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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $857

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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
30 Aug — 6 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from O'Hare Intl to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from O'Hare Intl to Sydney
Explore the most affordable flight options available from O'Hare Intl to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 July 2026.

Sun 30/820:25
ORD
-
SYD
1 stop42h 45m
Multiple Airlines
Mon 14/907:40
SYD
-
ORD
1 stop45h 40m
Multiple Airlines
Deal found 31/7$1,741
Tue 11/821:13
ORD
-
SYD
1 stop43h 17m
Multiple Airlines
Tue 25/813:15
SYD
-
ORD
2 stops32h 02m
Multiple Airlines
Deal found 27/7$1,747
Sun 6/921:06
ORD
-
SYD
1 stop42h 59m
Qantas Airways
Sun 20/917:50
SYD
-
ORD
1 stop37h 03m
Qantas Airways
Deal found 27/7$1,750
Wed 29/716:45
ORD
-
SYD
2 stops23h 10m
United Airlines
Fri 7/810:20
SYD
-
ORD
2 stops21h 45m
United Airlines
Deal found 26/7$1,751
Sun 18/1013:55
ORD
-
SYD
2 stops25h 55m
Delta
Sat 24/1010:15
SYD
-
ORD
2 stops27h 21m
Delta
Deal found 26/7$1,752
Thu 27/814:00
ORD
-
SYD
1 stop49h 10m
Multiple Airlines
Wed 9/907:40
SYD
-
ORD
1 stop45h 40m
Multiple Airlines
Deal found 30/7$1,758
Tue 1/909:20
ORD
-
SYD
2 stops30h 45m
Multiple Airlines
Tue 8/909:10
SYD
-
ORD
1 stop36h 07m
Multiple Airlines
Deal found 30/7$1,762
Sun 23/809:00
ORD
-
SYD
1 stop31h 05m
Multiple Airlines
Sun 6/906:00
SYD
-
ORD
2 stops24h 54m
Multiple Airlines
Deal found 26/7$1,768
Mon 24/815:22
ORD
-
SYD
1 stop25h 08m
Qantas Airways
Mon 31/806:00
SYD
-
ORD
2 stops24h 54m
Qantas Airways
Deal found 26/7$1,781
Wed 9/906:30
ORD
-
SYD
2 stops33h 35m
Multiple Airlines
Wed 16/917:50
SYD
-
ORD
2 stops30h 30m
Multiple Airlines
Deal found 30/7$1,785

Find flight deals from O'Hare Intl to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from O'Hare Intl (ORD) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 31 July 2026.

Round-trip from

$1,741

One-way from

$857

Popular in

July

Cheapest in

November

Average price

$2,565
Cathay Pacific
  • Cathay Pacific
  • 30/8-14/9
  • 2 total stops
  • 88h 25m total
  • Chicago to Sydney
Search Deals
2/11
  • 2/11
  • 3 total stops
  • 52h 35m total
  • Chicago to Sydney
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($126 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($69 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from O'Hare Intl 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 31 July 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 1/1

21:20-09:05

1 stop42h 45m

Sydney Kingsford Smith

Fri 5/2

11:20-14:37

1 stop20h 17m

$2,049

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 28/10

21:15-19:35

2 stops54h 20m

Sydney Kingsford Smith

Sun 1/11

21:30-19:20

2 stops38h 50m

$2,219
Fastest return journey

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 29/12

13:35-08:30

2 stops25h 55m

Sydney Kingsford Smith

Wed 3/2

10:40-17:57

2 stops24h 17m

$2,290

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 25/12

21:20-09:05

1 stop42h 45m

Sydney Kingsford Smith

Thu 7/1

11:50-20:22

1 stop25h 32m

$2,290

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 25/8

18:54-18:50

2 stops32h 56m

Sydney Kingsford Smith

Fri 4/9

20:45-06:20

3 stops24h 35m

$2,373

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 29/12

15:57-09:20

1 stop24h 23m

Sydney Kingsford Smith

Sun 10/1

11:20-23:19

2 stops28h 59m

$2,412

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 11/12

06:00-06:20

1 stop31h 20m

Sydney Kingsford Smith

Tue 5/1

13:20-23:02

2 stops26h 42m

$2,519

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 5/11

07:00-06:25

3 stops30h 25m

Sydney Kingsford Smith

Wed 18/11

21:25-05:40

3 stops25h 15m

$2,535

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 6/1

14:55-08:30

1 stop24h 35m

Sydney Kingsford Smith

Thu 21/1

10:40-21:53

2 stops28h 13m

$2,662

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 15/9

08:00-07:30

2 stops32h 30m

Sydney Kingsford Smith

Wed 23/9

17:50-06:20

3 stops27h 30m

$3,190

Flights are sorted by cheapest return flights first.

Deals found on 26/7

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

Best time to book a flight from O'Hare Intl to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from O'Hare Intl 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 Chicago O'Hare Intl Airport to Sydney

How far ahead should I book a flight from Chicago O'Hare Intl Airport to Sydney?

The best time to book flights from Chicago O'Hare Intl Airport to Sydney is 55 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Sydney?

Currently, November is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Sydney (average of $1,701). Flying from Chicago O'Hare Intl Airport to Sydney in July is currently the most expensive (average of $2,565). 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.

How much does it cost for a return flight from Chicago O'Hare Intl Airport to Sydney?

Airfare is below average for this route at the moment.

Chicago O'Hare Intl Airport to Sydney flights typically cost between $1,801 and $2,275 in August.
The cheapest return price found within the last 5 days was $1,741 on Multiple Airlines (30 Aug–14 Sept).

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 31 July 2026.
Get a feel of what it's like to fly with Qantas Airways from Chicago O'Hare Intl Airport to Sydney by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
1,073 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

7.0

Entertainment

7.2

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
Qantas Airways
7.5
Good
1,073 reviews
Qantas Airways
7.5
Good
1,073 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

7.0

Entertainment

7.2

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl 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 Chicago O'Hare Intl?

    For a flight from Chicago O'Hare Intl to Sydney, you will be flying into Kingsford Smith. Sydney Kingsford Smith (SYD) is just 7.5 km from the centre vof the city. Kingsford Smith is the only Sydney airport and it handles 0 inbound flights from Chicago O'Hare Intl per day. 1 airline has flights to Sydney Kingsford Smith from Chicago O'Hare Intl on a regular basis.

  • How long is the flight from Chicago O'Hare Intl Airport to Sydney?

    For as low as $2,290, United Airlines can have you in Sydney from Chicago O'Hare Intl Airport in 25h 55m. The distance between Chicago O'Hare Intl Airport and Sydney is about 14851 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What is the cheapest airline to fly from Chicago O'Hare Intl Airport to Sydney round-trip?

    According to our current data, Qantas Airways ($2,103), offers the cheapest pricing from Chicago O'Hare Intl Airport to Sydney.

  • Can I find deals for flights from O'Hare Intl to Sydney that include hotel bookings?

    Yes. In addition to deals on O'Hare Intl to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from O'Hare Intl to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to Sydney.

  • Can I find deals for business class flights from O'Hare Intl to Sydney?

    Yes. Cheapflights offers flight deals from O'Hare Intl 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 Chicago O'Hare Intl Airport to Sydney?

    Currently, November is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Sydney (average of $1,701). Flying from Chicago O'Hare Intl Airport to Sydney in July is currently the most expensive (average of $2,565). 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
Penrith
Katoomba
Manly
Lithgow
Cronulla
Randwick
Terrigal
Leura
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for O'Hare Intl to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Midway to Sydney flights

Top airline flying from O'Hare Intl to Sydney

Discover the top airline that operate flights from O'Hare Intl 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 31 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$2,103Average$2,328FlexibilityNo cancel feeOn-time74%
Search Qantas Airways 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 O'Hare Intl to Sydney?

Cheapflights helps you search for flights from O'Hare Intl to Sydney via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from O'Hare Intl to Sydney?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from O'Hare Intl to Sydney for you. Better yet — we are completely free to use.

Can Cheapflights find flights from O'Hare Intl to Sydney with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from O'Hare Intl to Sydney, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from O'Hare Intl to Sydney become cheaper?

Of course! You can now track prices for flights from O'Hare Intl 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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