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Cheap flights from Illinois to Sydney from $793

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 21/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
5 May — 12 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 30 April 2025.

Round-trip from

$1,808

One-way from

$793

Popular in

December

Cheapest in

August

Average price

$1,369
5/6-12/6
  • 5/6-12/6
  • 3 total stops
  • 60h 29m total
  • Illinois to Sydney
Search Deals
21/6
  • 21/6
  • 2 total stops
  • 34h 50m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($382 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($96 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 30 April 2025.

Thu 5/615:17ORD - SYD
2 stops32h 23mMultiple Airlines
Thu 12/617:45SYD - ORD
1 stop28h 06mMultiple Airlines
Deal found 29/4$1,808
Tue 2/1214:25ORD - SYD
2 stops29h 50mQantas Airways
Sun 21/1206:05SYD - ORD
2 stops30h 13mQantas Airways
Deal found 30/4$1,842
Tue 21/1017:45ORD - SYD
1 stop34h 30mANA
Fri 31/1012:25SYD - ORD
2 stops32h 38mANA
Deal found 29/4$1,852
Sun 17/815:35ORD - SYD
2 stops26h 10mAir New Zealand
Mon 1/909:55SYD - ORD
2 stops28h 20mAir New Zealand
Deal found 30/4$1,867
Mon 9/619:47STL - SYD
1 stop20h 08mQantas Airways
Fri 20/609:10SYD - STL
1 stop28h 49mQantas Airways
Deal found 28/4$1,959
Wed 20/817:49STL - SYD
2 stops23h 56mAir New Zealand
Wed 3/909:55SYD - STL
2 stops27h 21mAir New Zealand
Deal found 28/4$1,969
Sat 18/1019:03ORD - SYD
2 stops25h 42mFiji Airways
Sat 25/1014:45SYD - ORD
2 stops22h 17mFiji Airways
Deal found 30/4$1,981
Wed 17/916:00ORD - SYD
1 stop27h 50mCathay Pacific
Tue 30/921:50SYD - ORD
1 stop31h 35mCathay Pacific
Deal found 29/4$2,061
Tue 24/613:21STL - SYD
2 stops25h 44mAmerican Airlines
Tue 8/717:45SYD - STL
1 stop20h 36mAmerican Airlines
Deal found 29/4$2,073
Thu 5/607:30STL - SYD
2 stops32h 50mAir Canada
Thu 12/609:20SYD - STL
2 stops42h 16mAir Canada
Deal found 28/4$2,102
Wed 20/816:40STL - SYD
3 stops26h 55mMultiple Airlines
Wed 3/909:55SYD - STL
2 stops27h 21mMultiple Airlines
Deal found 28/4$2,117
Mon 9/613:42STL - SYD
2 stops26h 13mUnited Airlines
Fri 20/610:20SYD - STL
1 stop22h 40mUnited Airlines
Deal found 28/4$2,119

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 30 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

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 5/6

15:17-14:40

2 stops32h 23m

Sydney Kingsford Smith

Thu 12/6

17:45-06:51

1 stop28h 06m

$1,808

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 21/10

17:45-20:15

1 stop34h 30m

Sydney Kingsford Smith

Fri 31/10

12:25-05:03

2 stops32h 38m

$1,852

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 17/8

15:35-08:45

2 stops26h 10m

Sydney Kingsford Smith

Mon 1/9

09:55-23:15

2 stops28h 20m

$1,867

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/6

19:47-06:55

1 stop20h 08m

Sydney Kingsford Smith

Fri 20/6

09:10-22:59

1 stop28h 49m

$1,959

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/8

17:49-08:45

2 stops23h 56m

Sydney Kingsford Smith

Wed 3/9

09:55-22:16

2 stops27h 21m

$1,969

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 18/10

19:03-12:45

2 stops25h 42m

Sydney Kingsford Smith

Sat 25/10

14:45-21:02

2 stops22h 17m

$1,981

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 17/9

16:00-10:50

1 stop27h 50m

Sydney Kingsford Smith

Tue 30/9

21:50-14:25

1 stop31h 35m

$2,061

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 24/6

13:21-06:05

2 stops25h 44m

Sydney Kingsford Smith

Tue 8/7

17:45-23:21

1 stop20h 36m

$2,073

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 16/8

15:24-14:40

2 stops32h 16m

Sydney Kingsford Smith

Sat 30/8

13:45-23:14

2 stops24h 29m

$2,097

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 5/6

07:30-07:20

2 stops32h 50m

Sydney Kingsford Smith

Thu 12/6

09:20-12:36

2 stops42h 16m

$2,102

Flights are sorted by cheapest return flights first.

Deals found on 29/4

Showing 1-10 of 52 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 30 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 30 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

Overall

8.8

Entertainment

7.3

Food

7.8

Crew

9.1

Comfort

8.1

Boarding

8.7

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

Overall

8.8

Entertainment

7.3

Food

7.8

Crew

9.1

Comfort

8.1

Boarding

8.7

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
1,066 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Overall

8.8

Entertainment

7.3

Food

7.8

Crew

9.1

Comfort

8.1

Boarding

8.7

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
1,459 reviews
Air Tahiti Nui
8.8
Very Good
62 reviews
Check prices

Overall

8.8

Entertainment

7.3

Food

7.8

Crew

9.1

Comfort

8.1

Boarding

8.7

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

Overall

8.8

Entertainment

7.3

Food

7.8

Crew

9.1

Comfort

8.1

Boarding

8.7

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

Overall

8.8

Entertainment

7.3

Food

7.8

Crew

9.1

Comfort

8.1

Boarding

8.7

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 $1,079 on ANA. Other airlines that offer cheap prices include Alaska Airlines from $1,244 and Qantas Airways from $1,263 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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Katoomba
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Bondi Beach
Leura
Swansea

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Alternative routes for Illinois to Sydney

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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 30 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,333Average$1,437FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,705Average$1,843FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,878Average$2,662FlexibilityNo 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.

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