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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $675

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 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
21 Apr — 28 Apr1
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 22 March 2026.

Sat 2/515:00
ORD
-
SYD
2 stops29h 50m
Multiple Airlines
Sat 9/513:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Deal found 18/3$1,278
Sun 3/505:15
ORD
-
SYD
2 stops39h 35m
Multiple Airlines
Sun 10/513:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Deal found 20/3$1,294
Wed 22/407:30
ORD
-
SYD
2 stops37h 20m
Multiple Airlines
Wed 29/406:00
SYD
-
ORD
2 stops32h 27m
Multiple Airlines
Deal found 16/3$1,314
Sun 3/505:15
ORD
-
SYD
2 stops39h 35m
Multiple Airlines
Tue 12/506:00
SYD
-
ORD
2 stops31h 04m
Multiple Airlines
Deal found 16/3$1,341
Sat 16/515:00
ORD
-
SYD
2 stops29h 50m
Multiple Airlines
Sun 24/513:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Deal found 18/3$1,344
Mon 4/514:39
ORD
-
SYD
2 stops30h 26m
Multiple Airlines
Mon 11/513:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Deal found 20/3$1,357
Sun 10/505:15
ORD
-
SYD
2 stops39h 35m
Multiple Airlines
Sun 17/506:00
SYD
-
ORD
2 stops38h 35m
Multiple Airlines
Deal found 17/3$1,384
Sun 3/514:00
ORD
-
SYD
2 stops30h 50m
Multiple Airlines
Mon 11/513:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Deal found 16/3$1,441
Sat 2/508:00
ORD
-
SYD
2 stops36h 50m
Multiple Airlines
Sun 10/513:15
SYD
-
ORD
2 stops31h 20m
Multiple Airlines
Deal found 20/3$1,480

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 22 March 2026.

Round-trip from

$1,278

One-way from

$675

Popular in

December

Cheapest in

August

Average price

$1,721
2/5-9/5
  • 2/5-9/5
  • 4 total stops
  • 61h 10m total
  • Chicago to Sydney
Search Deals
1/5
  • 1/5
  • 2 total stops
  • 57h 26m total
  • Chicago to Sydney
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($58 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($54 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 22 March 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

Tue 5/5

11:05-07:20

3 stops29h 15m

Sydney Kingsford Smith

Tue 12/5

09:20-20:08

2 stops25h 48m

$1,601

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 29/6

11:05-07:20

3 stops29h 15m

Sydney Kingsford Smith

Mon 13/7

09:20-18:18

2 stops23h 58m

$1,997
Fastest return journey

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 31/7

18:10-07:00

1 stop21h 50m

Sydney Kingsford Smith

Mon 10/8

10:20-16:38

1 stop21h 18m

$2,145

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 6/6

16:45-07:00

1 stop23h 15m

Sydney Kingsford Smith

Sun 6/9

10:20-16:42

1 stop21h 22m

$2,145

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 30/7

15:47-07:00

1 stop24h 13m

Sydney Kingsford Smith

Tue 11/8

10:20-14:50

1 stop19h 30m

$2,145

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 6/6

16:44-06:55

1 stop23h 11m

Sydney Kingsford Smith

Mon 31/8

09:10-17:43

1 stop23h 33m

$2,212

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 6/6

17:00-06:50

2 stops22h 50m

Sydney Kingsford Smith

Sat 5/9

09:15-20:24

2 stops26h 09m

$2,366

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 5/5

16:20-06:30

3 stops47h 10m

Sydney Kingsford Smith

Tue 12/5

10:10-14:30

3 stops43h 20m

$3,599

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 22/8

09:33-19:15

3 stops42h 42m

Sydney Kingsford Smith

Mon 31/8

15:00-17:41

3 stops41h 41m

$3,759

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 7/5

16:20-07:10

3 stops47h 50m

Sydney Kingsford Smith

Wed 20/5

10:10-14:15

3 stops43h 05m

$3,835

Flights are sorted by cheapest return flights first.

Deals found on 17/3

Showing 1-10 of 17 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?

Use this chart to determine the optimal time to book a return flight from O'Hare Intl to Sydney. Price data was last updated on 13 March 2026.

The best time to book flights from Chicago O'Hare Intl Airport to Sydney is 48 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, August is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Sydney (average of $282). Flying from Chicago O'Hare Intl Airport to Sydney in October is currently the most expensive (average of $1,278). 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.

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 22 March 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
1,006 reviews
Check prices

Entertainment

7.2

Boarding

7.7

Overall

7.5

Food

7.0

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Qantas Airways
7.5
Good
1,006 reviews
Qantas Airways
7.5
Good
1,006 reviews
Check prices

Entertainment

7.2

Boarding

7.7

Overall

7.5

Food

7.0

Comfort

7.4

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.

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 $2,145, Air Canada can have you in Sydney from Chicago O'Hare Intl Airport in 21h 50m. 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 ($1,926), 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, August is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Sydney (average of $282). Flying from Chicago O'Hare Intl Airport to Sydney in October is currently the most expensive (average of $1,278). 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
Terrigal
Lithgow
Bondi Beach
Coogee
Cronulla
Leura
Randwick

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 22 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,926Average$2,316FlexibilityNo 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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