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

United Airlines, Delta, and Philippine 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 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.

$402 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 - 11:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

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

17h 45m1 stop Vancouver Intl

$867Air Canada

Sun, Oct 11 - Sun, Oct 18

3:00 pm - 11:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

7:00 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 05m2 stops Brisbane Vancouver Intl

$880Air Canada

Sun, Oct 11 - Sun, Oct 18

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

28h 25m1 stop Vancouver Intl

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

22h 12m2 stops Brisbane Vancouver Intl

$911Multiple Airlines

Mon, Nov 16 - Sun, Nov 22

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

19h 05m1 stop Vancouver Intl

6:20 am - 9:17 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 57m2 stops Brisbane Vancouver Intl

$911Multiple Airlines

Sun, Oct 18 - Wed, Oct 28

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

19h 30m1 stop Vancouver Intl

11:20 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,000Air New Zealand

Tue, Feb 2 - Tue, Feb 16

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

23h 20m1 stop Vancouver Intl

11:20 am - 9:27 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 07m1 stop Vancouver Intl

$1,000Air New Zealand

Tue, Feb 2 - Wed, Feb 17

5:02 pm - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 28m1 stop Los Angeles

10:10 am - 12:16 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 06m1 stop Los Angeles

$1,076Qantas Airways

Tue, Sep 29 - Tue, Oct 6

4:59 pm - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 31m1 stop Los Angeles

10:10 am - 12:16 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 06m1 stop Los Angeles

$1,076Qantas Airways

Wed, Sep 23 - Wed, Oct 7

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

19h 50m1 stop San Francisco

11:50 am - 12:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 32m1 stop San Francisco

$1,081United Airlines

Wed, Dec 9 - Wed, Dec 23

12:23 pm - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 42m1 stop Los Angeles

11:50 am - 6:27 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 37m1 stop San Francisco

$1,092United Airlines

Tue, Dec 1 - Wed, Dec 16

Cheap last minute 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 - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$980Air Canada

Mon, Aug 31 - Sun, Sep 6

5:50 am - 7:05 amSEA Seattle/Tacoma Intl-BNE Brisbane

32h 15m1 stop Vancouver Intl

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

17h 05m1 stop Vancouver Intl

$993Air Canada

Mon, Aug 31 - Tue, Sep 29

4:58 pm - 7:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 02m1 stop Los Angeles

10:20 am - 2:24 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 04m1 stop San Francisco

$1,031United Airlines

Mon, Aug 31 - Wed, Sep 16

1:22 pm - 6:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 33m1 stop San Francisco

9:30 am - 9:15 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 45m2 stops Los Angeles Denver Intl

$1,031United Airlines

Mon, Aug 31 - Wed, Sep 16

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

$1,039ANA

Mon, Aug 31 - Sun, Sep 6

7:20 am - 11:25 pmSEA Seattle/Tacoma Intl-BNE Brisbane

23h 05m2 stops Honolulu Sydney Kingsford Smith

4:35 pm - 9:29 pmBNE Brisbane-SEA Seattle/Tacoma Intl

21h 54m2 stops Sydney Kingsford Smith Honolulu

$1,132Multiple Airlines

Mon, Aug 31 - Tue, Sep 29

7:20 am - 6:50 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

18h 30m1 stop Honolulu

8:45 pm - 6:11 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 26m1 stop Honolulu

$1,138Multiple Airlines

Mon, Aug 31 - Fri, Sep 4

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

40h 50m1 stop Hong Kong Intl

11:45 pm - 10:05 amMEL Melbourne-SEA Seattle/Tacoma Intl

27h 20m1 stop Hong Kong Intl

$1,253Cathay Pacific

Tue, Sep 1 - Sun, Sep 20

12:25 pm - 6:50 amSEA Seattle/Tacoma Intl-PER Perth

27h 25m1 stop Hong Kong Intl

12:10 am - 10:05 amPER Perth-SEA Seattle/Tacoma Intl

24h 55m1 stop Hong Kong Intl

$1,281Cathay Pacific

Thu, Sep 3 - Fri, Oct 2

5:20 pm - 7:10 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

32h 50m2 stops San Francisco Tokyo Haneda

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

25h 58m2 stops Tokyo Haneda San Francisco

$7,971ANA

Mon, Aug 31 - Sun, Sep 6

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

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Oct 11

SEA3:00 pmSeattle/Tacoma Intl

26h 40m

2 stops

SYD11:40 amSydney Kingsford Smith

Oct 18

SYD10:20 amSydney Kingsford Smith

17h 45m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$867

Air Canada

Oct 11

SEA3:00 pmSeattle/Tacoma Intl

26h 40m

2 stops

SYD11:40 amSydney Kingsford Smith

Oct 18

SYD7:00 amSydney Kingsford Smith

21h 05m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$880

Air Canada

Oct 11

SEA3:00 pmSeattle/Tacoma Intl

26h 40m

2 stops

SYD11:40 amSydney Kingsford Smith

Oct 18

SYD7:00 amSydney Kingsford Smith

21h 05m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$881

United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets

United Airlines

Aug 31

SEA4:58 pmSeattle/Tacoma Intl

21h 02m

1 stop

SYD7:00 amSydney Kingsford Smith

Sep 16

SYD10:20 amSydney Kingsford Smith

21h 04m

1 stop

SEA2:24 pmSeattle/Tacoma Intl

$1,031

United Airlines

Aug 31

SEA6:30 amSeattle/Tacoma Intl

31h 30m

1 stop

SYD7:00 amSydney Kingsford Smith

Sep 16

SYD9:30 amSydney Kingsford Smith

28h 45m

2 stops

SEA9:15 pmSeattle/Tacoma Intl

$1,033

United Airlines

Feb 14

SEA6:51 pmSeattle/Tacoma Intl

19h 39m

1 stop

MEL9:30 amMelbourne

Feb 22

MEL12:45 pmMelbourne

18h 27m

1 stop

SEA12:12 pmSeattle/Tacoma Intl

$1,098

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 10/11

3:00 pm-11:40 am

2 stops26h 40m

Sydney Kingsford Smith

Sun 10/18

10:20 am-10:05 am

1 stop17h 45m

$867

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/11

3:00 pm-11:40 am

2 stops26h 40m

Sydney Kingsford Smith

Sun 10/18

7:00 am-10:05 am

2 stops21h 05m

$880

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/16

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Sun 11/22

6:20 am-9:32 am

2 stops22h 12m

$911

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

Wed 10/28

6:20 am-9:17 am

2 stops20h 57m

$911

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 2/2

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Tue 2/16

11:20 am-2:37 pm

1 stop22h 17m

$1,000

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 2/2

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 2/17

11:20 am-9:27 am

1 stop17h 07m

$1,000

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 9/29

5:02 pm-7:30 am

1 stop21h 28m

Sydney Kingsford Smith

Tue 10/6

10:10 am-12:16 pm

1 stop20h 06m

$1,076

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 9/23

4:59 pm-7:30 am

1 stop21h 31m

Sydney Kingsford Smith

Wed 10/7

10:10 am-12:16 pm

1 stop20h 06m

$1,076

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 12/9

3:30 pm-6:20 am

1 stop19h 50m

Sydney Kingsford Smith

Wed 12/23

11:50 am-12:22 pm

1 stop19h 32m

$1,081

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 12/1

12:23 pm-9:05 am

1 stop25h 42m

Sydney Kingsford Smith

Wed 12/16

11:50 am-6:27 pm

1 stop25h 37m

$1,092

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 $1,004. 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 $1,036.

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 $1,128 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 $955 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	$402
Fastest flight time	18h 10m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $402. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $867.

The fastest flight from Seattle to Australia takes 18h 10m

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 12,864 reviews	Search Alaska Airlines flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,540 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,306 reviews	Search ANA flights
Air Canada	PriceFrom $780	Free Cancellation	Rating 7.1 11,557 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,087 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,816 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $843	Free Cancellation	Rating 7.4 10,140 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 665 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $976	Free Cancellation	Rating 7.1 12,019 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,466 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.