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$681+ 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 17/10. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
3 sept. — 10 sept.1
1 adult

Flights to Illinois in 2025

Find the latest flights to Illinois in 2025, 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 29 août 2025.

Return from

$1,481

One-way from

$681

Popular in

December

Cheapest in

February

Average price

$1,597
Air Canada
  • Air Canada
  • 28/9-8/10
  • 2 total stops
  • 45h 15m total
  • Sydney to Chicago
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17/10
  • 17/10
  • 2 total stops
  • 46h 39m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($705 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease ($116 potential savings vs. average return price).
Search Deals
Average for return flights in August 2025
Search Deals

Find flight deals to Illinois

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 29 août 2025.

lun. 13/1010:20SYD - STL
2 stops44h 58mAir Canada
lun. 20/1016:05STL - SYD
2 stops48h 15mAir Canada
Deal found 29/8$1,130
mar. 25/1111:20SYD - STL
2 stops45h 09mAir Canada
jeu. 11/1209:00STL - SYD
2 stops31h 35mAir Canada
Deal found 28/8$1,185
mar. 25/1111:20SYD - STL
2 stops45h 09mAir Canada
lun. 8/1213:35STL - SYD
2 stops27h 00mAir Canada
Deal found 27/8$1,186
mar. 25/1111:20SYD - STL
2 stops45h 09mAir Canada
lun. 15/1209:00STL - SYD
2 stops31h 35mAir Canada
Deal found 27/8$1,189
mar. 25/1111:20SYD - STL
2 stops27h 34mAir Canada
dim. 14/1216:05STL - SYD
2 stops48h 30mAir Canada
Deal found 28/8$1,193
mer. 26/1111:20SYD - STL
2 stops45h 09mAir Canada
dim. 14/1216:05STL - SYD
2 stops48h 30mAir Canada
Deal found 28/8$1,194
mar. 25/1111:20SYD - STL
2 stops45h 09mAir Canada
dim. 7/1216:05STL - SYD
2 stops48h 30mAir Canada
Deal found 27/8$1,196
ven. 28/1111:20SYD - STL
2 stops22h 19mMultiple Airlines
dim. 14/1216:05STL - SYD
2 stops48h 30mMultiple Airlines
Deal found 28/8$1,208
ven. 21/1111:20SYD - STL
2 stops45h 09mAir Canada
mer. 10/1216:37STL - SYD
2 stops45h 18mAir Canada
Deal found 27/8$1,216
dim. 28/909:20SYD - ORD
1 stop20h 40mAir Canada
mer. 8/1015:45ORD - SYD
1 stop24h 35mAir Canada
Deal found 27/8$1,481
sam. 4/1009:20SYD - ORD
1 stop20h 40mAir Canada
sam. 11/1015:45ORD - SYD
1 stop24h 35mAir Canada
Deal found 27/8$1,505
sam. 4/1009:20SYD - ORD
1 stop20h 40mAir Canada
ven. 10/1021:12ORD - SYD
2 stops43h 08mAir Canada
Deal found 27/8$1,516

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 29 août 2025.
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

lun. 13/10

10:20-15:18

2 stops44h 58m

Lambert-St Louis

lun. 20/10

16:05-08:20

2 stops48h 15m

$1,130

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

mar. 25/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

jeu. 11/12

09:00-09:35

2 stops31h 35m

$1,185

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

jeu. 27/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

lun. 15/12

09:00-09:35

2 stops31h 35m

$1,185

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

jeu. 27/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

jeu. 11/12

13:35-06:55

2 stops24h 20m

$1,185

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

mar. 25/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

lun. 15/12

09:00-09:35

2 stops31h 35m

$1,185

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

mar. 25/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

mar. 9/12

16:37-09:35

2 stops23h 58m

$1,185

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

mar. 25/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

mer. 10/12

16:37-06:55

2 stops45h 18m

$1,186

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

mar. 25/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

lun. 8/12

13:35-09:35

2 stops27h 00m

$1,186

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

jeu. 27/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

mar. 9/12

09:00-06:55

2 stops28h 55m

$1,186

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

jeu. 2/10

09:20-16:42

1 stop22h 22m

Chicago O'Hare Intl

ven. 10/10

15:45-08:20

1 stop24h 35m

$1,481

Flights are sorted by cheapest return flights first.

Deals found on 28/8

Showing 1-10 of 50 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 23 hours 38 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.

When is the cheapest time to fly to Illinois?

Use this chart to determine the cheapest time to fly return from Sydney to Illinois. Price data was last updated on 16 December 2024.

Users looking for the lowest fares to Illinois should consider flying on Monday at midday, when prices are typically cheapest. Budget-minded travellers will want to avoid Sunday evenings, when prices are usually at their highest.

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 $636
Air Canada
Air Canada
From $824
United Airlines
United Airlines
From $892
Air New Zealand
Air New Zealand
From $768

What are the cheapest airlines that fly to Illinois?

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

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 29 août 2025.
Read through reviews of airlines serving the United States, such as ANA, Qantas Airways, andUnited Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very Good
941 reviews
Check prices

Comfort

8.2

Boarding

8.6

Crew

8.7

Overall

8.4

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
ANA
8.4
Very Good
941 reviews
ANA
8.4
Very Good
941 reviews
Check prices

Comfort

8.2

Boarding

8.6

Crew

8.7

Overall

8.4

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
Qantas Airways
7.5
Good
905 reviews
ANA
8.4
Very Good
941 reviews
Check prices

Comfort

8.2

Boarding

8.6

Crew

8.7

Overall

8.4

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
United Airlines
7.4
Good
8,941 reviews
ANA
8.4
Very Good
941 reviews
Check prices

Comfort

8.2

Boarding

8.6

Crew

8.7

Overall

8.4

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
American Airlines
7.2
Good
10,000 reviews
ANA
8.4
Very Good
941 reviews
Check prices

Comfort

8.2

Boarding

8.6

Crew

8.7

Overall

8.4

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
Air Canada
7.1
Good
10,000 reviews
ANA
8.4
Very Good
941 reviews
Check prices

Comfort

8.2

Boarding

8.6

Crew

8.7

Overall

8.4

Food

7.7

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me

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 $50, while return flights cost around $177.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $134, however they can be found for as little as $115.

  • 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 24 minutes).

  • Which airport is closest to River North?

    f being close to River North is important to you, you’ll want to land at Chicago O'Hare Intl Airport.

  • 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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