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

Qantas Airways, United Airlines, and Delta 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 September 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.

$459 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.

10:50 am - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

11:20 am - 7:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$834Air Canada

Sun, Oct 18 - Sun, Nov 1

10:50 am - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

11:20 am - 7:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$835Air Canada

Sun, Oct 18 - Sun, Nov 1

7:15 pm - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 05m1 stop Vancouver Intl

8:00 am - 10:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 32m2 stops Brisbane Vancouver Intl

$847Multiple Airlines

Sun, Oct 18 - Sun, Nov 1

7:15 pm - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 05m1 stop Vancouver Intl

8:00 am - 10:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 32m2 stops Brisbane Vancouver Intl

$849Multiple Airlines

Sun, Oct 18 - Sun, Nov 1

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

$974Air New Zealand

Sun, Feb 7 - Tue, Feb 23

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

19h 30m1 stop Vancouver Intl

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

17h 12m1 stop Vancouver Intl

$974Air New Zealand

Mon, Feb 8 - Sun, Feb 21

3:30 pm - 6:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 50m1 stop San Francisco

9:15 am - 10:38 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

32h 23m1 stop Houston George Bush Intcntl

$1,053United Airlines

Wed, Feb 3 - Mon, Feb 22

9:02 am - 6:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 18m1 stop San Francisco

9:15 am - 12:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 30m1 stop Houston George Bush Intcntl

$1,053United Airlines

Wed, Feb 3 - Wed, Feb 17

5:55 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 55m1 stop Los Angeles

10:40 am - 1:00 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 20m1 stop Los Angeles

$1,053Delta

Sat, Feb 6 - Tue, Feb 23

2:30 pm - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 00m1 stop Los Angeles

10:40 am - 1:00 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 20m1 stop Los Angeles

$1,053Delta

Mon, Feb 8 - Tue, Feb 23

Cheap last minute flights

Enter your travel dates to find the best prices.

11:10 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 50m1 stop Manila Ninoy Aquino Intl

10:15 am - 8:05 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 50m1 stop Manila Ninoy Aquino Intl

$1,103Philippine Airlines

Sun, Sep 20 - Wed, Sep 30

11:10 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 50m1 stop Manila Ninoy Aquino Intl

10:15 am - 8:05 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 50m1 stop Manila Ninoy Aquino Intl

$1,103Philippine Airlines

Sun, Sep 20 - Tue, Sep 29

7:15 pm - 11:30 amSEA Seattle/Tacoma Intl-BNE Brisbane

23h 15m2 stops Vancouver Intl Sydney Kingsford Smith

10:00 am - 10:05 amBNE Brisbane-SEA Seattle/Tacoma Intl

17h 05m1 stop Vancouver Intl

$1,162Air Canada

Sun, Sep 20 - Sun, Sep 27

10:50 am - 7:05 amSEA Seattle/Tacoma Intl-BNE Brisbane

27h 15m1 stop Vancouver Intl

10:00 am - 6:32 pmBNE Brisbane-SEA Seattle/Tacoma Intl

25h 32m1 stop Vancouver Intl

$1,261Air Canada

Sun, Sep 20 - Sun, Sep 27

11:45 am - 5:55 amSEA Seattle/Tacoma Intl-MEL Melbourne

25h 10m1 stop Hong Kong Intl

2:25 pm - 10:05 amMEL Melbourne-SEA Seattle/Tacoma Intl

36h 40m1 stop Hong Kong Intl

$1,307Cathay Pacific

Mon, Sep 21 - Mon, Sep 28

7:10 pm - 10:15 pmSEA Seattle/Tacoma Intl-MEL Melbourne

34h 05m2 stops Los Angeles Hong Kong Intl

8:25 am - 10:05 amMEL Melbourne-SEA Seattle/Tacoma Intl

43h 40m1 stop Hong Kong Intl

$1,411Cathay Pacific

Sun, Sep 20 - Mon, Oct 19

12:35 pm - 7:50 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 15m1 stop Los Angeles

11:00 am - 9:58 pmMEL Melbourne-SEA Seattle/Tacoma Intl

28h 58m1 stop Los Angeles

$1,431Delta

Fri, Sep 25 - Fri, Oct 23

12:35 pm - 7:50 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 15m1 stop Los Angeles

11:00 am - 9:58 pmMEL Melbourne-SEA Seattle/Tacoma Intl

28h 58m1 stop Los Angeles

$1,432Delta

Fri, Sep 25 - Fri, Oct 23

6:49 am - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 41m1 stop Los Angeles

5:50 pm - 10:39 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 49m2 stops Los Angeles Portland

$1,598Alaska Airlines

Sun, Sep 20 - Tue, Sep 22

4:25 pm - 5:30 pmSEA Seattle/Tacoma Intl-BNE Brisbane

32h 05m1 stop Doha Hamad Intl

10:10 pm - 7:07 pmBNE Brisbane-SEA Seattle/Tacoma Intl

37h 57m2 stops Doha Hamad Intl San Francisco

$1,890Qatar Airways

Wed, Sep 23 - Fri, Sep 25

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Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Oct 18

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD8:20 amSydney Kingsford Smith

Nov 1

SYD11:20 amSydney Kingsford Smith

26h 02m

1 stop

SEA7:22 pmSeattle/Tacoma Intl

$834

Air Canada

Oct 18

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD8:20 amSydney Kingsford Smith

Nov 1

SYD11:20 amSydney Kingsford Smith

26h 02m

1 stop

SEA7:22 pmSeattle/Tacoma Intl

$835

Air Canada

Oct 21

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 26

SYD10:20 amSydney Kingsford Smith

17h 07m

1 stop

SEA9:27 amSeattle/Tacoma Intl

$842

Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

Sep 20

SEA11:10 pmSeattle/Tacoma Intl

39h 50m

1 stop

SYD8:00 amSydney Kingsford Smith

Sep 30

SYD10:15 amSydney Kingsford Smith

26h 50m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,103

Philippine Airlines

Sep 25

SEA11:10 pmSeattle/Tacoma Intl

41h 05m

1 stop

PER7:15 amPerth

Oct 8

PER8:35 amPerth

26h 30m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,204

Philippine Airlines

Sep 22

SEA11:10 pmSeattle/Tacoma Intl

39h 50m

1 stop

SYD8:00 amSydney Kingsford Smith

Sep 29

SYD10:15 amSydney Kingsford Smith

26h 50m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,329

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 10/18

10:50 am-8:20 am

1 stop27h 30m

Sydney Kingsford Smith

Sun 11/1

11:20 am-7:22 pm

1 stop26h 02m

$834

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

10:50 am-8:20 am

1 stop27h 30m

Sydney Kingsford Smith

Sun 11/1

11:20 am-7:22 pm

1 stop26h 02m

$835

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

7:15 pm-8:20 am

1 stop19h 05m

Sydney Kingsford Smith

Sun 11/1

8:00 am-10:32 am

2 stops20h 32m

$847

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

7:15 pm-8:20 am

1 stop19h 05m

Sydney Kingsford Smith

Sun 11/1

8:00 am-10:32 am

2 stops20h 32m

$849

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 2/7

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 2/23

11:20 am-9:32 am

1 stop17h 12m

$974

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/8

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Sun 2/21

11:20 am-9:32 am

1 stop17h 12m

$974

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/3

3:30 pm-6:20 am

1 stop19h 50m

Sydney Kingsford Smith

Mon 2/22

9:15 am-10:38 pm

1 stop32h 23m

$1,053

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/3

9:02 am-6:20 am

1 stop26h 18m

Sydney Kingsford Smith

Wed 2/17

9:15 am-12:45 pm

1 stop22h 30m

$1,053

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 2/6

5:55 pm-6:50 am

1 stop41h 55m

Sydney Kingsford Smith

Tue 2/23

10:40 am-1:00 pm

1 stop21h 20m

$1,053

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/8

2:30 pm-8:30 am

1 stop23h 00m

Sydney Kingsford Smith

Tue 2/23

10:40 am-1:00 pm

1 stop21h 20m

$1,053

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 $1,034. 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 $1,045.

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 $1,158 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 $1,010 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 9% 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	$459
Fastest flight time	18h 30m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $459. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $834.

The fastest flight from Seattle to Australia takes 18h 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 September 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 12,950 reviews	Search Alaska Airlines flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,590 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,315 reviews	Search ANA flights
Air Canada	PriceFrom $796	Free Cancellation	Rating 7.1 11,652 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $805	Free Cancellation	Rating 7.5 1,102 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $822	Free Cancellation	Rating 7.8 2,811 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $845	Free Cancellation	Rating 7.4 10,230 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 669 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,085 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,489 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.