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

Qantas Airways, American Airlines, and Delta 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.

$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.

3:15 pm - 2:40 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m2 stops Vancouver Intl Brisbane

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

17h 12m1 stop Vancouver Intl

$980Air Canada

Mon, Nov 9 - Tue, Nov 17

3:15 pm - 2:40 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m2 stops Vancouver Intl Brisbane

8:30 am - 9:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 02m2 stops Brisbane Vancouver Intl

$994Air Canada

Mon, Nov 9 - Tue, Nov 17

11:55 pm - 9:45 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 50m1 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, Apr 8 - Thu, Apr 22

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

$1,013Multiple Airlines

Sun, Nov 8 - Sun, Nov 15

4:59 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 01m1 stop Los Angeles

11:10 am - 2:12 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 02m1 stop Los Angeles

$1,051Qantas Airways

Sun, Nov 1 - Wed, Nov 18

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

23h 20m1 stop Vancouver Intl

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

16h 55m1 stop Vancouver Intl

$1,057Air New Zealand

Sun, Mar 21 - Wed, Mar 24

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

19h 35m1 stop Vancouver Intl

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

16h 58m1 stop Vancouver Intl

$1,057Air New Zealand

Wed, Mar 17 - Sun, Mar 28

3:46 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 14m1 stop Los Angeles

11:10 am - 9:00 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

40h 50m1 stop Los Angeles

$1,077Qantas Airways

Tue, Nov 24 - Tue, Dec 1

10:21 am - 6:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 59m1 stop San Francisco

1:20 pm - 3:54 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 34m1 stop San Francisco

$1,087United Airlines

Mon, Feb 1 - Tue, Mar 16

5:28 pm - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 37m1 stop Los Angeles

11:50 am - 10:21 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 31m1 stop San Francisco

$1,087United Airlines

Sun, Jan 31 - Wed, Mar 10

Cheap last minute flights

Enter your travel dates to find the best prices.

5:04 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 01m1 stop Los Angeles

11:15 am - 10:57 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 42m1 stop Los Angeles

$1,066Qantas Airways

Mon, Oct 19 - Mon, Nov 2

3:18 pm - 7:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 37m1 stop San Francisco

11:50 am - 4:27 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 37m1 stop San Francisco

$1,078Lufthansa

Mon, Oct 19 - Mon, Nov 2

5:04 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 01m1 stop Los Angeles

11:10 am - 8:09 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

27h 59m2 stops Los Angeles Phoenix Sky Harbor Intl

$1,080Multiple Airlines

Mon, Oct 19 - Mon, Nov 2

3:20 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 45m1 stop Los Angeles

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

20h 50m1 stop Los Angeles

$1,091Qantas Airways

Mon, Oct 19 - Mon, Nov 2

12:16 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 44m1 stop Los Angeles

11:20 am - 9:17 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 57m2 stops Los Angeles Denver Intl

$1,097United Airlines

Sun, Oct 18 - Mon, Jan 18

6:43 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 17m1 stop Los Angeles

11:20 am - 9:17 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 57m2 stops Los Angeles Denver Intl

$1,097United Airlines

Mon, Oct 19 - Mon, Jan 18

5:45 pm - 7:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 05m1 stop Los Angeles

10:40 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 57m1 stop Los Angeles

$1,097Delta

Sun, Oct 18 - Mon, Jan 18

3:10 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 55m2 stops Phoenix Sky Harbor Intl Los Angeles

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

20h 45m1 stop Los Angeles

$1,098American Airlines

Mon, Oct 19 - Mon, Nov 2

3:10 pm - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 55m2 stops Phoenix Sky Harbor Intl Los Angeles

1:05 pm - 4:48 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 43m1 stop Dallas/Fort Worth

$1,098American Airlines

Mon, Oct 19 - Mon, Oct 26

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

26h 45m2 stops Salt Lake City Los Angeles

9:40 am - 4:55 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

25h 15m2 stops Los Angeles Salt Lake City

$1,102Delta

Mon, Oct 19 - Mon, Oct 26

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Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets

Philippine Airlines

Apr 8

SEA11:55 pmSeattle/Tacoma Intl

40h 50m

1 stop

SYD9:45 amSydney Kingsford Smith

Apr 22

SYD11:35 amSydney Kingsford Smith

25h 00m

1 stop

SEA7:35 pmSeattle/Tacoma Intl

$1,006

Philippine Airlines

Apr 12

SEA11:55 pmSeattle/Tacoma Intl

40h 50m

1 stop

SYD9:45 amSydney Kingsford Smith

Apr 30

SYD11:35 amSydney Kingsford Smith

25h 00m

1 stop

SEA7:35 pmSeattle/Tacoma Intl

$1,031

Philippine Airlines

Feb 8

SEA9:30 pmSeattle/Tacoma Intl

41h 50m

1 stop

PER7:20 amPerth

Feb 15

PER8:35 amPerth

26h 10m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$1,156

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets

Qantas Airways

Nov 1

SEA4:59 pmSeattle/Tacoma Intl

21h 01m

1 stop

SYD9:00 amSydney Kingsford Smith

Nov 18

SYD11:10 amSydney Kingsford Smith

22h 02m

1 stop

SEA2:12 pmSeattle/Tacoma Intl

$1,051

Qantas Airways

Oct 19

SEA5:04 pmSeattle/Tacoma Intl

21h 01m

1 stop

SYD8:05 amSydney Kingsford Smith

Nov 2

SYD11:15 amSydney Kingsford Smith

18h 42m

1 stop

SEA10:57 amSeattle/Tacoma Intl

$1,066

Qantas Airways

Oct 27

SEA4:37 pmSeattle/Tacoma Intl

22h 23m

1 stop

SYD9:00 amSydney Kingsford Smith

Nov 3

SYD11:10 amSydney Kingsford Smith

22h 02m

1 stop

SEA2:12 pmSeattle/Tacoma Intl

$1,076

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

3:15 pm-2:40 pm

2 stops28h 25m

Sydney Kingsford Smith

Tue 11/17

11:20 am-9:32 am

1 stop17h 12m

$980

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/9

3:15 pm-2:40 pm

2 stops28h 25m

Sydney Kingsford Smith

Tue 11/17

8:30 am-9:32 am

2 stops20h 02m

$994

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 4/8

11:55 pm-9:45 am

1 stop40h 50m

Sydney Kingsford Smith

Thu 4/22

11:35 am-7:35 pm

1 stop25h 00m

$1,006

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/8

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Sun 11/15

6:20 am-9:32 am

2 stops22h 12m

$1,013

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/1

4:59 pm-9:00 am

1 stop21h 01m

Sydney Kingsford Smith

Wed 11/18

11:10 am-2:12 pm

1 stop22h 02m

$1,051

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 3/21

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 3/24

10:20 am-9:15 am

1 stop16h 55m

$1,057

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/17

7:00 pm-8:35 am

1 stop19h 35m

Sydney Kingsford Smith

Sun 3/28

10:20 am-9:18 am

1 stop16h 58m

$1,057

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 11/24

3:46 pm-9:00 am

1 stop22h 14m

Sydney Kingsford Smith

Tue 12/1

11:10 am-9:00 am

1 stop40h 50m

$1,077

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/1

10:21 am-6:20 am

1 stop24h 59m

Sydney Kingsford Smith

Tue 3/16

1:20 pm-3:54 pm

1 stop20h 34m

$1,087

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 1/31

5:28 pm-9:05 am

1 stop20h 37m

Sydney Kingsford Smith

Wed 3/10

11:50 am-10:21 am

1 stop17h 31m

$1,087

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 $1,056.

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 $1,164 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 $980.

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 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
Alaska Airlines	PriceFrom $97	Free Cancellation	Rating 7.9 13,070 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 1,325 reviews	Search ANA flights
Air Canada	PriceFrom $796	Free Cancellation	Rating 7.1 11,774 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,110 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $888	Free Cancellation	Rating 7.4 10,364 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 674 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,171 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,515 reviews	Search Cathay Pacific flights
Singapore Airlines	PriceFrom $1,232	Free Cancellation	Rating 8.2 1,625 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.