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

Qantas Airways, United Airlines, and American Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Australia

What airlines fly to Australia?

United Airlines, Air Canada and Qantas Airways are the top three most popular airlines that fly to Australia from Seattle according to our data. United Airlines is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 11 different airlines that fly to Australia on a routine basis, so you have a few additional options to choose from.

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 are refreshed on a daily basis.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Australia?

As of June 2026, there are 11 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Australia.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Australia?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. 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 travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$530 Cheap Flights from Seattle to Australia in 2026

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Find the cheapest flights from Seattle to Australia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:00 pm - 7:20 am

SEA

SYD

23h 20m

1 stop

9:20 am - 10:07 am

SYD

SEA

17h 47m

1 stop

$1,026Air Canada

Sun, Jun 21 - Tue, Jul 7

6:36 pm - 10:15 am

SEA

MEL

22h 39m

2 stops

9:45 am - 12:48 pm

MEL

SEA

20h 03m

1 stop

$1,034Multiple Airlines

Tue, Aug 11 - Tue, Aug 18

3:00 pm - 7:20 am

SEA

SYD

23h 20m

1 stop

9:20 am - 6:32 pm

SYD

SEA

26h 12m

1 stop

$1,035Air Canada

Sun, Jun 21 - Tue, Jul 7

3:58 pm - 6:45 am

SEA

MEL

21h 47m

1 stop

9:45 am - 12:16 pm

MEL

SEA

20h 31m

1 stop

$1,070Qantas Airways

Fri, Sep 25 - Fri, Oct 23

12:55 pm - 6:45 am

SEA

MEL

24h 50m

1 stop

1:35 pm - 7:48 pm

MEL

SEA

23h 13m

1 stop

$1,081American Airlines

Fri, Sep 18 - Sat, Sep 26

7:00 am - 6:45 am

SEA

MEL

30h 45m

1 stop

9:45 am - 9:45 pm

MEL

SEA

29h 00m

1 stop

$1,082American Airlines

Fri, Jul 3 - Sat, Jul 11

3:30 pm - 9:15 am

SEA

MEL

23h 45m

1 stop

1:00 pm - 12:12 pm

MEL

SEA

18h 12m

1 stop

$1,092United Airlines

Wed, Oct 21 - Sun, Nov 15

9:02 am - 10:00 am

SEA

MEL

29h 58m

1 stop

11:30 am - 7:08 pm

MEL

SEA

26h 38m

1 stop

$1,093United Airlines

Sun, Nov 29 - Sat, Dec 12

3:20 pm - 5:00 am

SEA

BNE

20h 40m

1 stop

1:10 pm - 8:57 am

BNE

SEA

36h 47m

1 stop

$1,126Qantas Airways

Mon, Oct 12 - Mon, Oct 26

8:45 am - 5:20 pm

SEA

CNS

38h 35m

1 stop

6:20 pm - 7:10 am

CNS

SEA

54h 50m

1 stop

$1,888Singapore Airlines

Wed, Nov 18 - Wed, Dec 2

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets

Qantas Airways

Sep 25

SEA3:58 pmSeattle/Tacoma Intl

21h 47m

1 stop

MEL6:45 amMelbourne

Oct 23

MEL9:45 amMelbourne

20h 31m

1 stop

SEA12:16 pmSeattle/Tacoma Intl

$1,070

Qantas Airways

Jul 28

SEA6:10 pmSeattle/Tacoma Intl

20h 20m

1 stop

SYD7:30 amSydney Kingsford Smith

Aug 11

SYD5:50 pmSydney Kingsford Smith

22h 31m

1 stop

SEA11:21 pmSeattle/Tacoma Intl

$1,105

Qantas Airways

Oct 12

SEA3:20 pmSeattle/Tacoma Intl

20h 40m

1 stop

BNE5:00 amBrisbane

Oct 26

BNE1:10 pmBrisbane

36h 47m

1 stop

SEA8:57 amSeattle/Tacoma Intl

$1,126

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Jun 21

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Jul 7

SYD9:20 amSydney Kingsford Smith

17h 47m

1 stop

SEA10:07 amSeattle/Tacoma Intl

$1,026

Air Canada

Jun 21

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Jul 7

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,035

Air Canada

Jun 21

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Jul 7

SYD9:20 amSydney Kingsford Smith

17h 47m

1 stop

SEA10:07 amSeattle/Tacoma Intl

$1,040

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 6/21

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 7/7

9:20 am-10:07 am

1 stop17h 47m

$1,026

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 8/11

6:36 pm-10:15 am

2 stops22h 39m

Melbourne

Tue 8/18

9:45 am-12:48 pm

1 stop20h 03m

$1,034

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 6/21

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 7/7

9:20 am-6:32 pm

1 stop26h 12m

$1,035

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 9/25

3:58 pm-6:45 am

1 stop21h 47m

Melbourne

Fri 10/23

9:45 am-12:16 pm

1 stop20h 31m

$1,070

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 9/18

12:55 pm-6:45 am

1 stop24h 50m

Melbourne

Sat 9/26

1:35 pm-7:48 pm

1 stop23h 13m

$1,081

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 7/3

7:00 am-6:45 am

1 stop30h 45m

Melbourne

Sat 7/11

9:45 am-9:45 pm

1 stop29h 00m

$1,082

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 10/21

3:30 pm-9:15 am

1 stop23h 45m

Melbourne

Sun 11/15

1:00 pm-12:12 pm

1 stop18h 12m

$1,092

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 11/29

9:02 am-10:00 am

1 stop29h 58m

Melbourne

Sat 12/12

11:30 am-7:08 pm

1 stop26h 38m

$1,093

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 10/12

3:20 pm-5:00 am

1 stop20h 40m

Brisbane

Mon 10/26

1:10 pm-8:57 am

1 stop36h 47m

$1,126

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Wed 11/18

8:45 am-5:20 pm

1 stop38h 35m

Cairns

Wed 12/2

6:20 pm-7:10 am

1 stop54h 50m

$1,888

Flights are sorted by cheapest round-trip 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?

The month of January is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $97. If you aren’t able to travel during the month of January, then book flights to Australia from Seattle during February instead. Flights to Australia in February, while not as cheap as those in January, still average around $142.

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 $1,050 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Seattle for as low as $923 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 27% 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 are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Australia?
As of June 2026, there are 11 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Australia.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Australia?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. 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 travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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
Alaska Airlines	PriceFrom $97	Free Cancellation	Rating 7.9 12,464 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,125 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,220 reviews	Search ANA flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 1,042 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,640 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,831 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $832	Free Cancellation	Rating 7.4 9,772 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,399 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 645 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,357 reviews	Search Cathay Pacific flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Australia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Australia. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Australia with flexible booking policies on momondo?

All flight searches from Seattle to Australia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Australia?

momondo helps you find the best flight between Seattle and Australia by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to Australia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Australia, momondo offers a useful price alert feature which will track prices for flights to Australia from Seattle and alert you when they change.