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$934+ 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 26/11. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
14 Dec — 21 Dec1
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 14 November 2025.

Mon 1/1211:20SYD - ORD
1 stop21h 48mAmerican Airlines
Tue 16/1211:45ORD - SYD
1 stop28h 15mAmerican Airlines
Deal found 11/11$1,555
Fri 14/1111:20SYD - ORD
1 stop22h 32mAmerican Airlines
Fri 21/1115:00ORD - SYD
1 stop25h 00mAmerican Airlines
Deal found 13/11$1,631
Thu 13/1112:25SYD - ORD
1 stop42h 25mANA
Wed 26/1118:00ORD - SYD
2 stops33h 15mANA
Deal found 12/11$1,709
Mon 17/1112:25SYD - ORD
2 stops33h 51mANA
Sun 30/1116:25ORD - SYD
1 stop25h 05mANA
Deal found 13/11$1,827
Sat 15/1109:55SYD - ORD
2 stops25h 55mAir New Zealand
Mon 29/1212:50ORD - SYD
2 stops30h 50mAir New Zealand
Deal found 11/11$1,941
Thu 13/1111:20SYD - ORD
1 stop20h 21mAir Canada
Wed 26/1115:40ORD - SYD
1 stop24h 55mAir Canada
Deal found 12/11$1,987
Fri 14/1111:20SYD - ORD
1 stop20h 21mAir Canada
Thu 27/1107:05ORD - SYD
2 stops33h 30mAir Canada
Deal found 12/11$2,051
Mon 17/1108:45SYD - ORD
1 stop45h 10mCathay Pacific
Sun 30/1114:35ORD - SYD
1 stop37h 15mCathay Pacific
Deal found 13/11$2,124
Sat 27/1214:15SYD - STL
2 stops35h 43mDelta
Sat 3/107:00STL - SYD
2 stops30h 50mDelta
Deal found 12/11$2,327
Sat 27/1212:10SYD - STL
2 stops22h 44mUnited Airlines
Sat 3/118:35STL - SYD
2 stops43h 25mUnited Airlines
Deal found 12/11$2,438
Sun 28/1210:40SYD - MDW
2 stops22h 40mDelta
Sun 4/109:50MDW - SYD
2 stops28h 00mDelta
Deal found 13/11$2,442
Thu 13/1110:40SYD - MDW
2 stops24h 38mDelta
Wed 26/1113:15MDW - SYD
2 stops26h 15mDelta
Deal found 12/11$2,513

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 14 November 2025
Explore Illinois
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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 14 November 2025.

Return from

$1,491

One-way from

$974

Popular in

December

Cheapest in

March

Average price

$1,762
Air New Zealand
  • Air New Zealand
  • 2/2-8/2
  • 4 total stops
  • 52h 42m total
  • Sydney to Chicago
Search Deals
Air New Zealand
  • Air New Zealand
  • 11/2
  • 2 total stops
  • 25h 04m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($369 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($60 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 14 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

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

10:25-15:29

2 stops45h 04m

Lambert-St Louis

Mon 16/3

09:00-08:35

2 stops31h 35m

$1,734

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 3/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Sun 17/5

05:20-06:55

2 stops34h 35m

$1,851

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 12/2

09:55-20:23

2 stops27h 28m

Chicago O'Hare Intl

Wed 6/5

16:17-10:35

2 stops27h 18m

$1,897

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 3/2

11:20-17:48

2 stops47h 28m

Chicago O'Hare Intl

Sat 7/2

10:00-09:35

2 stops30h 35m

$1,897

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 2/2

11:20-16:42

1 stop22h 22m

Chicago O'Hare Intl

Sun 8/2

15:40-09:35

1 stop24h 55m

$1,956

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 7/3

11:20-19:30

2 stops25h 10m

Chicago O'Hare Intl

Thu 12/3

07:15-08:35

3 stops33h 20m

$1,965

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 19/2

11:20-14:41

1 stop20h 21m

Chicago O'Hare Intl

Mon 2/3

15:40-09:35

1 stop24h 55m

$1,967

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 12/2

19:00-19:35

2 stops41h 35m

Chicago O'Hare Intl

Tue 5/5

00:30-07:40

2 stops40h 10m

$2,002

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 8/1

10:40-21:35

2 stops27h 55m

Lambert-St Louis

Mon 26/1

17:00-08:30

2 stops22h 30m

$2,028

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 8/1

10:40-08:53

2 stops39h 13m

Lambert-St Louis

Sun 1/2

09:59-08:30

2 stops29h 31m

$2,028

Flights are sorted by cheapest return flights first.

Deals found on 11/11

Showing 1-10 of 29 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 14 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 $971
United Airlines
United Airlines
From $1,362
Air Canada
Air Canada
From $1,191
Air New Zealand
Air New Zealand
From $1,172

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from Sydney to Illinois are Qantas Airways, Virgin Australia and American Airlines.

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 14 November 2025.
Read through reviews of airlines serving the United States, such as ANA, Air New Zealand, andQantas Airways. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very Good
1,004 reviews
Check prices

Boarding

8.6

Comfort

8.2

Food

7.7

Overall

8.4

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Julie,Sept 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
ANA
8.4
Very Good
1,004 reviews
ANA
8.4
Very Good
1,004 reviews
Check prices

Boarding

8.6

Comfort

8.2

Food

7.7

Overall

8.4

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Julie,Sept 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Air New Zealand
8.0
Very Good
526 reviews
ANA
8.4
Very Good
1,004 reviews
Check prices

Boarding

8.6

Comfort

8.2

Food

7.7

Overall

8.4

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Julie,Sept 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Qantas Airways
7.5
Good
934 reviews
ANA
8.4
Very Good
1,004 reviews
Check prices

Boarding

8.6

Comfort

8.2

Food

7.7

Overall

8.4

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Julie,Sept 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
United Airlines
7.4
Good
9,017 reviews
ANA
8.4
Very Good
1,004 reviews
Check prices

Boarding

8.6

Comfort

8.2

Food

7.7

Overall

8.4

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Julie,Sept 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.
Air Canada
7.1
Good
10,450 reviews
ANA
8.4
Very Good
1,004 reviews
Check prices

Boarding

8.6

Comfort

8.2

Food

7.7

Overall

8.4

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Julie,Sept 2025

CGK - HND

Flight attendants are nice, friendly and helpful. Highly recommend to flight with this airline.

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 $181.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $441, however they can be found for as little as $181.

  • 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 45 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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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!

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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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