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

Air Canada, Alaska Airlines, 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 April 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.

$619 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.

18:40 - 07:30

SEA

SYD

19h 50m

1 stop

09:10 - 18:07

SYD

SEA

25h 57m

1 stop

$1,378American Airlines

Sun, 3 May - Sun, 17 May

14:40 - 07:05

SEA

SYD

23h 25m

1 stop

17:50 - 21:49

SYD

SEA

20h 59m

1 stop

$1,380American Airlines

Mon, 1 Jun - Mon, 29 Jun

17:59 - 06:50

SEA

SYD

19h 51m

1 stop

09:15 - 20:28

SYD

SEA

28h 13m

1 stop

$1,386Delta

Wed, 29 Apr - Wed, 3 Jun

15:00 - 06:50

SEA

SYD

22h 50m

1 stop

09:15 - 10:55

SYD

SEA

18h 40m

1 stop

$1,389Delta

Mon, 11 May - Mon, 25 May

19:20 - 11:20

SEA

MEL

23h 00m

2 stops

06:00 - 14:23

MEL

SEA

25h 23m

2 stops

$1,444Multiple Airlines

Wed, 3 Jun - Wed, 17 Jun

15:00 - 14:10

SEA

AVV

30h 10m

2 stops

20:40 - 10:07

AVV

SEA

30h 27m

2 stops

$1,468Multiple Airlines

Thu, 11 Jun - Tue, 7 Jul

05:45 - 07:05

SEA

BNE

32h 20m

1 stop

10:00 - 09:52

BNE

SEA

16h 52m

1 stop

$1,608Air Canada

Wed, 2 Sep - Wed, 9 Sep

10:45 - 07:05

SEA

BNE

27h 20m

1 stop

10:00 - 18:32

BNE

SEA

25h 32m

1 stop

$1,632Air Canada

Sat, 1 Aug - Wed, 12 Aug

15:33 - 12:25

SEA

OOL

27h 52m

2 stops

06:00 - 21:10

OOL

SEA

32h 10m

3 stops

$1,921United Airlines

Wed, 27 May - Wed, 3 Jun

08:30 - 10:40

SEA

OOL

33h 10m

2 stops

07:05 - 14:30

OOL

SEA

24h 25m

2 stops

$1,931United Airlines

Tue, 26 May - Tue, 2 Jun

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

29 Apr

SEA17:59Seattle/Tacoma Intl

19h 51m

1 stop

SYD06:50Sydney Kingsford Smith

3 June

SYD09:15Sydney Kingsford Smith

28h 13m

1 stop

SEA20:28Seattle/Tacoma Intl

$1,386

Delta

11 May

SEA15:00Seattle/Tacoma Intl

22h 50m

1 stop

SYD06:50Sydney Kingsford Smith

27 May

SYD09:15Sydney Kingsford Smith

24h 38m

1 stop

SEA16:53Seattle/Tacoma Intl

$1,389

Delta

29 Apr

SEA09:50Seattle/Tacoma Intl

28h 00m

2 stops

SYD06:50Sydney Kingsford Smith

3 June

SYD09:15Sydney Kingsford Smith

18h 40m

1 stop

SEA10:55Seattle/Tacoma Intl

$1,393

American Airlines flights from Seattle to Australia

Our best American Airlines deals on Seattle to Australia flight tickets

American Airlines

3 May

SEA18:40Seattle/Tacoma Intl

19h 50m

1 stop

SYD07:30Sydney Kingsford Smith

17 May

SYD09:10Sydney Kingsford Smith

25h 57m

1 stop

SEA18:07Seattle/Tacoma Intl

$1,378

American Airlines

2 Aug

SEA14:20Seattle/Tacoma Intl

24h 10m

1 stop

SYD07:30Sydney Kingsford Smith

19 Aug

SYD09:10Sydney Kingsford Smith

20h 05m

1 stop

SEA12:15Seattle/Tacoma Intl

$1,380

American Airlines

1 June

SEA14:40Seattle/Tacoma Intl

23h 25m

1 stop

SYD07:05Sydney Kingsford Smith

29 June

SYD09:10Sydney Kingsford Smith

21h 47m

1 stop

SEA13:57Seattle/Tacoma Intl

$1,382

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 3/5

18:40-07:30

1 stop19h 50m

Sydney Kingsford Smith

Sun 17/5

09:10-18:07

1 stop25h 57m

$1,378

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 1/6

14:40-07:05

1 stop23h 25m

Sydney Kingsford Smith

Mon 29/6

17:50-21:49

1 stop20h 59m

$1,380

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 29/4

17:59-06:50

1 stop19h 51m

Sydney Kingsford Smith

Wed 3/6

09:15-20:28

1 stop28h 13m

$1,386

Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 11/5

15:00-06:50

1 stop22h 50m

Sydney Kingsford Smith

Mon 25/5

09:15-10:55

1 stop18h 40m

$1,389

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 3/6

19:20-11:20

2 stops23h 00m

Melbourne

Wed 17/6

06:00-14:23

2 stops25h 23m

$1,444

SeattleMelbourne

SEA - AVV

SEAAVV

Seattle/Tacoma Intl

Thu 11/6

15:00-14:10

2 stops30h 10m

Melbourne Avalon

Tue 7/7

20:40-10:07

2 stops30h 27m

$1,468

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 2/9

05:45-07:05

1 stop32h 20m

Brisbane

Wed 9/9

10:00-09:52

1 stop16h 52m

$1,608

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 1/8

10:45-07:05

1 stop27h 20m

Brisbane

Wed 12/8

10:00-18:32

1 stop25h 32m

$1,632

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Wed 27/5

15:33-12:25

2 stops27h 52m

Coolangatta Gold Coast

Wed 3/6

06:00-21:10

3 stops32h 10m

$1,921

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Tue 26/5

08:30-10:40

2 stops33h 10m

Coolangatta Gold Coast

Tue 2/6

07:05-14:30

2 stops24h 25m

$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, 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 $1,151. 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 $1,195.

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 $1,492 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 $1,274 on momondo.

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 10m
Direct flights	None

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 are 2 operators available for flights from Seattle/Tacoma Intl Airport to Australia as of April 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 10,916 reviews		Search Air Canada flights
United Airlines	PriceFrom $1,131	Free cancellation	Rating 7.4 9,579 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.