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 39% 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.

$73 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.

10:10 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Vancouver Intl

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

26h 02m1 stop Vancouver Intl

$899Air Canada

Sun, Oct 25 - 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

$900Air Canada

Sun, Oct 18 - Sun, Nov 1

10:10 am - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Vancouver Intl

11:20 am - 2:41 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 21m1 stop Vancouver Intl

$911Multiple Airlines

Thu, Nov 19 - Mon, Feb 1

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

23h 20m1 stop Vancouver Intl

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

20h 55m2 stops Brisbane Vancouver Intl

$912Multiple Airlines

Mon, Mar 1 - Wed, Mar 17

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

$980Air New Zealand

Mon, Feb 15 - Mon, Feb 22

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

$980Air New Zealand

Wed, Feb 17 - Wed, Feb 24

12:54 pm - 6:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 41m1 stop Las Vegas Harry Reid Intl

11:20 am - 12:43 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 23m1 stop Los Angeles

$1,052Qantas Airways

Tue, Jan 26 - Tue, Feb 9

3:59 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 26m1 stop San Francisco

9:25 pm - 9:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 01m1 stop San Francisco

$1,069Qantas Airways

Wed, Jan 27 - Wed, Feb 10

1:16 pm - 9:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 04m1 stop San Francisco

1:20 pm - 6:28 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 08m1 stop San Francisco

$1,081United Airlines

Wed, Nov 18 - Tue, Dec 15

7:35 pm - 9:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

18h 45m1 stop San Francisco

1:20 pm - 12:18 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 58m1 stop San Francisco

$1,081United Airlines

Sun, Nov 15 - Tue, Dec 15

Cheap last minute flights

Enter your travel dates to find the best prices.

12:25 pm - 10:15 pmSEA Seattle/Tacoma Intl-MEL Melbourne

40h 50m1 stop Hong Kong Intl

7:25 am - 10:05 amMEL Melbourne-SEA Seattle/Tacoma Intl

43h 40m1 stop Hong Kong Intl

$1,265Cathay Pacific

Tue, Sep 15 - Tue, Sep 29

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

$1,288Philippine Airlines

Wed, Sep 16 - Tue, Sep 22

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

$1,288Philippine Airlines

Wed, Sep 16 - Tue, Sep 29

11:45 am - 10:30 pmSEA Seattle/Tacoma Intl-BNE Brisbane

41h 45m1 stop Hong Kong Intl

12:20 pm - 10:05 amBNE Brisbane-SEA Seattle/Tacoma Intl

38h 45m1 stop Hong Kong Intl

$1,309Cathay Pacific

Thu, Sep 17 - Wed, Sep 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

$1,325Air Canada

Wed, Sep 16 - Sun, Sep 27

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

27h 30m1 stop Vancouver Intl

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

17h 45m1 stop Vancouver Intl

$1,325Air Canada

Sun, Sep 20 - Sun, Sep 27

9:00 am - 8:45 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

30h 45m2 stops San Francisco Auckland Intl

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

41h 12m2 stops Auckland Intl Vancouver Intl

$1,513Air New Zealand

Sun, Sep 20 - Sat, Oct 3

9:00 am - 8:45 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

30h 45m2 stops San Francisco Auckland Intl

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

41h 12m2 stops Auckland Intl Vancouver Intl

$1,514Air New Zealand

Sun, Sep 20 - Sat, Oct 3

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

30h 05m1 stop Doha Hamad Intl

10:00 pm - 12:25 pmADL Adelaide-SEA Seattle/Tacoma Intl

31h 55m1 stop Doha Hamad Intl

$1,709Qatar Airways

Wed, Sep 16 - Sun, Oct 11

3:25 pm - 8:15 amSEA Seattle/Tacoma Intl-MEL Melbourne

23h 50m1 stop San Francisco

11:55 am - 12:18 pmMEL Melbourne-SEA Seattle/Tacoma Intl

42h 23m1 stop San Francisco

$2,187United Airlines

Sun, Sep 20 - Mon, Oct 19

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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 19

SEA7:15 pmSeattle/Tacoma Intl

19h 05m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 31

SYD10:20 amSydney Kingsford Smith

26h 02m

1 stop

SEA6:22 pmSeattle/Tacoma Intl

$880

Air Canada

Oct 19

SEA3:00 pmSeattle/Tacoma Intl

26h 40m

2 stops

SYD11:40 amSydney Kingsford Smith

Oct 31

SYD10:20 amSydney Kingsford Smith

17h 07m

1 stop

SEA9:27 amSeattle/Tacoma Intl

$899

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

$900

Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

Sep 27

SEA11:10 pmSeattle/Tacoma Intl

39h 50m

1 stop

SYD8:00 amSydney Kingsford Smith

Oct 20

SYD11:15 amSydney Kingsford Smith

26h 50m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,104

Philippine Airlines

Sep 27

SEA11:10 pmSeattle/Tacoma Intl

39h 50m

1 stop

SYD8:00 amSydney Kingsford Smith

Oct 13

SYD11:15 amSydney Kingsford Smith

26h 50m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,105

Philippine Airlines

Sep 16

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

$1,288

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 10/25

10:10 am-8:35 am

1 stop28h 25m

Sydney Kingsford Smith

Sun 11/1

11:20 am-7:22 pm

1 stop26h 02m

$899

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

$900

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 11/19

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Mon 2/1

11:20 am-2:41 pm

1 stop22h 21m

$911

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 3/17

6:20 am-9:15 am

2 stops20h 55m

$912

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/15

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Mon 2/22

11:20 am-9:32 am

1 stop17h 12m

$980

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/17

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 2/24

11:20 am-9:32 am

1 stop17h 12m

$980

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 1/26

12:54 pm-6:35 am

1 stop22h 41m

Sydney Kingsford Smith

Tue 2/9

11:20 am-12:43 pm

1 stop20h 23m

$1,052

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 1/27

3:59 pm-6:25 am

1 stop19h 26m

Sydney Kingsford Smith

Wed 2/10

9:25 pm-9:26 pm

1 stop19h 01m

$1,069

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/18

1:16 pm-9:20 am

1 stop25h 04m

Sydney Kingsford Smith

Tue 12/15

1:20 pm-6:28 pm

1 stop24h 08m

$1,081

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/15

7:35 pm-9:20 am

1 stop18h 45m

Sydney Kingsford Smith

Tue 12/15

1:20 pm-12:18 pm

1 stop17h 58m

$1,081

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 $1,020. 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 $1,146 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 $948 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 25% 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	$73
Fastest flight time	18h 30m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $73. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $899.

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 12,926 reviews	Search Alaska Airlines flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,564 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,315 reviews	Search ANA flights
Air Canada	PriceFrom $781	Free Cancellation	Rating 7.1 11,621 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,093 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $821	Free Cancellation	Rating 7.8 2,812 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $843	Free Cancellation	Rating 7.4 10,214 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 7.1 12,051 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,486 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.