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

United Airlines, Delta, 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 is 1 operator available for flights from Seattle/Tacoma Intl Airport to Australia as of May 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.

$742 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.

10:03 - 06:45

SEA

MEL

27h 42m

1 stop

09:45 - 21:39

MEL

SEA

28h 54m

1 stop

$1,394Multiple Airlines

Sat, 15 Aug - Sat, 29 Aug

06:03 - 06:45

SEA

MEL

31h 42m

1 stop

09:45 - 12:20

MEL

SEA

19h 35m

1 stop

$1,405Multiple Airlines

Sun, 9 Aug - Sun, 23 Aug

19:20 - 07:20

SEA

SYD

19h 00m

1 stop

09:20 - 14:22

SYD

SEA

22h 02m

1 stop

$1,462Air Canada

Tue, 28 Jul - Tue, 11 Aug

05:45 - 07:20

SEA

SYD

32h 35m

1 stop

09:20 - 10:07

SYD

SEA

17h 47m

1 stop

$1,464Air Canada

Sun, 5 Jul - Sun, 12 Jul

15:58 - 06:45

SEA

MEL

21h 47m

1 stop

09:45 - 12:16

MEL

SEA

20h 31m

1 stop

$1,497Qantas Airways

Fri, 25 Sep - Fri, 23 Oct

07:00 - 06:45

SEA

MEL

30h 45m

1 stop

09:45 - 17:44

MEL

SEA

24h 59m

2 stops

$1,502American Airlines

Thu, 9 Jul - Thu, 16 Jul

14:40 - 06:45

SEA

MEL

23h 05m

1 stop

09:45 - 21:45

MEL

SEA

29h 00m

1 stop

$1,513American Airlines

Tue, 7 Jul - Wed, 22 Jul

19:05 - 08:15

SEA

MEL

20h 10m

1 stop

09:30 - 21:15

MEL

SEA

28h 45m

2 stops

$1,528United Airlines

Sat, 1 Aug - Fri, 28 Aug

17:55 - 13:40

SEA

ADL

25h 15m

2 stops

19:00 - 00:04

ADL

SEA

23h 34m

2 stops

$1,759Qantas Airways

Fri, 13 Nov - Sun, 6 Dec

10:29 - 11:55

SEA

HBA

32h 26m

2 stops

06:25 - 21:15

HBA

SEA

31h 50m

3 stops

$1,931United Airlines

Mon, 3 Aug - Wed, 12 Aug

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

28 July

SEA19:20Seattle/Tacoma Intl

19h 00m

1 stop

SYD07:20Sydney Kingsford Smith

11 Aug

SYD09:20Sydney Kingsford Smith

22h 02m

1 stop

SEA14:22Seattle/Tacoma Intl

$1,462

Air Canada

5 July

SEA05:45Seattle/Tacoma Intl

32h 35m

1 stop

SYD07:20Sydney Kingsford Smith

12 July

SYD09:20Sydney Kingsford Smith

17h 47m

1 stop

SEA10:07Seattle/Tacoma Intl

$1,464

Air Canada

5 July

SEA05:45Seattle/Tacoma Intl

32h 35m

1 stop

SYD07:20Sydney Kingsford Smith

12 July

SYD09:20Sydney Kingsford Smith

17h 47m

1 stop

SEA10:07Seattle/Tacoma Intl

$1,465

American Airlines flights from Seattle to Australia

Our best American Airlines deals on Seattle to Australia flight tickets

American Airlines

30 May

SEA11:43Seattle/Tacoma Intl

24h 17m

1 stop

MEL05:00Melbourne

16 June

MEL09:45Melbourne

24h 53m

2 stops

SEA17:38Seattle/Tacoma Intl

$1,500

American Airlines

9 July

SEA07:00Seattle/Tacoma Intl

30h 45m

1 stop

MEL06:45Melbourne

16 July

MEL09:45Melbourne

24h 59m

2 stops

SEA17:44Seattle/Tacoma Intl

$1,502

American Airlines

7 July

SEA14:40Seattle/Tacoma Intl

23h 05m

1 stop

MEL06:45Melbourne

22 July

MEL09:45Melbourne

29h 00m

1 stop

SEA21:45Seattle/Tacoma Intl

$1,513

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 15/8

10:03-06:45

1 stop27h 42m

Melbourne

Sat 29/8

09:45-21:39

1 stop28h 54m

$1,394

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 9/8

06:03-06:45

1 stop31h 42m

Melbourne

Sun 23/8

09:45-12:20

1 stop19h 35m

$1,405

Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 28/7

19:20-07:20

1 stop19h 00m

Sydney Kingsford Smith

Tue 11/8

09:20-14:22

1 stop22h 02m

$1,462

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/7

05:45-07:20

1 stop32h 35m

Sydney Kingsford Smith

Sun 12/7

09:20-10:07

1 stop17h 47m

$1,464

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 25/9

15:58-06:45

1 stop21h 47m

Melbourne

Fri 23/10

09:45-12:16

1 stop20h 31m

$1,497

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Thu 9/7

07:00-06:45

1 stop30h 45m

Melbourne

Thu 16/7

09:45-17:44

2 stops24h 59m

$1,502

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 7/7

14:40-06:45

1 stop23h 05m

Melbourne

Wed 22/7

09:45-21:45

1 stop29h 00m

$1,513

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 1/8

19:05-08:15

1 stop20h 10m

Melbourne

Fri 28/8

09:30-21:15

2 stops28h 45m

$1,528

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 13/11

17:55-13:40

2 stops25h 15m

Adelaide

Sun 6/12

19:00-00:04

2 stops23h 34m

$1,759

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Mon 3/8

10:29-11:55

2 stops32h 26m

Hobart

Wed 12/8

06:25-21:15

3 stops31h 50m

$1,931

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 $136. 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 $199.

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 $1,466 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 $1,259 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 33% 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 50m
Direct flights	None

The fastest flight from Seattle to Australia takes 17h 50m

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 May 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 $1,118	Free cancellation	Rating 7.4 9,751 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.