Find flights
Airlines

$704+ 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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
15 May — 22 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 15 April 2026.

Fri 1/513:15
SYD
-
ORD
2 stops31h 35m
Multiple Airlines
Sat 16/506:55
ORD
-
SYD
3 stops48h 15m
Multiple Airlines
Deal found 11/4$1,500
Sat 9/513:15
SYD
-
ORD
2 stops31h 44m
Multiple Airlines
Sun 31/507:15
ORD
-
SYD
2 stops37h 35m
Multiple Airlines
Deal found 14/4$1,536
Wed 27/513:15
SYD
-
ORD
3 stops46h 17m
Multiple Airlines
Wed 3/606:55
ORD
-
SYD
3 stops37h 55m
Multiple Airlines
Deal found 11/4$1,548
Fri 1/513:15
SYD
-
MDW
3 stops41h 58m
Multiple Airlines
Sat 16/506:00
MDW
-
SYD
3 stops49h 10m
Multiple Airlines
Deal found 12/4$1,580
Tue 8/911:45
SYD
-
ORD
2 stops32h 00m
ANA
Fri 11/917:45
ORD
-
SYD
1 stop34h 25m
ANA
Deal found 14/4$1,607
Thu 30/713:15
SYD
-
ORD
3 stops46h 38m
Multiple Airlines
Sat 1/809:33
ORD
-
SYD
3 stops35h 17m
Multiple Airlines
Deal found 11/4$1,612
Wed 11/1112:25
SYD
-
ORD
1 stop35h 55m
ANA
Mon 16/1120:00
ORD
-
SYD
2 stops31h 15m
ANA
Deal found 13/4$1,633
Thu 8/1012:45
SYD
-
ORD
2 stops32h 20m
ANA
Thu 22/1017:45
ORD
-
SYD
1 stop34h 25m
ANA
Deal found 12/4$1,650
Mon 11/513:15
SYD
-
ORD
3 stops46h 17m
Multiple Airlines
Mon 18/508:30
ORD
-
SYD
3 stops36h 35m
Multiple Airlines
Deal found 11/4$1,674
Wed 3/617:50
SYD
-
ORD
1 stop27h 14m
Multiple Airlines
Tue 23/621:13
ORD
-
SYD
1 stop43h 17m
Multiple Airlines
Deal found 14/4$1,688
Wed 27/509:20
SYD
-
STL
2 stops26h 05m
Air Canada
Wed 3/613:05
STL
-
SYD
2 stops51h 15m
Air Canada
Deal found 12/4$1,699
Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Multiple Airlines
Thu 28/516:48
STL
-
SYD
2 stops23h 32m
Multiple Airlines
Deal found 11/4$1,702

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 15 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 15 April 2026.

Return from

$1,500

One-way from

$839

Popular in

April

Cheapest in

August

Average price

$2,238
1/5-16/5
  • 1/5-16/5
  • 5 total stops
  • 79h 50m total
  • Sydney to Chicago
Search Deals
18/6
  • 18/6
  • 3 total stops
  • 48h 05m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($143 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($50 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 15 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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 27/5

09:20-20:25

3 stops50h 05m

Lambert-St Louis

Wed 3/6

13:05-07:20

2 stops51h 15m

$1,711

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Tue 5/5

17:50-11:09

2 stops32h 19m

Chicago Midway

Wed 20/5

06:00-07:30

2 stops34h 30m

$1,711

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

16:48-07:20

2 stops23h 32m

$1,767

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-20:25

2 stops26h 05m

Lambert-St Louis

Thu 28/5

13:05-07:20

3 stops51h 15m

$1,778

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 24/7

13:15-06:19

2 stops32h 04m

Chicago O'Hare Intl

Tue 28/7

06:55-22:10

3 stops48h 15m

$1,825

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 7/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Mon 11/5

17:59-07:20

2 stops46h 21m

$1,850

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 13/8

10:20-18:24

1 stop23h 04m

Lambert-St Louis

Sun 6/9

13:18-07:00

2 stops26h 42m

$2,080

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 16/5

15:40-14:20

2 stops37h 40m

Chicago O'Hare Intl

Sat 6/6

14:00-16:50

1 stop35h 50m

$2,107

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/8

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Sat 29/8

13:18-06:55

2 stops26h 37m

$2,152
Fastest return journey

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

$2,153

Flights are sorted by cheapest return flights first.

Deals found on 14/4

Showing 1-10 of 31 resultsSorted by cheapest first
1
2
3
4

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 23 hours 32 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 $949
United Airlines
United Airlines
From $1,254
Air Canada
Air Canada
From $1,065
Air New Zealand
Air New Zealand
From $1,079

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from Sydney to Illinois are Qantas Airways, Air Canada 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).

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 15 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
627 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.5

Comfort

7.9

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

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.5

Comfort

7.9

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
1,019 reviews
Air New Zealand
8.0
Very Good
627 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.5

Comfort

7.9

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
9,589 reviews
Air New Zealand
8.0
Very Good
627 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.5

Comfort

7.9

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
11,580 reviews
Air New Zealand
8.0
Very Good
627 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.5

Comfort

7.9

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
10,926 reviews
Air New Zealand
8.0
Very Good
627 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.4

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 $118, while return flights cost around $182.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $409, however they can be found for as little as $182.

  • 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 (21 hours 1 minute).

  • 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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

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 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.

Can Cheapflights notify me if prices for flights to Illinois become cheaper?

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.

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.