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

Air Canada, Philippine 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 42% 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 December 2025, 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.

$405 Cheap Flights from Seattle to Australia in 2025/26

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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.

9:55 am - 8:45 am

SEA

BNE

28h 50m1 stop

10:45 am - 2:31 pm

BNE

SEA

21h 46m1 stop

$796Air Canada

Mon, Feb 9 - Sun, Feb 22

3:40 pm - 8:45 am

SEA

BNE

23h 05m1 stop

10:45 am - 9:31 am

BNE

SEA

16h 46m1 stop

$797Air Canada

Thu, Feb 19 - Wed, Mar 4

3:40 pm - 2:20 pm

SEA

BNE

28h 40m2 stops

10:45 am - 3:01 pm

BNE

SEA

22h 16m1 stop

$813Multiple Airlines

Thu, Feb 19 - Wed, Mar 4

3:40 pm - 8:45 am

SEA

BNE

23h 05m1 stop

6:10 am - 9:15 am

BNE

SEA

21h 05m2 stops

$814Multiple Airlines

Mon, Feb 16 - Wed, Feb 25

3:50 pm - 7:25 am

SEA

SYD

20h 35m1 stop

5:45 pm - 6:57 pm

SYD

SEA

20h 12m1 stop

$1,085Qantas Airways

Fri, Feb 13 - Sat, Feb 28

6:01 am - 10:55 am

SEA

SYD

33h 54m2 stops

11:20 am - 8:42 pm

SYD

SEA

27h 22m1 stop

$1,093Qantas Airways

Fri, Feb 27 - Sun, Mar 22

10:15 am - 12:30 pm

SEA

PER

35h 15m1 stop

1:10 am - 8:45 am

PER

SEA

22h 35m1 stop

$1,105Singapore Airlines

Tue, Apr 7 - Mon, Apr 27

9:25 am - 9:30 am

SEA

ADL

29h 35m1 stop

2:55 pm - 12:59 am

ADL

SEA

28h 34m1 stop

$1,114United Airlines

Mon, Feb 9 - Mon, Feb 16

5:10 pm - 9:30 am

SEA

ADL

21h 50m1 stop

2:55 pm - 9:12 pm

ADL

SEA

24h 47m2 stops

$1,119United Airlines

Mon, Feb 9 - Mon, Feb 16

10:15 am - 5:10 am

SEA

PER

27h 55m1 stop

1:10 am - 8:45 am

PER

SEA

22h 35m1 stop

$1,148Singapore Airlines

Sat, May 2 - Wed, May 13

Hawaiian Airlines flights from Seattle to Australia

Our best Hawaiian Airlines deals on Seattle to Australia flight tickets

Hawaiian Airlines

Feb 4

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Feb 14

SYD9:40 pmSydney Kingsford Smith

21h 00m

1 stop

SEA11:40 pmSeattle/Tacoma Intl

$1,133

Find similar

Hawaiian Airlines

Feb 4

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Feb 15

SYD9:40 pmSydney Kingsford Smith

17h 46m

1 stop

SEA8:26 pmSeattle/Tacoma Intl

$1,135

Find similar

Hawaiian Airlines

Jan 4

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Jan 13

SYD9:40 pmSydney Kingsford Smith

18h 59m

2 stops

SEA9:39 pmSeattle/Tacoma Intl

$1,269

Find similar

Qantas Airways flights from Seattle to Australia

Our best Qantas Airways deals on Seattle to Australia flight tickets

Qantas Airways

Feb 10

SEA5:53 pmSeattle/Tacoma Intl

28h 22m

2 stops

MEL5:15 pmMelbourne

Feb 17

MEL12:00 pmMelbourne

25h 57m

1 stop

SEA6:57 pmSeattle/Tacoma Intl

$977

Find similar

Qantas Airways

Feb 21

SEA12:50 pmSeattle/Tacoma Intl

25h 40m

1 stop

MEL9:30 amMelbourne

Mar 7

MEL12:00 pmMelbourne

25h 53m

1 stop

SEA6:53 pmSeattle/Tacoma Intl

$979

Find similar

Qantas Airways

Jan 6

SEA6:00 amSeattle/Tacoma Intl

32h 30m

1 stop

MEL9:30 amMelbourne

Jan 20

MEL12:00 pmMelbourne

25h 05m

1 stop

SEA6:05 pmSeattle/Tacoma Intl

$1,077

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 2/9

9:55 am-8:45 am

1 stop28h 50m

Brisbane

Sun 2/22

10:45 am-2:31 pm

1 stop21h 46m

$796

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 2/19

3:40 pm-8:45 am

1 stop23h 05m

Brisbane

Wed 3/4

10:45 am-9:31 am

1 stop16h 46m

$797

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Thu 2/19

3:40 pm-2:20 pm

2 stops28h 40m

Brisbane

Wed 3/4

10:45 am-3:01 pm

1 stop22h 16m

$813

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 2/16

3:40 pm-8:45 am

1 stop23h 05m

Brisbane

Wed 2/25

6:10 am-9:15 am

2 stops21h 05m

$814

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/13

3:50 pm-7:25 am

1 stop20h 35m

Sydney Kingsford Smith

Sat 2/28

5:45 pm-6:57 pm

1 stop20h 12m

$1,085

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/27

6:01 am-10:55 am

2 stops33h 54m

Sydney Kingsford Smith

Sun 3/22

11:20 am-8:42 pm

1 stop27h 22m

$1,093

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

$1,105

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Mon 2/9

9:25 am-9:30 am

1 stop29h 35m

Adelaide

Mon 2/16

2:55 pm-12:59 am

1 stop28h 34m

$1,114

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-9:12 pm

2 stops24h 47m

$1,119

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Sat 5/2

10:15 am-5:10 am

1 stop27h 55m

Perth

Wed 5/13

1:10 am-8:45 am

1 stop22h 35m

$1,148

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 $878.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from Seattle in the evening is the least expensive time of day to depart. momondo users have found prices as low as $1,078 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,152 on average. Flights to Australia from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $1,069 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 $877 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	18h 00m
Direct flights	None

The fastest flight from Seattle to Australia takes 18h 00m

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 December 2025, 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 11,547 reviews	Search Alaska Airlines flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,049 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 957 reviews	Search Qantas Airways flights
Philippine Airlines	PriceFrom $758	Free Cancellation	Rating 7.3 942 reviews	Search Philippine Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,562 reviews	Search Air Canada flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,069 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,819 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $830	Free Cancellation	Rating 7.4 9,116 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,021 reviews	Search Delta flights
Singapore Airlines	PriceFrom $1,265	Free Cancellation	Rating 8.1 1,421 reviews	Search Singapore 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.