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$781+ 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 15/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
5 Jun — 12 Jun1
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 31 May 2025.

Return from

$1,568

One-way from

$781

Popular in

December

Cheapest in

March

Average price

$1,383
24/7-7/8
  • 24/7-7/8
  • 4 total stops
  • 63h 36m total
  • Sydney to Chicago
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Air Canada
  • Air Canada
  • 15/8
  • 2 total stops
  • 22h 11m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($530 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($113 potential savings vs. average return price).
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Average for return flights in May 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 31 May 2025
Explore Illinois
Look for other cheap flights to Chicago
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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 31 May 2025.

Mon 18/809:20SYD - STL
2 stops49h 40mMultiple Airlines
Sat 8/1116:43STL - SYD
2 stops23h 52mMultiple Airlines
Deal found 30/5$1,342
Fri 6/609:30SYD - STL
2 stops28h 15mUnited Airlines
Wed 18/616:32STL - SYD
2 stops23h 28mUnited Airlines
Deal found 30/5$1,401
Thu 24/713:15SYD - ORD
2 stops24h 31mMultiple Airlines
Thu 7/806:10ORD - SYD
2 stops39h 05mMultiple Airlines
Deal found 30/5$1,568
Thu 17/709:10SYD - ORD
1 stop22h 52mQantas Airways
Mon 28/718:45ORD - SYD
1 stop21h 20mQantas Airways
Deal found 30/5$1,597
Wed 18/609:10SYD - ORD
2 stops28h 21mAmerican Airlines
Sat 12/720:55ORD - SYD
1 stop43h 10mAmerican Airlines
Deal found 30/5$1,653
Wed 10/1211:50SYD - ORD
1 stop22h 18mUnited Airlines
Mon 12/110:40ORD - SYD
1 stop29h 25mUnited Airlines
Deal found 29/5$1,695
Fri 6/609:10SYD - STL
1 stop28h 49mAmerican Airlines
Wed 18/606:28STL - SYD
1 stop33h 37mAmerican Airlines
Deal found 30/5$1,773
Fri 6/609:20SYD - STL
3 stops49h 38mAir Canada
Wed 18/607:30STL - SYD
2 stops32h 50mAir Canada
Deal found 30/5$1,785
Wed 13/809:20SYD - ORD
3 stops37h 39mAir Canada
Mon 25/808:48ORD - SYD
2 stops31h 32mAir Canada
Deal found 30/5$1,877
Mon 4/808:45SYD - ORD
2 stops29h 14mAir New Zealand
Mon 25/816:30ORD - SYD
2 stops27h 05mAir New Zealand
Deal found 30/5$1,879
Mon 23/611:50SYD - ORD
2 stops47h 35mANA
Tue 29/717:45ORD - SYD
1 stop34h 30mANA
Deal found 30/5$1,921
Tue 24/609:30SYD - ORD
1 stop34h 21mVirgin Australia
Wed 9/706:30ORD - SYD
1 stop33h 25mVirgin Australia
Deal found 30/5$2,076

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 31 May 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

09:20-20:00

2 stops49h 40m

Lambert-St Louis

Sat 8/11

16:43-09:35

2 stops23h 52m

$1,342

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

10:20-16:45

1 stop21h 25m

Lambert-St Louis

Sat 8/11

11:10-07:00

1 stop26h 50m

$1,401

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 24/7

13:15-22:46

2 stops24h 31m

Chicago O'Hare Intl

Thu 7/8

06:10-12:15

2 stops39h 05m

$1,568

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 17/7

09:10-17:02

1 stop22h 52m

Chicago O'Hare Intl

Mon 28/7

18:45-07:05

1 stop21h 20m

$1,597

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 18/6

09:10-22:31

2 stops28h 21m

Chicago O'Hare Intl

Sat 12/7

20:55-07:05

1 stop43h 10m

$1,653

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 25/6

09:30-00:25

2 stops29h 55m

Chicago O'Hare Intl

Tue 8/7

21:42-07:00

1 stop42h 18m

$1,695

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 13/8

09:20-07:59

3 stops37h 39m

Chicago O'Hare Intl

Mon 25/8

08:48-07:20

2 stops31h 32m

$1,877

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 4/8

08:45-22:59

2 stops29h 14m

Chicago O'Hare Intl

Mon 25/8

16:30-10:35

2 stops27h 05m

$1,879

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 23/6

11:50-20:25

2 stops47h 35m

Chicago O'Hare Intl

Tue 29/7

17:45-19:15

1 stop34h 30m

$1,921

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 24/6

09:30-04:51

1 stop34h 21m

Chicago O'Hare Intl

Wed 9/7

06:30-06:55

1 stop33h 25m

$2,076

Flights are sorted by cheapest return flights first.

Deals found on 31/5

Showing 1-10 of 30 results
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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 27 hours 10 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 $642
Air Canada
Air Canada
From $832
United Airlines
United Airlines
From $996
ANA
ANA
From $1,026

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 31 May 2025.
Get a feel of what it's like to fly with Air Tahiti Nui, Japan Airlines and ANA to Illinois by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Boarding

8.7

Food

7.8

Entertainment

7.3

Crew

9.0

Comfort

8.1

Overall

8.7

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.7
Very Good
64 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Boarding

8.7

Food

7.8

Entertainment

7.3

Crew

9.0

Comfort

8.1

Overall

8.7

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Japan Airlines
8.3
Very Good
1,481 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Boarding

8.7

Food

7.8

Entertainment

7.3

Crew

9.0

Comfort

8.1

Overall

8.7

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very Good
876 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Boarding

8.7

Food

7.8

Entertainment

7.3

Crew

9.0

Comfort

8.1

Overall

8.7

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Delta
8.0
Very Good
7,952 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Boarding

8.7

Food

7.8

Entertainment

7.3

Crew

9.0

Comfort

8.1

Overall

8.7

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air New Zealand
8.0
Very Good
481 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Boarding

8.7

Food

7.8

Entertainment

7.3

Crew

9.0

Comfort

8.1

Overall

8.7

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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 $51, while return flights cost around $244.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $784, however they can be found for as little as $157.

  • 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

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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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!

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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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