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

Cathay Pacific, Air Canada, and United 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 are 2 operators available for flights from Seattle/Tacoma Intl Airport to Australia as of February 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.

$557 Cheap Flights from Seattle to Australia in 2026

1 adult

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Find the cheapest flights from Seattle to Australia

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

16:30 - 19:15

SEA

SYD

33h 45m

1 stop

20:55 - 14:25

SYD

SEA

34h 30m

1 stop

$1,070ANA

Mon, 1 Jun - Sun, 14 Jun

15:40 - 07:45

SEA

BNE

23h 05m

1 stop

10:00 - 18:30

BNE

SEA

25h 30m

1 stop

$1,133Air Canada

Tue, 10 Mar - Sun, 10 May

15:40 - 07:45

SEA

BNE

23h 05m

1 stop

10:00 - 18:30

BNE

SEA

25h 30m

1 stop

$1,139Air Canada

Tue, 10 Mar - Sun, 10 May

18:40 - 07:05

SEA

SYD

19h 25m

1 stop

09:10 - 18:07

SYD

SEA

25h 57m

1 stop

$1,268American Airlines

Sun, 19 Apr - Mon, 11 May

14:57 - 07:05

SEA

SYD

23h 08m

2 stops

09:10 - 18:07

SYD

SEA

25h 57m

1 stop

$1,275American Airlines

Sun, 19 Apr - Mon, 11 May

17:20 - 06:55

SEA

SYD

20h 35m

1 stop

09:30 - 17:59

SYD

SEA

25h 29m

2 stops

$1,282United Airlines

Mon, 1 Jun - Mon, 29 Jun

10:29 - 06:55

SEA

SYD

27h 26m

1 stop

09:30 - 17:59

SYD

SEA

25h 29m

2 stops

$1,283United Airlines

Mon, 1 Jun - Mon, 29 Jun

18:55 - 06:50

SEA

SYD

18h 55m

1 stop

09:15 - 12:58

SYD

SEA

20h 43m

1 stop

$1,295Delta

Sun, 2 Aug - Tue, 18 Aug

06:00 - 12:25

SEA

MEL

37h 25m

2 stops

13:30 - 20:05

MEL

SEA

23h 35m

2 stops

$1,326Multiple Airlines

Sun, 9 Aug - Sat, 5 Sep

17:50 - 09:30

SEA

MEL

21h 40m

1 stop

12:00 - 15:42

MEL

SEA

21h 42m

1 stop

$1,449Multiple Airlines

Tue, 10 Mar - Tue, 24 Mar

United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets

United Airlines

19 Apr

SEA07:12Seattle/Tacoma Intl

30h 43m

1 stop

SYD06:55Sydney Kingsford Smith

4 May

SYD10:20Sydney Kingsford Smith

17h 23m

1 stop

SEA10:43Seattle/Tacoma Intl

$1,282

United Airlines

1 June

SEA10:29Seattle/Tacoma Intl

27h 26m

1 stop

SYD06:55Sydney Kingsford Smith

29 June

SYD09:30Sydney Kingsford Smith

25h 29m

2 stops

SEA17:59Seattle/Tacoma Intl

$1,283

United Airlines

11 May

SEA19:36Seattle/Tacoma Intl

18h 19m

1 stop

SYD06:55Sydney Kingsford Smith

25 May

SYD10:20Sydney Kingsford Smith

19h 14m

1 stop

SEA12:34Seattle/Tacoma Intl

$1,288

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

3 Aug

SEA18:55Seattle/Tacoma Intl

18h 55m

1 stop

SYD06:50Sydney Kingsford Smith

16 Aug

SYD09:15Sydney Kingsford Smith

22h 28m

1 stop

SEA14:43Seattle/Tacoma Intl

$1,295

Delta

7 Apr

SEA05:30Seattle/Tacoma Intl

32h 20m

2 stops

SYD06:50Sydney Kingsford Smith

21 Apr

SYD09:15Sydney Kingsford Smith

20h 10m

2 stops

SEA12:25Seattle/Tacoma Intl

$1,300

Delta

1 Aug

SEA21:25Seattle/Tacoma Intl

40h 25m

1 stop

SYD06:50Sydney Kingsford Smith

18 Aug

SYD09:15Sydney Kingsford Smith

24h 40m

1 stop

SEA16:55Seattle/Tacoma Intl

$1,305

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/6

16:30-19:15

1 stop33h 45m

Sydney Kingsford Smith

Sun 14/6

20:55-14:25

1 stop34h 30m

$1,070

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 10/3

15:40-07:45

1 stop23h 05m

Brisbane

Sun 10/5

10:00-18:30

1 stop25h 30m

$1,133

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 10/3

15:40-07:45

1 stop23h 05m

Brisbane

Sun 10/5

10:00-18:30

1 stop25h 30m

$1,139

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/4

18:40-07:05

1 stop19h 25m

Sydney Kingsford Smith

Mon 11/5

09:10-18:07

1 stop25h 57m

$1,268

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/4

14:57-07:05

2 stops23h 08m

Sydney Kingsford Smith

Mon 11/5

09:10-18:07

1 stop25h 57m

$1,275

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/6

17:20-06:55

1 stop20h 35m

Sydney Kingsford Smith

Mon 29/6

09:30-17:59

2 stops25h 29m

$1,282

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/6

10:29-06:55

1 stop27h 26m

Sydney Kingsford Smith

Mon 29/6

09:30-17:59

2 stops25h 29m

$1,283

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/8

18:55-06:50

1 stop18h 55m

Sydney Kingsford Smith

Tue 18/8

09:15-12:58

1 stop20h 43m

$1,295

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 9/8

06:00-12:25

2 stops37h 25m

Melbourne

Sat 5/9

13:30-20:05

2 stops23h 35m

$1,326

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 10/3

17:50-09:30

1 stop21h 40m

Melbourne

Tue 24/3

12:00-15:42

1 stop21h 42m

$1,449

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 $1,197. 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 $1,201.

How far in advance should I book a flight 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 $1,510 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 $1,241 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 4% 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	18h 19m
Direct flights	None

The fastest flight from Seattle to Australia takes 18h 19m

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

Search flight deals

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 February 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 $612	Free cancellation	Rating 7.1 10,745 reviews		Search Air Canada flights
United Airlines	PriceFrom $1,132	Free cancellation	Rating 7.4 9,345 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.