Browse thousands of different options on Cheapflights for your next trip

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Find flights to Illinois

Select your preferred flight destination in Illinois from the list below.
Flights to O'Hare Intl
Flights to Midway
Flights to Moline
Flights to Bloomington
Flights to Springfield
Flights to Belleville
Flights to Chicago

Fly with Cheapflights

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How does Cheapflights help users find flights to Illinois?

Cheapflights helps you search for flights to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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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