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

United Airlines, Delta, and Cathay Pacific 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 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.

$531 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.

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

$897Air Canada

Sun, Aug 30 - Sun, Sep 13

10:50 am - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

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

21h 57m1 stop Vancouver Intl

$933Air Canada

Mon, Sep 14 - Tue, Sep 22

11:06 am - 12:35 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 29m2 stops Los Angeles Nadi

2:00 pm - 6:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 26m2 stops Nadi Los Angeles

$939Multiple Airlines

Sun, Oct 25 - Wed, Nov 4

3:31 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 04m1 stop Vancouver Intl

11:20 am - 9:57 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

29h 37m1 stop Vancouver Intl

$949Multiple Airlines

Sun, Oct 25 - Mon, Nov 16

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

23h 55m1 stop Tokyo Haneda

8:55 pm - 11:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

43h 31m2 stops Tokyo Haneda San Francisco

$968ANA

Mon, Aug 24 - Sun, Aug 30

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

$999Air New Zealand

Sun, Aug 30 - Mon, Sep 14

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

$999Air New Zealand

Sun, Aug 30 - Sun, Sep 13

4:30 pm - 7:10 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

33h 40m1 stop Tokyo Haneda

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

34h 30m1 stop Tokyo Haneda

$1,025ANA

Mon, Aug 24 - Sun, Aug 30

6:30 am - 7:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 30m1 stop Los Angeles

9:30 am - 7:14 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 44m1 stop Los Angeles

$1,031United Airlines

Sun, Aug 23 - Wed, Sep 2

6:30 am - 7:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 30m1 stop Los Angeles

10:20 am - 8:43 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

27h 23m1 stop San Francisco

$1,031United Airlines

Sun, Aug 23 - Sun, Aug 30

Cheap last minute flights

Enter your travel dates to find the best prices.

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

32h 30m1 stop Vancouver Intl

9:20 am - 10:47 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

30h 27m1 stop Vancouver Intl

$939Air Canada

Sun, Aug 16 - Tue, Sep 8

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

19h 00m1 stop Vancouver Intl

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

26h 12m1 stop Vancouver Intl

$939Air Canada

Wed, Aug 19 - Wed, Aug 26

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

23h 20m1 stop Vancouver Intl

6:00 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 05m2 stops Brisbane Vancouver Intl

$959Multiple Airlines

Wed, Aug 19 - Wed, Aug 26

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

27h 40m1 stop Vancouver Intl

8:15 pm - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

30h 50m2 stops Brisbane Vancouver Intl

$966Multiple Airlines

Sun, Aug 16 - Sat, Aug 22

11:40 am - 6:45 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 05m1 stop Los Angeles

9:45 am - 7:57 pmMEL Melbourne-SEA Seattle/Tacoma Intl

27h 12m2 stops Los Angeles Dallas/Fort Worth

$1,013American Airlines

Sat, Aug 15 - Sat, Aug 29

11:40 am - 6:45 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 05m1 stop Los Angeles

9:45 am - 4:52 pmMEL Melbourne-SEA Seattle/Tacoma Intl

24h 07m1 stop Los Angeles

$1,013American Airlines

Sat, Aug 15 - Sat, Aug 29

5:20 pm - 6:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 35m1 stop San Francisco

10:20 am - 12:20 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 00m1 stop San Francisco

$1,031United Airlines

Wed, Aug 19 - Sun, Aug 30

7:35 pm - 6:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

18h 20m1 stop San Francisco

9:30 am - 7:14 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 44m1 stop Los Angeles

$1,031United Airlines

Wed, Aug 19 - Wed, Sep 2

5:50 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 00m1 stop Los Angeles

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

24h 39m2 stops Los Angeles Salt Lake City

$1,031Delta

Wed, Aug 19 - Sun, Aug 30

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

28h 10m2 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

$1,045Delta

Mon, Aug 17 - Mon, Aug 24

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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

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 13

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$897

Air Canada

Sep 14

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 22

SYD9:20 amSydney Kingsford Smith

21h 57m

1 stop

SEA2:17 pmSeattle/Tacoma Intl

$933

Air Canada

Sep 14

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 21

SYD7:00 amSydney Kingsford Smith

24h 17m

2 stops

SEA2:17 pmSeattle/Tacoma Intl

$936

Air New Zealand flights from Seattle to Australia

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

Air New Zealand

Aug 30

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 14

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$999

Air New Zealand

Aug 30

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 13

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,000

Air New Zealand

Aug 15

SEA10:40 amSeattle/Tacoma Intl

27h 40m

1 stop

SYD7:20 amSydney Kingsford Smith

Aug 19

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,036

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 9/13

9:20 am-6:32 pm

1 stop26h 12m

$897

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/14

10:50 am-7:20 am

1 stop27h 30m

Sydney Kingsford Smith

Tue 9/22

9:20 am-2:17 pm

1 stop21h 57m

$933

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/25

11:06 am-12:35 pm

2 stops31h 29m

Sydney Kingsford Smith

Wed 11/4

2:00 pm-6:26 pm

2 stops23h 26m

$939

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/25

3:31 pm-8:35 am

1 stop23h 04m

Sydney Kingsford Smith

Mon 11/16

11:20 am-9:57 pm

1 stop29h 37m

$949

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 8/24

4:30 pm-9:25 am

1 stop23h 55m

Sydney Kingsford Smith

Sun 8/30

8:55 pm-11:26 pm

2 stops43h 31m

$968

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 9/14

9:20 am-6:32 pm

1 stop26h 12m

$999

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/30

3:00 pm-7:20 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 9/13

9:20 am-6:32 pm

1 stop26h 12m

$999

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 8/24

4:30 pm-7:10 pm

1 stop33h 40m

Sydney Kingsford Smith

Sun 8/30

8:55 pm-2:25 pm

1 stop34h 30m

$1,025

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/23

6:30 am-7:00 am

1 stop31h 30m

Sydney Kingsford Smith

Wed 9/2

9:30 am-7:14 pm

1 stop26h 44m

$1,031

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 8/23

6:30 am-7:00 am

1 stop31h 30m

Sydney Kingsford Smith

Sun 8/30

10:20 am-8:43 pm

1 stop27h 23m

$1,031

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 $968. 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 $1,066.

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 $1,108 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 $927 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 21% 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	19h 30m
Direct flights	None

The fastest flight from Seattle to Australia takes 19h 30m

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 12,809 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,471 reviews	Search Air Canada flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,502 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,297 reviews	Search ANA flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,081 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,929 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,817 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $841	Free Cancellation	Rating 7.4 10,108 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 1,451 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.