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 40% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 10 different airlines that fly to Australia on a routine basis, so you have a few additional options to choose from.

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

Cathay Pacific, Qantas Airways, and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl 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 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.

$393 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.

3:40 pm - 7:05 am

SEA

BNE

22h 25m

1 stop

10:00 am - 7:20 pm

BNE

SEA

26h 20m

1 stop

$845Air Canada

Wed, Apr 8 - Tue, Apr 21

3:40 pm - 7:05 am

SEA

BNE

22h 25m

1 stop

10:00 am - 9:38 am

BNE

SEA

16h 38m

1 stop

$846Air Canada

Tue, Apr 14 - Tue, Apr 21

10:20 am - 7:05 am

SEA

BNE

27h 45m

1 stop

10:00 am - 7:20 pm

BNE

SEA

26h 20m

1 stop

$847Air Canada

Mon, Apr 13 - Mon, Apr 20

2:57 pm - 7:05 am

SEA

SYD

23h 08m

2 stops

9:10 am - 6:07 pm

SYD

SEA

25h 57m

1 stop

$876American Airlines

Sun, Apr 12 - Sun, Apr 26

6:40 pm - 7:05 am

SEA

SYD

19h 25m

1 stop

9:10 am - 10:58 pm

SYD

SEA

30h 48m

1 stop

$877American Airlines

Sun, Apr 12 - Sun, Apr 26

5:20 pm - 6:55 am

SEA

SYD

20h 35m

1 stop

10:20 am - 12:34 pm

SYD

SEA

19h 14m

1 stop

$894United Airlines

Wed, May 27 - Mon, Jun 29

12:54 pm - 7:00 am

SEA

SYD

25h 06m

2 stops

9:30 am - 9:46 pm

SYD

SEA

29h 16m

1 stop

$895United Airlines

Sun, Apr 12 - Sun, Apr 26

10:00 am - 11:45 am

SEA

MCY

32h 45m

2 stops

12:30 pm - 3:50 pm

MCY

SEA

44h 20m

2 stops

$1,267Qantas Airways

Tue, Apr 14 - Tue, Apr 21

5:55 pm - 4:35 pm

SEA

LST

29h 40m

3 stops

3:40 pm - 1:03 pm

LST

SEA

38h 23m

2 stops

$1,323Qantas Airways

Tue, Apr 21 - Tue, May 26

4:30 pm - 3:50 pm

SEA

ADL

30h 50m

1 stop

6:20 pm - 12:45 pm

ADL

SEA

34h 55m

2 stops

$1,575Qatar Airways

Tue, Apr 14 - Tue, Apr 21

Cathay Pacific flights from Seattle to Australia

Our best Cathay Pacific deals on Seattle to Australia flight tickets

Cathay Pacific

Aug 17

SEA12:25 pmSeattle/Tacoma Intl

43h 15m

1 stop

PER10:40 pmPerth

Sep 14

PER8:20 amPerth

41h 00m

1 stop

SEA10:20 amSeattle/Tacoma Intl

$977

Cathay Pacific

Aug 17

SEA12:25 pmSeattle/Tacoma Intl

43h 15m

1 stop

PER10:40 pmPerth

Sep 13

PER12:10 amPerth

25h 10m

1 stop

SEA10:20 amSeattle/Tacoma Intl

$979

Cathay Pacific

Apr 7

SEA11:45 amSeattle/Tacoma Intl

28h 05m

1 stop

PER6:50 amPerth

Apr 27

PER12:10 amPerth

24h 55m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$981

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

Apr 30

SEA4:36 pmSeattle/Tacoma Intl

21h 14m

2 stops

SYD6:50 amSydney Kingsford Smith

May 17

SYD9:15 amSydney Kingsford Smith

24h 29m

2 stops

SEA4:44 pmSeattle/Tacoma Intl

$948

Delta

Apr 18

SEA5:59 pmSeattle/Tacoma Intl

19h 51m

1 stop

SYD6:50 amSydney Kingsford Smith

May 11

SYD9:15 amSydney Kingsford Smith

18h 40m

1 stop

SEA10:55 amSeattle/Tacoma Intl

$949

Delta

Apr 18

SEA1:30 pmSeattle/Tacoma Intl

24h 20m

2 stops

SYD6:50 amSydney Kingsford Smith

May 11

SYD9:15 amSydney Kingsford Smith

24h 38m

1 stop

SEA4:53 pmSeattle/Tacoma Intl

$950

Fly from

Fly to

Route

Depart

Return

Price

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 4/8

3:40 pm-7:05 am

1 stop22h 25m

Brisbane

Tue 4/21

10:00 am-7:20 pm

1 stop26h 20m

$845

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 4/14

3:40 pm-7:05 am

1 stop22h 25m

Brisbane

Tue 4/21

10:00 am-9:38 am

1 stop16h 38m

$846

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Mon 4/13

10:20 am-7:05 am

1 stop27h 45m

Brisbane

Mon 4/20

10:00 am-7:20 pm

1 stop26h 20m

$847

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/12

2:57 pm-7:05 am

2 stops23h 08m

Sydney Kingsford Smith

Sun 4/26

9:10 am-6:07 pm

1 stop25h 57m

$876

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/12

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Sun 4/26

9:10 am-10:58 pm

1 stop30h 48m

$877

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/27

5:20 pm-6:55 am

1 stop20h 35m

Sydney Kingsford Smith

Mon 6/29

10:20 am-12:34 pm

1 stop19h 14m

$894

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/12

12:54 pm-7:00 am

2 stops25h 06m

Sydney Kingsford Smith

Sun 4/26

9:30 am-9:46 pm

1 stop29h 16m

$895

SeattleMaroochydore

SEA - MCY

SEAMCY

Seattle/Tacoma Intl

Tue 4/14

10:00 am-11:45 am

2 stops32h 45m

Maroochydore Sunshine Coast

Tue 4/21

12:30 pm-3:50 pm

2 stops44h 20m

$1,267

SeattleLaunceston

SEA - LST

SEALST

Seattle/Tacoma Intl

Tue 4/21

5:55 pm-4:35 pm

3 stops29h 40m

Launceston

Tue 5/26

3:40 pm-1:03 pm

2 stops38h 23m

$1,323

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 4/14

4:30 pm-3:50 pm

1 stop30h 50m

Adelaide

Tue 4/21

6:20 pm-12:45 pm

2 stops34h 55m

$1,575

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 February instead. Flights to Australia in February, while not as cheap as those in August, still average around $848.

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 $1,065 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.

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	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 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 8.0 11,974 reviews	Search Alaska Airlines flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,107 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,000 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,767 reviews	Search Air Canada flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,369 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,375 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,237 reviews	Search Delta flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	Search Alaska Airlines flights
Singapore Airlines	PriceFrom $1,218	Free Cancellation	Rating 8.2 1,465 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.