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

Delta, United Airlines, and Qantas Airways 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 are 2 operators available for flights from Seattle/Tacoma Intl Airport to Australia as of July 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.

$683 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.

10:40 - 09:25

SEA

SYD

29h 45m

2 stops

11:45 - 18:32

SYD

SEA

23h 47m

2 stops

$1,386Multiple Airlines

Tue, 25 Aug - Wed, 16 Sep

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

11:45 - 18:32

SYD

SEA

23h 47m

2 stops

$1,387Multiple Airlines

Tue, 4 Aug - Tue, 18 Aug

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

11:45 - 18:32

SYD

SEA

23h 47m

2 stops

$1,390ANA

Sun, 2 Aug - Wed, 19 Aug

14:20 - 07:30

SEA

SYD

24h 10m

1 stop

09:10 - 16:40

SYD

SEA

24h 30m

2 stops

$1,392American Airlines

Mon, 3 Aug - Sun, 16 Aug

07:00 - 07:30

SEA

SYD

31h 30m

1 stop

09:10 - 11:10

SYD

SEA

19h 00m

1 stop

$1,396American Airlines

Mon, 3 Aug - Sun, 16 Aug

16:30 - 19:10

SEA

SYD

33h 40m

1 stop

11:45 - 18:32

SYD

SEA

23h 47m

2 stops

$1,403ANA

Mon, 10 Aug - Mon, 17 Aug

15:00 - 07:05

SEA

BNE

23h 05m

1 stop

10:00 - 22:42

BNE

SEA

29h 42m

1 stop

$1,584Air Canada

Sun, 9 Aug - Sun, 23 Aug

05:50 - 07:05

SEA

BNE

32h 15m

1 stop

10:00 - 18:32

BNE

SEA

25h 32m

1 stop

$1,643Air Canada

Sun, 2 Aug - Sun, 16 Aug

19:35 - 06:30

SEA

BNE

17h 55m

1 stop

11:40 - 19:31

BNE

SEA

24h 51m

1 stop

$1,650United Airlines

Wed, 28 Oct - Sun, 1 Nov

10:29 - 11:10

SEA

ADL

32h 11m

2 stops

06:05 - 21:15

ADL

SEA

31h 40m

3 stops

$1,679United Airlines

Sun, 2 Aug - Sun, 16 Aug

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United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets

United Airlines

9 Aug

SEA17:04Seattle/Tacoma Intl

20h 56m

1 stop

SYD07:00Sydney Kingsford Smith

16 Aug

SYD09:30Sydney Kingsford Smith

19h 04m

1 stop

SEA11:34Seattle/Tacoma Intl

$1,412

United Airlines

28 July

SEA15:33Seattle/Tacoma Intl

22h 22m

1 stop

SYD06:55Sydney Kingsford Smith

11 Aug

SYD09:30Sydney Kingsford Smith

29h 01m

2 stops

SEA21:31Seattle/Tacoma Intl

$1,413

United Airlines

28 July

SEA12:50Seattle/Tacoma Intl

25h 10m

2 stops

SYD07:00Sydney Kingsford Smith

11 Aug

SYD10:20Sydney Kingsford Smith

24h 22m

2 stops

SEA17:42Seattle/Tacoma Intl

$1,419

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

27 Sept

SEA10:50Seattle/Tacoma Intl

27h 30m

1 stop

SYD07:20Sydney Kingsford Smith

12 Oct

SYD08:00Sydney Kingsford Smith

19h 52m

2 stops

SEA09:52Seattle/Tacoma Intl

$1,499

Air Canada

7 Oct

SEA15:00Seattle/Tacoma Intl

23h 20m

1 stop

SYD08:20Sydney Kingsford Smith

20 Oct

SYD10:20Sydney Kingsford Smith

30h 22m

1 stop

SEA22:42Seattle/Tacoma Intl

$1,507

Air Canada

28 July

SEA10:45Seattle/Tacoma Intl

27h 35m

1 stop

SYD07:20Sydney Kingsford Smith

31 Aug

SYD07:00Sydney Kingsford Smith

28h 32m

2 stops

SEA18:32Seattle/Tacoma Intl

$1,529

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 25/8

10:40-09:25

2 stops29h 45m

Sydney Kingsford Smith

Wed 16/9

11:45-18:32

2 stops23h 47m

$1,386

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Tue 18/8

11:45-18:32

2 stops23h 47m

$1,387

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Wed 19/8

11:45-18:32

2 stops23h 47m

$1,390

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/8

14:20-07:30

1 stop24h 10m

Sydney Kingsford Smith

Sun 16/8

09:10-16:40

2 stops24h 30m

$1,392

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/8

07:00-07:30

1 stop31h 30m

Sydney Kingsford Smith

Sun 16/8

09:10-11:10

1 stop19h 00m

$1,396

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 10/8

16:30-19:10

1 stop33h 40m

Sydney Kingsford Smith

Mon 17/8

11:45-18:32

2 stops23h 47m

$1,403

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 9/8

15:00-07:05

1 stop23h 05m

Brisbane

Sun 23/8

10:00-22:42

1 stop29h 42m

$1,584

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 2/8

05:50-07:05

1 stop32h 15m

Brisbane

Sun 16/8

10:00-18:32

1 stop25h 32m

$1,643

Fastest return journey

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 28/10

19:35-06:30

1 stop17h 55m

Brisbane

Sun 1/11

11:40-19:31

1 stop24h 51m

$1,650

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 2/8

10:29-11:10

2 stops32h 11m

Adelaide

Sun 16/8

06:05-21:15

3 stops31h 40m

$1,679

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, January 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 $139. If you don’t want to visit Australia in January, then you should wait until February to fly from Seattle, when ticket prices are also cheap, with an average price of $203.

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 $1,547 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 $1,337 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 19% 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

Fastest flight time	17h 45m
Direct flights	None

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 are 2 operators available for flights from Seattle/Tacoma Intl Airport to Australia as of July 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
Air Canada	PriceFrom $617	Free cancellation	Rating 7.1 11,347 reviews		Search Air Canada flights
United Airlines	PriceFrom $1,141	Free cancellation	Rating 7.4 9,993 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.