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

United Airlines, American Airlines, and Qantas Airways 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 38% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 12 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 August 2026, there are 12 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.

$528 Cheap Flights from Seattle to Australia in 2026

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.

7:20 pm - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 00m1 stop Vancouver Intl

9:20 am - 2:17 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 57m1 stop Vancouver Intl

$895Air Canada

Sun, Aug 30 - Tue, Sep 15

7:20 pm - 10:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 20m2 stops Vancouver Intl Brisbane

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

26h 12m1 stop Vancouver Intl

$910Multiple Airlines

Sun, Aug 30 - Tue, Sep 15

3:00 pm - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

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

26h 12m1 stop Vancouver Intl

$912Air Canada

Wed, Sep 16 - Wed, Sep 23

10:40 am - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 40m1 stop Vancouver Intl

9:20 am - 8:38 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 18m1 stop Vancouver Intl

$949Multiple Airlines

Sun, Aug 30 - Tue, Sep 15

5:50 am - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

32h 30m1 stop Vancouver Intl

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

26h 12m1 stop Vancouver Intl

$998Air New Zealand

Mon, Aug 31 - Tue, Sep 15

5:50 am - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

32h 30m1 stop Vancouver Intl

9:20 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$998Air New Zealand

Mon, Aug 31 - Sun, Sep 27

3:58 pm - 6:45 amSEA Seattle/Tacoma Intl-MEL Melbourne

21h 47m1 stop Los Angeles

9:45 am - 1:39 pmMEL Melbourne-SEA Seattle/Tacoma Intl

20h 54m1 stop Los Angeles

$1,018Qantas Airways

Sat, Aug 29 - Tue, Sep 15

4:30 pm - 9:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 55m1 stop Tokyo Haneda

8:55 pm - 2:25 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

34h 30m1 stop Tokyo Haneda

$1,037ANA

Mon, Aug 31 - Sun, Sep 6

10:40 am - 7:10 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 30m2 stops Vancouver Intl Tokyo Haneda

11:45 am - 8:43 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 58m2 stops Tokyo Haneda San Francisco

$1,115ANA

Sun, Aug 30 - Fri, Sep 11

5:59 pm - 10:05 amSEA Seattle/Tacoma Intl-MEL Melbourne

22h 06m2 stops San Francisco Sydney Kingsford Smith

10:45 pm - 1:05 pmMEL Melbourne-SEA Seattle/Tacoma Intl

33h 20m1 stop Los Angeles

$1,201Qantas Airways

Wed, Oct 28 - Fri, Nov 20

Cheap last minute flights

Enter your travel dates to find the best prices.

12:44 pm - 8:15 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 31m2 stops Denver Intl San Francisco

10:55 am - 9:31 pmMEL Melbourne-SEA Seattle/Tacoma Intl

27h 36m2 stops San Francisco Denver Intl

$1,040United Airlines

Sat, Aug 22 - Sat, Sep 5

9:05 am - 8:15 amSEA Seattle/Tacoma Intl-MEL Melbourne

30h 10m1 stop San Francisco

10:55 am - 6:29 pmMEL Melbourne-SEA Seattle/Tacoma Intl

24h 34m1 stop San Francisco

$1,040United Airlines

Thu, Aug 20 - Sat, Sep 5

10:40 am - 9:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 45m2 stops Vancouver Intl Tokyo Haneda

8:55 pm - 2:25 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

34h 30m1 stop Tokyo Haneda

$1,049ANA

Mon, Aug 24 - Sun, Aug 30

10:40 am - 9:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 45m2 stops Vancouver Intl Tokyo Haneda

8:55 pm - 2:25 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

34h 30m1 stop Tokyo Haneda

$1,055ANA

Mon, Aug 24 - Sun, Aug 30

3:47 pm - 6:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 08m1 stop Dallas/Fort Worth

9:10 am - 2:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 49m2 stops Los Angeles Sacramento Intl

$1,141American Airlines

Thu, Aug 20 - Sat, Aug 29

11:05 am - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 45m2 stops Salt Lake City Los Angeles

9:15 am - 4:54 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 39m2 stops Los Angeles Salt Lake City

$1,145Delta

Thu, Aug 20 - Sat, Aug 29

7:20 am - 10:35 pmSEA Seattle/Tacoma Intl-ADL Adelaide

22h 45m2 stops Honolulu Sydney Kingsford Smith

12:40 pm - 9:29 pmADL Adelaide-SEA Seattle/Tacoma Intl

25h 19m2 stops Sydney Kingsford Smith Honolulu

$1,263Multiple Airlines

Fri, Aug 21 - Sat, Sep 5

7:20 am - 10:35 pmSEA Seattle/Tacoma Intl-ADL Adelaide

22h 45m2 stops Honolulu Sydney Kingsford Smith

12:40 pm - 9:29 pmADL Adelaide-SEA Seattle/Tacoma Intl

25h 19m2 stops Sydney Kingsford Smith Honolulu

$1,264Multiple Airlines

Fri, Aug 21 - Sat, Sep 5

9:40 am - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 10m2 stops Salt Lake City Los Angeles

9:15 am - 11:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

31h 44m2 stops Los Angeles Salt Lake City

$1,438Delta

Mon, Aug 24 - Sun, Aug 30

4:25 pm - 3:00 pmSEA Seattle/Tacoma Intl-ADL Adelaide

30h 05m1 stop Doha Hamad Intl

10:00 pm - 12:45 pmADL Adelaide-SEA Seattle/Tacoma Intl

31h 15m1 stop Doha Hamad Intl

$1,471Qatar Airways

Fri, Aug 21 - Sat, Sep 5

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Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Aug 30

SEA7:20 pmSeattle/Tacoma Intl

19h 00m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 15

SYD9:20 amSydney Kingsford Smith

21h 57m

1 stop

SEA2:17 pmSeattle/Tacoma Intl

$895

Air Canada

Sep 16

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 23

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$912

Air Canada

Sep 16

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 23

SYD7:00 amSydney Kingsford Smith

24h 17m

2 stops

SEA2:17 pmSeattle/Tacoma Intl

$925

Air New Zealand flights from Seattle to Australia

Our best Air New Zealand deals on Seattle to Australia flight tickets

Air New Zealand

Aug 31

SEA5:50 amSeattle/Tacoma Intl

32h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 16

SYD9:20 amSydney Kingsford Smith

30h 27m

1 stop

SEA10:47 pmSeattle/Tacoma Intl

$998

Air New Zealand

Aug 31

SEA5:50 amSeattle/Tacoma Intl

32h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 6

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$999

Air New Zealand

Aug 31

SEA5:50 amSeattle/Tacoma Intl

32h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 25

SYD9:20 amSydney Kingsford Smith

21h 57m

1 stop

SEA2:17 pmSeattle/Tacoma Intl

$1,036

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

7:20 pm-7:20 am

1 stop19h 00m

Sydney Kingsford Smith

Tue 9/15

9:20 am-2:17 pm

1 stop21h 57m

$895

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

7:20 pm-10:40 am

2 stops22h 20m

Sydney Kingsford Smith

Tue 9/15

9:20 am-6:32 pm

1 stop26h 12m

$910

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 9/16

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 9/23

9:20 am-6:32 pm

1 stop26h 12m

$912

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

10:40 am-7:20 am

1 stop27h 40m

Sydney Kingsford Smith

Tue 9/15

9:20 am-8:38 pm

1 stop28h 18m

$949

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 8/31

5:50 am-7:20 am

1 stop32h 30m

Sydney Kingsford Smith

Tue 9/15

9:20 am-6:32 pm

1 stop26h 12m

$998

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 8/31

5:50 am-7:20 am

1 stop32h 30m

Sydney Kingsford Smith

Sun 9/27

9:20 am-10:05 am

1 stop17h 45m

$998

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Sat 8/29

3:58 pm-6:45 am

1 stop21h 47m

Melbourne

Tue 9/15

9:45 am-1:39 pm

1 stop20h 54m

$1,018

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 8/31

4:30 pm-9:25 am

1 stop23h 55m

Sydney Kingsford Smith

Sun 9/6

8:55 pm-2:25 pm

1 stop34h 30m

$1,037

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

10:40 am-7:10 pm

2 stops39h 30m

Sydney Kingsford Smith

Fri 9/11

11:45 am-8:43 pm

2 stops25h 58m

$1,115

SeattleMelbourne

SEA Seattle/Tacoma Intl - MEL Melbourne

SEAMEL

Seattle/Tacoma Intl

Wed 10/28

5:59 pm-10:05 am

2 stops22h 06m

Melbourne

Fri 11/20

10:45 pm-1:05 pm

1 stop33h 20m

$1,201

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 February is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $970. If you aren’t able to travel during the month of February, then book flights to Australia from Seattle during August instead. Flights to Australia in August, while not as cheap as those in February, still average around $1,064.

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 $1,114 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 $936 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 23% 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	$528
Fastest flight time	18h 25m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $528. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $895.

The fastest flight from Seattle to Australia takes 18h 25m

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 August 2026, there are 12 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 12,815 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,504 reviews	Search Air Canada flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,500 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,298 reviews	Search ANA flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,083 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,962 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,817 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $842	Free Cancellation	Rating 7.4 10,104 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 662 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,453 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.