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

American Airlines, Air New Zealand, 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 13 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 April 2026, there are 13 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.

$427 Cheap Flights from Seattle to Australia in 2026

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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.

6:40 pm - 7:30 am

SEA

SYD

19h 50m

1 stop

9:10 am - 11:01 am

SYD

SEA

18h 51m

1 stop

$1,060Multiple Airlines

Mon, May 18 - Wed, Jun 3

2:20 pm - 7:05 am

SEA

SYD

23h 45m

1 stop

5:50 pm - 8:56 pm

SYD

SEA

20h 06m

1 stop

$1,069Qantas Airways

Sat, Aug 1 - Fri, Aug 14

5:50 am - 7:20 am

SEA

SYD

32h 30m

1 stop

9:20 am - 10:40 pm

SYD

SEA

30h 20m

1 stop

$1,083Air Canada

Mon, May 18 - Wed, Jun 3

10:45 am - 7:20 am

SEA

SYD

27h 35m

1 stop

9:20 am - 6:30 pm

SYD

SEA

26h 10m

1 stop

$1,084Air Canada

Mon, May 18 - Wed, Jun 3

5:20 pm - 6:55 am

SEA

SYD

20h 35m

1 stop

10:20 am - 4:20 pm

SYD

SEA

23h 00m

1 stop

$1,089United Airlines

Mon, Jun 8 - Mon, Jun 15

7:35 pm - 8:15 am

SEA

MEL

19h 40m

1 stop

10:55 am - 4:15 pm

MEL

SEA

22h 20m

1 stop

$1,092United Airlines

Fri, Aug 14 - Sat, Aug 29

4:30 pm - 7:10 pm

SEA

SYD

33h 40m

1 stop

11:45 am - 11:24 pm

SYD

SEA

28h 39m

2 stops

$1,098ANA

Sun, Aug 2 - Wed, Aug 19

2:30 pm - 8:50 am

SEA

MEL

24h 20m

1 stop

11:00 am - 2:47 pm

MEL

SEA

21h 47m

1 stop

$1,100Delta

Mon, Oct 5 - Tue, Oct 13

3:00 pm - 7:50 am

SEA

MEL

23h 50m

1 stop

10:00 am - 10:05 pm

MEL

SEA

29h 05m

2 stops

$1,104Delta

Mon, Jun 1 - Wed, Jun 10

4:30 pm - 2:40 pm

SEA

OOL

53h 10m

2 stops

7:05 am - 2:25 pm

OOL

SEA

48h 20m

2 stops

$1,316ANA

Thu, Jun 4 - Mon, Jun 15

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

May 3

SEA7:20 pmSeattle/Tacoma Intl

19h 00m

1 stop

SYD7:20 amSydney Kingsford Smith

May 19

SYD9:20 amSydney Kingsford Smith

17h 45m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$1,033

Air Canada

May 3

SEA10:45 amSeattle/Tacoma Intl

27h 35m

1 stop

SYD7:20 amSydney Kingsford Smith

May 19

SYD9:20 amSydney Kingsford Smith

22h 00m

1 stop

SEA2:20 pmSeattle/Tacoma Intl

$1,066

Air Canada

May 18

SEA5:50 amSeattle/Tacoma Intl

32h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Jun 3

SYD9:20 amSydney Kingsford Smith

30h 20m

1 stop

SEA10:40 pmSeattle/Tacoma Intl

$1,083

United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets

United Airlines

Apr 30

SEA5:25 pmSeattle/Tacoma Intl

21h 50m

1 stop

MEL8:15 amMelbourne

May 13

MEL10:55 amMelbourne

18h 30m

1 stop

SEA12:25 pmSeattle/Tacoma Intl

$1,085

United Airlines

Jun 8

SEA5:20 pmSeattle/Tacoma Intl

20h 35m

1 stop

SYD6:55 amSydney Kingsford Smith

Jun 15

SYD10:20 amSydney Kingsford Smith

23h 00m

1 stop

SEA4:20 pmSeattle/Tacoma Intl

$1,089

United Airlines

May 3

SEA8:45 amSeattle/Tacoma Intl

29h 15m

1 stop

SYD7:00 amSydney Kingsford Smith

May 19

SYD9:30 amSydney Kingsford Smith

28h 36m

2 stops

SEA9:06 pmSeattle/Tacoma Intl

$1,092

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/18

6:40 pm-7:30 am

1 stop19h 50m

Sydney Kingsford Smith

Wed 6/3

9:10 am-11:01 am

1 stop18h 51m

$1,060

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 8/1

2:20 pm-7:05 am

1 stop23h 45m

Sydney Kingsford Smith

Fri 8/14

5:50 pm-8:56 pm

1 stop20h 06m

$1,069

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/18

5:50 am-7:20 am

1 stop32h 30m

Sydney Kingsford Smith

Wed 6/3

9:20 am-10:40 pm

1 stop30h 20m

$1,083

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/18

10:45 am-7:20 am

1 stop27h 35m

Sydney Kingsford Smith

Wed 6/3

9:20 am-6:30 pm

1 stop26h 10m

$1,084

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/8

5:20 pm-6:55 am

1 stop20h 35m

Sydney Kingsford Smith

Mon 6/15

10:20 am-4:20 pm

1 stop23h 00m

$1,089

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 8/14

7:35 pm-8:15 am

1 stop19h 40m

Melbourne

Sat 8/29

10:55 am-4:15 pm

1 stop22h 20m

$1,092

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/2

4:30 pm-7:10 pm

1 stop33h 40m

Sydney Kingsford Smith

Wed 8/19

11:45 am-11:24 pm

2 stops28h 39m

$1,098

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 10/5

2:30 pm-8:50 am

1 stop24h 20m

Melbourne

Tue 10/13

11:00 am-2:47 pm

1 stop21h 47m

$1,100

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 6/1

3:00 pm-7:50 am

1 stop23h 50m

Melbourne

Wed 6/10

10:00 am-10:05 pm

2 stops29h 05m

$1,104

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Thu 6/4

4:30 pm-2:40 pm

2 stops53h 10m

Coolangatta Gold Coast

Mon 6/15

7:05 am-2:25 pm

2 stops48h 20m

$1,316

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 $1,064 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 $900 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 18% 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 50m
Direct flights	None

The fastest flight from Seattle to Australia takes 17h 50m

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 April 2026, there are 13 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 12,304 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 10,974 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,197 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,028 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,673 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,672 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,464 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 638 reviews	Search Air New Zealand flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	Search Alaska 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.