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

United Airlines, Qantas Airways, and Delta 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 50m on average. If you fly from Spokane (another popular airport in State of Washington) to Sydney, then the average flight time is 18h 38m.

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 June 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.

$616 Cheap Flights from Washington to Australia in 2026

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.

23:10 - 06:30

SEA

MEL

38h 20m

1 stop

07:30 - 20:05

MEL

SEA

30h 35m

1 stop

$1,419Philippine Airlines

Tue, 15 Sep - Tue, 6 Oct

10:34 - 11:50

SEA

SYD

32h 16m

2 stops

13:15 - 10:39

SYD

SEA

38h 24m

3 stops

$1,430Multiple Airlines

Mon, 17 Aug - Fri, 28 Aug

05:45 - 07:20

SEA

SYD

32h 35m

1 stop

09:20 - 22:42

SYD

SEA

30h 22m

1 stop

$1,432Air Canada

Sun, 5 Jul - Sun, 19 Jul

05:45 - 07:20

SEA

SYD

32h 35m

1 stop

09:20 - 22:42

SYD

SEA

30h 22m

1 stop

$1,450Air Canada

Sun, 5 Jul - Sun, 19 Jul

15:30 - 06:55

SEA

SYD

22h 25m

1 stop

10:30 - 15:50

SYD

SEA

23h 20m

1 stop

$1,452United Airlines

Tue, 22 Sep - Wed, 7 Oct

11:40 - 06:45

SEA

MEL

26h 05m

1 stop

13:35 - 22:26

MEL

SEA

25h 51m

1 stop

$1,516American Airlines

Thu, 6 Aug - Wed, 19 Aug

17:10 - 06:45

SEA

MEL

20h 35m

1 stop

09:45 - 12:20

MEL

SEA

19h 35m

1 stop

$1,525Qantas Airways

Thu, 6 Aug - Wed, 19 Aug

19:05 - 08:15

SEA

MEL

20h 10m

1 stop

09:30 - 15:45

MEL

SEA

23h 15m

1 stop

$1,526United Airlines

Thu, 6 Aug - Wed, 19 Aug

17:02 - 06:45

SEA

MEL

20h 43m

1 stop

09:45 - 16:32

MEL

SEA

23h 47m

1 stop

$1,529American Airlines

Thu, 6 Aug - Wed, 19 Aug

18:00 - 15:50

PDX

AVV

27h 50m

2 stops

14:50 - 20:49

AVV

PDX

24h 59m

2 stops

$2,780Qantas Airways

Mon, 26 Oct - Thu, 19 Nov

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United Airlines flights from State of Washington to Australia

Our best United Airlines deals on State of Washington to Australia flight tickets

United Airlines

22 Sept

SEA15:30Seattle/Tacoma Intl

22h 25m

1 stop

SYD06:55Sydney Kingsford Smith

7 Oct

SYD10:30Sydney Kingsford Smith

23h 20m

1 stop

SEA15:50Seattle/Tacoma Intl

$1,452

United Airlines

26 Sept

SEA08:46Seattle/Tacoma Intl

29h 09m

1 stop

SYD06:55Sydney Kingsford Smith

12 Oct

SYD11:20Sydney Kingsford Smith

19h 03m

1 stop

SEA12:23Seattle/Tacoma Intl

$1,523

United Airlines

6 Aug

SEA19:05Seattle/Tacoma Intl

20h 10m

1 stop

MEL08:15Melbourne

19 Aug

MEL09:30Melbourne

23h 15m

1 stop

SEA15:45Seattle/Tacoma Intl

$1,526

Alaska Airlines flights from State of Washington to Australia

Our best Alaska Airlines deals on State of Washington to Australia flight tickets

Alaska Airlines

24 Aug

PDX08:00Portland

17h 50m

1 stop

SYD18:50Sydney Kingsford Smith

30 Aug

SYD20:45Sydney Kingsford Smith

17h 01m

1 stop

PDX20:46Portland

$1,542

Alaska Airlines

31 Aug

PDX08:00Portland

17h 50m

1 stop

SYD18:50Sydney Kingsford Smith

13 Sept

SYD20:45Sydney Kingsford Smith

17h 01m

1 stop

PDX20:46Portland

$1,562

Alaska Airlines

23 June

SEA21:10Seattle/Tacoma Intl

28h 40m

1 stop

SYD18:50Sydney Kingsford Smith

30 June

SYD20:45Sydney Kingsford Smith

17h 49m

1 stop

SEA21:34Seattle/Tacoma Intl

$1,563

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 15/9

23:10-06:30

1 stop38h 20m

Melbourne

Tue 6/10

07:30-20:05

1 stop30h 35m

$1,419

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 17/8

10:34-11:50

2 stops32h 16m

Sydney Kingsford Smith

Fri 28/8

13:15-10:39

3 stops38h 24m

$1,430

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/7

05:45-07:20

1 stop32h 35m

Sydney Kingsford Smith

Sun 19/7

09:20-22:42

1 stop30h 22m

$1,432

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/7

05:45-07:20

1 stop32h 35m

Sydney Kingsford Smith

Sun 19/7

09:20-22:42

1 stop30h 22m

$1,450

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 22/9

15:30-06:55

1 stop22h 25m

Sydney Kingsford Smith

Wed 7/10

10:30-15:50

1 stop23h 20m

$1,452

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 6/8

11:40-06:45

1 stop26h 05m

Melbourne

Wed 19/8

13:35-22:26

1 stop25h 51m

$1,516

Fastest return journey

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 6/8

17:10-06:45

1 stop20h 35m

Melbourne

Wed 19/8

09:45-12:20

1 stop19h 35m

$1,525

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 6/8

19:05-08:15

1 stop20h 10m

Melbourne

Wed 19/8

09:30-15:45

1 stop23h 15m

$1,526

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 6/8

17:02-06:45

1 stop20h 43m

Melbourne

Wed 19/8

09:45-16:32

1 stop23h 47m

$1,529

PortlandMelbourne

PDX - AVV

PDXAVV

Portland

Mon 26/10

18:00-15:50

2 stops27h 50m

Melbourne Avalon

Thu 19/11

14:50-20:49

2 stops24h 59m

$2,780

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, January 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 $138. If you don’t want to visit Australia in January, then you should wait until February to fly from State of Washington, when ticket prices are also cheap, with an average price of $203.

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 $1,519 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 $1,332 on momondo.

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

You could potentially save up to 25% 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

Fastest flight time	17h 50m
Direct flights	None

The fastest flight from State of Washington to Australia takes 17h 50m

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

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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 June 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 $1,139	Free cancellation	Rating 7.4 9,865 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.