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

Alaska Airlines, Philippine Airlines, and Qantas Airways are the most popular carriers operating from Seattle/Tacoma Intl to Australia

What airlines fly to Australia?

Air Canada, United Airlines and Qantas Airways are the top three most popular airlines that fly to Australia from Seattle according to our data. Air Canada is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 11 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 11 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.

$501 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.

3:15 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

9:20 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 58m1 stop Vancouver Intl

$978Air Canada

Wed, Mar 24 - Wed, Apr 21

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

28h 25m1 stop Vancouver Intl

10:20 am - 9:15 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 55m1 stop Vancouver Intl

$978Air Canada

Mon, Mar 1 - Wed, Mar 17

7:00 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

6:00 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 18m2 stops Brisbane Vancouver Intl

$989Multiple Airlines

Wed, Mar 24 - Wed, Apr 21

7:00 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

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

20h 55m2 stops Brisbane Vancouver Intl

$989Multiple Airlines

Mon, Mar 1 - Wed, Mar 17

9:50 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 35m1 stop Los Angeles

11:15 am - 10:52 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 37m1 stop Los Angeles

$1,065Alaska Airlines

Sat, Feb 20 - Sun, Mar 7

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

28h 25m1 stop Vancouver Intl

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

22h 17m1 stop Vancouver Intl

$1,089Air New Zealand

Mon, Feb 1 - Mon, Feb 8

5:30 pm - 5:50 amSEA Seattle/Tacoma Intl-BNE Brisbane

19h 20m1 stop Los Angeles

1:05 pm - 10:36 pmBNE Brisbane-SEA Seattle/Tacoma Intl

26h 31m1 stop Los Angeles

$1,092Alaska Airlines

Wed, Mar 24 - Wed, Apr 7

3:15 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:20 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 58m1 stop Vancouver Intl

$1,106Air New Zealand

Mon, Mar 22 - Mon, Mar 29

11:30 am - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 00m2 stops Salt Lake City Los Angeles

10:40 am - 2:43 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 03m2 stops Los Angeles Salt Lake City

$1,130Delta

Wed, Nov 25 - Wed, Dec 2

11:30 am - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 00m2 stops Salt Lake City Los Angeles

10:40 am - 3:11 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 31m1 stop Los Angeles

$1,130Delta

Mon, Nov 23 - Wed, Dec 2

Cheap last minute flights

Enter your travel dates to find the best prices.

8:45 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Portland Los Angeles

9:40 pm - 11:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 19m2 stops Honolulu Kahului

$1,059Multiple Airlines

Thu, Nov 5 - Thu, Nov 12

12:00 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 25m1 stop Los Angeles

9:40 pm - 11:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 19m2 stops Honolulu Kahului

$1,059Multiple Airlines

Thu, Nov 5 - Thu, Nov 12

11:30 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 55m1 stop Los Angeles

11:15 am - 10:58 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 43m1 stop Los Angeles

$1,093Alaska Airlines

Thu, Nov 5 - Sat, Jan 23

11:33 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 52m1 stop Los Angeles

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

21h 57m1 stop Los Angeles

$1,093Alaska Airlines

Sat, Oct 31 - Fri, Nov 6

3:15 pm - 8:45 amSEA Seattle/Tacoma Intl-BNE Brisbane

24h 30m1 stop Vancouver Intl

10:45 am - 6:22 pmBNE Brisbane-SEA Seattle/Tacoma Intl

25h 37m1 stop Vancouver Intl

$1,108Air Canada

Sat, Oct 31 - Wed, Nov 4

12:20 pm - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 45m1 stop Los Angeles

11:50 am - 2:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 36m1 stop San Francisco

$1,162United Airlines

Mon, Nov 2 - Wed, Jan 13

8:30 am - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 35m2 stops Denver Intl Los Angeles

11:50 am - 2:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 36m1 stop San Francisco

$1,166United Airlines

Mon, Nov 2 - Wed, Jan 13

3:15 pm - 8:45 amSEA Seattle/Tacoma Intl-BNE Brisbane

24h 30m1 stop Vancouver Intl

10:45 am - 6:22 pmBNE Brisbane-SEA Seattle/Tacoma Intl

25h 37m1 stop Vancouver Intl

$1,201Air Canada

Sat, Oct 31 - Wed, Nov 4

6:00 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 35m2 stops Los Angeles Auckland Intl

9:55 am - 9:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

31h 04m2 stops Auckland Intl Los Angeles

$1,233Air New Zealand

Mon, Nov 2 - Wed, Jan 13

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

27h 25m2 stops Vancouver Intl Auckland Intl

9:55 am - 9:57 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

31h 02m2 stops Auckland Intl Vancouver Intl

$5,026Air New Zealand

Thu, Nov 5 - Sun, Nov 15

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Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

Mar 1

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 17

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$992

Philippine Airlines

Nov 9

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Nov 18

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$1,071

Philippine Airlines

Mar 21

SEA10:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Apr 1

SYD11:35 amSydney Kingsford Smith

26h 00m

1 stop

SEA7:35 pmSeattle/Tacoma Intl

$1,083

Alaska Airlines flights from Seattle to Australia

Our best Alaska Airlines deals on Seattle to Australia flight tickets

Alaska Airlines

Feb 1

SEA4:39 pmSeattle/Tacoma Intl

21h 51m

1 stop

MEL9:30 amMelbourne

Feb 12

MEL10:45 pmMelbourne

29h 06m

1 stop

SEA8:51 amSeattle/Tacoma Intl

$1,055

Alaska Airlines

Jan 31

SEA8:51 pmSeattle/Tacoma Intl

41h 39m

1 stop

MEL9:30 amMelbourne

Feb 12

MEL10:45 pmMelbourne

29h 06m

1 stop

SEA8:51 amSeattle/Tacoma Intl

$1,064

Alaska Airlines

Feb 20

SEA9:50 amSeattle/Tacoma Intl

25h 35m

1 stop

SYD6:25 amSydney Kingsford Smith

Mar 7

SYD11:15 amSydney Kingsford Smith

18h 37m

1 stop

SEA10:52 amSeattle/Tacoma Intl

$1,065

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/24

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 4/21

9:20 am-9:18 am

1 stop16h 58m

$978

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Wed 3/17

10:20 am-9:15 am

1 stop16h 55m

$978

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/24

7:00 pm-8:35 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 4/21

6:00 am-9:18 am

2 stops20h 18m

$989

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

7:00 pm-9:35 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 3/17

6:20 am-9:15 am

2 stops20h 55m

$989

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 2/20

9:50 am-6:25 am

1 stop25h 35m

Sydney Kingsford Smith

Sun 3/7

11:15 am-10:52 am

1 stop18h 37m

$1,065

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/1

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Mon 2/8

11:20 am-2:37 pm

1 stop22h 17m

$1,089

SeattleBrisbane

SEA Seattle/Tacoma Intl - BNE Brisbane

SEABNE

Seattle/Tacoma Intl

Wed 3/24

5:30 pm-5:50 am

1 stop19h 20m

Brisbane

Wed 4/7

1:05 pm-10:36 pm

1 stop26h 31m

$1,092

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/22

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 3/29

10:20 am-9:18 am

1 stop16h 58m

$1,106

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/25

11:30 am-8:30 am

2 stops26h 00m

Sydney Kingsford Smith

Wed 12/2

10:40 am-2:43 pm

2 stops23h 03m

$1,130

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/23

11:30 am-8:30 am

2 stops26h 00m

Sydney Kingsford Smith

Wed 12/2

10:40 am-3:11 pm

1 stop23h 31m

$1,130

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 $1,060. If you aren’t able to travel during the month of February, then book flights to Australia from Seattle during May instead. Flights to Australia in May, while not as cheap as those in February, still average around $1,100.

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 $1,190 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 $983 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 14% 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	$501
Fastest flight time	18h 31m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $501. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $978.

The fastest flight from Seattle to Australia takes 18h 31m

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 11 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
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,689 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,337 reviews	Search ANA flights
Air Canada	PriceFrom $796	Free Cancellation	Rating 7.1 11,830 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,121 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $888	Free Cancellation	Rating 7.3 10,449 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 676 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,209 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,533 reviews	Search Cathay Pacific flights
Alaska Airlines	PriceFrom $1,159	Free Cancellation	Rating 7.9 13,134 reviews	Search Alaska Airlines flights
Singapore Airlines	PriceFrom $1,232	Free Cancellation	Rating 8.2 1,630 reviews	Search Singapore Airlines 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.