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$894+ 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 13/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
1 Apr — 8 Apr1
1 adult
1 adult, Economy, 0 bags

Flights to Illinois in 2026

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 2 March 2026.

Thu 16/413:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Thu 23/414:00
ORD
-
SYD
2 stops30h 50m
Multiple Airlines
Deal found 2/3$1,440
Tue 14/409:10
SYD
-
STL
1 stop29h 47m
Qantas Airways
Tue 21/406:21
STL
-
SYD
1 stop33h 44m
Qantas Airways
Deal found 28/2$1,453
Thu 14/509:10
SYD
-
STL
1 stop29h 49m
American Airlines
Sat 6/614:58
STL
-
SYD
2 stops25h 07m
American Airlines
Deal found 25/2$1,456
Fri 17/413:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Fri 24/414:00
ORD
-
SYD
2 stops30h 50m
Multiple Airlines
Deal found 2/3$1,481
Thu 12/311:20
SYD
-
STL
1 stop28h 38m
Qantas Airways
Sun 15/306:38
STL
-
SYD
1 stop34h 22m
Qantas Airways
Deal found 25/2$1,502
Thu 12/311:20
SYD
-
STL
2 stops28h 24m
American Airlines
Mon 16/309:37
STL
-
SYD
2 stops31h 23m
American Airlines
Deal found 26/2$1,504
Tue 14/409:10
SYD
-
STL
1 stop29h 47m
American Airlines
Tue 21/415:38
STL
-
SYD
2 stops24h 27m
American Airlines
Deal found 28/2$1,505
Thu 6/812:00
SYD
-
STL
1 stop19h 51m
American Airlines
Sun 30/815:33
STL
-
SYD
2 stops24h 32m
American Airlines
Deal found 28/2$1,515
Mon 13/412:00
SYD
-
STL
1 stop25h 59m
American Airlines
Mon 20/406:21
STL
-
SYD
1 stop33h 44m
American Airlines
Deal found 26/2$1,523
Thu 6/812:00
SYD
-
STL
1 stop19h 51m
Qantas Airways
Sun 30/819:46
STL
-
SYD
1 stop20h 09m
Qantas Airways
Deal found 26/2$1,525
Thu 12/311:50
SYD
-
STL
1 stop20h 15m
United Airlines
Mon 16/316:47
STL
-
SYD
1 stop22h 13m
United Airlines
Deal found 25/2$1,528
Tue 3/311:50
SYD
-
STL
2 stops22h 54m
United Airlines
Tue 10/313:14
STL
-
SYD
2 stops26h 51m
United Airlines
Deal found 1/3$1,529

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 March 2026
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 2026, 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 March 2026.

Return from

$1,440

One-way from

$861

Popular in

December

Cheapest in

April

Average price

$1,217
16/4-23/4
  • 16/4-23/4
  • 4 total stops
  • 56h 02m total
  • Sydney to Chicago
Search Deals
Qantas Airways
  • Qantas Airways
  • 18/3
  • 2 total stops
  • 26h 43m total
  • Sydney to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($231 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($37 potential savings vs. average return price).
Search Deals
Average for return flights in March 2026
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 2 March 2026.
Use the filters below to find and compare flights to Illinois that are best for you.

Fly from

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

11:20-17:53

2 stops22h 33m

Lambert-St Louis

Mon 16/3

06:38-09:00

1 stop34h 22m

$1,502

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/8

12:00-16:51

1 stop19h 51m

Lambert-St Louis

Sun 30/8

19:46-06:55

1 stop20h 09m

$1,505

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/8

12:00-16:51

1 stop19h 51m

Lambert-St Louis

Sun 30/8

15:33-07:05

2 stops24h 32m

$1,515

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

11:50-16:05

1 stop20h 15m

Lambert-St Louis

Mon 16/3

16:47-07:00

1 stop22h 13m

$1,528

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/8

09:30-20:43

2 stops26h 13m

Lambert-St Louis

Sun 30/8

15:10-07:00

2 stops24h 50m

$1,530

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 27/4

09:10-23:57

1 stop29h 47m

Lambert-St Louis

Fri 1/5

14:37-07:05

2 stops25h 28m

$1,545

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 14/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Sat 6/6

19:23-06:55

1 stop20h 32m

$1,569

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Fri 17/4

17:50-05:35

1 stop26h 45m

Chicago O'Hare Intl

Fri 24/4

14:00-07:30

1 stop26h 30m

$1,701

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Mon 22/6

09:30-17:05

2 stops22h 35m

Chicago O'Hare Intl

Sun 19/7

18:20-06:55

1 stop21h 35m

$1,737

SydneyChicago

SYD - ORD

SYDORD

Sydney Kingsford Smith

Wed 1/7

09:30-17:05

2 stops22h 35m

Chicago O'Hare Intl

Sun 19/7

14:29-06:55

1 stop25h 26m

$1,737

Flights are sorted by cheapest return flights first.

Deals found on 27/2

Showing 1-10 of 30 resultsSorted by cheapest first
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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 2 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.

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 $794
United Airlines
United Airlines
From $1,260
Air Canada
Air Canada
From $1,066
Air New Zealand
Air New Zealand
From $1,084

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from Sydney to Illinois are Qantas Airways, Air Canada 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 2 March 2026.
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
606 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Comfort

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Marsha,Feb 2026

LAX - AKL

Air New Zealand is a great airline. Airline staff made us feel welcome and flight attendants were attentive and kind.
Air New Zealand
8.0
Very Good
606 reviews
Air New Zealand
8.0
Very Good
606 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Comfort

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Marsha,Feb 2026

LAX - AKL

Air New Zealand is a great airline. Airline staff made us feel welcome and flight attendants were attentive and kind.
Qantas Airways
7.5
Good
1,000 reviews
Air New Zealand
8.0
Very Good
606 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Comfort

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Marsha,Feb 2026

LAX - AKL

Air New Zealand is a great airline. Airline staff made us feel welcome and flight attendants were attentive and kind.
United Airlines
7.4
Good
9,375 reviews
Air New Zealand
8.0
Very Good
606 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Comfort

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Marsha,Feb 2026

LAX - AKL

Air New Zealand is a great airline. Airline staff made us feel welcome and flight attendants were attentive and kind.
American Airlines
7.1
Good
11,369 reviews
Air New Zealand
8.0
Very Good
606 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Comfort

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Marsha,Feb 2026

LAX - AKL

Air New Zealand is a great airline. Airline staff made us feel welcome and flight attendants were attentive and kind.
Air Canada
7.1
Good
10,764 reviews
Air New Zealand
8.0
Very Good
606 reviews
Check prices

Entertainment

7.4

Overall

8.0

Food

7.4

Comfort

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Marsha,Feb 2026

LAX - AKL

Air New Zealand is a great airline. Airline staff made us feel welcome and flight attendants were attentive and kind.

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 $81, while return flights cost around $353.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around $467, however they can be found for as little as $353.

  • 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 34 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.

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