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$726+ 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 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
25 Mar — 1 Apr1
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 20 March 2025.

Return from

$1,547

One-way from

$726

Popular in

December

Cheapest in

February

Average price

$1,429
24/5-31/5
  • 24/5-31/5
  • 4 total stops
  • 62h 55m total
  • Sydney to Chicago
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1/5
  • 1/5
  • 2 total stops
  • 22h 39m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($440 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease ($102 potential savings vs. average return price).
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Average for return flights in March 2025
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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 20 March 2025.

Tue 29/709:20SYD - ORD
1 stop20h 29mAir Canada
Tue 5/810:40ORD - SYD
2 stops29h 40mAir Canada
Deal found 18/3$1,319
Thu 24/409:10SYD - ORD
1 stop35h 04mBritish Airways
Wed 7/506:00ORD - SYD
1 stop33h 55mBritish Airways
Deal found 20/3$1,491
Sat 24/513:45SYD - ORD
2 stops24h 20mMultiple Airlines
Sat 31/506:10ORD - SYD
2 stops38h 35mMultiple Airlines
Deal found 20/3$1,547
Tue 6/521:30SYD - ORD
1 stop31h 52mAmerican Airlines
Thu 15/508:39ORD - SYD
1 stop31h 26mAmerican Airlines
Deal found 19/3$1,574
Mon 18/809:20SYD - STL
2 stops45h 01mAir Canada
Sat 8/1116:15STL - SYD
2 stops48h 20mAir Canada
Deal found 19/3$1,585
Mon 18/817:45SYD - STL
2 stops45h 03mAmerican Airlines
Sat 8/1116:07STL - SYD
1 stop21h 48mAmerican Airlines
Deal found 19/3$1,656
Wed 26/311:15SYD - ORD
1 stop28h 44mQantas Airways
Sun 6/415:17ORD - SYD
1 stop24h 48mQantas Airways
Deal found 20/3$1,705
Mon 12/510:20SYD - STL
1 stop21h 49mUnited Airlines
Sat 31/517:27STL - SYD
2 stops46h 33mUnited Airlines
Deal found 20/3$1,729
Wed 26/311:20SYD - ORD
2 stops24h 47mUnited Airlines
Wed 9/418:25ORD - SYD
1 stop21h 30mUnited Airlines
Deal found 20/3$1,729
Mon 12/517:45SYD - STL
1 stop20h 19mMultiple Airlines
Sat 31/519:19STL - SYD
1 stop20h 36mMultiple Airlines
Deal found 20/3$1,788
Sat 17/509:25SYD - MDW
2 stops23h 22mDelta
Sat 14/610:10MDW - SYD
2 stops29h 25mDelta
Deal found 20/3$1,892
Thu 3/408:40SYD - ORD
1 stop45h 45mCathay Pacific
Thu 17/416:00ORD - SYD
1 stop27h 50mCathay Pacific
Deal found 19/3$1,900

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 20 March 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

Tue 29/7

09:20-14:49

1 stop20h 29m

Chicago O'Hare Intl

Tue 5/8

10:40-07:20

2 stops29h 40m

$1,319

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Thu 24/4

09:10-05:14

1 stop35h 04m

Chicago O'Hare Intl

Wed 7/5

06:00-06:55

1 stop33h 55m

$1,491

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Sat 24/5

13:45-23:05

2 stops24h 20m

Chicago O'Hare Intl

Sat 31/5

06:10-11:45

2 stops38h 35m

$1,547

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 6/5

21:30-14:22

1 stop31h 52m

Chicago O'Hare Intl

Thu 15/5

08:39-07:05

1 stop31h 26m

$1,574

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

09:20-15:21

2 stops45h 01m

Lambert-St Louis

Sat 8/11

16:15-09:35

2 stops48h 20m

$1,585

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

17:45-23:48

2 stops45h 03m

Lambert-St Louis

Sat 8/11

16:07-06:55

1 stop21h 48m

$1,656

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 7/5

09:10-15:55

1 stop21h 45m

Chicago O'Hare Intl

Tue 13/5

19:13-07:05

1 stop20h 52m

$1,710

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 12/5

10:20-17:09

1 stop21h 49m

Lambert-St Louis

Sat 31/5

17:27-07:00

2 stops46h 33m

$1,729

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Tue 22/4

09:30-00:15

2 stops29h 45m

Chicago O'Hare Intl

Tue 29/4

17:50-07:00

1 stop22h 10m

$1,729

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 12/5

17:45-23:04

1 stop20h 19m

Lambert-St Louis

Sat 31/5

19:19-06:55

1 stop20h 36m

$1,788

Flights are sorted by cheapest return flights first.

Deals found on 20/3

Showing 1-10 of 34 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 21 hours 58 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 ANA.

Qantas Airways

Qantas Airways

From $642

Air Canada

Air Canada

From $946

ANA

ANA

From $864

United Airlines

United Airlines

From $993

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from Sydney to Illinois are Qantas Airways, ANA and Air New Zealand.

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 20 March 2025.
Get a feel of what it's like to fly with Air Tahiti Nui, Korean Air and Japan Airlines 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.
Air Tahiti Nui
8.7
Very Good
61 reviews
Check prices

Entertainment

7.2

Overall

8.7

Food

7.8

Boarding

8.7

Comfort

8.0

Crew

9.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Air Tahiti Nui
8.7
Very Good
61 reviews
Air Tahiti Nui
8.7
Very Good
61 reviews
Check prices

Entertainment

7.2

Overall

8.7

Food

7.8

Boarding

8.7

Comfort

8.0

Crew

9.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Korean Air
8.4
Very Good
1,045 reviews
Air Tahiti Nui
8.7
Very Good
61 reviews
Check prices

Entertainment

7.2

Overall

8.7

Food

7.8

Boarding

8.7

Comfort

8.0

Crew

9.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Japan Airlines
8.3
Very Good
1,437 reviews
Air Tahiti Nui
8.7
Very Good
61 reviews
Check prices

Entertainment

7.2

Overall

8.7

Food

7.8

Boarding

8.7

Comfort

8.0

Crew

9.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
ANA
8.3
Very Good
828 reviews
Air Tahiti Nui
8.7
Very Good
61 reviews
Check prices

Entertainment

7.2

Overall

8.7

Food

7.8

Boarding

8.7

Comfort

8.0

Crew

9.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.
Emirates
8.0
Very Good
3,194 reviews
Air Tahiti Nui
8.7
Very Good
61 reviews
Check prices

Entertainment

7.2

Overall

8.7

Food

7.8

Boarding

8.7

Comfort

8.0

Crew

9.1

Reviews

1 / 2
10.0
Excellent

Isabelle,Apr 2023

AKL - PPT

Les sièges sont étroits, je mesure 1,77 m, les passants dans le couloirs notamment l'équipage n'arrêtaient pas de me cogner. nous étions en économie. l'équipage est au top. C'est le confort qui était négatif pour nous.

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, American Airlines 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 $74, while return flights cost around $186.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $655, however they can be found for as little as $118.

  • Where does the fastest flight to Illinois depart from?

    For those looking to save time traveling to Illinois, Melbourne offers the quickest one-way flight (20 hours 19 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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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.

Can Cheapflights notify me if prices for flights to Illinois become cheaper?

Yes! Start tracking prices for Illinois flights today and get alerted when prices change. To subscribe and begin receiving alerts, click the bell icon next to the flight deals above and provide your email address.

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