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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 23/3. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
11 Jan — 18 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 12 December 2025.

Tue 30/1212:10SYD - ORD
1 stop28h 04mUnited Airlines
Wed 14/118:30ORD - SYD
1 stop21h 35mUnited Airlines
Deal found 10/12$1,724
Tue 23/1212:10SYD - ORD
1 stop19h 45mUnited Airlines
Mon 2/213:55ORD - SYD
2 stops26h 10mUnited Airlines
Deal found 11/12$1,727
Mon 15/1212:10SYD - ORD
2 stops21h 48mUnited Airlines
Fri 9/116:16ORD - SYD
1 stop21h 04mUnited Airlines
Deal found 10/12$1,799
Wed 17/1211:20SYD - ORD
1 stop20h 05mUnited Airlines
Thu 22/116:10ORD - SYD
1 stop23h 55mUnited Airlines
Deal found 10/12$1,801
Thu 25/1212:10SYD - ORD
2 stops21h 49mUnited Airlines
Thu 22/114:36ORD - SYD
2 stops25h 29mUnited Airlines
Deal found 11/12$1,802
Sun 14/1212:10SYD - ORD
1 stop28h 00mUnited Airlines
Fri 2/114:40ORD - SYD
1 stop22h 40mUnited Airlines
Deal found 10/12$1,874
Tue 23/1211:20SYD - ORD
1 stop20h 12mVirgin Australia
Mon 2/213:00ORD - SYD
1 stop27h 05mVirgin Australia
Deal found 11/12$2,026
Thu 25/1212:10SYD - ORD
1 stop24h 55mVirgin Australia
Thu 22/116:10ORD - SYD
1 stop23h 55mVirgin Australia
Deal found 11/12$2,101
Wed 31/1211:50SYD - ORD
1 stop22h 15mUnited Airlines
Thu 15/114:40ORD - SYD
1 stop25h 25mUnited Airlines
Deal found 11/12$2,197
Fri 26/1211:20SYD - ORD
1 stop35h 45mAmerican Airlines
Tue 6/115:23ORD - SYD
2 stops30h 02mAmerican Airlines
Deal found 10/12$2,370
Fri 26/1210:40SYD - MDW
2 stops28h 42mDelta
Tue 6/113:28MDW - SYD
2 stops24h 22mDelta
Deal found 10/12$2,589
Sun 28/1210:40SYD - MDW
2 stops28h 42mDelta
Thu 8/111:21MDW - SYD
2 stops26h 29mDelta
Deal found 10/12$3,139

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 12 December 2025
Explore Illinois
Look for other cheap flights to Chicago
Look for other cheap flights to St. Louis

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 12 December 2025.

Return from

$1,523

One-way from

$1,071

Popular in

December

Cheapest in

March

Average price

$2,199
Air Canada
  • Air Canada
  • 2/2-19/2
  • 3 total stops
  • 50h 21m total
  • Sydney to Chicago
Search Deals
15/1
  • 15/1
  • 3 total stops
  • 54h 52m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($363 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 12 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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 24/1

06:20-14:41

2 stops25h 21m

Lambert-St Louis

Sat 31/1

17:04-22:15

2 stops36h 11m

$1,660

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 30/12

12:10-23:14

1 stop28h 04m

Chicago O'Hare Intl

Wed 14/1

18:30-09:05

1 stop21h 35m

$1,724

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 4/2

10:40-16:57

2 stops23h 17m

Chicago O'Hare Intl

Sun 3/5

19:59-06:35

2 stops43h 36m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 4/2

12:10-17:04

2 stops21h 54m

Chicago O'Hare Intl

Sun 3/5

16:40-06:55

1 stop23h 15m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 3/2

14:00-18:48

1 stop21h 48m

Chicago O'Hare Intl

Sat 2/5

21:20-06:55

1 stop42h 35m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 23/12

14:00-21:32

1 stop24h 32m

Chicago O'Hare Intl

Mon 9/2

18:29-09:15

1 stop21h 46m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 23/3

10:20-17:00

2 stops22h 40m

Chicago O'Hare Intl

Sun 5/4

21:10-07:00

1 stop42h 50m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/2

11:50-14:40

1 stop19h 50m

Chicago O'Hare Intl

Sat 2/5

21:20-06:55

1 stop42h 35m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 5/2

11:20-17:04

2 stops22h 44m

Chicago O'Hare Intl

Sun 3/5

18:20-06:55

1 stop21h 35m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 25/1

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Fri 30/1

15:35-13:00

2 stops28h 25m

$1,729

Flights are sorted by cheapest return flights first.

Deals found on 10/12

Showing 1-10 of 31 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 50 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 $952
United Airlines
United Airlines
From $1,340
Air Canada
Air Canada
From $1,172
Air New Zealand
Air New Zealand
From $1,153

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 12 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

Boarding

8.2

Entertainment

7.5

Comfort

8.0

Crew

8.5

Overall

8.0

Food

7.4

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

Boarding

8.2

Entertainment

7.5

Comfort

8.0

Crew

8.5

Overall

8.0

Food

7.4

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

Boarding

8.2

Entertainment

7.5

Comfort

8.0

Crew

8.5

Overall

8.0

Food

7.4

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
9,095 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Boarding

8.2

Entertainment

7.5

Comfort

8.0

Crew

8.5

Overall

8.0

Food

7.4

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
11,050 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Boarding

8.2

Entertainment

7.5

Comfort

8.0

Crew

8.5

Overall

8.0

Food

7.4

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
10,516 reviews
Air New Zealand
8.0
Very Good
552 reviews
Check prices

Boarding

8.2

Entertainment

7.5

Comfort

8.0

Crew

8.5

Overall

8.0

Food

7.4

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 $945, 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, Brisbane offers the quickest one-way flight (21 hours 4 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 Bloomington
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Flights to Belleville
Flights to Chicago

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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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