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$702+ 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
13 Jul — 20 Jul1
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 8 July 2025.

Return from

$1,481

One-way from

$702

Popular in

December

Cheapest in

March

Average price

$1,623
20/8-27/8
  • 20/8-27/8
  • 4 total stops
  • 69h 20m total
  • Sydney to Chicago
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12/9
  • 12/9
  • 2 total stops
  • 29h 43m total
  • Sydney to Illinois
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Highest demand for flights based on searches. 18% potential increase in price ($565 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease ($120 potential savings vs. average return price).
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Average for return flights in July 2025
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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 8 July 2025
Explore Illinois
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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 8 July 2025.

Wed 20/811:50SYD - ORD
2 stops32h 50mMultiple Airlines
Wed 27/807:05ORD - SYD
2 stops36h 30mMultiple Airlines
Deal found 6/7$1,481
Fri 8/810:25SYD - ORD
1 stop20h 25mAmerican Airlines
Thu 28/808:55ORD - SYD
1 stop31h 10mAmerican Airlines
Deal found 8/7$1,515
Tue 11/1111:45SYD - ORD
2 stops24h 05mAir New Zealand
Sun 16/1114:30ORD - SYD
2 stops27h 00mAir New Zealand
Deal found 7/7$1,620
Mon 18/812:10SYD - STL
1 stop23h 12mAmerican Airlines
Sat 8/1106:15STL - SYD
1 stop33h 45mAmerican Airlines
Deal found 7/7$1,629
Sat 2/809:10SYD - ORD
1 stop20h 07mBritish Airways
Fri 15/811:45ORD - SYD
1 stop28h 20mBritish Airways
Deal found 7/7$1,692
Sat 1/1112:25SYD - ORD
2 stops32h 51mANA
Sat 15/1116:25ORD - SYD
1 stop34h 50mANA
Deal found 6/7$1,703
Mon 18/809:20SYD - STL
2 stops45h 01mMultiple Airlines
Sat 8/1113:35STL - SYD
2 stops27h 00mMultiple Airlines
Deal found 5/7$1,715
Mon 18/809:25SYD - STL
2 stops28h 58mDelta
Sat 8/1110:45STL - SYD
2 stops28h 45mDelta
Deal found 6/7$1,746
Thu 21/811:50SYD - STL
2 stops37h 11mAir New Zealand
Thu 28/811:05STL - SYD
2 stops30h 40mAir New Zealand
Deal found 7/7$1,766
Sat 22/1111:20SYD - STL
2 stops45h 09mAir Canada
Sun 14/1216:05STL - SYD
2 stops48h 30mAir Canada
Deal found 6/7$1,792
Fri 12/909:25SYD - MDW
2 stops23h 10mDelta
Sat 20/913:08MDW - SYD
2 stops26h 27mDelta
Deal found 7/7$2,259
Thu 21/810:20SYD - STL
1 stop21h 33mUnited Airlines
Thu 28/811:30STL - SYD
2 stops28h 30mUnited Airlines
Deal found 6/7$2,487

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 8 July 2025.
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 20/8

11:50-05:40

2 stops32h 50m

Chicago O'Hare Intl

Wed 27/8

07:05-10:35

2 stops36h 30m

$1,481

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 8/8

10:25-15:50

1 stop20h 25m

Chicago O'Hare Intl

Thu 28/8

08:55-07:05

1 stop31h 10m

$1,515

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 11/11

11:45-18:50

2 stops24h 05m

Chicago O'Hare Intl

Sun 16/11

14:30-10:30

2 stops27h 00m

$1,620

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

12:10-20:22

1 stop23h 12m

Lambert-St Louis

Sat 8/11

06:15-09:00

1 stop33h 45m

$1,629

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 2/8

09:10-14:17

1 stop20h 07m

Chicago O'Hare Intl

Fri 15/8

11:45-07:05

1 stop28h 20m

$1,692

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 1/11

12:25-05:16

2 stops32h 51m

Chicago O'Hare Intl

Sat 15/11

16:25-20:15

1 stop34h 50m

$1,703

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:20-15:21

2 stops45h 01m

Lambert-St Louis

Sat 8/11

13:35-09:35

2 stops27h 00m

$1,715

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:25-23:23

2 stops28h 58m

Lambert-St Louis

Sat 8/11

10:45-08:30

2 stops28h 45m

$1,746

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 21/8

11:50-10:01

2 stops37h 11m

Lambert-St Louis

Thu 28/8

11:05-08:45

2 stops30h 40m

$1,766

SydneyChicago

SYD - MDW

SYDMDW

Sydney Kingsford Smith

Fri 12/9

09:25-17:35

2 stops23h 10m

Chicago Midway

Sat 20/9

13:08-06:35

2 stops26h 27m

$2,259

Flights are sorted by cheapest return flights first.

Deals found on 8/7

Showing 1-10 of 23 results
1
2
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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 22 hours 53 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 $640
Air Canada
Air Canada
From $832
United Airlines
United Airlines
From $892
Virgin Australia
Virgin Australia
From $1,151

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 8 July 2025.
Read through reviews of airlines serving the United States, such as ANA, Japan Airlines, andSingapore Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very Good
896 reviews
Check prices

Entertainment

7.9

Overall

8.4

Crew

8.7

Comfort

8.2

Boarding

8.6

Food

7.7

Reviews

1 / 20
10.0
Excellent

Kenneth,July 2025

SFO - HND

Great food, great service, great comfort. Can’t ask for more although I’m only flying economy!
ANA
8.4
Very Good
896 reviews
ANA
8.4
Very Good
896 reviews
Check prices

Entertainment

7.9

Overall

8.4

Crew

8.7

Comfort

8.2

Boarding

8.6

Food

7.7

Reviews

1 / 20
10.0
Excellent

Kenneth,July 2025

SFO - HND

Great food, great service, great comfort. Can’t ask for more although I’m only flying economy!
Japan Airlines
8.3
Very Good
1,505 reviews
ANA
8.4
Very Good
896 reviews
Check prices

Entertainment

7.9

Overall

8.4

Crew

8.7

Comfort

8.2

Boarding

8.6

Food

7.7

Reviews

1 / 20
10.0
Excellent

Kenneth,July 2025

SFO - HND

Great food, great service, great comfort. Can’t ask for more although I’m only flying economy!
Singapore Airlines
8.1
Very Good
1,322 reviews
ANA
8.4
Very Good
896 reviews
Check prices

Entertainment

7.9

Overall

8.4

Crew

8.7

Comfort

8.2

Boarding

8.6

Food

7.7

Reviews

1 / 20
10.0
Excellent

Kenneth,July 2025

SFO - HND

Great food, great service, great comfort. Can’t ask for more although I’m only flying economy!
Delta
8.0
Very Good
7,962 reviews
ANA
8.4
Very Good
896 reviews
Check prices

Entertainment

7.9

Overall

8.4

Crew

8.7

Comfort

8.2

Boarding

8.6

Food

7.7

Reviews

1 / 20
10.0
Excellent

Kenneth,July 2025

SFO - HND

Great food, great service, great comfort. Can’t ask for more although I’m only flying economy!
Air New Zealand
8.0
Very Good
488 reviews
ANA
8.4
Very Good
896 reviews
Check prices

Entertainment

7.9

Overall

8.4

Crew

8.7

Comfort

8.2

Boarding

8.6

Food

7.7

Reviews

1 / 20
10.0
Excellent

Kenneth,July 2025

SFO - HND

Great food, great service, great comfort. Can’t ask for more although I’m only flying economy!

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 $49, while return flights cost around $153.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $101, however they can be found for as little as $100.

  • 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 7 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
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Flights to Moline
Flights to Bloomington
Flights to Springfield
Flights to Belleville
Flights to Chicago

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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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