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Cheap flights from Illinois to Sydney from $726

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 17/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
9 Jul — 16 Jul1
1 adult

Cheap flight deals from Illinois to Sydney

Keep the following information in mind while searching for Illinois to Sydney flight deals. Data was last updated 4 July 2025.

Round-trip from

$1,453

One-way from

$726

Popular in

December

Cheapest in

August

Average price

$1,739
United Airlines
  • United Airlines
  • 16/8-23/8
  • 4 total stops
  • 57h 42m total
  • Illinois to Sydney
Search Deals
17/8
  • 17/8
  • 2 total stops
  • 35h 04m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($427 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($101 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Illinois to Sydney

Cheapest flights from Illinois to Sydney
Explore the most affordable flight options available from Illinois to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 July 2025.

Sat 16/809:00PIA - SYD
2 stops31h 00mUnited Airlines
Sat 23/809:30SYD - PIA
2 stops26h 42mUnited Airlines
Deal found 1/7$1,453
Tue 26/815:20ORD - SYD
2 stops32h 20mMultiple Airlines
Sun 7/917:45SYD - ORD
1 stop39h 26mMultiple Airlines
Deal found 2/7$1,572
Fri 28/1106:15STL - SYD
2 stops34h 05mQantas Airways
Sun 14/1214:20SYD - STL
1 stop18h 47mQantas Airways
Deal found 3/7$1,716
Wed 29/1010:00ORD - SYD
2 stops29h 25mAlaska Airlines
Wed 12/1117:45SYD - ORD
2 stops28h 16mAlaska Airlines
Deal found 3/7$1,724
Tue 26/820:20ORD - SYD
2 stops31h 55mANA
Sun 7/920:55SYD - ORD
2 stops34h 02mANA
Deal found 2/7$1,744
Sun 14/913:30STL - SYD
2 stops26h 50mMultiple Airlines
Sat 27/909:20SYD - STL
2 stops22h 12mMultiple Airlines
Deal found 2/7$1,744
Thu 21/809:15STL - SYD
2 stops31h 05mAir Canada
Wed 3/909:20SYD - STL
2 stops44h 58mAir Canada
Deal found 3/7$1,750
Fri 1/817:27STL - SYD
1 stop22h 28mAmerican Airlines
Thu 14/809:10SYD - STL
2 stops22h 36mAmerican Airlines
Deal found 2/7$1,768
Sun 14/917:49STL - SYD
1 stop22h 06mUnited Airlines
Sat 27/910:20SYD - STL
1 stop21h 25mUnited Airlines
Deal found 2/7$1,797
Sat 16/817:52STL - SYD
2 stops26h 53mFiji Airways
Sat 23/813:45SYD - STL
2 stops21h 37mFiji Airways
Deal found 2/7$1,984
Sat 23/808:46STL - SYD
2 stops30h 49mDelta
Wed 27/809:25SYD - STL
2 stops22h 20mDelta
Deal found 2/7$2,027
Wed 19/1110:35MDW - SYD
2 stops28h 55mDelta
Mon 1/1210:40SYD - MDW
2 stops24h 56mDelta
Deal found 3/7$2,231

Cheapflights Fare Finder

Customise your flight search to find flights from Illinois to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 4 July 2025.
Use the filters below to find and compare flights from Illinois to Sydney that are best for you.

Fly from

Illinois

Fly to

Sydney

Route

Depart

Return

Price

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Sat 16/8

09:00-07:00

2 stops31h 00m

Sydney Kingsford Smith

Sat 23/8

09:30-21:12

2 stops26h 42m

$1,453

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 26/8

15:20-14:40

2 stops32h 20m

Sydney Kingsford Smith

Sun 7/9

17:45-18:11

1 stop39h 26m

$1,572

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

06:15-09:20

2 stops34h 05m

Sydney Kingsford Smith

Sun 14/12

14:20-16:07

1 stop18h 47m

$1,716

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 29/10

10:00-07:25

2 stops29h 25m

Sydney Kingsford Smith

Wed 12/11

17:45-05:01

2 stops28h 16m

$1,724

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 26/8

20:20-19:15

2 stops31h 55m

Sydney Kingsford Smith

Sun 7/9

20:55-15:57

2 stops34h 02m

$1,744

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/9

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Sat 27/9

09:20-16:32

2 stops22h 12m

$1,744

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 21/8

09:15-07:20

2 stops31h 05m

Sydney Kingsford Smith

Wed 3/9

09:20-15:18

2 stops44h 58m

$1,750

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 1/8

17:27-06:55

1 stop22h 28m

Sydney Kingsford Smith

Thu 14/8

09:10-16:46

2 stops22h 36m

$1,768

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/9

17:49-06:55

1 stop22h 06m

Sydney Kingsford Smith

Sat 27/9

10:20-16:45

1 stop21h 25m

$1,797

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 15/8

06:41-07:30

2 stops33h 49m

Sydney Kingsford Smith

Fri 22/8

17:45-14:39

2 stops35h 54m

$1,976

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Showing 1-10 of 33 results
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Best time to book a flight from Illinois to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from 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 from Illinois to Sydney

What is the cheapest month to book a flight from Illinois to Sydney?

Currently, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to SYD?

Find hourly flight availability from Illinois to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 July 2025.

When flying from Illinois to Sydney, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated 4 July 2025.
Get a feel of what it's like to fly with ANA, Korean Air, andAlaska Airlines from Illinois to Sydney by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very Good
886 reviews
Check prices

Comfort

8.2

Boarding

8.5

Overall

8.4

Entertainment

7.9

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
ANA
8.4
Very Good
886 reviews
ANA
8.4
Very Good
886 reviews
Check prices

Comfort

8.2

Boarding

8.5

Overall

8.4

Entertainment

7.9

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Korean Air
8.4
Very Good
1,101 reviews
ANA
8.4
Very Good
886 reviews
Check prices

Comfort

8.2

Boarding

8.5

Overall

8.4

Entertainment

7.9

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Alaska Airlines
8.0
Very Good
10,000 reviews
ANA
8.4
Very Good
886 reviews
Check prices

Comfort

8.2

Boarding

8.5

Overall

8.4

Entertainment

7.9

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Fiji Airways
8.0
Very Good
202 reviews
ANA
8.4
Very Good
886 reviews
Check prices

Comfort

8.2

Boarding

8.5

Overall

8.4

Entertainment

7.9

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Delta
8.0
Very Good
7,970 reviews
ANA
8.4
Very Good
886 reviews
Check prices

Comfort

8.2

Boarding

8.5

Overall

8.4

Entertainment

7.9

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sydney from Illinois?

    Located just 7.5 km from the city centre, Sydney Kingsford Smith (SYD) is the airport most travelers will use when flying to Sydney from Illinois.

  • What are the cheapest airlines to fly from Illinois to Sydney one-way?

    One-way options have recently been found by users for as low as $838 on Alaska Airlines. Other airlines that offer cheap prices include Fiji Airways from $1,036 and ANA from $1,051 one-way.

  • What are the most popular routes from Illinois to Sydney?

    When deciding which route to take from Illinois to Sydney, consider Chicago O'Hare Intl - Sydney Kingsford Smith, Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, as they are the most popular.

  • Can I find deals for flights from Illinois to Sydney that include hotel bookings?

    Yes. In addition to deals on Illinois to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Sydney.

  • Can I find deals for business class flights from Illinois to Sydney?

    Yes. Cheapflights offers flight deals from Illinois to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Sydney?

    Currently, May is the cheapest month in which you can book a flight from Illinois to Sydney (average of $129). Flying from Illinois to Sydney in October is currently the most expensive (average of $171). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
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Bondi Beach
Leura

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Top 2 airlines flying from Illinois to Sydney

Discover the top 2 airlines that operate flights from Illinois to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 4 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,299Average$1,400FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,662Average$1,793FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Illinois to Sydney?

When you search for this flight from Illinois to Sydney, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Illinois to Sydney with no change fees?

Yes! Cheapflights helps users easily find flights from Illinois to Sydney with no change fees.

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