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$753+ 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 15/11. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
7 Jun — 14 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 2 June 2025.

Return from

$1,661

One-way from

$753

Popular in

December

Cheapest in

March

Average price

$1,703
5/9-12/9
  • 5/9-12/9
  • 4 total stops
  • 63h 14m total
  • Sydney to Chicago
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15/11
  • 15/11
  • 2 total stops
  • 34h 31m total
  • Sydney to Illinois
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Highest demand for flights based on searches. 17% potential increase in price ($528 potential increase over avg. return price).
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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 June 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 2 June 2025
Explore Illinois
Look for other cheap flights to Chicago
Look for other cheap flights to Moline
Look for other cheap flights to Bloomington
Look for other cheap flights to Springfield

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 2 June 2025.

Fri 5/913:15SYD - ORD
2 stops24h 49mMultiple Airlines
Fri 12/906:20ORD - SYD
2 stops38h 25mMultiple Airlines
Deal found 1/6$1,661
Mon 18/809:20SYD - STL
2 stops49h 40mMultiple Airlines
Sat 8/1113:35STL - SYD
2 stops27h 00mMultiple Airlines
Deal found 1/6$1,673
Wed 16/709:30SYD - ORD
1 stop20h 12mUnited Airlines
Wed 23/716:20ORD - SYD
2 stops23h 40mUnited Airlines
Deal found 31/5$1,709
Fri 6/611:50SYD - ORD
2 stops47h 35mANA
Sat 6/1216:25ORD - SYD
1 stop34h 50mANA
Deal found 1/6$1,766
Fri 6/609:10SYD - STL
2 stops24h 21mAmerican Airlines
Thu 19/613:21STL - SYD
2 stops26h 44mAmerican Airlines
Deal found 1/6$1,825
Fri 20/609:10SYD - ORD
1 stop29h 25mAmerican Airlines
Wed 23/706:13ORD - SYD
1 stop33h 52mAmerican Airlines
Deal found 2/6$1,847
Sun 15/610:20SYD - STL
1 stop22h 40mUnited Airlines
Mon 28/713:42STL - SYD
2 stops26h 18mUnited Airlines
Deal found 1/6$1,869
Sat 7/617:45SYD - MDW
2 stops35h 04mMultiple Airlines
Thu 19/607:40MDW - SYD
2 stops32h 50mMultiple Airlines
Deal found 1/6$1,880
Thu 19/609:25SYD - STL
2 stops29h 03mDelta
Sun 3/815:59STL - SYD
2 stops23h 36mDelta
Deal found 1/6$1,883
Tue 3/609:20SYD - ORD
2 stops37h 39mAir Canada
Wed 11/615:35ORD - SYD
1 stop24h 45mAir Canada
Deal found 1/6$1,905
Mon 21/710:10SYD - ORD
1 stop43h 15mCathay Pacific
Mon 28/716:00ORD - SYD
1 stop27h 50mCathay Pacific
Deal found 1/6$1,967
Wed 8/1010:25SYD - MDW
2 stops24h 11mDelta
Wed 15/1013:05MDW - SYD
2 stops26h 30mDelta
Deal found 2/6$2,107

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 2 June 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

Fri 5/9

13:15-23:04

2 stops24h 49m

Chicago O'Hare Intl

Fri 12/9

06:20-11:45

2 stops38h 25m

$1,661

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:20-20:00

2 stops49h 40m

Lambert-St Louis

Sat 8/11

13:35-09:35

2 stops27h 00m

$1,673

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 16/7

09:30-14:42

1 stop20h 12m

Chicago O'Hare Intl

Wed 23/7

16:20-07:00

2 stops23h 40m

$1,709

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 23/6

11:50-04:51

2 stops32h 01m

Chicago O'Hare Intl

Tue 29/7

17:45-19:15

1 stop34h 30m

$1,745

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

12:10-16:08

1 stop18h 58m

Lambert-St Louis

Sat 8/11

06:15-09:00

1 stop33h 45m

$1,836

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 20/6

09:10-23:35

1 stop29h 25m

Chicago O'Hare Intl

Tue 22/7

13:23-07:05

2 stops26h 42m

$1,847

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 8/10

10:20-20:11

2 stops25h 51m

Chicago O'Hare Intl

Wed 15/10

10:40-08:20

2 stops29h 40m

$1,864

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 15/6

10:20-23:59

2 stops28h 39m

Lambert-St Louis

Sun 3/8

16:45-07:00

2 stops23h 15m

$1,869

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 19/6

09:25-23:28

2 stops29h 03m

Lambert-St Louis

Sun 3/8

15:59-06:35

2 stops23h 36m

$1,883

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 21/7

10:10-14:25

1 stop43h 15m

Chicago O'Hare Intl

Mon 28/7

16:00-10:50

1 stop27h 50m

$1,967

Flights are sorted by cheapest return flights first.

Deals found on 1/6

Showing 1-10 of 28 results
1
2
3

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 9 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 $1,102
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 2 June 2025.
Get a feel of what it's like to fly with Japan Airlines, ANA and Fiji Airways 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.
Japan Airlines
8.3
Very Good
1,481 reviews
Check prices

Entertainment

7.8

Food

7.7

Boarding

8.4

Overall

8.3

Crew

8.7

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.
Japan Airlines
8.3
Very Good
1,481 reviews
Japan Airlines
8.3
Very Good
1,481 reviews
Check prices

Entertainment

7.8

Food

7.7

Boarding

8.4

Overall

8.3

Crew

8.7

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.
ANA
8.3
Very Good
876 reviews
Japan Airlines
8.3
Very Good
1,481 reviews
Check prices

Entertainment

7.8

Food

7.7

Boarding

8.4

Overall

8.3

Crew

8.7

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.
Fiji Airways
8.1
Very Good
194 reviews
Japan Airlines
8.3
Very Good
1,481 reviews
Check prices

Entertainment

7.8

Food

7.7

Boarding

8.4

Overall

8.3

Crew

8.7

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.
Delta
8.0
Very Good
7,955 reviews
Japan Airlines
8.3
Very Good
1,481 reviews
Check prices

Entertainment

7.8

Food

7.7

Boarding

8.4

Overall

8.3

Crew

8.7

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.
Air New Zealand
8.0
Very Good
481 reviews
Japan Airlines
8.3
Very Good
1,481 reviews
Check prices

Entertainment

7.8

Food

7.7

Boarding

8.4

Overall

8.3

Crew

8.7

Comfort

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,May 2025

DEL - HND

1. No information on business class lounge access in Delhi airport. 2. Special meals ordered confirmed in JAL website but not in confirmation email. So meal Was not served on the flight.

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 $167.

  • 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 (22 hours 38 minutes).

  • Which airport is closest to Union Park Congregational Church and Carpenter Chapel?

    f being close to Union Park Congregational Church and Carpenter Chapel is important to you, you’ll want to land at Chicago O'Hare Intl Airport.

  • 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
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