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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $739

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 10/2. 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 return flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
19:29 - 07:35
ORD
-
SYD
43h 06m
2 stops
Qantas Airways Logo
09:10 - 17:46
SYD
-
ORD
23h 36m
1 stop
$1,437Qantas Airways
Tue, 24 Feb - Mon, 6 Apr
Qantas Airways Logo
19:29 - 07:35
ORD
-
SYD
43h 06m
2 stops
Qantas Airways Logo
18:50 - 23:47
SYD
-
ORD
20h 57m
1 stop
$1,447Qantas Airways
Tue, 17 Feb - Tue, 31 Mar
Qantas Airways Logo
18:00 - 20:50
ORD
-
SYD
33h 50m
2 stops
Qantas Airways Logo
11:20 - 21:35
SYD
-
ORD
27h 15m
1 stop
$1,452Qantas Airways
Sun, 1 Feb - Wed, 25 Feb
Qantas Airways Logo
08:50 - 20:50
ORD
-
SYD
43h 00m
2 stops
Qantas Airways Logo
11:20 - 17:46
SYD
-
ORD
23h 26m
1 stop
$1,471Qantas Airways
Sun, 8 Feb - Mon, 23 Feb
Qantas Airways Logo
17:55 - 07:35
ORD
-
SYD
45h 40m
2 stops
Qantas Airways Logo
21:25 - 17:05
SYD
-
ORD
35h 40m
1 stop
$1,482Qantas Airways
Tue, 10 Mar - Tue, 24 Mar
Qantas Airways Logo
13:24 - 10:05
ORD
-
SYD
51h 41m
2 stops
Qantas Airways Logo
11:20 - 14:53
SYD
-
ORD
20h 33m
1 stop
$1,488Qantas Airways
Mon, 23 Feb - Tue, 3 Mar
Multiple Airlines Logo
19:39 - 07:25
ORD
-
SYD
43h 46m
1 stop
Multiple Airlines Logo
14:00 - 04:49
SYD
-
ORD
30h 49m
2 stops
$1,492Multiple Airlines
Tue, 10 Mar - Tue, 24 Mar
Multiple Airlines Logo
19:39 - 07:25
ORD
-
SYD
43h 46m
1 stop
Multiple Airlines Logo
14:00 - 04:49
SYD
-
ORD
30h 49m
2 stops
$1,503Multiple Airlines
Tue, 10 Mar - Tue, 24 Mar
Qantas Airways Logo
08:50 - 20:50
ORD
-
SYD
43h 00m
2 stops
Qantas Airways Logo
11:20 - 14:53
SYD
-
ORD
20h 33m
1 stop
$1,506Qantas Airways
Sun, 8 Feb - Tue, 24 Feb
Multiple Airlines Logo
19:39 - 07:25
ORD
-
SYD
43h 46m
1 stop
Multiple Airlines Logo
14:00 - 04:49
SYD
-
ORD
30h 49m
2 stops
$1,525Multiple Airlines
Tue, 10 Mar - Fri, 20 Mar

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
24 Feb
ORD19:29Chicago O'Hare Intl
43h 06m
2 stops
SYD07:35Sydney Kingsford Smith
6 Apr
SYD09:10Sydney Kingsford Smith
23h 36m
1 stop
ORD17:46Chicago O'Hare Intl
$1,437
Qantas Airways
17 Feb
ORD19:29Chicago O'Hare Intl
43h 06m
2 stops
SYD07:35Sydney Kingsford Smith
31 Mar
SYD18:50Sydney Kingsford Smith
20h 57m
1 stop
ORD23:47Chicago O'Hare Intl
$1,447
Qantas Airways
1 Feb
ORD18:00Chicago O'Hare Intl
33h 50m
2 stops
SYD20:50Sydney Kingsford Smith
25 Feb
SYD11:20Sydney Kingsford Smith
27h 15m
1 stop
ORD21:35Chicago O'Hare Intl
$1,452

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
9 Mar
ORD15:35Chicago O'Hare Intl
25h 00m
1 stop
SYD08:35Sydney Kingsford Smith
23 Mar
SYD10:25Sydney Kingsford Smith
20h 16m
1 stop
ORD14:41Chicago O'Hare Intl
$1,570
Air Canada
9 Mar
ORD12:50Chicago O'Hare Intl
27h 45m
2 stops
SYD08:35Sydney Kingsford Smith
23 Mar
SYD10:25Sydney Kingsford Smith
20h 16m
1 stop
ORD14:41Chicago O'Hare Intl
$1,575
Air Canada
9 Mar
ORD15:35Chicago O'Hare Intl
25h 00m
1 stop
SYD08:35Sydney Kingsford Smith
23 Mar
SYD10:25Sydney Kingsford Smith
20h 16m
1 stop
ORD14:41Chicago O'Hare Intl
$1,642

momondo Fare Finder

 
Customise 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 78,305 searches. Data last updated 19 January 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

Tue 24/2

19:29-07:35

2 stops43h 06m

Sydney Kingsford Smith

Mon 6/4

09:10-17:46

1 stop23h 36m

$1,437

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 17/2

19:29-07:35

2 stops43h 06m

Sydney Kingsford Smith

Tue 31/3

18:50-23:47

1 stop20h 57m

$1,447

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 1/2

18:00-20:50

2 stops33h 50m

Sydney Kingsford Smith

Wed 25/2

11:20-21:35

1 stop27h 15m

$1,452

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/2

08:50-20:50

2 stops43h 00m

Sydney Kingsford Smith

Mon 23/2

11:20-17:46

1 stop23h 26m

$1,471

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/3

17:55-07:35

2 stops45h 40m

Sydney Kingsford Smith

Tue 24/3

21:25-17:05

1 stop35h 40m

$1,482

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 23/2

13:24-10:05

2 stops51h 41m

Sydney Kingsford Smith

Tue 3/3

11:20-14:53

1 stop20h 33m

$1,488

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/3

19:39-07:25

1 stop43h 46m

Sydney Kingsford Smith

Tue 24/3

14:00-04:49

2 stops30h 49m

$1,492

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/3

19:39-07:25

1 stop43h 46m

Sydney Kingsford Smith

Tue 24/3

14:00-04:49

2 stops30h 49m

$1,503

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/2

08:50-20:50

2 stops43h 00m

Sydney Kingsford Smith

Tue 24/2

11:20-14:53

1 stop20h 33m

$1,506

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/3

19:39-07:25

1 stop43h 46m

Sydney Kingsford Smith

Fri 20/3

14:00-04:49

2 stops30h 49m

$1,525

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

The month of May is, on average, the cheapest month to fly to Sydney from Chicago O'Hare Intl Airport, with most prices found around $1,271. If you aren’t able to travel to Sydney during the month of May, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,276.

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 $1,642 when searching weeks before you fly. 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 $1,362 on momondo.

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

You could potentially save up to 20% 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 January 2026, prices for Chicago O'Hare Intl Airport to Sydney flights are approximately 5% 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 return 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

25h 00m

Direct flights

None
The fastest flight from Chicago O'Hare Intl Airport to Sydney takes 25h 00m
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?

    A flight from Chicago O'Hare Intl to Sydney Kingsford Smith will travel around 14845.8 km. In terms of flight time, this usually takes a little over 25h 00m.

  • 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 a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 necessary travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • 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
Qantas AirwaysPriceFrom $1,307Free cancellationRating
7.5
973 reviews
Search Qantas Airways flights

Travelling to a place near Sydney?

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

Why use momondo?

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

Finding the right flight to Sydney from Chicago is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Sydney quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Chicago to Sydney flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Chicago.

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

If you are simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from Chicago and alert you when they change.

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