Cheap flights from Illinois to Sydney from $674

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 30/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
23 Jul — 30 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 18 July 2025.

Round-trip from

$1,552

One-way from

$674

Popular in

December

Cheapest in

August

Average price

$1,626
United Airlines
  • United Airlines
  • 1/9-8/9
  • 4 total stops
  • 57h 36m total
  • Illinois to Sydney
30/8
  • 30/8
  • 2 total stops
  • 33h 33m total
  • Illinois to Sydney
Highest demand for flights based on searches. 15% potential increase in price ($433 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease ($98 potential savings vs. average return price).
Average for round-trip flights in July 2025

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 18 July 2025.

Mon 1/907:19ORD - SYD
2 stops32h 36mUnited Airlines
Mon 8/910:20SYD - ORD
2 stops25h 00mUnited Airlines
Deal found 18/7$1,552
Mon 27/1006:15MDW - SYD
2 stops33h 10mMultiple Airlines
Sun 9/1114:20SYD - MDW
2 stops26h 05mMultiple Airlines
Deal found 17/7$1,641
Sat 30/814:07ORD - SYD
2 stops33h 33mMultiple Airlines
Sat 6/917:45SYD - ORD
1 stop33h 04mMultiple Airlines
Deal found 15/7$1,658
Wed 5/1106:15STL - SYD
2 stops47h 10mQantas Airways
Sun 23/1114:20SYD - STL
1 stop20h 57mQantas Airways
Deal found 18/7$1,664
Sun 31/813:30STL - SYD
2 stops26h 50mAir Canada
Sun 7/909:20SYD - STL
2 stops49h 37mAir Canada
Deal found 17/7$1,681
Wed 29/1016:55STL - SYD
2 stops23h 40mMultiple Airlines
Sat 15/1111:20SYD - STL
2 stops45h 09mMultiple Airlines
Deal found 17/7$1,743
Thu 18/915:55PIA - SYD
2 stops24h 05mUnited Airlines
Mon 22/909:30SYD - PIA
2 stops44h 48mUnited Airlines
Deal found 18/7$1,745
Mon 24/1116:25ORD - SYD
1 stop34h 50mANA
Sun 7/1221:45SYD - ORD
1 stop26h 35mANA
Deal found 18/7$1,796
Mon 1/919:41STL - SYD
1 stop20h 14mAmerican Airlines
Mon 8/909:10SYD - STL
1 stop28h 49mAmerican Airlines
Deal found 17/7$1,797
Mon 1/917:49STL - SYD
1 stop22h 06mUnited Airlines
Mon 8/910:20SYD - STL
1 stop21h 33mUnited Airlines
Deal found 18/7$1,822
Sat 6/918:30ORD - SYD
2 stops26h 15mFiji Airways
Tue 16/906:00SYD - ORD
2 stops30h 24mFiji Airways
Deal found 16/7$1,891
Mon 25/811:54EVV - SYD
2 stops28h 01mAmerican Airlines
Tue 2/912:10SYD - EVV
2 stops25h 39mAmerican Airlines
Deal found 17/7$2,082

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 18 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

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 1/9

07:19-06:55

2 stops32h 36m

Sydney Kingsford Smith

Mon 8/9

10:20-20:20

2 stops25h 00m

$1,552

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Mon 27/10

06:15-07:25

2 stops33h 10m

Sydney Kingsford Smith

Sun 9/11

14:20-23:25

2 stops26h 05m

$1,641

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 30/8

14:07-14:40

2 stops33h 33m

Sydney Kingsford Smith

Sat 6/9

17:45-11:49

1 stop33h 04m

$1,658

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

06:15-22:25

2 stops47h 10m

Sydney Kingsford Smith

Sun 23/11

14:20-18:17

1 stop20h 57m

$1,664

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 31/8

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Sun 7/9

09:20-19:57

2 stops49h 37m

$1,681

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

16:55-08:35

2 stops23h 40m

Sydney Kingsford Smith

Sat 15/11

11:20-15:29

2 stops45h 09m

$1,743

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Thu 18/9

15:55-07:00

2 stops24h 05m

Sydney Kingsford Smith

Mon 22/9

09:30-15:18

2 stops44h 48m

$1,745

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 24/11

16:25-20:15

1 stop34h 50m

Sydney Kingsford Smith

Sun 7/12

21:45-07:20

1 stop26h 35m

$1,796

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/9

19:41-06:55

1 stop20h 14m

Sydney Kingsford Smith

Mon 8/9

09:10-22:59

1 stop28h 49m

$1,797

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/9

17:49-06:55

1 stop22h 06m

Sydney Kingsford Smith

Mon 8/9

10:20-16:53

1 stop21h 33m

$1,822

Flights are sorted by cheapest return flights first.

Deals found on 17/7

Showing 1-10 of 28 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 18 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 18 July 2025.
Get a feel of what it's like to fly with ANA, Fiji Airways, andDelta 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.

Overall

8.4

Food

7.7

Boarding

8.5

Comfort

8.2

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA
8.4
Very Good

Overall

8.4

Food

7.7

Boarding

8.5

Comfort

8.2

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

Overall

8.4

Food

7.7

Boarding

8.5

Comfort

8.2

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA
8.0
Very Good

Overall

8.4

Food

7.7

Boarding

8.5

Comfort

8.2

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

Overall

8.4

Food

7.7

Boarding

8.5

Comfort

8.2

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

Overall

8.4

Food

7.7

Boarding

8.5

Comfort

8.2

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MNL - NRT

Flight delayed from 7pm to 2am, united airlines sold our tickets so they had to book us with AA

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 $1,007 on United Airlines. Other airlines that offer cheap prices include ANA from $1,055 and Fiji Airways from $1,074 one-way.

  • What are the most popular routes 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 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 Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Manly
Coogee
Cronulla
Terrigal
Lithgow
Randwick
Bondi Beach
Leura

Browse thousands of different options on Cheapflights for your next trip

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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 18 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,317Average$1,420FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,685Average$1,818FlexibilityNo 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?

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