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Cheap flights from Chicago O'Hare Intl Airport to Sydney from $618

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 1/12. 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.
Air Canada Logo
20:15 - 08:35ORD-SYD
44h 20m2 stops
Air Canada Logo
09:20 - 19:25SYD-ORD
25h 05m2 stops
$1,289Air Canada
Find Deal
Mon, 23 Mar - Tue, 14 Apr
Air Canada Logo
15:40 - 08:35ORD-SYD
24h 55m1 stop
Air Canada Logo
06:30 - 14:43SYD-ORD
23h 13m2 stops
$1,292Air Canada
Find Deal
Tue, 24 Mar - Tue, 7 Apr
Air Canada Logo
21:05 - 09:35ORD-SYD
43h 30m2 stops
Air Canada Logo
11:20 - 16:38SYD-ORD
22h 18m1 stop
$1,295Air Canada
Find Deal
Mon, 16 Feb - Mon, 23 Feb
Air Canada Logo
13:05 - 14:40ORD-SYD
32h 35m2 stops
Air Canada Logo
11:20 - 14:41SYD-ORD
20h 21m1 stop
$1,298Air Canada
Find Deal
Wed, 18 Feb - Sun, 22 Feb
United Airlines Logo
18:20 - 09:05ORD-SYD
22h 45m1 stop
United Airlines Logo
09:30 - 16:40SYD-ORD
22h 10m1 stop
$1,300United Airlines
Find Deal
Wed, 25 Mar - Sun, 12 Apr
United Airlines Logo
19:35 - 09:15ORD-SYD
21h 40m1 stop
United Airlines Logo
09:30 - 16:40SYD-ORD
22h 10m1 stop
$1,304United Airlines
Find Deal
Thu, 26 Mar - Sun, 12 Apr
Multiple Airlines Logo
15:40 - 14:50ORD-SYD
30h 10m2 stops
Multiple Airlines Logo
11:20 - 16:42SYD-ORD
22h 22m1 stop
$1,307Multiple Airlines
Find Deal
Sat, 17 Jan - Tue, 3 Feb
Multiple Airlines Logo
15:40 - 15:55ORD-SYD
31h 15m2 stops
Multiple Airlines Logo
19:15 - 14:41SYD-ORD
36h 26m2 stops
$1,325Multiple Airlines
Find Deal
Sun, 7 Dec - Sat, 13 Dec
Qantas Airways Logo
14:15 - 09:00ORD-SYD
25h 45m1 stop
Qantas Airways Logo
11:20 - 16:49SYD-ORD
22h 29m1 stop
$1,330Qantas Airways
Find Deal
Wed, 21 Jan - Fri, 30 Jan
Qantas Airways Logo
18:40 - 09:00ORD-SYD
21h 20m1 stop
Qantas Airways Logo
11:20 - 14:57SYD-ORD
20h 37m1 stop
$1,333Qantas Airways
Find Deal
Wed, 21 Jan - Fri, 30 Jan

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
21 Jan
ORD14:15Chicago O'Hare Intl
25h 45m
1 stop
SYD09:00Sydney Kingsford Smith
30 Jan
SYD11:20Sydney Kingsford Smith
22h 29m
1 stop
ORD16:49Chicago O'Hare Intl
$1,330
Find similar
Qantas Airways
21 Jan
ORD18:40Chicago O'Hare Intl
21h 20m
1 stop
SYD09:00Sydney Kingsford Smith
30 Jan
SYD11:20Sydney Kingsford Smith
20h 37m
1 stop
ORD14:57Chicago O'Hare Intl
$1,333
Find similar
Qantas Airways
29 Dec
ORD21:04Chicago O'Hare Intl
42h 56m
1 stop
SYD09:00Sydney Kingsford Smith
11 Jan
SYD21:25Sydney Kingsford Smith
39h 35m
1 stop
ORD20:00Chicago O'Hare Intl
$1,342
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
23 Mar
ORD20:15Chicago O'Hare Intl
44h 20m
2 stops
SYD08:35Sydney Kingsford Smith
14 Apr
SYD09:20Sydney Kingsford Smith
25h 05m
2 stops
ORD19:25Chicago O'Hare Intl
$1,289
Find similar
Air Canada
24 Mar
ORD15:40Chicago O'Hare Intl
24h 55m
1 stop
SYD08:35Sydney Kingsford Smith
7 Apr
SYD06:30Sydney Kingsford Smith
23h 13m
2 stops
ORD14:43Chicago O'Hare Intl
$1,292
Find similar
Air Canada
16 Feb
ORD21:05Chicago O'Hare Intl
43h 30m
2 stops
SYD09:35Sydney Kingsford Smith
23 Feb
SYD11:20Sydney Kingsford Smith
22h 18m
1 stop
ORD16:38Chicago O'Hare Intl
$1,295
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 28 October 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

Mon 23/3

20:15-08:35

2 stops44h 20m

Sydney Kingsford Smith

Tue 14/4

09:20-19:25

2 stops25h 05m

$1,289

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Tue 24/3

15:40-08:35

1 stop24h 55m

Sydney Kingsford Smith

Tue 7/4

06:30-14:43

2 stops23h 13m

$1,292

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Mon 16/2

21:05-09:35

2 stops43h 30m

Sydney Kingsford Smith

Mon 23/2

11:20-16:38

1 stop22h 18m

$1,295

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 18/2

13:05-14:40

2 stops32h 35m

Sydney Kingsford Smith

Sun 22/2

11:20-14:41

1 stop20h 21m

$1,298

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 25/3

18:20-09:05

1 stop22h 45m

Sydney Kingsford Smith

Sun 12/4

09:30-16:40

1 stop22h 10m

$1,300

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Thu 26/3

19:35-09:15

1 stop21h 40m

Sydney Kingsford Smith

Sun 12/4

09:30-16:40

1 stop22h 10m

$1,304

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sat 17/1

15:40-14:50

2 stops30h 10m

Sydney Kingsford Smith

Tue 3/2

11:20-16:42

1 stop22h 22m

$1,307

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Sun 7/12

15:40-15:55

2 stops31h 15m

Sydney Kingsford Smith

Sat 13/12

19:15-14:41

2 stops36h 26m

$1,325

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 21/1

14:15-09:00

1 stop25h 45m

Sydney Kingsford Smith

Fri 30/1

11:20-16:49

1 stop22h 29m

$1,330

ChicagoSydney

ORD - SYD

ORDSYD

Chicago O'Hare Intl

Wed 21/1

18:40-09:00

1 stop21h 20m

Sydney Kingsford Smith

Fri 30/1

11:20-14:57

1 stop20h 37m

$1,333

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Chicago O'Hare Intl Airport and Sydney?

What is the cheapest month to fly to Sydney?

The month of March is, on average, the cheapest month to fly to Sydney from Chicago O'Hare Intl Airport, with most prices found around $1,307. If you aren’t able to travel to Sydney during the month of March, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $1,330.

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 $1,802. The most expensive day to fly to Sydney is Tuesday, with ticket prices averaging around $2,475.

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 $2,109. 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 $3,224 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 $1,647 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 $1,312 on momondo.

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

You could potentially save up to 38% 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 October 2025, prices for Chicago O'Hare Intl Airport to Sydney flights are approximately 61% 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

Direct flights

None
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.
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  • 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 $1,308Free cancellationRating
7.2
11,034 reviews
Search American Airlines flights
Qantas AirwaysPriceFrom $1,335Free cancellationRating
7.5
924 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
Randwick
Cronulla
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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