What is the cheapest airline that flies from Seattle/Tacoma Intl to Australia?

Philippine Airlines, Qantas Airways, and American Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Australia

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Australia?

Prices for flights from Seattle/Tacoma Intl Airport to Australia were last updated today.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Australia?

There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Australia as of October 2026.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Australia?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport 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.

$697 Cheap Flights from Seattle to Australia in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Australia

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

15:15 - 14:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m2 stops Vancouver Intl Brisbane

11:20 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$1,405Air Canada

Mon, 9 Nov - Tue, 17 Nov

15:15 - 14:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m2 stops Vancouver Intl Brisbane

08:30 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 02m2 stops Brisbane Vancouver Intl

$1,425Air Canada

Mon, 9 Nov - Tue, 17 Nov

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

23h 20m1 stop Vancouver Intl

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

26h 00m1 stop Vancouver Intl

$1,427Air Canada

Wed, 24 Feb - Thu, 11 Mar

19:05 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 - 21:55SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 35m1 stop Vancouver Intl

$1,434Air Canada

Fri, 26 Feb - Mon, 15 Mar

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

23h 20m1 stop Vancouver Intl

11:20 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$1,437Air Canada

Tue, 9 Feb - Sun, 28 Feb

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

$1,438Air Canada

Mon, 1 Feb - Mon, 8 Feb

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

28h 25m1 stop Vancouver Intl

11:20 - 14:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 12m1 stop Vancouver Intl

$1,440Air Canada

Tue, 10 Nov - Tue, 17 Nov

23:55 - 09:45SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 50m1 stop Manila Ninoy Aquino Intl

11:35 - 19:35SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 00m1 stop Manila Ninoy Aquino Intl

$1,443Philippine Airlines

Thu, 8 Apr - Thu, 22 Apr

19:35 - 10:30SEA Seattle/Tacoma Intl-MEL Melbourne

19h 55m1 stop San Francisco

12:45 - 20:47MEL Melbourne-SEA Seattle/Tacoma Intl

27h 02m1 stop San Francisco

$1,781United Airlines

Mon, 9 Nov - Mon, 16 Nov

15:35 - 10:30SEA Seattle/Tacoma Intl-MEL Melbourne

23h 55m1 stop San Francisco

11:30 - 16:12MEL Melbourne-SEA Seattle/Tacoma Intl

23h 42m1 stop Los Angeles

$1,781United Airlines

Wed, 11 Nov - Wed, 18 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

17:04 - 08:05SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 01m1 stop Los Angeles

11:15 - 10:57SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 42m1 stop Los Angeles

$1,529Qantas Airways

Mon, 19 Oct - Mon, 2 Nov

15:18 - 07:55SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 37m1 stop San Francisco

11:50 - 16:27SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 37m1 stop San Francisco

$1,546Lufthansa

Mon, 19 Oct - Mon, 2 Nov

17:04 - 08:05SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 01m1 stop Los Angeles

11:10 - 20:09SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

27h 59m2 stops Los Angeles Phoenix Sky Harbor Intl

$1,549Multiple Airlines

Mon, 19 Oct - Mon, 2 Nov

17:04 - 07:30SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 26m1 stop Los Angeles

11:15 - 12:16SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 01m1 stop Los Angeles

$1,559Multiple Airlines

Mon, 19 Oct - Mon, 26 Oct

14:19 - 07:30SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 11m1 stop Los Angeles

11:15 - 12:52SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 37m1 stop Los Angeles

$1,562Multiple Airlines

Mon, 19 Oct - Mon, 2 Nov

15:20 - 08:05SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 45m1 stop Los Angeles

11:10 - 13:00SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 50m1 stop Los Angeles

$1,565Qantas Airways

Mon, 19 Oct - Mon, 2 Nov

12:16 - 08:00SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 44m1 stop Los Angeles

11:20 - 21:17SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 57m2 stops Los Angeles Denver Intl

$1,573United Airlines

Sun, 18 Oct - Mon, 18 Jan

15:10 - 08:05SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 55m2 stops Phoenix Sky Harbor Intl Los Angeles

11:15 - 13:00SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 45m1 stop Los Angeles

$1,575American Airlines

Mon, 19 Oct - Mon, 2 Nov

14:27 - 08:00SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 33m2 stops Denver Intl Los Angeles

09:20 - 18:12SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

27h 52m2 stops Houston George Bush Intcntl Denver Intl

$1,579United Airlines

Sun, 18 Oct - Mon, 18 Jan

11:05 - 07:50SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 45m2 stops Salt Lake City Los Angeles

09:40 - 16:55SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 15m2 stops Los Angeles Salt Lake City

$1,580Delta

Mon, 19 Oct - Mon, 26 Oct

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Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

8 Apr

SEA23:55Seattle/Tacoma Intl

40h 50m

1 stop

SYD09:45Sydney Kingsford Smith

22 Apr

SYD11:35Sydney Kingsford Smith

25h 00m

1 stop

SEA19:35Seattle/Tacoma Intl

$1,443

Philippine Airlines

12 Apr

SEA23:55Seattle/Tacoma Intl

40h 50m

1 stop

SYD09:45Sydney Kingsford Smith

30 Apr

SYD11:35Sydney Kingsford Smith

25h 00m

1 stop

SEA19:35Seattle/Tacoma Intl

$1,478

Philippine Airlines

2 Nov

SEA21:30Seattle/Tacoma Intl

41h 50m

1 stop

PER07:20Perth

16 Nov

PER08:35Perth

26h 10m

1 stop

SEA18:45Seattle/Tacoma Intl

$1,566

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets

Qantas Airways

1 Nov

SEA16:59Seattle/Tacoma Intl

21h 01m

1 stop

SYD09:00Sydney Kingsford Smith

18 Nov

SYD11:10Sydney Kingsford Smith

22h 02m

1 stop

SEA14:12Seattle/Tacoma Intl

$1,507

Qantas Airways

19 Oct

SEA17:04Seattle/Tacoma Intl

21h 01m

1 stop

SYD08:05Sydney Kingsford Smith

2 Nov

SYD11:15Sydney Kingsford Smith

18h 42m

1 stop

SEA10:57Seattle/Tacoma Intl

$1,529

Qantas Airways

19 Oct

SEA15:20Seattle/Tacoma Intl

22h 45m

1 stop

SYD08:05Sydney Kingsford Smith

2 Nov

SYD11:10Sydney Kingsford Smith

20h 50m

1 stop

SEA13:00Seattle/Tacoma Intl

$1,564

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/11

15:15-14:40

2 stops28h 25m

Sydney Kingsford Smith

Tue 17/11

11:20-09:32

1 stop17h 12m

$1,405

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/11

15:15-14:40

2 stops28h 25m

Sydney Kingsford Smith

Tue 17/11

08:30-09:32

2 stops20h 02m

$1,425

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 24/2

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Thu 11/3

11:20-18:20

1 stop26h 00m

$1,427

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 26/2

19:05-09:35

1 stop19h 30m

Sydney Kingsford Smith

Mon 15/3

11:20-21:55

1 stop28h 35m

$1,434

Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 9/2

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Sun 28/2

11:20-09:32

1 stop17h 12m

$1,437

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

$1,438

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/11

10:10-09:35

1 stop28h 25m

Sydney Kingsford Smith

Tue 17/11

11:20-14:32

1 stop22h 12m

$1,440

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 8/4

23:55-09:45

1 stop40h 50m

Sydney Kingsford Smith

Thu 22/4

11:35-19:35

1 stop25h 00m

$1,443

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Mon 9/11

19:35-10:30

1 stop19h 55m

Melbourne

Mon 16/11

12:45-20:47

1 stop27h 02m

$1,781

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Wed 11/11

15:35-10:30

1 stop23h 55m

Melbourne

Wed 18/11

11:30-16:12

1 stop23h 42m

$1,781

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 Seattle 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

What is the cheapest month to fly to Australia?

In general, August is the cheapest month to fly from Seattle to Australia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,499. If you don’t want to visit Australia in August, then you should wait until February to fly from Seattle, when ticket prices are also cheap, with an average price of $1,514.

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

You are more likely to see cheaper flights to Australia from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,670 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 Seattle for as low as $1,464 on momondo.

Can stopping save me money on Seattle to Australia flights?

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

Cheap Seattle to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Australia

Best price found	$697
Fastest flight time	17h 45m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $697. The best return flight deal from Seattle to Australia found on momondo in the last 72 hours is $1,405.

The fastest flight from Seattle to Australia takes 17h 45m

There are no direct flights from Seattle to Australia. There are no popular flight routes from Seattle to Australia.

Search flight deals

Frequently asked questions about flying from Seattle to Australia

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Australia?
Prices for flights from Seattle/Tacoma Intl Airport to Australia were last updated today.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Australia?
There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Australia as of October 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Australia?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport 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 Seattle to Australia

Compare and see reviews for airlines that fly from Seattle to Australia with momondo

Airline	Rating	Free cancellation	Price
United Airlines	PriceFrom $1,451	Free cancellation	Rating 7.4 10,362 reviews		Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle 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 Seattle to Australia for you.

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

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

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

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

If you are not ready to book a flight from Seattle to Australia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Australia and let you know when they change.