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$724+ 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 31/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
29 Apr — 6 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 30 March 2026.

Sat 25/413:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Sat 2/515:00
ORD
-
SYD
2 stops29h 50m
Multiple Airlines
Deal found 26/3$1,318
Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 28/507:05
STL
-
SYD
2 stops33h 15m
Air Canada
Deal found 28/3$1,597
Tue 12/513:15
SYD
-
ORD
3 stops48h 58m
Multiple Airlines
Tue 19/506:55
ORD
-
SYD
3 stops37h 55m
Multiple Airlines
Deal found 28/3$1,674
Fri 17/406:00
SYD
-
ORD
2 stops32h 27m
Multiple Airlines
Sat 2/508:00
ORD
-
SYD
2 stops36h 50m
Multiple Airlines
Deal found 28/3$1,719
Mon 27/413:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Sun 3/505:15
ORD
-
SYD
2 stops39h 35m
Multiple Airlines
Deal found 29/3$1,725
Tue 12/513:15
SYD
-
MDW
3 stops36h 54m
Multiple Airlines
Tue 19/506:00
MDW
-
SYD
3 stops38h 50m
Multiple Airlines
Deal found 28/3$1,734
Fri 24/413:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Fri 15/507:15
ORD
-
SYD
2 stops37h 35m
Multiple Airlines
Deal found 25/3$1,742
Tue 19/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Sat 30/509:30
ORD
-
SYD
2 stops35h 20m
Multiple Airlines
Deal found 29/3$1,748
Tue 19/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Tue 26/508:00
ORD
-
SYD
2 stops36h 50m
Multiple Airlines
Deal found 29/3$1,758
Thu 23/417:50
SYD
-
ORD
1 stop27h 30m
Multiple Airlines
Thu 7/509:30
ORD
-
SYD
2 stops35h 20m
Multiple Airlines
Deal found 26/3$1,764
Mon 11/517:50
SYD
-
ORD
1 stop27h 49m
Multiple Airlines
Mon 18/520:56
ORD
-
SYD
2 stops47h 54m
Multiple Airlines
Deal found 27/3$1,772
Wed 13/509:20
SYD
-
STL
2 stops49h 49m
Air Canada
Wed 20/507:05
STL
-
SYD
2 stops57h 15m
Air Canada
Deal found 28/3$1,799

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 30 March 2026
Explore Illinois
Look for other cheap flights to Chicago
Look for other cheap flights to Moline
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 30 March 2026.

Return from

$1,318

One-way from

$724

Popular in

December

Cheapest in

August

Average price

$1,617
25/4-2/5
  • 25/4-2/5
  • 4 total stops
  • 61h 10m total
  • Sydney to Chicago
Search Deals
31/8
  • 31/8
  • 3 total stops
  • 36h 25m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($74 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($23 potential savings vs. average return price).
Search Deals
Average for return flights in March 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 30 March 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

Sun 10/5

09:20-20:43

2 stops50h 23m

Lambert-St Louis

Sun 17/5

14:15-07:20

2 stops50h 05m

$1,882

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-16:33

2 stops46h 13m

Lambert-St Louis

Sun 24/5

07:05-07:20

2 stops33h 15m

$1,934

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

13:05-07:20

3 stops51h 15m

$2,045

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:10-23:59

1 stop29h 49m

Lambert-St Louis

Thu 28/5

09:41-07:05

2 stops30h 24m

$2,049

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 18/4

15:40-15:21

2 stops38h 41m

Chicago O'Hare Intl

Sun 3/5

14:00-16:50

1 stop35h 50m

$2,125

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 2/5

09:10-23:57

1 stop29h 47m

Lambert-St Louis

Mon 18/5

06:21-07:05

1 stop33h 44m

$2,137

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

$2,172

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 7/6

12:00-19:36

1 stop22h 36m

Lambert-St Louis

Sun 12/7

19:26-06:55

1 stop20h 29m

$2,179

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 10/5

15:40-14:20

2 stops37h 40m

Chicago O'Hare Intl

Sun 17/5

14:00-16:50

1 stop35h 50m

$2,179

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 7/6

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Sun 12/7

05:10-06:55

2 stops34h 45m

$2,198

Flights are sorted by cheapest return flights first.

Deals found on 26/3

Showing 1-10 of 27 resultsSorted by cheapest first
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 28 hours 41 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 $984
United Airlines
United Airlines
From $1,298
Air Canada
Air Canada
From $1,098
Air New Zealand
Air New Zealand
From $1,117

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 30 March 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
623 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

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

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

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
1,014 reviews
Air New Zealand
8.0
Very Good
623 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

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
9,517 reviews
Air New Zealand
8.0
Very Good
623 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

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
11,530 reviews
Air New Zealand
8.0
Very Good
623 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

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
10,862 reviews
Air New Zealand
8.0
Very Good
623 reviews
Check prices

Boarding

8.2

Entertainment

7.4

Food

7.4

Overall

8.0

Comfort

8.0

Crew

8.5

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 $119, while return flights cost around $260.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $1,772, however they can be found for as little as $260.

  • 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

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

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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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