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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $830

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 26/1. 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
18:40 - 09:00
ORD
-
SYD
21h 20m1 stop
Qantas Airways Logo
07:05 - 14:57
SYD
-
ORD
24h 52m2 stops
$1,357Qantas Airways
Tue, 20 Jan - Wed, 28 Jan
Air Canada Logo
15:35 - 09:35
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 - 14:41
SYD
-
ORD
20h 21m1 stop
$1,365Air Canada
Sun, 1 Feb - Sun, 15 Feb
Qantas Airways Logo
14:15 - 09:10
ORD
-
SYD
49h 55m2 stops
Qantas Airways Logo
11:20 - 14:57
SYD
-
ORD
20h 37m1 stop
$1,368Qantas Airways
Sat, 24 Jan - Sat, 31 Jan
Air Canada Logo
15:35 - 09:35
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 - 20:10
SYD
-
ORD
25h 50m2 stops
$1,369Air Canada
Sun, 1 Feb - Sun, 15 Feb
Qantas Airways Logo
17:30 - 09:10
ORD
-
SYD
46h 40m2 stops
Qantas Airways Logo
11:20 - 14:57
SYD
-
ORD
20h 37m1 stop
$1,372Qantas Airways
Sat, 17 Jan - Sun, 1 Feb
Air Canada Logo
15:35 - 09:35
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 - 14:41
SYD
-
ORD
20h 21m1 stop
$1,422Air Canada
Sun, 25 Jan - Sun, 8 Feb
Air Canada Logo
15:35 - 09:35
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 - 20:10
SYD
-
ORD
25h 50m2 stops
$1,428Air Canada
Sun, 25 Jan - Sun, 8 Feb
Qantas Airways Logo
18:40 - 09:00
ORD
-
SYD
21h 20m1 stop
Qantas Airways Logo
07:05 - 16:49
SYD
-
ORD
26h 44m2 stops
$1,434Qantas Airways
Tue, 20 Jan - Wed, 28 Jan
Air Canada Logo
08:45 - 09:35
ORD
-
SYD
31h 50m2 stops
Air Canada Logo
11:20 - 14:41
SYD
-
ORD
20h 21m1 stop
$1,436Air Canada
Sun, 8 Feb - Sun, 15 Feb
Air Canada Logo
15:35 - 09:35
ORD
-
SYD
25h 00m1 stop
Air Canada Logo
11:20 - 16:38
SYD
-
ORD
22h 18m1 stop
$1,437Air Canada
Tue, 10 Feb - Wed, 25 Feb

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
20 Jan
ORD18:40Chicago O'Hare Intl
21h 20m
1 stop
SYD09:00Sydney Kingsford Smith
28 Jan
SYD07:05Sydney Kingsford Smith
24h 52m
2 stops
ORD14:57Chicago O'Hare Intl
$1,357
Find similar
Qantas Airways
24 Jan
ORD14:15Chicago O'Hare Intl
49h 55m
2 stops
SYD09:10Sydney Kingsford Smith
31 Jan
SYD11:20Sydney Kingsford Smith
20h 37m
1 stop
ORD14:57Chicago O'Hare Intl
$1,368
Find similar
Qantas Airways
17 Jan
ORD17:30Chicago O'Hare Intl
46h 40m
2 stops
SYD09:10Sydney Kingsford Smith
1 Feb
SYD11:20Sydney Kingsford Smith
20h 37m
1 stop
ORD14:57Chicago O'Hare Intl
$1,372
Find similar

Air New Zealand flights from Chicago O'Hare Intl Airport to Sydney

Our best Air New Zealand deals on Chicago O'Hare Intl Airport to Sydney flight tickets
Air New Zealand
11 Dec
ORD14:21Chicago O'Hare Intl
25h 24m
2 stops
SYD08:45Sydney Kingsford Smith
13 Dec
SYD11:45Sydney Kingsford Smith
44h 03m
2 stops
ORD14:48Chicago O'Hare Intl
$2,455
Find similar
Air New Zealand
21 Dec
ORD06:00Chicago O'Hare Intl
35h 30m
2 stops
SYD10:30Sydney Kingsford Smith
10 Jan
SYD13:55Sydney Kingsford Smith
22h 55m
2 stops
ORD19:50Chicago O'Hare Intl
$2,729
Find similar
Air New Zealand
24 Dec
ORD18:32Chicago O'Hare Intl
21h 33m
1 stop
SYD09:05Sydney Kingsford Smith
14 Jan
SYD11:45Sydney Kingsford Smith
26h 41m
2 stops
ORD21:26Chicago O'Hare Intl
$2,984
Find similar

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 10 December 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

Tue 20/1

18:40-09:00

1 stop21h 20m

Sydney Kingsford Smith

Wed 28/1

07:05-14:57

2 stops24h 52m

$1,357

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 1/2

15:35-09:35

1 stop25h 00m

Sydney Kingsford Smith

Sun 15/2

11:20-14:41

1 stop20h 21m

$1,365

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 24/1

14:15-09:10

2 stops49h 55m

Sydney Kingsford Smith

Sat 31/1

11:20-14:57

1 stop20h 37m

$1,368

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 1/2

15:35-09:35

1 stop25h 00m

Sydney Kingsford Smith

Sun 15/2

11:20-20:10

2 stops25h 50m

$1,369

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 17/1

17:30-09:10

2 stops46h 40m

Sydney Kingsford Smith

Sun 1/2

11:20-14:57

1 stop20h 37m

$1,372

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 25/1

15:35-09:35

1 stop25h 00m

Sydney Kingsford Smith

Sun 8/2

11:20-14:41

1 stop20h 21m

$1,422

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 25/1

15:35-09:35

1 stop25h 00m

Sydney Kingsford Smith

Sun 8/2

11:20-20:10

2 stops25h 50m

$1,428

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 20/1

18:40-09:00

1 stop21h 20m

Sydney Kingsford Smith

Wed 28/1

07:05-16:49

2 stops26h 44m

$1,434

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 8/2

08:45-09:35

2 stops31h 50m

Sydney Kingsford Smith

Sun 15/2

11:20-14:41

1 stop20h 21m

$1,436

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 10/2

15:35-09:35

1 stop25h 00m

Sydney Kingsford Smith

Wed 25/2

11:20-16:38

1 stop22h 18m

$1,437

Flights are sorted by cheapest return 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?

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 $1,279. 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 $1,282.

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

Our data shows that Sunday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $1,778. The most expensive day to fly to Sydney is Tuesday, with ticket prices averaging around $2,442.

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 afternoon. momondo users have found flights departing from Chicago O'Hare Intl Airport to Sydney in the afternoon for as low as $2,080. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are $3,180 on average. Flights to Sydney from Chicago O'Hare Intl Airport at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 $1,622 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 $1,282 on momondo.

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

You could potentially save up to 37% 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 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

21h 20m

Direct flights

None
The fastest flight from Chicago O'Hare Intl Airport to Sydney takes 21h 20m
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 21h 20m.

  • 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
American AirlinesPriceFrom $1,291Free cancellationRating
7.2
11,048 reviews
Search American Airlines flights
Qantas AirwaysPriceFrom $1,316Free cancellationRating
7.5
947 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
Terrigal
Penrith
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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