What is the cheapest airline that flies from Washington to Australia?

United Airlines, Air Canada, and Philippine Airlines are the most popular carriers operating from Washington to Australia

How long is the flight from State of Washington to Australia?

The flight from State of Washington to Australia depends on which airports you’re departing from and arriving to, and whether or not you have a layover. If you fly from Seattle (a popular airport in State of Washington) to Sydney (the most popular airport in Australia), then the flight time is 17h 45m on average. If you fly from Spokane (another popular airport in State of Washington) to Sydney, then the average flight time is 22h 12m.

When did momondo last update prices for flights from Washington to Australia?

Prices for flights from Washington to Australia were last updated today.

How many operators does momondo search for flights from Washington to Australia?

As of September 2026, there is 1 operator available to choose from for flights from Washington to Australia.

How old do you have to be to fly from Washington to Australia?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Australia.

What documentation or ID do you need to fly to Australia?

The necessary travel and health documents for your Australia 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.

$689 Cheap Flights from Washington to Australia in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington to Australia

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

19:05 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,280Air Canada

Sun, 25 Oct - Sun, 8 Nov

19:05 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,344Air Canada

Sun, 25 Oct - Sun, 8 Nov

15:15 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,348Air Canada

Mon, 1 Feb - Mon, 8 Feb

15:15 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 - 18:22SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$1,348Air Canada

Wed, 3 Feb - Tue, 9 Feb

19:05 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,349Air Canada

Sun, 25 Oct - Sun, 8 Nov

10:10 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,351Air Canada

Mon, 9 Nov - Mon, 23 Nov

15:15 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,351Air Canada

Sun, 25 Oct - Mon, 9 Nov

08:40 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 55m1 stop Vancouver Intl

11:20 - 18:22SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$1,351Air Canada

Tue, 27 Oct - Tue, 10 Nov

15:30 - 06:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 50m1 stop San Francisco

09:15 - 22:38SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

32h 23m1 stop Houston George Bush Intcntl

$1,489United Airlines

Wed, 3 Feb - Mon, 22 Feb

12:30 - 06:20GEG Spokane-SYD Sydney Kingsford Smith

22h 50m1 stop San Francisco

11:50 - 11:28SYD Sydney Kingsford Smith-GEG Spokane

18h 38m1 stop San Francisco

$1,543United Airlines

Wed, 2 Dec - Tue, 15 Dec

Cheap last-minute flights

Enter your travel dates to find the best prices.

23:10 - 07:15SEA Seattle/Tacoma Intl-PER Perth

41h 05m1 stop Manila Ninoy Aquino Intl

08:35 - 20:05PER Perth-SEA Seattle/Tacoma Intl

26h 30m1 stop Manila Ninoy Aquino Intl

$1,703Philippine Airlines

Fri, 25 Sep - Thu, 8 Oct

11:45 - 22:40SEA Seattle/Tacoma Intl-PER Perth

43h 55m1 stop Hong Kong Intl

00:25 - 09:45PER Perth-SEA Seattle/Tacoma Intl

24h 20m1 stop Hong Kong Intl

$1,811Cathay Pacific

Tue, 29 Sep - Tue, 27 Oct

23:10 - 08:55SEA Seattle/Tacoma Intl-PER Perth

42h 45m2 stops Manila Ninoy Aquino Intl Ho Chi Minh City

10:35 - 08:05PER Perth-SEA Seattle/Tacoma Intl

36h 30m1 stop Singapore Changi

$1,818Multiple Airlines

Tue, 29 Sep - Wed, 28 Oct

11:45 - 22:40SEA Seattle/Tacoma Intl-PER Perth

43h 55m1 stop Hong Kong Intl

08:30 - 09:45PER Perth-SEA Seattle/Tacoma Intl

40h 15m1 stop Hong Kong Intl

$1,843Cathay Pacific

Tue, 29 Sep - Mon, 26 Oct

23:10 - 08:55SEA Seattle/Tacoma Intl-PER Perth

42h 45m2 stops Manila Ninoy Aquino Intl Ho Chi Minh City

17:50 - 08:05PER Perth-SEA Seattle/Tacoma Intl

29h 15m1 stop Singapore Changi

$1,857Multiple Airlines

Tue, 29 Sep - Thu, 29 Oct

19:10 - 22:40SEA Seattle/Tacoma Intl-PER Perth

36h 30m2 stops Los Angeles Hong Kong Intl

00:25 - 09:45PER Perth-SEA Seattle/Tacoma Intl

24h 20m1 stop Hong Kong Intl

$1,873Cathay Pacific

Mon, 28 Sep - Mon, 26 Oct

11:45 - 22:40SEA Seattle/Tacoma Intl-PER Perth

43h 55m1 stop Hong Kong Intl

00:25 - 09:45PER Perth-SEA Seattle/Tacoma Intl

24h 20m1 stop Hong Kong Intl

$1,881Cathay Pacific

Mon, 28 Sep - Mon, 26 Oct

23:10 - 08:00SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 50m1 stop Manila Ninoy Aquino Intl

11:15 - 22:47SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

29h 32m2 stops Manila Ninoy Aquino Intl Vancouver Intl

$1,900Multiple Airlines

Sun, 27 Sep - Wed, 7 Oct

11:45 - 22:40SEA Seattle/Tacoma Intl-PER Perth

43h 55m1 stop Hong Kong Intl

00:25 - 16:04PER Perth-SEA Seattle/Tacoma Intl

30h 39m2 stops Hong Kong Intl San Francisco

$1,910Multiple Airlines

Tue, 29 Sep - Tue, 27 Oct

17:59 - 22:40SEA Seattle/Tacoma Intl-PER Perth

37h 41m2 stops Los Angeles Hong Kong Intl

00:25 - 09:45PER Perth-SEA Seattle/Tacoma Intl

24h 20m1 stop Hong Kong Intl

$1,912Cathay Pacific

Sun, 27 Sep - Sun, 25 Oct

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Air New Zealand flights from State of Washington to Australia

Our best Air New Zealand deals on State of Washington to Australia flight tickets

Air New Zealand

1 Nov

SEA19:05Seattle/Tacoma Intl

19h 30m

1 stop

SYD09:35Sydney Kingsford Smith

16 Nov

SYD11:20Sydney Kingsford Smith

22h 17m

1 stop

SEA14:37Seattle/Tacoma Intl

$1,410

Air New Zealand

21 Oct

SEA15:00Seattle/Tacoma Intl

37h 20m

2 stops

SYD22:20Sydney Kingsford Smith

4 Nov

SYD11:20Sydney Kingsford Smith

26h 02m

1 stop

SEA18:22Seattle/Tacoma Intl

$1,441

Air New Zealand

13 Feb

GEG17:47Spokane

43h 48m

2 stops

SYD08:35Sydney Kingsford Smith

20 Feb

SYD19:25Sydney Kingsford Smith

39h 43m

2 stops

GEG16:08Spokane

$1,651

Qantas Airways flights from State of Washington to Australia

Our best Qantas Airways deals on State of Washington to Australia flight tickets

Qantas Airways

4 Nov

GEG17:24Spokane

20h 36m

1 stop

SYD09:00Sydney Kingsford Smith

11 Nov

SYD14:05Sydney Kingsford Smith

25h 35m

1 stop

GEG20:40Spokane

$1,437

Qantas Airways

28 Oct

GEG14:51Spokane

24h 09m

1 stop

SYD09:00Sydney Kingsford Smith

10 Nov

SYD14:05Sydney Kingsford Smith

25h 35m

1 stop

GEG20:40Spokane

$1,485

Qantas Airways

13 Nov

GEG13:08Spokane

22h 17m

1 stop

SYD06:25Sydney Kingsford Smith

20 Nov

SYD10:25Sydney Kingsford Smith

22h 49m

2 stops

GEG14:14Spokane

$1,624

momondo Fare Finder

Use the filters below to find and compare flights from Washington to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 25/10

19:05-08:35

1 stop19h 30m

Sydney Kingsford Smith

Sun 8/11

11:20-14:37

1 stop22h 17m

$1,280

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 25/10

19:05-08:35

1 stop19h 30m

Sydney Kingsford Smith

Sun 8/11

11:20-14:37

1 stop22h 17m

$1,344

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 1/2

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Mon 8/2

11:20-14:37

1 stop22h 17m

$1,348

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/2

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Tue 9/2

11:20-18:22

1 stop26h 02m

$1,348

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 25/10

19:05-08:35

1 stop19h 30m

Sydney Kingsford Smith

Sun 8/11

11:20-14:37

1 stop22h 17m

$1,349

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/11

10:10-09:35

1 stop28h 25m

Sydney Kingsford Smith

Mon 23/11

11:20-14:37

1 stop22h 17m

$1,351

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 25/10

15:15-08:35

1 stop23h 20m

Sydney Kingsford Smith

Mon 9/11

11:20-14:37

1 stop22h 17m

$1,351

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 27/10

08:40-08:35

1 stop29h 55m

Sydney Kingsford Smith

Tue 10/11

11:20-18:22

1 stop26h 02m

$1,351

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/2

15:30-06:20

1 stop19h 50m

Sydney Kingsford Smith

Mon 22/2

09:15-22:38

1 stop32h 23m

$1,489

Fastest return journey

SpokaneSydney

GEG Spokane - SYD Sydney Kingsford Smith

GEGSYD

Spokane

Wed 2/12

12:30-06:20

1 stop22h 50m

Sydney Kingsford Smith

Tue 15/12

11:50-11:28

1 stop18h 38m

$1,543

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from State of Washington to Australia

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

Prices

Airlines

Other information

What is the cheapest month to fly to Australia?

In general, February is the cheapest month to fly from State of Washington to Australia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,463. If you don’t want to visit Australia in February, then you should wait until August to fly from State of Washington, when ticket prices are also cheap, with an average price of $1,478.

How far in advance should I book a flight from Washington to Australia?

You are more likely to see cheaper flights to Australia from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,637 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from State of Washington for as low as $1,429 on momondo.

Can stopping save me money on State of Washington to Australia flights?

You could potentially save up to 10% on your flight if you consider stops on a State of Washington to Australia flight.

Cheap State of Washington to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Australia

Best price found	$689
Fastest flight time	17h 45m
Direct flights	None

The best one-way flight to Australia from State of Washington in the past 72 hours is $689. The best return flight deal from State of Washington to Australia found on momondo in the last 72 hours is $1,280.

The fastest flight from State of Washington to Australia takes 17h 45m

There are no direct flights from State of Washington to Australia. There are no popular flight routes from State of Washington to Australia.

Search flight deals

Frequently asked questions about flying from Washington to Australia

When did momondo last update prices for flights from Washington to Australia?
Prices for flights from Washington to Australia were last updated today.
How many operators does momondo search for flights from Washington to Australia?
As of September 2026, there is 1 operator available to choose from for flights from Washington to Australia.
How old do you have to be to fly from Washington to Australia?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Australia.
What documentation or ID do you need to fly to Australia?
The necessary travel and health documents for your Australia 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.

Best airlines flying from State of Washington to Australia

Compare and see reviews for airlines that fly from State of Washington to Australia with momondo

Airline	Rating	Free cancellation	Price
United Airlines	PriceFrom $1,431	Free cancellation	Rating 7.4 10,233 reviews		Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Australia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington to Australia for you.

Can I find flights from Washington to Australia with flexible booking policies on momondo?

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

How can momondo help me find flights from Washington to Australia?

Once all potential Washington to Australia 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 Washington to Australia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Washington to Australia 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.