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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $644

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 18/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SYD
31 Aug — 7 Sep1
1 adult

Cheapflights Tip: The best prices from Chicago O'Hare Intl to Sydney Kingsford Smith are usually found in March or May, booked 39 days in advance, depart on a Friday or Sunday and return on a Monday

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 26 August 2025.

Round-trip from

$1,547

One-way from

$644

Popular in

December

Cheapest in

March

Average price

$1,379
18/10-26/10
  • 18/10-26/10
  • 4 total stops
  • 71h 19m total
  • Chicago to Sydney
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18/11
  • 18/11
  • 2 total stops
  • 46h 40m total
  • Chicago to Sydney
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($351 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease ($66 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from O'Hare Intl to Sydney

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 26 August 2025.

Sat 18/1007:25ORD - SYD
2 stops37h 20mMultiple Airlines
Sun 26/1006:00SYD - ORD
2 stops33h 59mMultiple Airlines
Deal found 25/8$1,547
Sat 1/1106:30ORD - SYD
2 stops38h 00mMultiple Airlines
Sat 15/1114:30SYD - ORD
2 stops25h 30mMultiple Airlines
Deal found 23/8$1,590
Mon 27/1017:01ORD - SYD
3 stops27h 44mMultiple Airlines
Sun 9/1114:00SYD - ORD
3 stops33h 25mMultiple Airlines
Deal found 24/8$1,729
Mon 20/1007:25ORD - SYD
2 stops37h 20mMultiple Airlines
Sun 2/1114:00SYD - ORD
2 stops25h 57mMultiple Airlines
Deal found 24/8$1,778
Sat 1/1119:01ORD - SYD
2 stops25h 29mFiji Airways
Sat 15/1114:30SYD - ORD
2 stops22h 10mFiji Airways
Deal found 26/8$1,787
Mon 27/1017:35ORD - SYD
1 stop34h 40mANA
Sun 9/1121:45SYD - ORD
1 stop33h 05mANA
Deal found 24/8$1,789
Sat 1/1119:01ORD - SYD
2 stops25h 29mFiji Airways
Tue 11/1114:10SYD - ORD
2 stops24h 14mFiji Airways
Deal found 26/8$1,823
Tue 28/1019:01ORD - SYD
2 stops25h 44mMultiple Airlines
Tue 4/1114:10SYD - ORD
2 stops22h 30mMultiple Airlines
Deal found 26/8$1,824
Mon 27/1017:35ORD - SYD
1 stop34h 40mANA
Mon 10/1112:25SYD - ORD
1 stop35h 55mANA
Deal found 24/8$1,826
Mon 27/1017:35ORD - SYD
1 stop34h 40mANA
Tue 11/1112:25SYD - ORD
2 stops33h 51mANA
Deal found 24/8$1,841

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 26 August 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

Tue 10/2

16:45-12:30

2 stops26h 45m

Sydney Kingsford Smith

Fri 20/3

14:10-23:59

2 stops25h 49m

$1,747

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 4/2

16:25-20:15

1 stop34h 50m

Sydney Kingsford Smith

Tue 17/2

21:45-07:20

1 stop26h 35m

$1,772

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 1/11

19:01-12:30

2 stops25h 29m

Sydney Kingsford Smith

Sat 15/11

14:30-19:40

2 stops22h 10m

$1,787

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 1/11

19:01-12:30

2 stops25h 29m

Sydney Kingsford Smith

Tue 11/11

14:10-21:24

2 stops24h 14m

$1,823

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 28/10

19:01-12:45

2 stops25h 44m

Sydney Kingsford Smith

Tue 4/11

14:10-19:40

2 stops22h 30m

$1,824

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 4/2

17:40-21:50

2 stops35h 10m

Sydney Kingsford Smith

Tue 17/2

06:00-23:57

2 stops34h 57m

$1,860

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 9/2

17:40-12:30

2 stops25h 50m

Sydney Kingsford Smith

Thu 26/2

06:00-23:57

2 stops34h 57m

$1,860

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/2

17:40-21:50

2 stops35h 10m

Sydney Kingsford Smith

Tue 24/2

06:00-19:18

2 stops30h 18m

$1,860

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 5/2

17:40-12:30

2 stops25h 50m

Sydney Kingsford Smith

Sun 15/2

14:10-23:57

2 stops26h 47m

$1,860

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 4/2

16:25-20:15

1 stop34h 50m

Sydney Kingsford Smith

Mon 23/2

21:45-07:20

1 stop26h 35m

$1,870

Flights are sorted by cheapest return flights first.

Deals found on 23/8

Showing 1-10 of 16 results
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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 22 August 2025.

The best time to book flights from Chicago O'Hare Intl Airport to Sydney is 39 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, May is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Sydney (average of $129). Flying from Chicago O'Hare Intl Airport 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 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 26 August 2025.

It’s optimal to fly from Chicago O'Hare Intl Airport to Sydney in the morning. By choosing this option you can save up to 28% 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 26 August 2025.
Get a feel of what it's like to fly with Qantas Airways and Air Canada 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
904 reviews
Check prices

Food

6.9

Crew

8.2

Entertainment

7.2

Overall

7.5

Boarding

7.7

Comfort

7.5

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
904 reviews
Qantas Airways
7.5
Good
904 reviews
Check prices

Food

6.9

Crew

8.2

Entertainment

7.2

Overall

7.5

Boarding

7.7

Comfort

7.5

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.
Air Canada
7.1
Good
10,000 reviews
Qantas Airways
7.5
Good
904 reviews
Check prices

Food

6.9

Crew

8.2

Entertainment

7.2

Overall

7.5

Boarding

7.7

Comfort

7.5

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. 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 $1,747, Fiji Airways can have you in Sydney from Chicago O'Hare Intl Airport in 26h 45m. 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, Air Canada ($1,281), and Qantas Airways ($1,347) offers the cheapest pricing from Chicago O'Hare Intl Airport to Sydney. Users have found that Air Canada is 24% 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, May is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Sydney (average of $129). Flying from Chicago O'Hare Intl Airport 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 Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Penrith
Coogee
Terrigal
Cronulla
Manly
Lithgow
Randwick
Bondi Beach
Leura

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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 26 August 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,281Average$1,811FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,347Average$1,448FlexibilityNo 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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