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

American Airlines, Delta, 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 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 July 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.

$495 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.

3:21 pm - 6:55 am

SEA

SYD

22h 34m

1 stop

9:10 am - 4:32 pm

SYD

SEA

24h 22m

1 stop

$978American Airlines

Mon, Jul 27 - Tue, Aug 11

5:50 pm - 7:50 am

SEA

MEL

21h 00m

1 stop

10:00 am - 11:44 pm

MEL

SEA

30h 44m

1 stop

$979Delta

Mon, Aug 3 - Sun, Aug 16

3:21 pm - 6:55 am

SEA

SYD

22h 34m

1 stop

5:50 pm - 9:45 pm

SYD

SEA

20h 55m

1 stop

$979American Airlines

Mon, Jul 27 - Mon, Aug 3

5:20 pm - 6:55 am

SEA

SYD

20h 35m

1 stop

9:30 am - 9:31 pm

SYD

SEA

29h 01m

2 stops

$982United Airlines

Mon, Jul 27 - Tue, Aug 11

5:20 pm - 6:55 am

SEA

SYD

20h 35m

1 stop

10:20 am - 6:29 pm

SYD

SEA

25h 09m

1 stop

$983United Airlines

Mon, Jul 27 - Tue, Aug 11

4:30 pm - 9:25 am

SEA

SYD

23h 55m

1 stop

11:45 am - 8:43 pm

SYD

SEA

25h 58m

2 stops

$990ANA

Wed, Aug 26 - Wed, Sep 2

5:50 am - 7:05 am

SEA

BNE

32h 15m

1 stop

10:00 am - 6:32 pm

BNE

SEA

25h 32m

1 stop

$1,146Air Canada

Sun, Aug 2 - Sun, Aug 16

7:20 pm - 7:05 am

SEA

BNE

18h 45m

1 stop

10:00 am - 6:32 pm

BNE

SEA

25h 32m

1 stop

$1,155Air Canada

Mon, Aug 17 - Mon, Aug 24

5:10 pm - 4:30 pm

SEA

MCY

30h 20m

2 stops

12:05 pm - 7:39 pm

MCY

SEA

24h 34m

2 stops

$1,221Qantas Airways

Thu, Aug 20 - Thu, Aug 27

2:10 pm - 10:55 am

SEA

ADL

26h 15m

2 stops

6:30 pm - 12:04 am

ADL

SEA

24h 04m

2 stops

$1,222Qantas Airways

Wed, Nov 11 - Wed, Nov 18

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Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Aug 2

SEA10:40 amSeattle/Tacoma Intl

33h 00m

2 stops

SYD12:40 pmSydney Kingsford Smith

Aug 9

SYD7:00 amSydney Kingsford Smith

20h 05m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$1,048

Air Canada

Sep 13

SEA5:50 amSeattle/Tacoma Intl

32h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Oct 14

SYD10:20 amSydney Kingsford Smith

30h 22m

1 stop

SEA10:42 pmSeattle/Tacoma Intl

$1,054

Air Canada

Jul 27

SEA5:45 amSeattle/Tacoma Intl

32h 35m

1 stop

SYD7:20 amSydney Kingsford Smith

Aug 2

SYD9:20 amSydney Kingsford Smith

22h 02m

1 stop

SEA2:22 pmSeattle/Tacoma Intl

$1,065

American Airlines flights from Seattle to Australia

Our best American Airlines deals on Seattle to Australia flight tickets

American Airlines

Jul 27

SEA3:21 pmSeattle/Tacoma Intl

22h 34m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 11

SYD9:10 amSydney Kingsford Smith

24h 22m

1 stop

SEA4:32 pmSeattle/Tacoma Intl

$978

American Airlines

Jul 27

SEA3:21 pmSeattle/Tacoma Intl

22h 34m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 3

SYD5:50 pmSydney Kingsford Smith

20h 55m

1 stop

SEA9:45 pmSeattle/Tacoma Intl

$979

American Airlines

Aug 17

SEA11:40 amSeattle/Tacoma Intl

26h 25m

1 stop

SYD7:05 amSydney Kingsford Smith

Aug 24

SYD9:10 amSydney Kingsford Smith

24h 31m

2 stops

SEA4:41 pmSeattle/Tacoma Intl

$981

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 7/27

3:21 pm-6:55 am

1 stop22h 34m

Sydney Kingsford Smith

Tue 8/11

9:10 am-4:32 pm

1 stop24h 22m

$978

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 8/3

5:50 pm-7:50 am

1 stop21h 00m

Melbourne

Sun 8/16

10:00 am-11:44 pm

1 stop30h 44m

$979

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 7/27

3:21 pm-6:55 am

1 stop22h 34m

Sydney Kingsford Smith

Mon 8/3

5:50 pm-9:45 pm

1 stop20h 55m

$979

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 7/27

5:20 pm-6:55 am

1 stop20h 35m

Sydney Kingsford Smith

Tue 8/11

9:30 am-9:31 pm

2 stops29h 01m

$982

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 7/27

5:20 pm-6:55 am

1 stop20h 35m

Sydney Kingsford Smith

Tue 8/11

10:20 am-6:29 pm

1 stop25h 09m

$983

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 8/26

4:30 pm-9:25 am

1 stop23h 55m

Sydney Kingsford Smith

Wed 9/2

11:45 am-8:43 pm

2 stops25h 58m

$990

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 8/2

5:50 am-7:05 am

1 stop32h 15m

Brisbane

Sun 8/16

10:00 am-6:32 pm

1 stop25h 32m

$1,146

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 8/17

7:20 pm-7:05 am

1 stop18h 45m

Brisbane

Mon 8/24

10:00 am-6:32 pm

1 stop25h 32m

$1,155

SeattleMaroochydore

SEA - MCY

SEAMCY

Seattle/Tacoma Intl

Thu 8/20

5:10 pm-4:30 pm

2 stops30h 20m

Maroochydore Sunshine Coast

Thu 8/27

12:05 pm-7:39 pm

2 stops24h 34m

$1,221

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 11/11

2:10 pm-10:55 am

2 stops26h 15m

Adelaide

Wed 11/18

6:30 pm-12:04 am

2 stops24h 04m

$1,222

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 January is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $97. If you aren’t able to travel during the month of January, then book flights to Australia from Seattle during February instead. Flights to Australia in February, while not as cheap as those in January, still average around $142.

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 $1,074 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 $936 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 21% 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

Fastest flight time	17h 45m
Direct flights	None

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 July 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 12,635 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,321 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,266 reviews	Search ANA flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 1,057 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,783 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,824 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $831	Free Cancellation	Rating 7.4 9,948 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,451 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 649 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,404 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.