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$540+ 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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
14 Mar — 21 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 12 February 2026.

Wed 22/409:20
SYD
-
ORD
1 stop20h 23m
Air Canada
Mon 27/415:45
ORD
-
SYD
2 stops48h 35m
Air Canada
Deal found 9/2$1,171
Wed 22/413:10
SYD
-
ORD
2 stops31h 40m
Multiple Airlines
Wed 29/406:00
ORD
-
SYD
1 stop34h 30m
Multiple Airlines
Deal found 10/2$1,266
Fri 15/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Sat 6/607:30
STL
-
SYD
2 stops56h 50m
Air Canada
Deal found 9/2$1,346
Fri 8/513:15
SYD
-
ORD
2 stops31h 35m
Multiple Airlines
Sat 6/612:44
ORD
-
SYD
2 stops32h 06m
Multiple Airlines
Deal found 12/2$1,466
Mon 23/211:20
SYD
-
ORD
1 stop29h 27m
American Airlines
Sun 8/311:31
ORD
-
SYD
1 stop29h 29m
American Airlines
Deal found 12/2$1,469
Thu 19/311:20
SYD
-
ORD
1 stop19h 33m
American Airlines
Tue 21/419:17
ORD
-
SYD
1 stop20h 48m
American Airlines
Deal found 12/2$1,477
Thu 19/211:20
SYD
-
STL
2 stops25h 09m
American Airlines
Mon 23/211:46
STL
-
SYD
2 stops28h 14m
American Airlines
Deal found 8/2$1,478
Tue 2/609:10
SYD
-
ORD
2 stops23h 49m
American Airlines
Tue 4/815:20
ORD
-
SYD
1 stop24h 45m
American Airlines
Deal found 12/2$1,478
Fri 6/311:20
SYD
-
ORD
2 stops27h 44m
Air Canada
Sun 15/318:25
ORD
-
SYD
2 stops46h 10m
Air Canada
Deal found 12/2$1,480
Mon 9/311:20
SYD
-
ORD
1 stop22h 26m
American Airlines
Sun 22/319:29
ORD
-
SYD
1 stop21h 31m
American Airlines
Deal found 12/2$1,481
Fri 6/311:20
SYD
-
ORD
2 stops27h 44m
Multiple Airlines
Sun 15/320:40
ORD
-
SYD
1 stop43h 55m
Multiple Airlines
Deal found 12/2$1,483
Tue 30/609:30
SYD
-
STL
2 stops29h 59m
United Airlines
Wed 22/719:06
STL
-
SYD
1 stop20h 49m
United Airlines
Deal found 11/2$1,495

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 12 February 2026
Explore Illinois
Look for other cheap flights to Chicago
Look for other cheap flights to Springfield
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 12 February 2026.

Return from

$1,120

One-way from

$565

Popular in

December

Cheapest in

April

Average price

$1,516
Air Canada
  • Air Canada
  • 5/3-18/3
  • 2 total stops
  • 45h 21m total
  • Sydney to Chicago
Search Deals
15/4
  • 15/4
  • 2 total stops
  • 31h 35m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($242 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($38 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 12 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

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 22/4

09:20-14:43

1 stop20h 23m

Chicago O'Hare Intl

Mon 27/4

15:45-07:20

2 stops48h 35m

$1,171

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 22/4

13:10-05:50

2 stops31h 40m

Chicago O'Hare Intl

Wed 29/4

06:00-07:30

1 stop34h 30m

$1,266

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 15/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Sat 6/6

07:30-07:20

2 stops56h 50m

$1,346

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 28/7

06:30-14:41

2 stops23h 11m

Chicago O'Hare Intl

Tue 18/8

15:35-07:20

2 stops24h 45m

$1,373

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 27/5

09:20-14:45

1 stop20h 25m

Chicago O'Hare Intl

Wed 3/6

15:40-07:20

1 stop24h 40m

$1,391

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 27/2

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Mon 2/3

16:47-09:35

2 stops47h 48m

$1,410

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 30/7

09:20-05:47

1 stop35h 27m

Chicago O'Hare Intl

Tue 18/8

15:40-07:20

1 stop24h 40m

$1,445

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 27/7

09:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Mon 17/8

15:40-07:20

1 stop24h 40m

$1,445

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 30/7

09:20-05:47

1 stop35h 27m

Chicago O'Hare Intl

Mon 17/8

15:40-07:20

1 stop24h 40m

$1,445

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 13/3

10:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Fri 20/3

15:35-08:35

1 stop25h 00m

$1,445

Flights are sorted by cheapest return flights first.

Deals found on 9/2

Showing 1-10 of 31 results
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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 21 hours 57 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 $791
United Airlines
United Airlines
From $1,241
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 12 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
582 reviews
Check prices

Boarding

8.2

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.4

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

Boarding

8.2

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.4

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
989 reviews
Air New Zealand
8.0
Very Good
582 reviews
Check prices

Boarding

8.2

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.4

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
9,285 reviews
Air New Zealand
8.0
Very Good
582 reviews
Check prices

Boarding

8.2

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.4

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
11,276 reviews
Air New Zealand
8.0
Very Good
582 reviews
Check prices

Boarding

8.2

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.4

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
10,717 reviews
Air New Zealand
8.0
Very Good
582 reviews
Check prices

Boarding

8.2

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.4

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 $69, while return flights cost around $351.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $465, however they can be found for as little as $351.

  • 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

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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

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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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