$793+ 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 15/10. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
23 Jul — 30 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 18 July 2025.

Return from

$1,502

One-way from

$793

Popular in

December

Cheapest in

February

Average price

$1,452
United Airlines
  • United Airlines
  • 9/9-9/9
  • 3 total stops
  • 65h 59m total
  • Sydney to Chicago
15/10
  • 15/10
  • 2 total stops
  • 29h 04m total
  • Sydney to Illinois
Highest demand for flights based on searches. 19% potential increase in price ($589 potential increase over avg. return price).
Cheapest flight prices on average. 5% potential price decrease ($120 potential savings vs. average return price).
Average for return flights in July 2025

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 18 July 2025
Explore Illinois

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 18 July 2025.

Mon 18/809:10SYD - STL
1 stop28h 59mAmerican Airlines
Sat 8/1111:20STL - SYD
2 stops28h 40mAmerican Airlines
Deal found 18/7$1,256
Fri 8/809:25SYD - STL
2 stops29h 28mDelta
Fri 15/811:28STL - SYD
2 stops28h 07mDelta
Deal found 17/7$1,308
Wed 20/813:15SYD - ORD
2 stops31h 25mMultiple Airlines
Mon 25/807:05ORD - SYD
2 stops37h 40mMultiple Airlines
Deal found 18/7$1,425
Tue 9/910:20SYD - ORD
2 stops23h 17mUnited Airlines
Tue 9/921:13ORD - SYD
1 stop42h 42mUnited Airlines
Deal found 16/7$1,502
Tue 29/711:50SYD - ORD
2 stops26h 22mAir New Zealand
Thu 7/816:50ORD - SYD
2 stops24h 55mAir New Zealand
Deal found 17/7$1,620
Mon 1/920:55SYD - ORD
2 stops47h 04mANA
Mon 8/917:45ORD - SYD
1 stop34h 30mANA
Deal found 18/7$1,661
Sun 10/809:10SYD - ORD
1 stop22h 38mAmerican Airlines
Sun 24/815:56ORD - SYD
2 stops24h 09mAmerican Airlines
Deal found 18/7$1,735
Mon 1/909:20SYD - STL
2 stops49h 37mMultiple Airlines
Mon 8/916:40STL - SYD
2 stops23h 40mMultiple Airlines
Deal found 18/7$1,774
Thu 27/1112:10SYD - STL
1 stop21h 17mUnited Airlines
Thu 11/1213:35STL - SYD
2 stops26h 30mUnited Airlines
Deal found 17/7$1,905
Tue 7/1010:20SYD - ORD
1 stop22h 22mAir Canada
Tue 28/1015:40ORD - SYD
1 stop24h 55mAir Canada
Deal found 18/7$1,957
Mon 1/909:20SYD - STL
2 stops49h 37mAir Canada
Mon 8/913:30STL - SYD
3 stops50h 50mAir Canada
Deal found 18/7$1,998
Mon 29/909:25SYD - MDW
2 stops27h 11mDelta
Sun 12/1006:00MDW - SYD
2 stops57h 35mDelta
Deal found 17/7$2,106

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 18 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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:10-18:29

2 stops24h 19m

Lambert-St Louis

Sat 8/11

11:20-09:00

2 stops28h 40m

$1,256

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 8/8

09:25-23:53

2 stops29h 28m

Lambert-St Louis

Fri 15/8

11:28-06:35

2 stops28h 07m

$1,308

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 20/8

13:15-05:40

2 stops31h 25m

Chicago O'Hare Intl

Mon 25/8

07:05-11:45

2 stops37h 40m

$1,425

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 9/9

10:20-18:37

2 stops23h 17m

Chicago O'Hare Intl

Tue 9/9

21:13-06:55

1 stop42h 42m

$1,502

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 29/7

11:50-23:12

2 stops26h 22m

Chicago O'Hare Intl

Thu 7/8

16:50-08:45

2 stops24h 55m

$1,620

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 1/9

20:55-04:59

2 stops47h 04m

Chicago O'Hare Intl

Mon 8/9

17:45-19:15

1 stop34h 30m

$1,661

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 10/8

09:10-16:48

1 stop22h 38m

Chicago O'Hare Intl

Sun 24/8

15:56-07:05

2 stops24h 09m

$1,735

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 1/9

09:20-19:57

2 stops49h 37m

Lambert-St Louis

Mon 8/9

16:40-07:20

2 stops23h 40m

$1,774

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 27/11

12:10-16:27

1 stop21h 17m

Lambert-St Louis

Thu 11/12

13:35-09:05

2 stops26h 30m

$1,905

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 7/10

10:20-16:42

1 stop22h 22m

Chicago O'Hare Intl

Tue 28/10

15:40-08:35

1 stop24h 55m

$1,957

Flights are sorted by cheapest return flights first.

Deals found on 15/7

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 23 hours 37 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 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 18 July 2025.
Read through reviews of airlines serving the United States, such as ANA, Korean Air, andSingapore Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

8.4

Comfort

8.2

Boarding

8.5

Food

7.7

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA
8.4
Very Good

Overall

8.4

Comfort

8.2

Boarding

8.5

Food

7.7

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

Overall

8.4

Comfort

8.2

Boarding

8.5

Food

7.7

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

Overall

8.4

Comfort

8.2

Boarding

8.5

Food

7.7

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA
8.0
Very Good

Overall

8.4

Comfort

8.2

Boarding

8.5

Food

7.7

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

Overall

8.4

Comfort

8.2

Boarding

8.5

Food

7.7

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

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 $200.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $402, however they can be found for as little as $130.

  • 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 (22 hours 42 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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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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