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$871+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
30 Dec — 6 Jan1
1 adult
1 adult, Economy, 0 bags

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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 30 November 2025.

Thu 4/1211:20SYD - ORD
2 stops22h 41mAir Canada
Mon 8/1215:40ORD - SYD
1 stop24h 55mAir Canada
Deal found 27/11$1,741
Thu 4/1210:40SYD - MDW
2 stops30h 07mDelta
Mon 8/1217:29MDW - SYD
2 stops46h 01mDelta
Deal found 27/11$1,806
Thu 25/1211:20SYD - ORD
1 stop22h 31mAmerican Airlines
Fri 23/111:46ORD - SYD
1 stop25h 24mAmerican Airlines
Deal found 28/11$1,855
Thu 25/1211:20SYD - ORD
2 stops23h 08mAmerican Airlines
Thu 22/113:15ORD - SYD
1 stop24h 40mAmerican Airlines
Deal found 27/11$1,860
Thu 25/1214:00SYD - ORD
1 stop28h 09mUnited Airlines
Fri 23/117:16ORD - SYD
1 stop22h 59mUnited Airlines
Deal found 30/11$1,878
Sat 20/1221:55SYD - STL
2 stops34h 09mQantas Airways
Mon 2/211:55STL - SYD
2 stops30h 00mQantas Airways
Deal found 30/11$2,041
Thu 25/1216:00SYD - ORD
2 stops33h 05mAir Canada
Fri 23/112:50ORD - SYD
2 stops27h 45mAir Canada
Deal found 28/11$2,058
Tue 23/1217:45SYD - MDW
2 stops45h 13mMultiple Airlines
Sat 17/106:10MDW - SYD
2 stops32h 15mMultiple Airlines
Deal found 28/11$2,465
Sat 20/1217:45SYD - STL
1 stop23h 06mAmerican Airlines
Mon 2/215:37STL - SYD
2 stops24h 23mAmerican Airlines
Deal found 30/11$2,482
Sat 20/1208:45SYD - STL
3 stops27h 41mMultiple Airlines
Mon 2/211:55STL - SYD
2 stops27h 20mMultiple Airlines
Deal found 30/11$2,972
Sun 14/1210:40SYD - MDW
2 stops30h 07mDelta
Fri 2/106:00MDW - SYD
2 stops33h 30mDelta
Deal found 29/11$3,550
Sun 28/1210:40SYD - MDW
2 stops23h 39mDelta
Thu 8/109:32MDW - SYD
2 stops28h 18mDelta
Deal found 28/11$12,736

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 30 November 2025
Explore Illinois
Look for other cheap flights to Chicago
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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 30 November 2025.

Return from

$1,512

One-way from

$871

Popular in

December

Cheapest in

March

Average price

$1,762
Delta
  • Delta
  • 22/1-4/2
  • 4 total stops
  • 50h 31m total
  • Sydney to Chicago
Search Deals
5/3
  • 5/3
  • 3 total stops
  • 45h 52m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($455 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($67 potential savings vs. average return price).
Search Deals
Average for return flights in November 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 30 November 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 - MDW

SYDMDW

Sydney Kingsford Smith

Thu 22/1

10:40-17:29

2 stops23h 49m

Chicago Midway

Wed 4/2

12:48-08:30

2 stops26h 42m

$1,512

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sun 3/5

09:10-15:56

1 stop21h 46m

Chicago O'Hare Intl

Tue 12/5

19:29-07:05

1 stop20h 36m

$1,551

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 4/4

10:20-08:02

2 stops37h 42m

Chicago O'Hare Intl

Thu 30/4

15:40-07:20

1 stop24h 40m

$1,629

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 6/5

09:20-19:19

2 stops24h 59m

Chicago O'Hare Intl

Sat 23/5

08:40-07:20

3 stops31h 40m

$1,640

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 17/1

14:00-19:50

1 stop22h 50m

Chicago O'Hare Intl

Fri 23/1

14:40-09:15

2 stops25h 35m

$1,657

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 3/4

10:20-16:36

2 stops46h 16m

Chicago O'Hare Intl

Thu 30/4

15:40-07:20

1 stop24h 40m

$1,718

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 15/1

11:20-16:55

2 stops22h 35m

Lambert-St Louis

Thu 29/1

14:45-09:35

2 stops25h 50m

$1,727

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 27/2

11:20-22:04

2 stops27h 44m

Chicago O'Hare Intl

Fri 13/3

07:15-08:35

3 stops33h 20m

$1,730

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/1

14:05-16:14

1 stop19h 09m

Lambert-St Louis

Wed 21/1

11:55-06:55

1 stop26h 00m

$1,783

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/1

11:20-16:14

2 stops21h 54m

Lambert-St Louis

Wed 21/1

17:12-06:55

1 stop20h 43m

$1,797

Flights are sorted by cheapest return flights first.

Deals found on 28/11

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 22 hours 40 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 $970
United Airlines
United Airlines
From $1,361
Air Canada
Air Canada
From $1,191
Air New Zealand
Air New Zealand
From $1,171

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 30 November 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
538 reviews
Check prices

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.5

Food

7.4

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
Air New Zealand
8.0
Very Good
538 reviews
Air New Zealand
8.0
Very Good
538 reviews
Check prices

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.5

Food

7.4

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
Qantas Airways
7.5
Good
946 reviews
Air New Zealand
8.0
Very Good
538 reviews
Check prices

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.5

Food

7.4

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
United Airlines
7.4
Good
9,056 reviews
Air New Zealand
8.0
Very Good
538 reviews
Check prices

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.5

Food

7.4

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
American Airlines
7.2
Good
11,042 reviews
Air New Zealand
8.0
Very Good
538 reviews
Check prices

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.5

Food

7.4

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.
Air Canada
7.1
Good
10,485 reviews
Air New Zealand
8.0
Very Good
538 reviews
Check prices

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.5

Food

7.4

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Annabel,Nov 2025

AKL - WRE

The seat I sat in the Auckland Airport at A waiting to board gate 42. Not far from the check in desk was dripping rain on me. When I looked up you could see on the beam discoloured drips. I forgot to say something to someone before boarding.

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 $50, while return flights cost around $73.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $439, however they can be found for as little as $73.

  • 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 (18 hours 47 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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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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