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

Qantas Airways, Air Canada, 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 March 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.

$361 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.

5:06 pm - 12:25 pm

SEA

MEL

26h 19m

2 stops

1:30 pm - 11:44 pm

MEL

SEA

27h 14m

2 stops

$860Multiple Airlines

Mon, May 4 - Mon, May 18

6:40 pm - 7:05 am

SEA

SYD

19h 25m

1 stop

9:10 am - 10:58 pm

SYD

SEA

30h 48m

1 stop

$876Qantas Airways

Sun, Apr 26 - Sun, May 3

3:40 pm - 7:05 am

SEA

BNE

22h 25m

1 stop

10:00 am - 9:50 am

BNE

SEA

16h 50m

1 stop

$881Air Canada

Wed, Apr 29 - Sun, May 10

10:20 am - 7:05 am

SEA

BNE

27h 45m

1 stop

10:00 am - 9:50 am

BNE

SEA

16h 50m

1 stop

$882Air Canada

Tue, Apr 28 - Sun, May 10

11:41 am - 7:05 am

SEA

SYD

26h 24m

2 stops

9:10 am - 6:07 pm

SYD

SEA

25h 57m

1 stop

$885American Airlines

Mon, Apr 27 - Sun, May 10

10:15 am - 5:10 am

SEA

PER

27h 55m

1 stop

4:55 pm - 8:45 am

PER

SEA

30h 50m

1 stop

$1,096Singapore Airlines

Thu, Sep 3 - Sat, Oct 3

10:15 am - 5:10 am

SEA

PER

27h 55m

1 stop

1:45 pm - 8:45 am

PER

SEA

34h 00m

1 stop

$1,098Singapore Airlines

Thu, Sep 3 - Sat, Oct 3

10:00 am - 11:55 am

SEA

DRW

33h 25m

2 stops

12:45 pm - 10:58 pm

DRW

SEA

26h 43m

2 stops

$1,299American Airlines

Tue, Apr 28 - Tue, May 5

7:05 pm - 1:15 pm

SEA

CBR

25h 10m

2 stops

6:50 pm - 9:10 pm

CBR

SEA

43h 20m

3 stops

$1,428United Airlines

Mon, Jun 1 - Tue, Jun 30

11:35 am - 11:55 am

SEA

HBA

31h 20m

2 stops

6:25 am - 9:06 pm

HBA

SEA

31h 41m

3 stops

$1,440United Airlines

Sun, Apr 26 - Sun, May 3

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets

Qantas Airways

Apr 29

SEA7:06 pmSeattle/Tacoma Intl

18h 59m

1 stop

SYD7:05 amSydney Kingsford Smith

May 6

SYD9:10 amSydney Kingsford Smith

23h 40m

1 stop

SEA3:50 pmSeattle/Tacoma Intl

$863

Qantas Airways

Apr 26

SEA6:40 pmSeattle/Tacoma Intl

19h 25m

1 stop

SYD7:05 amSydney Kingsford Smith

May 3

SYD9:10 amSydney Kingsford Smith

30h 48m

1 stop

SEA10:58 pmSeattle/Tacoma Intl

$876

Qantas Airways

Apr 27

SEA7:06 pmSeattle/Tacoma Intl

19h 24m

1 stop

SYD7:30 amSydney Kingsford Smith

May 4

SYD5:50 pmSydney Kingsford Smith

22h 02m

1 stop

SEA10:52 pmSeattle/Tacoma Intl

$877

American Airlines flights from Seattle to Australia

Our best American Airlines deals on Seattle to Australia flight tickets

American Airlines

Apr 27

SEA11:41 amSeattle/Tacoma Intl

26h 24m

2 stops

SYD7:05 amSydney Kingsford Smith

May 10

SYD9:10 amSydney Kingsford Smith

25h 57m

1 stop

SEA6:07 pmSeattle/Tacoma Intl

$885

American Airlines

Apr 26

SEA11:41 amSeattle/Tacoma Intl

26h 24m

2 stops

SYD7:05 amSydney Kingsford Smith

May 3

SYD9:10 amSydney Kingsford Smith

25h 39m

2 stops

SEA5:49 pmSeattle/Tacoma Intl

$894

American Airlines

May 17

SEA6:40 pmSeattle/Tacoma Intl

19h 25m

1 stop

SYD7:05 amSydney Kingsford Smith

May 24

SYD9:10 amSydney Kingsford Smith

21h 47m

1 stop

SEA1:57 pmSeattle/Tacoma Intl

$895

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 5/4

5:06 pm-12:25 pm

2 stops26h 19m

Melbourne

Mon 5/18

1:30 pm-11:44 pm

2 stops27h 14m

$860

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/26

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Sun 5/3

9:10 am-10:58 pm

1 stop30h 48m

$876

Quickest round-trip

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 4/29

3:40 pm-7:05 am

1 stop22h 25m

Brisbane

Sun 5/10

10:00 am-9:50 am

1 stop16h 50m

$881

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 4/28

10:20 am-7:05 am

1 stop27h 45m

Brisbane

Sun 5/10

10:00 am-9:50 am

1 stop16h 50m

$882

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/27

11:41 am-7:05 am

2 stops26h 24m

Sydney Kingsford Smith

Sun 5/10

9:10 am-6:07 pm

1 stop25h 57m

$885

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Thu 9/3

10:15 am-5:10 am

1 stop27h 55m

Perth

Sat 10/3

4:55 pm-8:45 am

1 stop30h 50m

$1,096

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Thu 9/3

10:15 am-5:10 am

1 stop27h 55m

Perth

Sat 10/3

1:45 pm-8:45 am

1 stop34h 00m

$1,098

SeattleDarwin

SEA - DRW

SEADRW

Seattle/Tacoma Intl

Tue 4/28

10:00 am-11:55 am

2 stops33h 25m

Darwin

Tue 5/5

12:45 pm-10:58 pm

2 stops26h 43m

$1,299

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Mon 6/1

7:05 pm-1:15 pm

2 stops25h 10m

Canberra

Tue 6/30

6:50 pm-9:10 pm

3 stops43h 20m

$1,428

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Sun 4/26

11:35 am-11:55 am

2 stops31h 20m

Hobart

Sun 5/3

6:25 am-9:06 pm

3 stops31h 41m

$1,440

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 $824. 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 $857.

How far in advance should I book a flight 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 $1,071 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 $902 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 11% 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

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 March 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 12,052 reviews	Search Alaska Airlines flights
Delta	PriceFrom $237	Free Cancellation	Rating 7.9 8,296 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,129 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,004 reviews	Search Qantas Airways flights
Philippine Airlines	PriceFrom $758	Free Cancellation	Rating 7.3 967 reviews	Search Philippine Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,805 reviews	Search Air Canada flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,467 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,839 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,428 reviews	Search United Airlines 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.