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$969+ 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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
9 Jan — 16 Jan1
1 adult
1 adult, Economy, 0 bags

Flights to Illinois in 2025

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 10 December 2025.

Tue 23/1212:10SYD - ORD
2 stops24h 45mUnited Airlines
Wed 18/218:31ORD - SYD
1 stop21h 34mUnited Airlines
Deal found 9/12$1,728
Wed 24/1211:50SYD - ORD
1 stop19h 50mUnited Airlines
Sun 25/118:29ORD - SYD
1 stop21h 46mUnited Airlines
Deal found 7/12$1,732
Wed 17/1212:10SYD - ORD
1 stop19h 38mUnited Airlines
Thu 22/112:45ORD - SYD
1 stop27h 30mUnited Airlines
Deal found 8/12$1,800
Thu 25/1214:15SYD - MDW
2 stops25h 07mDelta
Thu 22/110:48MDW - SYD
2 stops27h 02mDelta
Deal found 9/12$1,803
Thu 25/1210:40SYD - ORD
2 stops25h 58mDelta
Thu 22/110:35ORD - SYD
2 stops28h 55mDelta
Deal found 9/12$1,803
Thu 25/1212:10SYD - ORD
2 stops25h 15mUnited Airlines
Sat 17/113:00ORD - SYD
2 stops27h 15mUnited Airlines
Deal found 7/12$1,806
Thu 25/1211:20SYD - ORD
1 stop20h 12mUnited Airlines
Thu 22/110:41ORD - SYD
1 stop29h 24mUnited Airlines
Deal found 9/12$1,820
Sun 14/1212:10SYD - ORD
1 stop19h 38mUnited Airlines
Fri 2/107:05ORD - SYD
1 stop33h 10mUnited Airlines
Deal found 9/12$1,878
Mon 15/1212:10SYD - ORD
1 stop33h 50mVirgin Australia
Fri 9/119:58ORD - SYD
1 stop41h 22mVirgin Australia
Deal found 8/12$1,997
Wed 24/1214:00SYD - ORD
1 stop23h 05mVirgin Australia
Thu 19/214:33ORD - SYD
1 stop25h 32mVirgin Australia
Deal found 9/12$2,103
Thu 25/1214:00SYD - ORD
1 stop24h 32mVirgin Australia
Thu 22/113:00ORD - SYD
1 stop27h 05mVirgin Australia
Deal found 8/12$2,107
Sun 14/1210:40SYD - MDW
2 stops22h 38mDelta
Fri 2/112:45MDW - SYD
2 stops26h 45mDelta
Deal found 9/12$3,306

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 10 December 2025
Explore Illinois
Look for other cheap flights to Chicago
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Find flight deals to Illinois

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 10 December 2025.

Return from

$1,571

One-way from

$937

Popular in

December

Cheapest in

March

Average price

$2,205
Air New Zealand
  • Air New Zealand
  • 26/1-2/2
  • 4 total stops
  • 49h 32m total
  • Sydney to Chicago
Search Deals
14/1
  • 14/1
  • 2 total stops
  • 38h 59m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($365 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($68 potential savings vs. average return price).
Search Deals
Average for return flights in December 2025
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 10 December 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

Mon 26/1

11:20-11:06

2 stops40h 46m

Chicago O'Hare Intl

Sun 8/2

21:15-09:35

2 stops43h 20m

$1,606

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 23/2

11:20-16:45

2 stops22h 25m

Chicago O'Hare Intl

Sun 1/3

15:35-09:35

1 stop25h 00m

$1,630

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 15/1

11:20-15:29

2 stops45h 09m

Lambert-St Louis

Sun 15/2

14:45-09:35

2 stops49h 50m

$1,699

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 11/5

09:55-21:31

2 stops26h 36m

Chicago O'Hare Intl

Mon 8/6

16:40-08:45

2 stops25h 05m

$1,714

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 27/1

11:20-08:05

3 stops37h 45m

Chicago O'Hare Intl

Sun 1/2

15:35-09:35

1 stop25h 00m

$1,723

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 29/12

14:00-20:00

2 stops23h 00m

Chicago O'Hare Intl

Tue 13/1

20:10-09:05

1 stop43h 55m

$1,728

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 23/12

12:10-19:55

2 stops24h 45m

Chicago O'Hare Intl

Wed 18/2

18:31-09:05

1 stop21h 34m

$1,728

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 25/12

12:10-17:04

1 stop21h 54m

Chicago O'Hare Intl

Sat 17/1

18:29-06:20

1 stop42h 51m

$1,732

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 24/12

12:10-14:55

1 stop19h 45m

Chicago O'Hare Intl

Sat 17/1

18:29-06:20

1 stop42h 51m

$1,732

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 24/12

11:50-14:40

1 stop19h 50m

Chicago O'Hare Intl

Sun 25/1

18:29-09:15

1 stop21h 46m

$1,732

Flights are sorted by cheapest return flights first.

Deals found on 9/12

Showing 1-10 of 27 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 22 hours 31 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 $955
United Airlines
United Airlines
From $1,344
Air Canada
Air Canada
From $1,176
Air New Zealand
Air New Zealand
From $1,157

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 10 December 2025.
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
552 reviews
Check prices

Overall

8.0

Entertainment

7.5

Boarding

8.2

Crew

8.5

Food

7.4

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LAX - ORD

Overall good experience with united . I fly united most part so nothing out of obvious i guess
Air New Zealand
8.0
Very Good
552 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Overall

8.0

Entertainment

7.5

Boarding

8.2

Crew

8.5

Food

7.4

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LAX - ORD

Overall good experience with united . I fly united most part so nothing out of obvious i guess
Qantas Airways
7.5
Good
947 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Overall

8.0

Entertainment

7.5

Boarding

8.2

Crew

8.5

Food

7.4

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LAX - ORD

Overall good experience with united . I fly united most part so nothing out of obvious i guess
United Airlines
7.4
Good
9,092 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Overall

8.0

Entertainment

7.5

Boarding

8.2

Crew

8.5

Food

7.4

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LAX - ORD

Overall good experience with united . I fly united most part so nothing out of obvious i guess
American Airlines
7.2
Good
11,048 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Overall

8.0

Entertainment

7.5

Boarding

8.2

Crew

8.5

Food

7.4

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LAX - ORD

Overall good experience with united . I fly united most part so nothing out of obvious i guess
Air Canada
7.1
Good
10,515 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Overall

8.0

Entertainment

7.5

Boarding

8.2

Crew

8.5

Food

7.4

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

LAX - ORD

Overall good experience with united . I fly united most part so nothing out of obvious i guess

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 $72.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $947, however they can be found for as little as $72.

  • 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 (19 hours 35 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
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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