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

United Airlines, Philippine Airlines, and Delta 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 38% 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.

$488 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

8:30 am - 9:27 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 57m2 stops Brisbane Vancouver Intl

$967Air Canada

Sun, Nov 8 - Sun, Nov 22

7:05 pm - 4:40 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 35m2 stops Vancouver Intl Brisbane

8:30 am - 9:27 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 57m2 stops Brisbane Vancouver Intl

$986Air Canada

Sun, Nov 8 - Sun, Nov 22

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

$1,007Philippine Airlines

Thu, Mar 18 - Wed, Apr 21

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

$1,007Multiple Airlines

Tue, Feb 2 - Fri, Feb 12

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

$1,030Air New Zealand

Sun, Nov 29 - Tue, Dec 8

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

$1,030Air New Zealand

Mon, Nov 23 - Tue, Dec 8

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

21h 28m1 stop Los Angeles

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

20h 45m1 stop Los Angeles

$1,060Qantas Airways

Sun, Oct 18 - Mon, Nov 2

5:04 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 56m1 stop Los Angeles

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

20h 50m1 stop Los Angeles

$1,072Qantas Airways

Tue, Oct 27 - Tue, Nov 3

7:10 am - 8:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

30h 55m1 stop Los Angeles

2:05 pm - 4:54 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 49m1 stop Dallas/Fort Worth

$1,085American Airlines

Sun, Oct 18 - Mon, Nov 2

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

21h 28m1 stop Los Angeles

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

20h 45m1 stop Los Angeles

$1,085American Airlines

Sun, Oct 18 - Mon, Nov 2

Cheap last minute flights

Enter your travel dates to find the best prices.

11:10 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 50m1 stop Manila Ninoy Aquino Intl

11:30 am - 6:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$1,159Philippine Airlines

Fri, Oct 2 - Fri, Nov 6

7:00 am - 6:50 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

17h 50m1 stop Honolulu

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

20h 47m1 stop Honolulu

$1,231Multiple Airlines

Wed, Oct 7 - Tue, Oct 20

4:35 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 25m1 stop Los Angeles

11:55 am - 6:44 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 49m2 stops Auckland Intl San Francisco

$1,510Air New Zealand

Wed, Oct 7 - Tue, Oct 20

1:20 pm - 9:15 amSEA Seattle/Tacoma Intl-MEL Melbourne

25h 55m1 stop San Francisco

11:55 am - 2:17 pmMEL Melbourne-SEA Seattle/Tacoma Intl

20h 22m1 stop San Francisco

$1,587United Airlines

Mon, Oct 5 - Tue, Oct 13

8:30 am - 8:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

30h 00m2 stops Denver Intl Los Angeles

11:55 am - 5:37 pmMEL Melbourne-SEA Seattle/Tacoma Intl

23h 42m2 stops San Francisco Denver Intl

$1,592United Airlines

Mon, Oct 5 - Tue, Oct 13

11:20 am - 10:30 pmSEA Seattle/Tacoma Intl-BNE Brisbane

42h 10m2 stops Vancouver Intl Hong Kong Intl

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

27h 00m1 stop Hong Kong Intl

$1,599Cathay Pacific

Thu, Oct 8 - Fri, Oct 16

11:33 am - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 57m1 stop Los Angeles

6:50 pm - 10:00 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 10m1 stop Los Angeles

$1,630Alaska Airlines

Sat, Oct 3 - Mon, Oct 5

12:13 pm - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 17m2 stops Portland Los Angeles

6:50 pm - 8:56 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 06m1 stop Los Angeles

$1,635Alaska Airlines

Sat, Oct 3 - Mon, Oct 5

1:28 pm - 11:15 pmSEA Seattle/Tacoma Intl-MEL Melbourne

63h 47m2 stops Vancouver Intl Hong Kong Intl

3:25 pm - 10:05 amMEL Melbourne-SEA Seattle/Tacoma Intl

36h 40m1 stop Hong Kong Intl

$1,672Cathay Pacific

Mon, Oct 5 - Tue, Oct 13

4:35 pm - 8:30 amSEA Seattle/Tacoma Intl-MEL Melbourne

21h 55m1 stop Los Angeles

12:10 pm - 7:29 pmMEL Melbourne-SEA Seattle/Tacoma Intl

25h 19m2 stops Auckland Intl Los Angeles

$1,789Air New Zealand

Mon, Oct 5 - Tue, Oct 13

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Air New Zealand flights from Seattle to Australia

Our best Air New Zealand deals on Seattle to Australia flight tickets

Air New Zealand

Nov 23

SEA7:05 pmSeattle/Tacoma Intl

19h 30m

1 stop

SYD9:35 amSydney Kingsford Smith

Dec 9

SYD11:20 amSydney Kingsford Smith

22h 17m

1 stop

SEA2:37 pmSeattle/Tacoma Intl

$1,030

Air New Zealand

Nov 3

SEA3:15 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD9:35 amSydney Kingsford Smith

Dec 2

SYD11:20 amSydney Kingsford Smith

17h 12m

1 stop

SEA9:32 amSeattle/Tacoma Intl

$1,043

Air New Zealand

Nov 9

SEA3:15 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD9:35 amSydney Kingsford Smith

Dec 6

SYD11:20 amSydney Kingsford Smith

17h 12m

1 stop

SEA9:32 amSeattle/Tacoma Intl

$1,050

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Nov 8

SEA10:10 amSeattle/Tacoma Intl

28h 25m

1 stop

SYD9:35 amSydney Kingsford Smith

Nov 22

SYD8:30 amSydney Kingsford Smith

19h 57m

2 stops

SEA9:27 amSeattle/Tacoma Intl

$967

Air Canada

Nov 8

SEA7:05 pmSeattle/Tacoma Intl

26h 35m

2 stops

SYD4:40 pmSydney Kingsford Smith

Nov 22

SYD8:30 amSydney Kingsford Smith

19h 57m

2 stops

SEA9:27 amSeattle/Tacoma Intl

$986

Air Canada

Oct 26

SEA7:05 pmSeattle/Tacoma Intl

19h 30m

1 stop

SYD8:35 amSydney Kingsford Smith

Nov 8

SYD11:20 amSydney Kingsford Smith

17h 12m

1 stop

SEA9:32 amSeattle/Tacoma Intl

$992

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 11/8

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Sun 11/22

8:30 am-9:27 am

2 stops19h 57m

$967

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/8

7:05 pm-4:40 pm

2 stops26h 35m

Sydney Kingsford Smith

Sun 11/22

8:30 am-9:27 am

2 stops19h 57m

$986

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

$1,007

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

Fri 2/12

11:20 am-7:58 am

2 stops39h 38m

$1,007

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/29

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 12/8

11:20 am-9:32 am

1 stop17h 12m

$1,030

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/23

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 12/8

11:20 am-9:32 am

1 stop17h 12m

$1,030

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

4:37 pm-8:05 am

1 stop21h 28m

Sydney Kingsford Smith

Mon 11/2

11:15 am-1:00 pm

1 stop20h 45m

$1,060

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/27

5:04 pm-9:00 am

1 stop21h 56m

Sydney Kingsford Smith

Tue 11/3

11:10 am-1:00 pm

1 stop20h 50m

$1,072

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

7:10 am-8:05 am

1 stop30h 55m

Sydney Kingsford Smith

Mon 11/2

2:05 pm-4:54 pm

1 stop21h 49m

$1,085

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

4:37 pm-8:05 am

1 stop21h 28m

Sydney Kingsford Smith

Mon 11/2

11:15 am-1:00 pm

1 stop20h 45m

$1,085

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 $1,036. 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 $1,162 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 $1,010 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 9% 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	$488
Fastest flight time	17h 45m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $488. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $967.

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 13,005 reviews	Search Alaska Airlines flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,624 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,319 reviews	Search ANA flights
Air Canada	PriceFrom $796	Free Cancellation	Rating 7.1 11,712 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,101 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $822	Free Cancellation	Rating 7.8 2,808 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $845	Free Cancellation	Rating 7.4 10,275 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 670 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,111 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,507 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.