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

Air Canada, Qantas Airways, and Qatar Airways 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 41% 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 January 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.

$414 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.

7:20 pm - 11:05 am

SEA

MEL

22h 45m

2 stops

6:00 am - 9:15 am

MEL

SEA

20h 15m

2 stops

$817Multiple Airlines

Tue, May 5 - Fri, May 29

8:00 pm - 11:30 am

SEA

BNE

22h 30m

2 stops

10:00 am - 10:20 pm

BNE

SEA

29h 20m

1 stop

$833Multiple Airlines

Thu, Apr 30 - Sun, May 17

9:55 am - 8:45 am

SEA

BNE

28h 50m

1 stop

10:45 am - 3:01 pm

BNE

SEA

22h 16m

1 stop

$847Air Canada

Wed, Feb 25 - Wed, Mar 4

10:05 am - 8:45 am

SEA

BNE

28h 40m

1 stop

10:45 am - 10:57 pm

BNE

SEA

29h 12m

1 stop

$849Air Canada

Sun, Mar 1 - Mon, Mar 9

5:53 pm - 3:35 pm

SEA

MEL

26h 42m

2 stops

12:00 pm - 6:57 pm

MEL

SEA

25h 57m

1 stop

$936Qantas Airways

Sun, Feb 8 - Tue, Feb 17

5:53 pm - 5:40 pm

SEA

SYD

28h 47m

2 stops

11:20 am - 12:29 pm

SYD

SEA

20h 09m

1 stop

$957Qantas Airways

Wed, Feb 4 - Wed, Feb 11

10:15 am - 5:10 am

SEA

PER

27h 55m

1 stop

1:45 pm - 8:45 am

PER

SEA

34h 00m

1 stop

$1,090Singapore Airlines

Thu, Apr 30 - Mon, May 4

10:15 am - 12:30 pm

SEA

PER

35h 15m

1 stop

1:10 am - 8:45 am

PER

SEA

22h 35m

1 stop

$1,107Singapore Airlines

Tue, Apr 7 - Mon, Apr 27

5:10 pm - 9:30 am

SEA

ADL

21h 50m

1 stop

2:55 pm - 9:01 pm

ADL

SEA

24h 36m

1 stop

$1,117United Airlines

Mon, Feb 9 - Mon, Feb 16

5:10 pm - 9:30 am

SEA

ADL

21h 50m

1 stop

2:55 pm - 11:30 pm

ADL

SEA

27h 05m

1 stop

$1,119United Airlines

Mon, Feb 9 - Mon, Feb 16

Alaska Airlines flights from Seattle to Australia

Our best Alaska Airlines deals on Seattle to Australia flight tickets

Alaska Airlines

Feb 4

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Feb 7

SYD9:40 pmSydney Kingsford Smith

18h 22m

1 stop

SEA9:02 pmSeattle/Tacoma Intl

$1,149

Alaska Airlines

Jan 30

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Feb 1

SYD9:40 pmSydney Kingsford Smith

37h 03m

1 stop

SEA3:43 pmSeattle/Tacoma Intl

$1,183

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

Feb 20

SEA8:30 amSeattle/Tacoma Intl

29h 50m

2 stops

BNE8:20 amBrisbane

Mar 1

BNE10:40 amBrisbane

24h 08m

2 stops

SEA4:48 pmSeattle/Tacoma Intl

$1,030

Delta

Feb 20

SEA2:00 pmSeattle/Tacoma Intl

24h 20m

1 stop

BNE8:20 amBrisbane

Mar 1

BNE10:40 amBrisbane

31h 29m

2 stops

SEA12:09 amSeattle/Tacoma Intl

$1,031

Delta

Feb 11

SEA11:25 amSeattle/Tacoma Intl

25h 35m

2 stops

MEL8:00 amMelbourne

Feb 22

MEL10:10 amMelbourne

32h 59m

2 stops

SEA12:09 amSeattle/Tacoma Intl

$1,071

Fly from

Fly to

Route

Depart

Return

Price

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 5/5

7:20 pm-11:05 am

2 stops22h 45m

Melbourne

Fri 5/29

6:00 am-9:15 am

2 stops20h 15m

$817

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 4/30

8:00 pm-11:30 am

2 stops22h 30m

Brisbane

Sun 5/17

10:00 am-10:20 pm

1 stop29h 20m

$833

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 2/25

9:55 am-8:45 am

1 stop28h 50m

Brisbane

Wed 3/4

10:45 am-3:01 pm

1 stop22h 16m

$847

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sun 3/1

10:05 am-8:45 am

1 stop28h 40m

Brisbane

Mon 3/9

10:45 am-10:57 pm

1 stop29h 12m

$849

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 2/8

5:53 pm-3:35 pm

2 stops26h 42m

Melbourne

Tue 2/17

12:00 pm-6:57 pm

1 stop25h 57m

$936

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/4

5:53 pm-5:40 pm

2 stops28h 47m

Sydney Kingsford Smith

Wed 2/11

11:20 am-12:29 pm

1 stop20h 09m

$957

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Thu 4/30

10:15 am-5:10 am

1 stop27h 55m

Perth

Mon 5/4

1:45 pm-8:45 am

1 stop34h 00m

$1,090

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Tue 4/7

10:15 am-12:30 pm

1 stop35h 15m

Perth

Mon 4/27

1:10 am-8:45 am

1 stop22h 35m

$1,107

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 2/9

5:10 pm-9:30 am

1 stop21h 50m

Adelaide

Mon 2/16

2:55 pm-9:01 pm

1 stop24h 36m

$1,117

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 2/9

5:10 pm-9:30 am

1 stop21h 50m

Adelaide

Mon 2/16

2:55 pm-11:30 pm

1 stop27h 05m

$1,119

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 $846. If you aren’t able to travel during the month of August, then book flights to Australia from Seattle during September instead. Flights to Australia in September, while not as cheap as those in August, still average around $860.

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 $1,055 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 $876 on momondo.

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

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 January 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 8.0 11,808 reviews	Search Alaska Airlines flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,078 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 981 reviews	Search Qantas Airways flights
Philippine Airlines	PriceFrom $758	Free Cancellation	Rating 7.3 957 reviews	Search Philippine Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,667 reviews	Search Air Canada flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,207 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,830 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $830	Free Cancellation	Rating 7.4 9,214 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,124 reviews	Search Delta flights
Qatar Airways	PriceFrom $928	Free Cancellation	Rating 7.4 3,725 reviews	Search Qatar Airways 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.