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

United Airlines, Delta, and Qantas 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 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.

$432 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.

3:20 pm - 7:05 am

SEA

SYD

22h 45m

2 stops

5:50 pm - 11:21 pm

SYD

SEA

22h 31m

1 stop

$975American Airlines

Mon, Aug 3 - Sun, Aug 16

3:33 pm - 6:55 am

SEA

SYD

22h 22m

1 stop

10:20 am - 11:25 am

SYD

SEA

18h 05m

1 stop

$978Air New Zealand

Tue, Jul 28 - Tue, Aug 11

7:05 pm - 6:55 am

SEA

SYD

18h 50m

1 stop

10:20 am - 11:26 am

SYD

SEA

18h 06m

1 stop

$979Air New Zealand

Wed, Aug 5 - Wed, Aug 12

3:33 pm - 6:55 am

SEA

SYD

22h 22m

1 stop

9:30 am - 11:34 am

SYD

SEA

19h 04m

1 stop

$981United Airlines

Wed, Aug 5 - Wed, Aug 12

3:33 pm - 6:55 am

SEA

SYD

22h 22m

1 stop

9:30 am - 9:31 pm

SYD

SEA

29h 01m

2 stops

$988United Airlines

Tue, Jul 28 - Tue, Aug 11

12:36 pm - 7:50 am

SEA

MEL

26h 14m

1 stop

10:00 am - 8:30 pm

MEL

SEA

27h 30m

1 stop

$988Delta

Fri, Aug 14 - Fri, Aug 21

9:40 am - 7:50 am

SEA

MEL

29h 10m

2 stops

10:00 am - 6:44 pm

MEL

SEA

25h 44m

2 stops

$992Delta

Fri, Aug 14 - Fri, Aug 21

5:50 am - 11:35 am

SEA

CBR

36h 45m

2 stops

6:20 am - 6:32 pm

CBR

SEA

29h 12m

2 stops

$1,358Air Canada

Thu, Aug 20 - Tue, Aug 25

7:10 pm - 1:40 pm

SEA

CNS

25h 30m

2 stops

1:55 pm - 1:39 pm

CNS

SEA

40h 44m

3 stops

$1,725Qantas Airways

Sun, Sep 20 - Mon, Sep 28

12:57 pm - 12:00 pm

SEA

HBA

28h 03m

2 stops

10:10 am - 12:04 am

HBA

SEA

32h 54m

2 stops

$1,998Qantas Airways

Sun, Nov 1 - Thu, Nov 5

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Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Aug 3

SEA10:40 amSeattle/Tacoma Intl

27h 40m

1 stop

SYD7:20 amSydney Kingsford Smith

Aug 16

SYD9:20 amSydney Kingsford Smith

17h 45m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$1,001

Air Canada

Sep 20

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Oct 27

SYD10:20 amSydney Kingsford Smith

16h 57m

1 stop

SEA9:17 amSeattle/Tacoma Intl

$1,054

Air Canada

Sep 13

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Oct 14

SYD7:30 amSydney Kingsford Smith

20h 22m

2 stops

SEA9:52 amSeattle/Tacoma Intl

$1,069

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

Aug 14

SEA12:36 pmSeattle/Tacoma Intl

26h 14m

1 stop

MEL7:50 amMelbourne

Aug 21

MEL10:00 amMelbourne

27h 30m

1 stop

SEA8:30 pmSeattle/Tacoma Intl

$988

Delta

Aug 14

SEA9:40 amSeattle/Tacoma Intl

29h 10m

2 stops

MEL7:50 amMelbourne

Aug 21

MEL10:00 amMelbourne

25h 44m

2 stops

SEA6:44 pmSeattle/Tacoma Intl

$992

Delta

Aug 1

SEA8:25 pmSeattle/Tacoma Intl

41h 25m

1 stop

SYD6:50 amSydney Kingsford Smith

Aug 18

SYD9:15 amSydney Kingsford Smith

20h 12m

1 stop

SEA12:27 pmSeattle/Tacoma Intl

$995

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

3:20 pm-7:05 am

2 stops22h 45m

Sydney Kingsford Smith

Sun 8/16

5:50 pm-11:21 pm

1 stop22h 31m

$975

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

3:33 pm-6:55 am

1 stop22h 22m

Sydney Kingsford Smith

Tue 8/11

10:20 am-11:25 am

1 stop18h 05m

$978

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 8/5

7:05 pm-6:55 am

1 stop18h 50m

Sydney Kingsford Smith

Wed 8/12

10:20 am-11:26 am

1 stop18h 06m

$979

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 8/5

3:33 pm-6:55 am

1 stop22h 22m

Sydney Kingsford Smith

Wed 8/12

9:30 am-11:34 am

1 stop19h 04m

$981

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

3:33 pm-6:55 am

1 stop22h 22m

Sydney Kingsford Smith

Tue 8/11

9:30 am-9:31 pm

2 stops29h 01m

$988

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 8/14

12:36 pm-7:50 am

1 stop26h 14m

Melbourne

Fri 8/21

10:00 am-8:30 pm

1 stop27h 30m

$988

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 8/14

9:40 am-7:50 am

2 stops29h 10m

Melbourne

Fri 8/21

10:00 am-6:44 pm

2 stops25h 44m

$992

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Thu 8/20

5:50 am-11:35 am

2 stops36h 45m

Canberra

Tue 8/25

6:20 am-6:32 pm

2 stops29h 12m

$1,358

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Sun 9/20

7:10 pm-1:40 pm

2 stops25h 30m

Cairns

Mon 9/28

1:55 pm-1:39 pm

3 stops40h 44m

$1,725

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Sun 11/1

12:57 pm-12:00 pm

2 stops28h 03m

Hobart

Thu 11/5

10:10 am-12:04 am

2 stops32h 54m

$1,998

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 January is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $97. If you aren’t able to travel during the month of January, then book flights to Australia from Seattle during February instead. Flights to Australia in February, while not as cheap as those in January, still average around $142.

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 $1,075 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 29% 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

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 12,606 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,287 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,260 reviews	Search ANA flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 1,056 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,768 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,825 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $831	Free Cancellation	Rating 7.4 9,926 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,452 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 649 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,402 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.