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

United Airlines, Delta, and Alaska 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 August 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.

$669 Cheap Flights from Seattle to Australia in 2026

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.

15:00 - 11:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

10:20 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$1,210Air Canada

Sun, 11 Oct - Sun, 18 Oct

15:00 - 11:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

07:00 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 05m2 stops Brisbane Vancouver Intl

$1,228Air Canada

Sun, 11 Oct - Sun, 18 Oct

15:00 - 11:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

07:00 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 05m2 stops Brisbane Vancouver Intl

$1,230Air Canada

Sun, 11 Oct - Sun, 18 Oct

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

$1,255Air Canada

Wed, 4 Nov - Wed, 11 Nov

19:05 - 09:35SEA 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

$1,256Air Canada

Mon, 1 Feb - Mon, 15 Feb

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

23h 20m1 stop Vancouver Intl

11:20 - 09:27SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 07m1 stop Vancouver Intl

$1,256Air Canada

Tue, 9 Feb - Sun, 28 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

$1,256Air Canada

Sun, 25 Oct - Mon, 9 Nov

19:15 - 08:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 05m1 stop Vancouver Intl

10:20 - 09:17SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 57m1 stop Vancouver Intl

$1,256Air Canada

Sun, 18 Oct - Wed, 28 Oct

18:51 - 09:30SEA Seattle/Tacoma Intl-MEL Melbourne

19h 39m1 stop Los Angeles Los Angeles

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

18h 27m1 stop San Francisco

$1,532United Airlines

Sun, 14 Feb - Mon, 22 Feb

19:32 - 10:30SEA Seattle/Tacoma Intl-MEL Melbourne

19h 58m1 stop San Francisco

11:30 - 15:54MEL Melbourne-SEA Seattle/Tacoma Intl

23h 24m2 stops Los Angeles Los Angeles San Francisco

$1,545United Airlines

Wed, 27 Jan - Tue, 16 Feb

Cheap last-minute flights

Enter your travel dates to find the best prices.

15:00 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

06:30 - 22:47SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

33h 17m2 stops Brisbane Vancouver Intl

$1,401Air Canada

Sat, 5 Sep - Mon, 21 Sep

19:20 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 00m1 stop Vancouver Intl

06:30 - 22:47SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

33h 17m2 stops Brisbane Vancouver Intl

$1,403Air Canada

Sat, 5 Sep - Mon, 21 Sep

15:00 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

06:30 - 22:47SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

33h 17m2 stops Brisbane Vancouver Intl

$1,403Air Canada

Sat, 5 Sep - Mon, 21 Sep

15:00 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:00 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

41h 05m2 stops Brisbane Vancouver Intl

$1,411Air Canada

Sat, 5 Sep - Mon, 21 Sep

15:00 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

09:20 - 14:17SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 57m1 stop Vancouver Intl

$1,418Air Canada

Sat, 5 Sep - Mon, 21 Sep

19:20 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 00m1 stop Vancouver Intl

09:20 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$1,419Air Canada

Sat, 5 Sep - Mon, 21 Sep

15:00 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

09:20 - 18:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,419Air Canada

Sat, 5 Sep - Mon, 21 Sep

12:25 - 06:50SEA Seattle/Tacoma Intl-PER Perth

27h 25m1 stop Hong Kong Intl

08:20 - 10:05PER Perth-SEA Seattle/Tacoma Intl

40h 45m1 stop Hong Kong Intl

$1,620Cathay Pacific

Thu, 3 Sep - Wed, 16 Sep

12:25 - 06:50SEA Seattle/Tacoma Intl-PER Perth

27h 25m1 stop Hong Kong Intl

08:20 - 10:05PER Perth-SEA Seattle/Tacoma Intl

40h 45m1 stop Hong Kong Intl

$1,665Cathay Pacific

Thu, 3 Sep - Wed, 16 Sep

12:44 - 06:30SEA Seattle/Tacoma Intl-BNE Brisbane

24h 46m2 stops Denver Intl San Francisco

20:45 - 21:31BNE Brisbane-SEA Seattle/Tacoma Intl

41h 46m3 stops Sydney Kingsford Smith Los Angeles Los Angeles Denver Intl

$3,140United Airlines

Wed, 2 Sep - Fri, 4 Sep

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Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

11 Oct

SEA15:00Seattle/Tacoma Intl

26h 40m

2 stops

SYD11:40Sydney Kingsford Smith

18 Oct

SYD10:20Sydney Kingsford Smith

17h 45m

1 stop

SEA10:05Seattle/Tacoma Intl

$1,210

Air Canada

11 Oct

SEA15:00Seattle/Tacoma Intl

26h 40m

2 stops

SYD11:40Sydney Kingsford Smith

18 Oct

SYD07:00Sydney Kingsford Smith

21h 05m

2 stops

SEA10:05Seattle/Tacoma Intl

$1,228

Air Canada

11 Oct

SEA15:00Seattle/Tacoma Intl

26h 40m

2 stops

SYD11:40Sydney Kingsford Smith

18 Oct

SYD07:00Sydney Kingsford Smith

21h 05m

2 stops

SEA10:05Seattle/Tacoma Intl

$1,230

Cathay Pacific flights from Seattle to Australia

Our best Cathay Pacific deals on Seattle to Australia flight tickets

Cathay Pacific

3 Sept

SEA12:25Seattle/Tacoma Intl

27h 25m

1 stop

PER06:50Perth

16 Sept

PER08:20Perth

40h 45m

1 stop

SEA10:05Seattle/Tacoma Intl

$1,620

Cathay Pacific

26 Oct

SEA11:50Seattle/Tacoma Intl

44h 05m

1 stop

PER22:55Perth

1 Nov

PER08:30Perth

40h 15m

1 stop

SEA09:45Seattle/Tacoma Intl

$1,665

Cathay Pacific

27 Oct

SEA11:50Seattle/Tacoma Intl

28h 05m

1 stop

PER06:55Perth

1 Nov

PER00:25Perth

24h 20m

1 stop

SEA08:45Seattle/Tacoma Intl

$1,697

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 11/10

15:00-11:40

2 stops26h 40m

Sydney Kingsford Smith

Sun 18/10

10:20-10:05

1 stop17h 45m

$1,210

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/10

15:00-11:40

2 stops26h 40m

Sydney Kingsford Smith

Sun 18/10

07:00-10:05

2 stops21h 05m

$1,228

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/10

15:00-11:40

2 stops26h 40m

Sydney Kingsford Smith

Sun 18/10

07:00-10:05

2 stops21h 05m

$1,230

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 4/11

10:10-09:35

1 stop28h 25m

Sydney Kingsford Smith

Wed 11/11

11:20-14:37

1 stop22h 17m

$1,255

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 1/2

19:05-09:35

1 stop19h 30m

Sydney Kingsford Smith

Mon 15/2

11:20-14:37

1 stop22h 17m

$1,256

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

11:20-09:27

1 stop17h 07m

$1,256

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

Mon 9/11

11:20-14:37

1 stop22h 17m

$1,256

Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 18/10

19:15-08:20

1 stop19h 05m

Sydney Kingsford Smith

Wed 28/10

10:20-09:17

1 stop16h 57m

$1,256

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Sun 14/2

18:51-09:30

1 stop19h 39m

Melbourne

Mon 22/2

12:45-12:12

1 stop18h 27m

$1,532

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Wed 27/1

19:32-10:30

1 stop19h 58m

Melbourne

Tue 16/2

11:30-15:54

2 stops23h 24m

$1,545

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, February 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 $1,401. If you don’t want to visit Australia in February, then you should wait until August to fly from Seattle, when ticket prices are also cheap, with an average price of $1,446.

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 $1,574 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 $1,333 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 17% 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	$669
Fastest flight time	18h 10m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $669. The best return flight deal from Seattle to Australia found on momondo in the last 72 hours is $1,210.

The fastest flight from Seattle to Australia takes 18h 10m

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 August 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 $1,412	Free cancellation	Rating 7.4 10,146 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.