Find flights
Airlines

$669+ 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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
3 Mar — 10 Mar1
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 1 February 2026.

Sat 25/413:15
SYD
-
ORD
2 stops31h 35m
Multiple Airlines
Sat 9/506:00
ORD
-
SYD
1 stop34h 30m
Multiple Airlines
Deal found 31/1$1,444
Tue 17/314:00
SYD
-
ORD
2 stops30h 49m
Multiple Airlines
Tue 24/319:31
ORD
-
SYD
1 stop43h 54m
Multiple Airlines
Deal found 31/1$1,459
Mon 16/314:00
SYD
-
ORD
2 stops30h 49m
Multiple Airlines
Mon 23/319:39
ORD
-
SYD
1 stop43h 46m
Multiple Airlines
Deal found 30/1$1,464
Thu 19/211:20
SYD
-
STL
2 stops26h 52m
American Airlines
Mon 23/206:38
STL
-
SYD
1 stop33h 22m
American Airlines
Deal found 31/1$1,498
Wed 18/309:40
SYD
-
STL
2 stops27h 26m
Delta
Wed 25/307:15
STL
-
SYD
2 stops32h 10m
Delta
Deal found 1/2$1,524
Mon 16/311:20
SYD
-
STL
2 stops24h 09m
American Airlines
Mon 23/316:13
STL
-
SYD
2 stops24h 47m
American Airlines
Deal found 30/1$1,525
Thu 19/310:25
SYD
-
ORD
2 stops37h 35m
Air Canada
Tue 21/408:42
ORD
-
SYD
2 stops31h 38m
Air Canada
Deal found 31/1$1,525
Mon 16/313:05
SYD
-
STL
1 stop20h 08m
Multiple Airlines
Mon 23/316:13
STL
-
SYD
1 stop22h 42m
Multiple Airlines
Deal found 30/1$1,527
Mon 16/311:50
SYD
-
STL
1 stop26h 26m
United Airlines
Mon 23/316:47
STL
-
SYD
1 stop22h 13m
United Airlines
Deal found 31/1$1,530
Tue 17/310:20
SYD
-
ORD
1 stop20h 21m
Air Canada
Tue 24/310:35
ORD
-
SYD
2 stops30h 00m
Air Canada
Deal found 31/1$1,533
Thu 19/211:50
SYD
-
STL
1 stop20h 48m
United Airlines
Mon 23/217:25
STL
-
SYD
1 stop22h 50m
United Airlines
Deal found 29/1$1,543
Mon 16/310:25
SYD
-
ORD
2 stops25h 20m
Air Canada
Mon 23/311:11
ORD
-
SYD
2 stops29h 24m
Air Canada
Deal found 30/1$1,545

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 1 February 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 1 February 2026.

Return from

$1,444

One-way from

$653

Popular in

December

Cheapest in

March

Average price

$1,452
25/4-9/5
  • 25/4-9/5
  • 3 total stops
  • 66h 05m total
  • Sydney to Chicago
Search Deals
7/3
  • 7/3
  • 2 total stops
  • 31h 49m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($260 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($47 potential savings vs. average return price).
Search Deals
Average for return flights in February 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 1 February 2026.
Use the filters below to find and compare flights to Illinois that are best for you.

Fly from

Sydney

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 19/2

11:20-22:58

2 stops28h 38m

Lambert-St Louis

Mon 23/2

11:46-09:00

2 stops28h 14m

$1,498

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 18/3

09:40-21:06

2 stops27h 26m

Lambert-St Louis

Wed 25/3

07:15-07:25

2 stops32h 10m

$1,524

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 19/2

11:50-15:38

1 stop20h 48m

Lambert-St Louis

Mon 23/2

10:10-07:00

1 stop27h 50m

$1,524

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 18/3

12:10-22:25

1 stop26h 15m

Lambert-St Louis

Wed 25/3

16:47-07:00

1 stop22h 13m

$1,524

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 16/3

11:20-23:58

1 stop28h 38m

Lambert-St Louis

Mon 23/3

14:31-09:00

2 stops26h 29m

$1,525

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 16/3

13:05-17:13

1 stop20h 08m

Lambert-St Louis

Mon 23/3

16:13-06:55

1 stop22h 42m

$1,527

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 19/3

10:25-08:00

2 stops37h 35m

Chicago O'Hare Intl

Tue 21/4

08:42-07:20

2 stops31h 38m

$1,537

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 12/3

10:25-22:04

2 stops27h 39m

Chicago O'Hare Intl

Fri 20/3

15:35-08:35

1 stop25h 00m

$1,580

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 19/2

11:45-19:55

2 stops25h 10m

Chicago O'Hare Intl

Fri 6/3

14:26-10:30

2 stops27h 04m

$1,654

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 28/3

14:00-04:49

2 stops30h 49m

Chicago O'Hare Intl

Sun 5/4

19:45-07:30

1 stop44h 45m

$1,654

Flights are sorted by cheapest return flights first.

Deals found on 30/1

Showing 1-10 of 25 results
1
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 21 hours 49 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 $817
United Airlines
United Airlines
From $1,267
Air Canada
Air Canada
From $1,087
Air New Zealand
Air New Zealand
From $1,102

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 1 February 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
578 reviews
Check prices

Crew

8.5

Comfort

8.0

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

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

Crew

8.5

Comfort

8.0

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

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
983 reviews
Air New Zealand
8.0
Very Good
578 reviews
Check prices

Crew

8.5

Comfort

8.0

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

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
9,225 reviews
Air New Zealand
8.0
Very Good
578 reviews
Check prices

Crew

8.5

Comfort

8.0

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

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
11,211 reviews
Air New Zealand
8.0
Very Good
578 reviews
Check prices

Crew

8.5

Comfort

8.0

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

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
10,673 reviews
Air New Zealand
8.0
Very Good
578 reviews
Check prices

Crew

8.5

Comfort

8.0

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

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

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 $71, while return flights cost around $358.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $475, however they can be found for as little as $358.

  • 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 (19 hours 24 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

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.