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Cheap flights from Illinois to Sydney from $702

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
13 Jul — 20 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 8 July 2025.

Round-trip from

$1,335

One-way from

$702

Popular in

December

Cheapest in

August

Average price

$1,757
American Airlines
  • American Airlines
  • 18/8-25/8
  • 3 total stops
  • 47h 48m total
  • Illinois to Sydney
Search Deals
4/9
  • 4/9
  • 2 total stops
  • 32h 20m total
  • Illinois to Sydney
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($436 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($103 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 8 July 2025.

Mon 18/814:55ORD - SYD
2 stops25h 10mAmerican Airlines
Mon 25/809:10SYD - ORD
1 stop22h 38mAmerican Airlines
Deal found 7/7$1,335
Sun 10/806:40ORD - SYD
2 stops38h 05mMultiple Airlines
Mon 25/813:15SYD - ORD
2 stops31h 25mMultiple Airlines
Deal found 7/7$1,632
Thu 21/815:55PIA - SYD
2 stops24h 05mUnited Airlines
Mon 25/810:20SYD - PIA
2 stops25h 32mUnited Airlines
Deal found 6/7$1,715
Fri 28/1106:15STL - SYD
2 stops34h 05mQantas Airways
Sun 14/1214:20SYD - STL
1 stop18h 47mQantas Airways
Deal found 7/7$1,735
Thu 21/813:30STL - SYD
2 stops26h 50mAir Canada
Sat 6/909:20SYD - STL
2 stops25h 37mAir Canada
Deal found 6/7$1,746
Sun 14/913:30STL - SYD
2 stops26h 50mMultiple Airlines
Sat 27/909:20SYD - STL
2 stops22h 12mMultiple Airlines
Deal found 7/7$1,761
Thu 21/809:23STL - SYD
1 stop30h 32mAmerican Airlines
Sat 6/909:10SYD - STL
2 stops26h 05mAmerican Airlines
Deal found 6/7$1,798
Sun 3/817:51STL - SYD
1 stop22h 04mUnited Airlines
Sun 10/810:20SYD - STL
1 stop21h 25mUnited Airlines
Deal found 6/7$2,041
Wed 10/913:43MDW - SYD
2 stops25h 52mDelta
Wed 24/909:25SYD - MDW
2 stops23h 10mDelta
Deal found 8/7$2,253
Mon 25/813:37EVV - SYD
2 stops26h 28mAmerican Airlines
Tue 2/912:10SYD - EVV
2 stops25h 39mAmerican Airlines
Deal found 8/7$2,351
Mon 25/813:05EVV - SYD
2 stops26h 30mDelta
Tue 2/909:25SYD - EVV
2 stops39h 08mDelta
Deal found 7/7$2,983
Tue 30/1206:00MDW - SYD
2 stops31h 55mKorean Air
Tue 3/209:10SYD - MDW
2 stops29h 36mKorean Air
Deal found 7/7$4,354

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 8 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 18/8

14:55-07:05

2 stops25h 10m

Sydney Kingsford Smith

Mon 25/8

09:10-16:48

1 stop22h 38m

$1,335

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 10/8

06:40-11:45

2 stops38h 05m

Sydney Kingsford Smith

Mon 25/8

13:15-05:40

2 stops31h 25m

$1,632

PeoriaSydney

PIA - SYD

PIASYD

Greater Peoria

Thu 21/8

15:55-07:00

2 stops24h 05m

Sydney Kingsford Smith

Mon 25/8

10:20-20:52

2 stops25h 32m

$1,715

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

06:15-09:20

2 stops34h 05m

Sydney Kingsford Smith

Sun 14/12

14:20-16:07

1 stop18h 47m

$1,735

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 21/8

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Sat 6/9

09:20-19:57

2 stops25h 37m

$1,746

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/9

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Sat 27/9

09:20-16:32

2 stops22h 12m

$1,761

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 21/8

09:23-06:55

1 stop30h 32m

Sydney Kingsford Smith

Sat 6/9

09:10-20:15

2 stops26h 05m

$1,798

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 3/8

17:51-06:55

1 stop22h 04m

Sydney Kingsford Smith

Sun 10/8

10:20-16:45

1 stop21h 25m

$2,041

ChicagoSydney

MDW - SYD

MDWSYD

Chicago Midway

Wed 10/9

13:43-06:35

2 stops25h 52m

Sydney Kingsford Smith

Tue 23/9

09:25-17:35

2 stops23h 10m

$2,253

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 23/8

07:00-06:35

2 stops32h 35m

Sydney Kingsford Smith

Mon 1/9

09:25-00:38

2 stops30h 13m

$2,265

Flights are sorted by cheapest return flights first.

Deals found on 7/7

Showing 1-10 of 29 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 8 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 8 July 2025.
Get a feel of what it's like to fly with Korean Air, ANA, andFiji Airways 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.
Korean Air
8.4
Very Good
1,104 reviews
Check prices

Crew

8.7

Comfort

8.3

Food

8.1

Entertainment

8.2

Overall

8.4

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very Good
1,104 reviews
Korean Air
8.4
Very Good
1,104 reviews
Check prices

Crew

8.7

Comfort

8.3

Food

8.1

Entertainment

8.2

Overall

8.4

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
ANA
8.4
Very Good
896 reviews
Korean Air
8.4
Very Good
1,104 reviews
Check prices

Crew

8.7

Comfort

8.3

Food

8.1

Entertainment

8.2

Overall

8.4

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Fiji Airways
8.0
Very Good
201 reviews
Korean Air
8.4
Very Good
1,104 reviews
Check prices

Crew

8.7

Comfort

8.3

Food

8.1

Entertainment

8.2

Overall

8.4

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Delta
8.0
Very Good
7,963 reviews
Korean Air
8.4
Very Good
1,104 reviews
Check prices

Crew

8.7

Comfort

8.3

Food

8.1

Entertainment

8.2

Overall

8.4

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Qantas Airways
7.5
Good
873 reviews
Korean Air
8.4
Very Good
1,104 reviews
Check prices

Crew

8.7

Comfort

8.3

Food

8.1

Entertainment

8.2

Overall

8.4

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

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 $951 on American Airlines. Other airlines that offer cheap prices include Fiji Airways from $997 and Air Canada from $1,130 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
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Terrigal
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Randwick
Bondi Beach
Leura

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Alternative routes for Illinois to Sydney

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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 8 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,312Average$1,414FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Air CanadaCheapest$1,678Average$1,811FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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