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

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

What airlines fly to Australia?

Air Canada, United Airlines and Qantas Airways are the top three most popular airlines that fly to Australia from Seattle according to our data. Air Canada is the first choice among our users, with 36% 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 October 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.

$489 Cheap Flights from Seattle to Australia in 2026/27

Discover deals from 900+ travel sites with momondo.

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.

3:15 pm - 8:45 amSEA Seattle/Tacoma Intl-BNE Brisbane

23h 30m1 stop Vancouver Intl

10:45 am - 9:32 amBNE Brisbane-SEA Seattle/Tacoma Intl

16h 47m1 stop Vancouver Intl

$975Air Canada

Sat, Feb 20 - Sun, Feb 28

10:10 am - 8:45 amSEA Seattle/Tacoma Intl-BNE Brisbane

28h 35m1 stop Vancouver Intl

10:45 am - 9:57 pmBNE Brisbane-SEA Seattle/Tacoma Intl

29h 12m1 stop Vancouver Intl

$975Air Canada

Tue, Nov 10 - Wed, Nov 18

7:00 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

6:00 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 18m2 stops Brisbane Vancouver Intl

$987Multiple Airlines

Wed, Mar 24 - Wed, Apr 21

7:00 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

6:20 am - 9:15 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 55m2 stops Brisbane Vancouver Intl

$987Multiple Airlines

Mon, Mar 1 - Wed, Mar 17

3:15 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 am - 9:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$1,031Air New Zealand

Tue, Feb 9 - Mon, Feb 15

7:05 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,031Air New Zealand

Tue, Feb 9 - Tue, Feb 16

8:45 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m1 stop San Francisco

11:15 am - 1:56 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 41m2 stops Los Angeles Portland

$1,063Alaska Airlines

Fri, Feb 5 - Fri, Feb 19

3:55 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Los Angeles

11:15 am - 12:02 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 47m1 stop Los Angeles

$1,091Alaska Airlines

Thu, Dec 3 - Thu, Dec 10

1:35 pm - 9:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

24h 55m1 stop Los Angeles

10:45 pm - 11:42 pmMEL Melbourne-SEA Seattle/Tacoma Intl

19h 57m1 stop Los Angeles

$1,092Qantas Airways

Tue, Nov 10 - Tue, Nov 17

5:59 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 01m1 stop Los Angeles

11:10 am - 1:08 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 58m1 stop Los Angeles

$1,118Qantas Airways

Mon, Nov 16 - Mon, Nov 23

Cheap last minute flights

Enter your travel dates to find the best prices.

8:40 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 55m1 stop Vancouver Intl

11:20 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$977Air Canada

Tue, Oct 27 - Tue, Nov 3

8:40 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 55m1 stop Vancouver Intl

11:20 am - 9:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$977Air Canada

Tue, Oct 27 - Wed, Nov 4

3:15 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

6:20 am - 9:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 12m2 stops Brisbane Vancouver Intl

$988Multiple Airlines

Sun, Oct 25 - Sun, Nov 8

10:30 pm - 9:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 am - 7:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$992Philippine Airlines

Sun, Oct 25 - Sun, Nov 1

7:08 pm - 9:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

20h 22m1 stop Los Angeles

10:45 pm - 11:42 pmMEL Melbourne-SEA Seattle/Tacoma Intl

19h 57m1 stop Los Angeles

$1,092Qantas Airways

Sun, Oct 25 - Mon, Nov 9

7:15 am - 7:00 amSEA Seattle/Tacoma Intl-MEL Melbourne

29h 45m2 stops Salt Lake City Los Angeles

10:10 am - 3:10 pmMEL Melbourne-SEA Seattle/Tacoma Intl

24h 00m1 stop Los Angeles

$1,129Delta

Sun, Oct 25 - Mon, Nov 9

9:42 am - 7:00 amSEA Seattle/Tacoma Intl-MEL Melbourne

27h 18m2 stops Salt Lake City Los Angeles

10:10 am - 6:41 pmMEL Melbourne-SEA Seattle/Tacoma Intl

27h 31m2 stops Los Angeles Salt Lake City

$1,129Delta

Sun, Oct 25 - Mon, Nov 9

4:37 pm - 9:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

22h 53m1 stop Los Angeles

10:45 pm - 11:42 pmMEL Melbourne-SEA Seattle/Tacoma Intl

19h 57m1 stop Los Angeles

$1,213Qantas Airways

Sun, Oct 25 - Mon, Nov 9

7:35 pm - 9:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

19h 55m1 stop San Francisco

12:45 pm - 9:19 pmMEL Melbourne-SEA Seattle/Tacoma Intl

27h 34m2 stops San Francisco Denver Intl

$1,235United Airlines

Sun, Oct 25 - Mon, Nov 9

12:45 pm - 9:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 45m2 stops Denver Intl San Francisco

12:45 pm - 9:19 pmMEL Melbourne-SEA Seattle/Tacoma Intl

27h 34m2 stops San Francisco Denver Intl

$1,235United Airlines

Sun, Oct 25 - Mon, Nov 9

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Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets

Qantas Airways

Oct 25

SEA7:08 pmSeattle/Tacoma Intl

20h 22m

1 stop

MEL9:30 amMelbourne

Nov 9

MEL10:45 pmMelbourne

19h 57m

1 stop

SEA11:42 pmSeattle/Tacoma Intl

$1,092

Qantas Airways

Feb 17

SEA3:10 pmSeattle/Tacoma Intl

20h 40m

1 stop

BNE5:50 amBrisbane

Mar 3

BNE1:10 pmBrisbane

19h 32m

1 stop

SEA2:42 pmSeattle/Tacoma Intl

$1,134

Qantas Airways

Feb 21

SEA3:10 pmSeattle/Tacoma Intl

20h 40m

1 stop

BNE5:50 amBrisbane

Mar 1

BNE1:10 pmBrisbane

39h 42m

1 stop

SEA10:52 amSeattle/Tacoma Intl

$1,151

Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

Oct 25

SEA10:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Nov 1

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$992

Philippine Airlines

Mar 1

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 17

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$1,001

Philippine Airlines

Feb 21

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 10

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$1,033

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Sat 2/20

3:15 pm-8:45 am

1 stop23h 30m

Brisbane

Sun 2/28

10:45 am-9:32 am

1 stop16h 47m

$975

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Tue 11/10

10:10 am-8:45 am

1 stop28h 35m

Brisbane

Wed 11/18

10:45 am-9:57 pm

1 stop29h 12m

$975

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/24

7:00 pm-8:35 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 4/21

6:00 am-9:18 am

2 stops20h 18m

$987

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

7:00 pm-9:35 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 3/17

6:20 am-9:15 am

2 stops20h 55m

$987

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 2/9

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 2/15

11:20 am-9:32 am

1 stop17h 12m

$1,031

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 2/9

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Tue 2/16

11:20 am-2:37 pm

1 stop22h 17m

$1,031

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 2/5

8:45 am-6:25 am

1 stop26h 40m

Sydney Kingsford Smith

Fri 2/19

11:15 am-1:56 pm

2 stops21h 41m

$1,063

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 12/3

3:55 pm-6:25 am

1 stop19h 30m

Sydney Kingsford Smith

Thu 12/10

11:15 am-12:02 pm

1 stop19h 47m

$1,091

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Tue 11/10

1:35 pm-9:30 am

1 stop24h 55m

Melbourne

Tue 11/17

10:45 pm-11:42 pm

1 stop19h 57m

$1,092

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/16

5:59 pm-9:00 am

1 stop20h 01m

Sydney Kingsford Smith

Mon 11/23

11:10 am-1:08 pm

1 stop20h 58m

$1,118

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 August is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $1,045. If you aren’t able to travel during the month of August, then book flights to Australia from Seattle during February instead. Flights to Australia in February, while not as cheap as those in August, still average around $1,060.

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 $1,172 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 $983 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 14% 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

Best Price Found	$489
Fastest flight time	18h 50m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $489. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $975.

The fastest flight from Seattle to Australia takes 18h 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 are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Australia?
As of October 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
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,664 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,328 reviews	Search ANA flights
Air Canada	PriceFrom $795	Free Cancellation	Rating 7.1 11,794 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,115 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $888	Free Cancellation	Rating 7.3 10,406 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 675 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,186 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,524 reviews	Search Cathay Pacific flights
Alaska Airlines	PriceFrom $1,159	Free Cancellation	Rating 7.9 13,108 reviews	Search Alaska Airlines flights
Singapore Airlines	PriceFrom $1,232	Free Cancellation	Rating 8.2 1,627 reviews	Search Singapore Airlines 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.