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Cheap flights from Illinois to Sydney from $697

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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
18 Jun — 25 Jun1
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 13 June 2025.

Round-trip from

$1,572

One-way from

$697

Popular in

December

Cheapest in

August

Average price

$1,420
6/9-11/9
  • 6/9-11/9
  • 5 total stops
  • 54h 40m total
  • Illinois to Sydney
Search Deals
26/8
  • 26/8
  • 2 total stops
  • 34h 39m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($428 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($105 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 13 June 2025.

Sat 6/915:21ORD - SYD
3 stops29h 24mMultiple Airlines
Thu 11/913:15SYD - ORD
2 stops25h 16mMultiple Airlines
Deal found 12/6$1,572
Wed 5/1106:15STL - SYD
2 stops43h 35mQantas Airways
Sun 23/1114:20SYD - STL
1 stop18h 49mQantas Airways
Deal found 12/6$1,653
Wed 29/1013:35STL - SYD
2 stops27h 00mMultiple Airlines
Sat 15/1111:20SYD - STL
2 stops45h 06mMultiple Airlines
Deal found 12/6$1,796
Tue 26/817:45ORD - SYD
1 stop24h 40mANA
Sun 14/911:50SYD - ORD
1 stop35h 50mANA
Deal found 13/6$1,824
Sun 14/913:39STL - SYD
2 stops26h 41mAir Canada
Sat 27/909:20SYD - STL
2 stops29h 38mAir Canada
Deal found 12/6$1,825
Tue 2/918:20ORD - SYD
2 stops26h 25mFiji Airways
Tue 14/1014:15SYD - ORD
2 stops22h 47mFiji Airways
Deal found 11/6$1,894
Wed 17/906:20ORD - SYD
2 stops34h 10mAlaska Airlines
Tue 23/917:45SYD - ORD
2 stops28h 18mAlaska Airlines
Deal found 12/6$1,924
Sun 14/919:43STL - SYD
1 stop20h 12mAmerican Airlines
Sat 27/909:10SYD - STL
2 stops23h 50mAmerican Airlines
Deal found 12/6$1,933
Mon 28/716:50ORD - SYD
2 stops26h 45mAir New Zealand
Mon 11/811:50SYD - ORD
2 stops26h 09mAir New Zealand
Deal found 11/6$2,000
Tue 29/718:15STL - SYD
2 stops25h 20mAir New Zealand
Tue 12/808:45SYD - STL
2 stops47h 00mAir New Zealand
Deal found 12/6$2,020
Wed 24/919:50ORD - SYD
2 stops32h 10mTurkish Airlines
Sun 5/1021:55SYD - ORD
2 stops40h 05mTurkish Airlines
Deal found 12/6$2,079
Tue 2/915:12ORD - SYD
1 stop24h 53mQantas Airways
Tue 30/909:10SYD - ORD
1 stop22h 37mQantas Airways
Deal found 12/6$2,094

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 13 June 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

Sat 6/9

15:21-11:45

3 stops29h 24m

Sydney Kingsford Smith

Thu 11/9

13:15-23:31

2 stops25h 16m

$1,572

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

06:15-18:50

2 stops43h 35m

Sydney Kingsford Smith

Sun 23/11

14:20-16:09

1 stop18h 49m

$1,653

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

13:35-08:35

2 stops27h 00m

Sydney Kingsford Smith

Sat 15/11

11:20-15:26

2 stops45h 06m

$1,796

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/9

13:39-07:20

2 stops26h 41m

Sydney Kingsford Smith

Sat 27/9

09:20-23:58

2 stops29h 38m

$1,825

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/9

20:20-19:15

2 stops31h 55m

Sydney Kingsford Smith

Tue 14/10

12:50-08:40

1 stop35h 50m

$1,864

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/9

18:20-11:45

2 stops26h 25m

Sydney Kingsford Smith

Tue 14/10

14:15-21:02

2 stops22h 47m

$1,894

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 22/10

06:00-07:30

2 stops33h 30m

Sydney Kingsford Smith

Wed 29/10

17:25-05:01

2 stops27h 36m

$1,922

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/9

19:43-06:55

1 stop20h 12m

Sydney Kingsford Smith

Sat 27/9

09:10-18:00

2 stops23h 50m

$1,933

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 28/7

16:50-10:35

2 stops26h 45m

Sydney Kingsford Smith

Mon 11/8

11:50-22:59

2 stops26h 09m

$2,000

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 29/7

18:15-10:35

2 stops25h 20m

Sydney Kingsford Smith

Tue 12/8

08:45-16:45

2 stops47h 00m

$2,020

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 46 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 13 June 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 13 June 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
8.7
Very Good
64 reviews
Check prices

Entertainment

7.3

Boarding

8.7

Comfort

8.1

Food

7.8

Overall

8.7

Crew

9.0

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
8.7
Very Good
64 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Entertainment

7.3

Boarding

8.7

Comfort

8.1

Food

7.8

Overall

8.7

Crew

9.0

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
1,091 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Entertainment

7.3

Boarding

8.7

Comfort

8.1

Food

7.8

Overall

8.7

Crew

9.0

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
1,490 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Entertainment

7.3

Boarding

8.7

Comfort

8.1

Food

7.8

Overall

8.7

Crew

9.0

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
882 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Entertainment

7.3

Boarding

8.7

Comfort

8.1

Food

7.8

Overall

8.7

Crew

9.0

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
194 reviews
Air Tahiti Nui
8.7
Very Good
64 reviews
Check prices

Entertainment

7.3

Boarding

8.7

Comfort

8.1

Food

7.8

Overall

8.7

Crew

9.0

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 $1,035 on Alaska Airlines. Other airlines that offer cheap prices include Fiji Airways from $1,059 and Qantas Airways from $1,193 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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Wollongong
Katoomba
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Bondi Beach
Leura
Swansea

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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 13 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,310Average$1,413FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,677Average$1,812FlexibilityNo 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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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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