Find flights
When to book
Airlines
FAQs

Cheap flights from Illinois to Sydney from $657

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 15/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
29 Apr — 6 May1
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 24 April 2025.

Round-trip from

$1,626

One-way from

$657

Popular in

December

Cheapest in

August

Average price

$1,372
5/6-12/6
  • 5/6-12/6
  • 4 total stops
  • 75h 11m total
  • Illinois to Sydney
Search Deals
15/5
  • 15/5
  • 2 total stops
  • 30h 30m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($371 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($89 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 24 April 2025.

Thu 5/607:40MDW - SYD
2 stops37h 35mMultiple Airlines
Thu 12/613:15SYD - MDW
2 stops37h 36mMultiple Airlines
Deal found 23/4$1,626
Thu 5/611:45ORD - SYD
3 stops33h 30mMultiple Airlines
Thu 12/613:15SYD - ORD
3 stops32h 36mMultiple Airlines
Deal found 22/4$1,688
Sat 10/518:45ORD - SYD
2 stops26h 00mFiji Airways
Tue 27/513:15SYD - ORD
2 stops22h 09mFiji Airways
Deal found 23/4$1,782
Tue 2/1214:25ORD - SYD
2 stops30h 45mQantas Airways
Sun 21/1206:05SYD - ORD
2 stops26h 16mQantas Airways
Deal found 24/4$1,846
Sun 26/1017:35ORD - SYD
1 stop34h 40mANA
Mon 24/1121:45SYD - ORD
1 stop26h 35mANA
Deal found 24/4$1,857
Tue 26/816:30ORD - SYD
2 stops27h 05mAir New Zealand
Tue 2/911:50SYD - ORD
2 stops26h 25mAir New Zealand
Deal found 22/4$1,920
Thu 11/919:59STL - SYD
2 stops25h 16mFiji Airways
Tue 30/913:15SYD - STL
2 stops24h 12mFiji Airways
Deal found 24/4$1,940
Wed 20/811:05STL - SYD
2 stops30h 40mAir New Zealand
Wed 3/911:50SYD - STL
2 stops25h 26mAir New Zealand
Deal found 23/4$1,984
Wed 22/1016:00ORD - SYD
1 stop27h 50mCathay Pacific
Wed 29/1022:20SYD - ORD
1 stop31h 40mCathay Pacific
Deal found 23/4$2,065
Wed 15/1015:35ORD - SYD
1 stop24h 45mAir Canada
Wed 29/1010:20SYD - ORD
1 stop20h 19mAir Canada
Deal found 23/4$2,071
Wed 20/816:40STL - SYD
3 stops26h 55mMultiple Airlines
Wed 3/911:50SYD - STL
2 stops25h 26mMultiple Airlines
Deal found 23/4$2,122
Wed 4/615:17ORD - SYD
2 stops37h 28mAlaska Airlines
Tue 10/621:40SYD - ORD
2 stops23h 00mAlaska Airlines
Deal found 23/4$2,230

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 24 April 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

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Thu 5/6

07:40-12:15

2 stops37h 35m

Sydney Kingsford Smith

Thu 12/6

13:15-11:51

2 stops37h 36m

$1,626

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 5/6

11:45-12:15

3 stops33h 30m

Sydney Kingsford Smith

Thu 12/6

13:15-06:51

3 stops32h 36m

$1,688

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 10/5

18:45-11:45

2 stops26h 00m

Sydney Kingsford Smith

Tue 27/5

13:15-20:24

2 stops22h 09m

$1,782

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 21/10

17:45-10:25

1 stop24h 40m

Sydney Kingsford Smith

Fri 31/10

12:25-05:03

2 stops32h 38m

$1,857

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 26/8

16:30-10:35

2 stops27h 05m

Sydney Kingsford Smith

Tue 2/9

11:50-23:15

2 stops26h 25m

$1,920

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 11/9

19:59-12:15

2 stops25h 16m

Sydney Kingsford Smith

Tue 30/9

13:15-22:27

2 stops24h 12m

$1,940

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/8

11:05-08:45

2 stops30h 40m

Sydney Kingsford Smith

Wed 3/9

11:50-22:16

2 stops25h 26m

$1,984

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 15/10

15:35-08:20

1 stop24h 45m

Sydney Kingsford Smith

Wed 29/10

10:20-08:05

2 stops37h 45m

$2,071

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 9/9

18:45-07:05

1 stop21h 20m

Sydney Kingsford Smith

Wed 24/9

09:10-14:17

1 stop20h 07m

$2,111

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/8

16:40-10:35

3 stops26h 55m

Sydney Kingsford Smith

Wed 3/9

11:50-22:16

2 stops25h 26m

$2,122

Flights are sorted by cheapest return flights first.

Deals found on 23/4

Showing 1-10 of 52 results
1
2
3
...
6

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 24 April 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.

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

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 24 April 2025.
Peruse reviews from past customers who have flown with Air Tahiti Nui, Korean Air and Japan Airlines from Illinois to Sydney to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Food

7.8

Comfort

8.1

Crew

9.1

Overall

8.8

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
8.8
Very Good
62 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Food

7.8

Comfort

8.1

Crew

9.1

Overall

8.8

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
1,063 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Food

7.8

Comfort

8.1

Crew

9.1

Overall

8.8

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
1,453 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Food

7.8

Comfort

8.1

Crew

9.1

Overall

8.8

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
853 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Food

7.8

Comfort

8.1

Crew

9.1

Overall

8.8

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.
Fiji Airways
8.1
Very Good
188 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Boarding

8.7

Entertainment

7.3

Food

7.8

Comfort

8.1

Crew

9.1

Overall

8.8

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.

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 $983 on Fiji Airways. Other airlines that offer cheap prices include ANA from $1,081 and Qantas Airways from $1,255 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
Parramatta
Wollongong
Katoomba
Manly
Penrith
Coogee
Randwick
Terrigal
Cronulla
Lithgow
Bondi Beach
Leura
Swansea

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Sydney flights
John F Kennedy Intl to Sydney flights
San Francisco to Sydney flights
Dallas/Fort Worth to Sydney flights
Newark to Sydney flights
Seattle to Sydney flights
Dulles Intl to Sydney flights
O'Hare Intl to Sydney flights
Hobby to Sydney flights
Reagan-National to Sydney flights
Baltimore to Sydney flights
Boston to Sydney flights
Atlanta to Sydney flights
Honolulu to Sydney flights
George Bush Intcntl to Sydney flights
Midway to Sydney flights
Denver to Sydney flights
San Jose to Sydney flights
Minneapolis to Sydney flights
Oakland to Sydney flights
Detroit to Sydney flights
Orlando to Sydney flights
Miami to Sydney flights
Sky Harbor Intl to Sydney flights
Philadelphia to Sydney flights
Charlotte to Sydney flights
Raleigh to Sydney flights
Portland to Sydney flights
San Diego to Sydney flights
Salt Lake City to Sydney flights
Austin to Sydney flights
Kansas City to Sydney flights
Nashville to Sydney flights
Tampa to Sydney flights
Cincinnati to Sydney flights
Indianapolis to Sydney flights
Fort Lauderdale to Sydney flights
Las Vegas to Sydney flights
Columbus to Sydney flights
Seattle to Coolangatta flights
St. Louis to Sydney flights
Love Field to Sydney flights
Pittsburgh to Sydney flights
Los Angeles to Coolangatta flights
San Antonio to Sydney flights

Top 3 airlines flying from Illinois to Sydney

Discover the top 3 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 24 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,335Average$1,440FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,709Average$1,847FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,882Average$2,667FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

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

Of course! You can now track prices for flights from Illinois to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights