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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $599

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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
1 Apr — 8 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 2 March 2026.

Mon 20/408:42
ORD
-
SYD
2 stops31h 38m
Air Canada
Sun 3/509:20
SYD
-
ORD
1 stop20h 25m
Air Canada
Deal found 1/3$1,550
Wed 25/318:49
ORD
-
SYD
2 stops44h 46m
Qantas Airways
Wed 29/409:10
SYD
-
ORD
1 stop20h 06m
Qantas Airways
Deal found 27/2$1,557
Tue 17/317:55
ORD
-
SYD
2 stops45h 40m
Qantas Airways
Thu 26/311:20
SYD
-
ORD
1 stop19h 33m
Qantas Airways
Deal found 1/3$1,559
Sun 19/405:15
ORD
-
SYD
2 stops39h 35m
Multiple Airlines
Sat 2/509:10
SYD
-
ORD
1 stop35h 25m
Multiple Airlines
Deal found 28/2$1,570
Wed 25/318:49
ORD
-
SYD
2 stops44h 46m
Qantas Airways
Mon 6/409:10
SYD
-
ORD
1 stop20h 43m
Qantas Airways
Deal found 27/2$1,573
Sun 26/414:00
ORD
-
SYD
2 stops30h 50m
Multiple Airlines
Sun 10/513:15
SYD
-
ORD
2 stops25h 12m
Multiple Airlines
Deal found 2/3$1,576
Sun 19/414:00
ORD
-
SYD
2 stops30h 50m
Multiple Airlines
Sun 3/509:10
SYD
-
ORD
1 stop29h 17m
Multiple Airlines
Deal found 27/2$1,592
Wed 15/407:51
ORD
-
SYD
2 stops36h 59m
Multiple Airlines
Wed 22/417:50
SYD
-
ORD
1 stop26h 45m
Multiple Airlines
Deal found 1/3$1,600
Sat 18/408:00
ORD
-
SYD
2 stops36h 50m
Multiple Airlines
Sat 2/517:50
SYD
-
ORD
1 stop26h 45m
Multiple Airlines
Deal found 1/3$1,605

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 2 March 2026.

Round-trip from

$1,550

One-way from

$599

Popular in

December

Cheapest in

March

Average price

$1,203
Air Canada
  • Air Canada
  • 20/4-3/5
  • 3 total stops
  • 52h 03m total
  • Chicago to Sydney
Search Deals
21/4
  • 21/4
  • 2 total stops
  • 28h 47m total
  • Chicago to Sydney
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($167 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($60 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 2 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

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 13/8

18:30-06:50

1 stop21h 20m

Sydney Kingsford Smith

Tue 1/9

09:15-14:00

1 stop19h 45m

$2,051

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 23/3

11:10-07:25

2 stops28h 15m

Sydney Kingsford Smith

Tue 31/3

10:15-21:34

2 stops27h 19m

$2,506

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 26/3

18:20-08:05

1 stop21h 45m

Sydney Kingsford Smith

Fri 3/4

10:30-00:59

2 stops30h 29m

$2,656

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 5/5

08:31-19:15

3 stops43h 44m

Sydney Kingsford Smith

Tue 19/5

15:00-17:49

3 stops41h 49m

$2,870

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 20/3

14:35-09:15

2 stops26h 40m

Sydney Kingsford Smith

Sun 29/3

11:20-00:59

2 stops29h 39m

$2,900

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 1/4

13:18-08:00

1 stop26h 42m

Sydney Kingsford Smith

Sat 4/4

10:30-05:15

1 stop34h 45m

$3,061

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 20/4

20:45-15:10

3 stops51h 25m

Sydney Kingsford Smith

Sun 3/5

08:55-07:18

3 stops37h 23m

$3,172

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 17/4

16:30-17:50

3 stops34h 20m

Sydney Kingsford Smith

Sat 25/4

17:50-07:18

3 stops52h 28m

$3,224

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Fri 14/8

18:45-17:50

3 stops32h 05m

Sydney Kingsford Smith

Sat 22/8

11:40-00:12

3 stops51h 32m

$3,764

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 18/3

18:20-06:35

2 stops44h 15m

Sydney Kingsford Smith

Tue 31/3

07:15-14:30

3 stops47h 15m

$3,770

Flights are sorted by cheapest return flights first.

Deals found on 27/2

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?

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 27 February 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 $278). Flying from Chicago O'Hare Intl Airport to Sydney in October is currently the most expensive (average of $1,224). 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 2 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
1,000 reviews
Check prices

Crew

8.1

Food

7.0

Boarding

7.7

Overall

7.5

Entertainment

7.2

Comfort

7.4

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
1,000 reviews
Qantas Airways
7.5
Good
1,000 reviews
Check prices

Crew

8.1

Food

7.0

Boarding

7.7

Overall

7.5

Entertainment

7.2

Comfort

7.4

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 $2,051, Delta can have you in Sydney from Chicago O'Hare Intl Airport in 21h 20m. 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 ($1,902), 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 $278). Flying from Chicago O'Hare Intl Airport to Sydney in October is currently the most expensive (average of $1,224). 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
Leura
Coogee
Cronulla
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 2 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$1,902Average$2,287FlexibilityNo 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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