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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $815

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 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Chicago O'Hare Intl to Sydney Kingsford Smith are usually found in March or May, booked 48 days in advance, depart on a Friday or Sunday and return on a Monday

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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 5 November 2025.

Tue 2/1208:20ORD - SYD
2 stops31h 40mMultiple Airlines
Tue 9/1211:20SYD - ORD
1 stop35h 45mMultiple Airlines
Deal found 3/11$1,579
Mon 8/1206:50ORD - SYD
1 stop33h 10mMultiple Airlines
Wed 17/1217:45SYD - ORD
2 stops37h 32mMultiple Airlines
Deal found 2/11$1,592
Mon 17/1109:32ORD - SYD
2 stops28h 53mMultiple Airlines
Sun 7/1217:45SYD - ORD
1 stop23h 28mMultiple Airlines
Deal found 1/11$1,612
Mon 29/1221:04ORD - SYD
1 stop42h 56mQantas Airways
Wed 28/107:05SYD - ORD
2 stops24h 52mQantas Airways
Deal found 4/11$1,631
Mon 10/1106:30ORD - SYD
1 stop31h 55mMultiple Airlines
Tue 25/1117:45SYD - ORD
1 stop24h 14mMultiple Airlines
Deal found 2/11$1,666
Mon 1/1215:40ORD - SYD
1 stop24h 55mAir Canada
Sun 18/108:00SYD - ORD
2 stops23h 41mAir Canada
Deal found 3/11$1,677
Sat 6/1215:40ORD - SYD
1 stop22h 15mMultiple Airlines
Sat 17/121:20SYD - ORD
2 stops34h 21mMultiple Airlines
Deal found 2/11$1,697

Cheap 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 5 November 2025.

Round-trip from

$1,579

One-way from

$815

Popular in

October

Cheapest in

March

Average price

$1,729
2/12-9/12
  • 2/12-9/12
  • 3 total stops
  • 67h 25m total
  • Chicago to Sydney
Search Deals
4/12
  • 4/12
  • 2 total stops
  • 44h 25m total
  • Chicago to Sydney
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($420 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($81 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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 5 November 2025.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Sydney that are best for you.

Fly from

O'Hare Intl

Fly to

Sydney

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 1/12

18:23-09:00

1 stop21h 37m

Sydney Kingsford Smith

Mon 8/12

11:20-16:58

1 stop22h 38m

$1,917

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 17/11

18:03-09:00

1 stop21h 57m

Sydney Kingsford Smith

Mon 8/12

11:20-16:58

1 stop22h 38m

$1,917

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/12

08:45-06:55

2 stops29h 10m

Sydney Kingsford Smith

Sat 13/12

11:20-14:41

1 stop20h 21m

$1,920

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 7/12

20:15-09:35

2 stops44h 20m

Sydney Kingsford Smith

Thu 11/12

16:00-14:41

1 stop39h 41m

$1,929

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 3/12

09:00-06:20

1 stop28h 20m

Sydney Kingsford Smith

Wed 10/12

11:20-14:25

1 stop20h 05m

$1,941

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/2

16:16-06:20

1 stop21h 04m

Sydney Kingsford Smith

Wed 11/2

12:10-14:53

1 stop19h 43m

$1,941

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/2

16:16-06:20

1 stop21h 04m

Sydney Kingsford Smith

Mon 16/2

11:50-14:43

1 stop19h 53m

$1,941

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 3/12

14:35-06:20

1 stop22h 45m

Sydney Kingsford Smith

Sun 14/12

14:00-17:00

1 stop20h 00m

$1,941

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 8/12

16:10-09:15

1 stop24h 05m

Sydney Kingsford Smith

Sun 14/12

12:10-17:00

1 stop21h 50m

$1,941

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 3/2

16:16-06:20

1 stop21h 04m

Sydney Kingsford Smith

Tue 10/2

14:00-16:57

1 stop19h 57m

$1,941

Flights are sorted by cheapest return flights first.

Deals found on 4/11

Showing 1-10 of 21 results
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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 31 October 2025.

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 $304). Flying from Chicago O'Hare Intl Airport to Sydney in January is currently the most expensive (average of $1,311). 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 ORD to SYD?

Find hourly flight availability from O'Hare Intl 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 5 November 2025.

It’s optimal to fly from Chicago O'Hare Intl Airport to Sydney in the afternoon. By choosing this option you can save up to 49% on the cost of your flight, compared to a flight at midday.

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 5 November 2025.
Get a feel of what it's like to fly with Qantas Airways and American Airlines 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
927 reviews
Check prices

Crew

8.2

Boarding

7.7

Entertainment

7.2

Overall

7.5

Food

7.0

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Qantas Airways
7.5
Good
927 reviews
Qantas Airways
7.5
Good
927 reviews
Check prices

Crew

8.2

Boarding

7.7

Entertainment

7.2

Overall

7.5

Food

7.0

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
American Airlines
7.2
Good
11,040 reviews
Qantas Airways
7.5
Good
927 reviews
Check prices

Crew

8.2

Boarding

7.7

Entertainment

7.2

Overall

7.5

Food

7.0

Comfort

7.5

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.

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. 2 airlines have 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 $1,917, Qantas Airways can have you in Sydney from Chicago O'Hare Intl Airport in 21h 37m. 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 are the cheapest airlines flying from Chicago O'Hare Intl Airport to Sydney round-trip?

    According to our current data, American Airlines ($1,317), and Qantas Airways ($1,343) offers the cheapest pricing from Chicago O'Hare Intl Airport to Sydney. Users have found that American Airlines is 19% cheaper than the other options available to this destination.

  • 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 $304). Flying from Chicago O'Hare Intl Airport to Sydney in January is currently the most expensive (average of $1,311). 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
Terrigal
Manly
Randwick
Lithgow
Coogee
Leura
Bondi Beach
Cronulla

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 2 airlines flying from O'Hare Intl to Sydney

Discover the top 2 airlines 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 5 November 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,317Average$1,331FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Qantas AirwaysCheapest$1,343Average$1,444FlexibilityNo 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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