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

Delta, United Airlines, and American 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.

$496 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.

11:06 am - 7:30 am

SEA

SYD

26h 24m

1 stop

2:00 pm - 6:26 pm

SYD

SEA

22h 26m

2 stops

$936Multiple Airlines

Tue, Oct 20 - Tue, Oct 27

12:57 pm - 12:50 pm

SEA

BNE

29h 53m

2 stops

1:10 pm - 6:43 pm

BNE

SEA

23h 33m

1 stop

$941Qantas Airways

Tue, Dec 8 - Sat, Dec 26

10:40 am - 9:25 am

SEA

SYD

29h 45m

2 stops

12:45 pm - 6:32 pm

SYD

SEA

23h 47m

2 stops

$966ANA

Sun, Aug 23 - Mon, Oct 19

4:30 pm - 9:25 am

SEA

SYD

23h 55m

1 stop

12:45 pm - 6:32 pm

SYD

SEA

23h 47m

2 stops

$973ANA

Sun, Aug 16 - Wed, Oct 14

5:50 pm - 7:50 am

SEA

MEL

21h 00m

1 stop

10:00 am - 11:44 pm

MEL

SEA

30h 44m

1 stop

$980Delta

Mon, Aug 3 - Sun, Aug 16

5:50 pm - 7:50 am

SEA

MEL

21h 00m

1 stop

10:00 am - 11:44 pm

MEL

SEA

30h 44m

1 stop

$983Delta

Mon, Aug 3 - Sun, Aug 16

3:00 pm - 7:05 am

SEA

BNE

23h 05m

1 stop

10:15 am - 10:42 pm

BNE

SEA

29h 27m

1 stop

$1,025Air Canada

Tue, Aug 11 - Tue, Aug 18

10:40 am - 7:05 am

SEA

BNE

27h 25m

1 stop

10:15 am - 10:42 pm

BNE

SEA

29h 27m

1 stop

$1,035Air Canada

Wed, Aug 12 - Tue, Aug 18

3:30 pm - 1:15 pm

SEA

CBR

28h 45m

2 stops

6:50 pm - 9:15 pm

CBR

SEA

43h 25m

3 stops

$1,167United Airlines

Tue, Aug 18 - Tue, Aug 25

1:30 pm - 11:10 am

SEA

ADL

29h 10m

2 stops

6:05 am - 4:14 pm

ADL

SEA

26h 39m

2 stops

$1,215United Airlines

Mon, Aug 3 - Tue, Sep 22

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ANA flights from Seattle to Australia

Our best ANA deals on Seattle to Australia flight tickets

ANA

Jul 26

SEA4:30 pmSeattle/Tacoma Intl

33h 40m

1 stop

SYD7:10 pmSydney Kingsford Smith

Aug 11

SYD11:45 amSydney Kingsford Smith

23h 47m

2 stops

SEA6:32 pmSeattle/Tacoma Intl

$927

ANA

Aug 23

SEA10:40 amSeattle/Tacoma Intl

29h 45m

2 stops

SYD9:25 amSydney Kingsford Smith

Oct 19

SYD12:45 pmSydney Kingsford Smith

23h 47m

2 stops

SEA6:32 pmSeattle/Tacoma Intl

$966

ANA

Aug 2

SEA10:40 amSeattle/Tacoma Intl

29h 45m

2 stops

SYD9:25 amSydney Kingsford Smith

Aug 18

SYD11:45 amSydney Kingsford Smith

23h 47m

2 stops

SEA6:32 pmSeattle/Tacoma Intl

$967

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Aug 11

SEA3:00 pmSeattle/Tacoma Intl

23h 05m

1 stop

BNE7:05 amBrisbane

Aug 18

BNE10:15 amBrisbane

29h 27m

1 stop

SEA10:42 pmSeattle/Tacoma Intl

$1,025

Air Canada

Aug 12

SEA10:40 amSeattle/Tacoma Intl

27h 25m

1 stop

BNE7:05 amBrisbane

Aug 18

BNE10:15 amBrisbane

29h 27m

1 stop

SEA10:42 pmSeattle/Tacoma Intl

$1,035

Air Canada

Aug 17

SEA5:50 amSeattle/Tacoma Intl

36h 40m

2 stops

BNE11:30 amBrisbane

Aug 25

BNE10:15 amBrisbane

25h 17m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,048

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 10/20

11:06 am-7:30 am

1 stop26h 24m

Sydney Kingsford Smith

Tue 10/27

2:00 pm-6:26 pm

2 stops22h 26m

$936

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 12/8

12:57 pm-12:50 pm

2 stops29h 53m

Brisbane

Sat 12/26

1:10 pm-6:43 pm

1 stop23h 33m

$941

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/23

10:40 am-9:25 am

2 stops29h 45m

Sydney Kingsford Smith

Mon 10/19

12:45 pm-6:32 pm

2 stops23h 47m

$966

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/16

4:30 pm-9:25 am

1 stop23h 55m

Sydney Kingsford Smith

Wed 10/14

12:45 pm-6:32 pm

2 stops23h 47m

$973

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

$980

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

$983

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 8/11

3:00 pm-7:05 am

1 stop23h 05m

Brisbane

Tue 8/18

10:15 am-10:42 pm

1 stop29h 27m

$1,025

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 8/12

10:40 am-7:05 am

1 stop27h 25m

Brisbane

Tue 8/18

10:15 am-10:42 pm

1 stop29h 27m

$1,035

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Tue 8/18

3:30 pm-1:15 pm

2 stops28h 45m

Canberra

Tue 8/25

6:50 pm-9:15 pm

3 stops43h 25m

$1,167

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 8/3

1:30 pm-11:10 am

2 stops29h 10m

Adelaide

Tue 9/22

6:05 am-4:14 pm

2 stops26h 39m

$1,215

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 $968. 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 $1,054.

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 $1,088 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	18h 45m
Direct flights	None

The fastest flight from Seattle to Australia takes 18h 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 12,704 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,377 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,276 reviews	Search ANA flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,067 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,837 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,821 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $831	Free Cancellation	Rating 7.4 10,025 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,481 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 654 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,425 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.