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

Qantas Airways, American Airlines, and United 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 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 October 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.

$486 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.

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

28h 25m1 stop Vancouver Intl

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

17h 12m1 stop Vancouver Intl

$965Air Canada

Mon, Nov 9 - Sun, Nov 15

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

23h 20m1 stop Vancouver Intl

9:00 am - 9:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 32m2 stops Brisbane Vancouver Intl

$979Air Canada

Mon, Nov 9 - Sun, Nov 15

5:40 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

44h 55m2 stops Edmonton Vancouver Intl

11:20 am - 7:58 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

39h 38m2 stops Vancouver Intl Edmonton

$996Multiple Airlines

Tue, Feb 2 - Tue, Feb 16

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

41h 20m1 stop Manila Ninoy Aquino Intl

11:35 am - 7:35 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 00m1 stop Manila Ninoy Aquino Intl

$1,006Philippine Airlines

Thu, Mar 18 - Wed, Apr 21

4:37 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 28m1 stop Los Angeles

11:15 am - 2:12 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 57m1 stop Los Angeles

$1,020Qantas Airways

Mon, Oct 19 - Mon, Nov 2

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

20h 01m1 stop Los Angeles

11:10 am - 1:00 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 50m1 stop Los Angeles

$1,071Qantas Airways

Tue, Nov 3 - Tue, Nov 10

1:37 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 28m1 stop Los Angeles

11:15 am - 1:00 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 45m1 stop Los Angeles

$1,089American Airlines

Mon, Oct 19 - Mon, Nov 2

7:10 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 15m1 stop Los Angeles

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

20h 23m1 stop Los Angeles

$1,093American Airlines

Wed, Jan 20 - Wed, Feb 3

2:30 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 20m1 stop Los Angeles

10:40 am - 10:35 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 55m1 stop Los Angeles

$1,097Delta

Tue, Jan 26 - Wed, Feb 17

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

23h 00m1 stop Los Angeles

1:35 pm - 2:47 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 12m1 stop Los Angeles

$1,097Delta

Sun, Jan 24 - Tue, Feb 16

Cheap last minute flights

Enter your travel dates to find the best prices.

1:37 pm - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 53m1 stop Los Angeles

11:10 am - 3:54 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 44m1 stop Los Angeles

$1,243American Airlines

Sun, Oct 11 - Wed, Nov 4

10:05 am - 6:50 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

38h 45m1 stop Honolulu

8:45 pm - 11:32 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 47m1 stop Honolulu

$1,289Multiple Airlines

Thu, Oct 15 - Thu, Oct 22

11:45 am - 6:55 amSEA Seattle/Tacoma Intl-MEL Melbourne

25h 10m1 stop Hong Kong Intl

3:30 pm - 9:45 amMEL Melbourne-SEA Seattle/Tacoma Intl

36h 15m1 stop Hong Kong Intl

$1,300Cathay Pacific

Mon, Oct 12 - Mon, Oct 26

3:20 pm - 8:45 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

35h 25m2 stops Los Angeles Hong Kong Intl

3:05 pm - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

37h 00m1 stop Hong Kong Intl

$1,315Multiple Airlines

Thu, Oct 15 - Wed, Oct 21

2:30 pm - 7:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Los Angeles

10:15 am - 12:40 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 25m1 stop Los Angeles

$1,367Delta

Thu, Oct 15 - Wed, Oct 21

11:05 am - 7:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 45m2 stops Salt Lake City Los Angeles

10:15 am - 7:02 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 47m2 stops Los Angeles Salt Lake City

$1,371Delta

Thu, Oct 15 - Wed, Oct 21

7:08 pm - 11:15 pmSEA Seattle/Tacoma Intl-MEL Melbourne

34h 07m2 stops Los Angeles Hong Kong Intl

12:45 am - 4:26 pmMEL Melbourne-SEA Seattle/Tacoma Intl

33h 41m2 stops Hong Kong Intl Vancouver Intl

$1,420Cathay Pacific

Mon, Oct 12 - Sun, Oct 25

9:05 am - 7:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 50m1 stop San Francisco

11:50 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 32m2 stops Auckland Intl Vancouver Intl

$1,509Air New Zealand

Sun, Oct 11 - Wed, Nov 4

4:37 pm - 10:30 amSEA Seattle/Tacoma Intl-BNE Brisbane

24h 53m2 stops Los Angeles Sydney Kingsford Smith

5:00 am - 1:07 pmBNE Brisbane-SEA Seattle/Tacoma Intl

25h 07m2 stops Sydney Kingsford Smith Los Angeles

$1,551American Airlines

Sun, Oct 11 - Sun, Oct 18

12:16 pm - 8:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

26h 14m1 stop Los Angeles

12:45 pm - 12:20 pmMEL Melbourne-SEA Seattle/Tacoma Intl

18h 35m1 stop San Francisco

$1,644United Airlines

Mon, Oct 12 - Thu, Nov 5

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

Mar 17

SEA10:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 25

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$1,006

Philippine Airlines

Mar 19

SEA10:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 28

SYD11:30 amSydney Kingsford Smith

26h 05m

1 stop

SEA7:35 pmSeattle/Tacoma Intl

$1,035

Philippine Airlines

Nov 23

SEA9:30 pmSeattle/Tacoma Intl

41h 50m

1 stop

PER7:20 amPerth

Nov 30

PER8:35 amPerth

26h 10m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$1,114

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Nov 9

SEA10:10 amSeattle/Tacoma Intl

28h 25m

1 stop

SYD9:35 amSydney Kingsford Smith

Nov 15

SYD11:20 amSydney Kingsford Smith

17h 12m

1 stop

SEA9:32 amSeattle/Tacoma Intl

$965

Air Canada

Nov 9

SEA3:15 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD9:35 amSydney Kingsford Smith

Nov 15

SYD9:00 amSydney Kingsford Smith

19h 32m

2 stops

SEA9:32 amSeattle/Tacoma Intl

$979

Air Canada

Nov 9

SEA3:15 pmSeattle/Tacoma Intl

28h 25m

2 stops

SYD2:40 pmSydney Kingsford Smith

Nov 15

SYD8:30 amSydney Kingsford Smith

20h 02m

2 stops

SEA9:32 amSeattle/Tacoma Intl

$998

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/9

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Sun 11/15

11:20 am-9:32 am

1 stop17h 12m

$965

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/9

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 11/15

9:00 am-9:32 am

2 stops19h 32m

$979

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 2/2

5:40 pm-9:35 am

2 stops44h 55m

Sydney Kingsford Smith

Tue 2/16

11:20 am-7:58 am

2 stops39h 38m

$996

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 3/18

10:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Wed 4/21

11:35 am-7:35 pm

1 stop25h 00m

$1,006

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 10/19

4:37 pm-8:05 am

1 stop21h 28m

Sydney Kingsford Smith

Mon 11/2

11:15 am-2:12 pm

1 stop21h 57m

$1,020

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 11/3

5:59 pm-9:00 am

1 stop20h 01m

Sydney Kingsford Smith

Tue 11/10

11:10 am-1:00 pm

1 stop20h 50m

$1,071

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 10/19

1:37 pm-8:05 am

1 stop24h 28m

Sydney Kingsford Smith

Mon 11/2

11:15 am-1:00 pm

1 stop20h 45m

$1,089

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 1/20

7:10 am-6:25 am

1 stop28h 15m

Sydney Kingsford Smith

Wed 2/3

11:20 am-12:43 pm

1 stop20h 23m

$1,093

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 1/26

2:30 pm-6:50 am

1 stop21h 20m

Sydney Kingsford Smith

Wed 2/17

10:40 am-10:35 am

1 stop18h 55m

$1,097

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 1/24

2:30 pm-8:30 am

1 stop23h 00m

Sydney Kingsford Smith

Tue 2/16

1:35 pm-2:47 pm

1 stop20h 12m

$1,097

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 $1,053.

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 $1,170 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 $1,021 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 7% 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	$486
Fastest flight time	17h 45m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $486. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $965.

The fastest flight from Seattle to Australia takes 17h 45m

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 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 13,039 reviews	Search Alaska Airlines flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,652 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,321 reviews	Search ANA flights
Air Canada	PriceFrom $796	Free Cancellation	Rating 7.1 11,748 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,106 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $822	Free Cancellation	Rating 7.8 2,806 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $888	Free Cancellation	Rating 7.4 10,330 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 671 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,149 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,511 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.