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$439+ Cheap flights from Illinois to Sydney (SYD)

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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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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 May 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,155
(Kiwi.com)

One-way from

$508
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$915
Provider with most accurate pricing for Chicago (CHI)-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Sydney Kingsford Smith flights.
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From Illinois to Sydney Kingsford Smith
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One-way flight from Illinois to Sydney Kingsford Smith
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Highest demand for flights based on searches. 12% potential increase in price ($157 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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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 May 1, 2025.

This StudentUniverse deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/28:40 amORD - SYD
2 stops32h 10mQantas Airways
Fri 11/145:30 pmSYD - ORD
2 stops22h 30mQantas Airways
Deal found 4/30$1,081
This Kiwi.com deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/117:51 pmORD - SYD
2 stops51h 49mMultiple Airlines
Wed 6/185:45 pmSYD - ORD
1 stop28h 06mMultiple Airlines
Deal found 4/30$1,155
This CrystalTravel deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/215:45 pmORD - SYD
1 stop34h 30mANA
Fri 10/3112:25 pmSYD - ORD
2 stops32h 38mANA
Deal found 4/29$1,186
This StudentUniverse deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/173:35 pmORD - SYD
2 stops26h 10mAir New Zealand
Mon 9/19:55 amSYD - ORD
2 stops28h 20mAir New Zealand
Deal found 4/30$1,196
This StudentUniverse deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/97:47 pmSTL - SYD
1 stop20h 08mQantas Airways
Fri 6/209:10 amSYD - STL
1 stop28h 49mQantas Airways
Deal found 4/28$1,255
This Gurufare deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/205:49 pmSTL - SYD
2 stops23h 56mAir New Zealand
Wed 9/39:55 amSYD - STL
2 stops27h 21mAir New Zealand
Deal found 4/28$1,261
This oojo deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:03 pmORD - SYD
2 stops25h 42mFiji Airways
Sat 10/252:45 pmSYD - ORD
2 stops22h 17mFiji Airways
Deal found 4/30$1,269
This StudentUniverse deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/174:00 pmORD - SYD
1 stop27h 50mCathay Pacific
Tue 9/309:50 pmSYD - ORD
1 stop31h 35mCathay Pacific
Deal found 4/30$1,320
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/241:21 pmSTL - SYD
2 stops25h 44mAmerican Airlines
Tue 7/85:45 pmSYD - STL
1 stop20h 36mAmerican Airlines
Deal found 4/29$1,328
This Jetabroad deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/163:24 pmSTL - SYD
2 stops32h 16mMultiple Airlines
Sat 8/301:45 pmSYD - STL
2 stops24h 29mMultiple Airlines
Deal found 4/30$1,343
This Air Canada deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/57:30 amSTL - SYD
2 stops32h 50mAir Canada
Thu 6/129:20 amSYD - STL
2 stops42h 16mAir Canada
Deal found 4/28$1,346
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/91:42 pmSTL - SYD
2 stops26h 13mUnited Airlines
Fri 6/2010:20 amSYD - STL
1 stop22h 40mUnited Airlines
Deal found 4/28$1,357

Cheapflights Fare Finder

Customize 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 2,558,603 searches. Data last updated May 1, 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

Wed 6/11

7:51 pm-2:40 pm

2 stops51h 49m

Sydney Kingsford Smith

Wed 6/18

5:45 pm-6:51 am

1 stop28h 06m

$1,155

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/21

5:45 pm-8:15 pm

1 stop34h 30m

Sydney Kingsford Smith

Fri 10/31

12:25 pm-5:03 am

2 stops32h 38m

$1,186

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/17

4:50 pm-8:45 am

2 stops24h 55m

Sydney Kingsford Smith

Mon 9/1

11:50 am-11:15 pm

2 stops26h 25m

$1,196

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/9

7:47 pm-6:55 am

1 stop20h 08m

Sydney Kingsford Smith

Fri 6/20

9:10 am-10:59 pm

1 stop28h 49m

$1,255

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 10/18

7:03 pm-12:45 pm

2 stops25h 42m

Sydney Kingsford Smith

Sat 10/25

2:45 pm-9:02 pm

2 stops22h 17m

$1,269

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 9/17

4:00 pm-10:50 am

1 stop27h 50m

Sydney Kingsford Smith

Tue 9/30

9:50 pm-2:25 pm

1 stop31h 35m

$1,320

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/24

1:21 pm-6:05 am

2 stops25h 44m

Sydney Kingsford Smith

Tue 7/8

5:45 pm-11:21 pm

1 stop20h 36m

$1,328

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 6/5

7:30 am-7:20 am

2 stops32h 50m

Sydney Kingsford Smith

Thu 6/12

9:20 am-12:36 pm

2 stops42h 16m

$1,346

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 7/2

6:53 pm-7:05 am

1 stop21h 12m

Sydney Kingsford Smith

Wed 8/13

12:10 pm-5:15 pm

1 stop20h 05m

$1,349

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/9

1:42 pm-6:55 am

2 stops26h 13m

Sydney Kingsford Smith

Fri 6/20

10:20 am-6:00 pm

1 stop22h 40m

$1,357

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 48 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 round-trip 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, March is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,043). Flying from Illinois to Sydney in December is currently the most expensive (average of $1,643). 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 May 1, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Sydney as you normally would.

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 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Sydney when rainfall is around 2.0 in.

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 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

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 May 1, 2025.
See what other customers who have flown with Air Tahiti Nui, Korean Air and Japan Airlines from Illinois to Sydney have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Tahiti Nui
8.8
Very good
62 reviews

Overall

8.8

Comfort

8.1

Boarding

8.7

Food

7.8

Crew

9.1

Entertainment

7.3

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

Overall

8.8

Comfort

8.1

Boarding

8.7

Food

7.8

Crew

9.1

Entertainment

7.3

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
1,069 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Overall

8.8

Comfort

8.1

Boarding

8.7

Food

7.8

Crew

9.1

Entertainment

7.3

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
1,464 reviews
Air Tahiti Nui
8.8
Very good
62 reviews

Overall

8.8

Comfort

8.1

Boarding

8.7

Food

7.8

Crew

9.1

Entertainment

7.3

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

Overall

8.8

Comfort

8.1

Boarding

8.7

Food

7.8

Crew

9.1

Entertainment

7.3

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

Overall

8.8

Comfort

8.1

Boarding

8.7

Food

7.8

Crew

9.1

Entertainment

7.3

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?

    If you book a flight to Sydney from Illinois, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 4.6 mi from the center of Sydney.

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

    For one-way options, check prices for Delta. According to our data, you can fly for as low as $745. Users have also found prices from $797 and $809 on Alaska Airlines and Qantas Airways, respectively.

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

    While some choose either Chicago Midway - Sydney Kingsford Smith or Lambert-St Louis - Sydney Kingsford Smith, Chicago O'Hare Intl - Sydney Kingsford Smith is the most popular route from Illinois to Sydney.

  • 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 vacation 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, March is the cheapest month in which you can book a flight from Illinois to Sydney (average of $1,043). Flying from Illinois to Sydney in December is currently the most expensive (average of $1,643). 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Wollongong
Parramatta
Coogee
Manly

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Alternative routes for Illinois to Sydney

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Top 8 airlines flying from Illinois to Sydney

Discover the top 8 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 2,558,603 searches. Data last updated May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
ANACheapest$679Average$1,011FlexibilityNo cancel feeOn-time80%
Qantas AirwaysCheapest$805Average$941FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$825Average$871FlexibilityNo cancel feeOn-time71%
DeltaCheapest$852Average$981FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$977Average$1,241FlexibilityNo cancel feeOn-time67%
Fiji AirwaysCheapest$1,021Average$1,255FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,187Average$1,473FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,235Average$1,728FlexibilityNo cancel feeOn-time78%

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