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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $551

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to Sydney departing on 1/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Chicago O'Hare Intl Airport to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
3:10 pm - 9:00 am
ORD
-
SYD
24h 50m1 stop
Qantas Airways Logo
7:05 am - 4:38 pm
SYD
-
ORD
26h 33m2 stops
$886Qantas Airways
Wed, Feb 11 - Wed, Mar 4
Qantas Airways Logo
6:40 pm - 9:00 am
ORD
-
SYD
21h 20m1 stop
Qantas Airways Logo
7:05 am - 9:33 pm
SYD
-
ORD
31h 28m2 stops
$902Qantas Airways
Mon, Feb 2 - Mon, Feb 16
Qantas Airways Logo
3:10 pm - 7:25 am
ORD
-
SYD
23h 15m1 stop
Qantas Airways Logo
7:15 pm - 4:49 pm
SYD
-
ORD
38h 34m2 stops
$915Qantas Airways
Tue, Jan 27 - Tue, Feb 3
Air Canada Logo
3:35 pm - 9:35 am
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 am - 2:41 pm
SYD
-
ORD
20h 21m1 stop
$946Air Canada
Sun, Feb 1 - Sun, Feb 15
Air Canada Logo
3:35 pm - 9:35 am
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 am - 2:41 pm
SYD
-
ORD
20h 21m1 stop
$947Air Canada
Sun, Feb 1 - Sun, Feb 15
Air Canada Logo
3:35 pm - 9:35 am
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 am - 7:45 pm
SYD
-
ORD
25h 25m2 stops
$949Air Canada
Sun, Feb 1 - Sun, Feb 15
Air Canada Logo
3:35 pm - 9:35 am
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 am - 2:41 pm
SYD
-
ORD
20h 21m1 stop
$950Air Canada
Sun, Jan 25 - Sun, Feb 8
Qantas Airways Logo
3:10 pm - 9:00 am
ORD
-
SYD
24h 50m1 stop
Qantas Airways Logo
7:05 am - 4:38 pm
SYD
-
ORD
26h 33m2 stops
$951Qantas Airways
Sun, Feb 1 - Wed, Feb 18
Qantas Airways Logo
6:40 pm - 9:00 am
ORD
-
SYD
21h 20m1 stop
Qantas Airways Logo
7:05 am - 4:38 pm
SYD
-
ORD
26h 33m2 stops
$953Qantas Airways
Tue, Feb 10 - Tue, Mar 3
Air Canada Logo
3:35 pm - 9:35 am
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 am - 2:41 pm
SYD
-
ORD
20h 21m1 stop
$954Air Canada
Sun, Feb 1 - Wed, Feb 18

Qantas Airways flights from Chicago O'Hare Intl Airport to Sydney

Our best Qantas Airways deals on Chicago O'Hare Intl Airport to Sydney flight tickets
Qantas Airways
Feb 11
ORD3:10 pmChicago O'Hare Intl
24h 50m
1 stop
SYD9:00 amSydney Kingsford Smith
Mar 4
SYD7:05 amSydney Kingsford Smith
26h 33m
2 stops
ORD4:38 pmChicago O'Hare Intl
$886
Find similar
Qantas Airways
Feb 2
ORD6:40 pmChicago O'Hare Intl
21h 20m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 16
SYD7:05 amSydney Kingsford Smith
31h 28m
2 stops
ORD9:33 pmChicago O'Hare Intl
$902
Find similar
Qantas Airways
Jan 27
ORD3:10 pmChicago O'Hare Intl
23h 15m
1 stop
SYD7:25 amSydney Kingsford Smith
Feb 3
SYD7:15 pmSydney Kingsford Smith
38h 34m
2 stops
ORD4:49 pmChicago O'Hare Intl
$915
Find similar

Air Canada flights from Chicago O'Hare Intl Airport to Sydney

Our best Air Canada deals on Chicago O'Hare Intl Airport to Sydney flight tickets
Air Canada
Feb 1
ORD3:35 pmChicago O'Hare Intl
25h 00m
1 stop
SYD9:35 amSydney Kingsford Smith
Feb 15
SYD11:20 amSydney Kingsford Smith
20h 21m
1 stop
ORD2:41 pmChicago O'Hare Intl
$946
Find similar
Air Canada
Feb 1
ORD3:35 pmChicago O'Hare Intl
25h 00m
1 stop
SYD9:35 amSydney Kingsford Smith
Feb 15
SYD11:20 amSydney Kingsford Smith
20h 21m
1 stop
ORD2:41 pmChicago O'Hare Intl
$947
Find similar
Air Canada
Feb 1
ORD3:35 pmChicago O'Hare Intl
25h 00m
1 stop
SYD9:35 amSydney Kingsford Smith
Feb 15
SYD11:20 amSydney Kingsford Smith
25h 25m
2 stops
ORD7:45 pmChicago O'Hare Intl
$949
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Chicago O'Hare Intl Airport 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, momondo users made 832,500 searches. Data last updated December 14, 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

Fly to

Route

Depart

Return

Price

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 2/11

3:10 pm-9:00 am

1 stop24h 50m

Sydney Kingsford Smith

Wed 3/4

7:05 am-4:38 pm

2 stops26h 33m

$886

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 2/2

6:40 pm-9:00 am

1 stop21h 20m

Sydney Kingsford Smith

Mon 2/16

7:05 am-9:33 pm

2 stops31h 28m

$902

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 1/27

3:10 pm-7:25 am

1 stop23h 15m

Sydney Kingsford Smith

Tue 2/3

7:15 pm-4:49 pm

2 stops38h 34m

$915

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 2/1

3:35 pm-9:35 am

1 stop25h 00m

Sydney Kingsford Smith

Sun 2/15

11:20 am-2:41 pm

1 stop20h 21m

$946

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 2/1

3:35 pm-9:35 am

1 stop25h 00m

Sydney Kingsford Smith

Sun 2/15

11:20 am-2:41 pm

1 stop20h 21m

$947

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 2/1

3:35 pm-9:35 am

1 stop25h 00m

Sydney Kingsford Smith

Sun 2/15

11:20 am-7:45 pm

2 stops25h 25m

$949

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 1/25

3:35 pm-9:35 am

1 stop25h 00m

Sydney Kingsford Smith

Sun 2/8

11:20 am-2:41 pm

1 stop20h 21m

$950

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 2/1

3:10 pm-9:00 am

1 stop24h 50m

Sydney Kingsford Smith

Wed 2/18

7:05 am-4:38 pm

2 stops26h 33m

$951

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 2/10

6:40 pm-9:00 am

1 stop21h 20m

Sydney Kingsford Smith

Tue 3/3

7:05 am-4:38 pm

2 stops26h 33m

$953

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 2/1

3:35 pm-9:35 am

1 stop25h 00m

Sydney Kingsford Smith

Wed 2/18

11:20 am-2:41 pm

1 stop20h 21m

$954

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Sydney from

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Sydney?

In general, May is the cheapest month to fly from Chicago O'Hare Intl Airport to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $849. If you are unable to visit Sydney during the month of May, then departing from Chicago O'Hare Intl Airport during the month March is also very affordable. Most momondo users find prices during this month for around $851.

What is the cheapest day to depart on your flight to Sydney?

The cheapest day to depart from Chicago O'Hare Intl Airport to Sydney is on a Saturday when prices can be found for as low as $1,166. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,391.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the morning. momondo users have found flights departing from Chicago O'Hare Intl Airport to Sydney in the morning for as low as $1,224. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the evening, with an average ticket price of $1,412. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,073 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Chicago O'Hare Intl Airport for as low as $851 on momondo.

Can stopping save me money on Chicago O'Hare Intl Airport to Sydney flights?

You could potentially save up to 14% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Sydney flight.

How have Chicago O'Hare Intl Airport to Sydney flight prices changed over time?

As of December 2025, prices for Chicago O'Hare Intl Airport to Sydney flights are approximately 52% cheaper when compared to flights at the same time last year.

When to book flights from Chicago O'Hare Intl Airport to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago O'Hare Intl Airport to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Chicago O'Hare Intl Airport to Sydney (ORD to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Sydney

Fastest flight time

20h 36m

Direct flights

None
The fastest flight from Chicago O'Hare Intl Airport to Sydney takes 20h 36m
There are no direct flights from Chicago O'Hare Intl Airport to Sydney. There are no popular flight routes from Chicago O'Hare Intl Airport to Sydney.
Search flight deals

  • How far is Chicago O'Hare Intl to Sydney Kingsford Smith by plane?

    Sydney Kingsford Smith is 9224.8 mi away from Chicago O'Hare Intl. 20h 36m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago O'Hare Intl Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The travel and health documents required for your trip to Sydney Kingsford Smith Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sydney Kingsford Smith Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Chicago O'Hare Intl Airport to Sydney?

Best airlines flying from Chicago O'Hare Intl Airport to Sydney

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Sydney with momondo
Airline
Rating
Free Cancellation
Price
ANAPriceFrom $679Free CancellationRating
8.4
1,023 reviews
Search ANA flights
Qantas AirwaysPriceFrom $810Free CancellationRating
7.5
946 reviews
Search Qantas Airways flights
American AirlinesPriceFrom $814Free CancellationRating
7.2
11,052 reviews
Search American Airlines flights
Fiji AirwaysPriceFrom $849Free CancellationRating
8.1
210 reviews
Search Fiji Airways flights
Air CanadaPriceFrom $851Free CancellationRating
7.1
10,525 reviews
Search Air Canada flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
DeltaPriceFrom $935Free CancellationRating
7.9
8,007 reviews
Search Delta flights
Air New ZealandPriceFrom $1,282Free CancellationRating
8.0
552 reviews
Search Air New Zealand flights

Traveling to a place near Sydney?

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

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Sydney?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Chicago to Sydney. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Chicago to Sydney with flexible booking policies on momondo?

All flight searches from Chicago to Sydney on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Chicago to Sydney?

Once all potential Chicago to Sydney flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Chicago to Sydney right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Chicago to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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