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

Delta, American Airlines, and United 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 June 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.

$399 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.

10:45 am - 10:30 am

SEA

MEL

28h 45m

1 stop

11:30 am - 11:33 am

MEL

SEA

19h 03m

1 stop

$982United Airlines

Sun, Nov 22 - Mon, Dec 7

7:00 am - 10:30 am

SEA

MEL

32h 30m

2 stops

12:45 pm - 12:12 pm

MEL

SEA

18h 27m

1 stop

$987United Airlines

Sun, Nov 22 - Tue, Dec 8

12:35 pm - 6:50 am

SEA

SYD

25h 15m

1 stop

9:15 am - 12:27 pm

SYD

SEA

20h 12m

1 stop

$988Delta

Tue, Jul 28 - Tue, Aug 11

5:50 pm - 7:50 am

SEA

MEL

21h 00m

1 stop

10:00 am - 8:30 pm

MEL

SEA

27h 30m

1 stop

$989Delta

Mon, Aug 17 - Wed, Aug 26

5:50 pm - 6:50 am

SEA

SYD

20h 00m

1 stop

9:15 am - 2:50 pm

SYD

SEA

22h 35m

1 stop

$989Delta

Sun, Aug 2 - Sun, Aug 9

7:20 pm - 6:10 pm

SEA

ADL

30h 20m

2 stops

6:55 pm - 2:22 pm

ADL

SEA

35h 57m

2 stops

$1,301Air Canada

Sun, Aug 2 - Mon, Aug 17

5:10 pm - 1:45 pm

SEA

CNS

27h 35m

2 stops

6:50 am - 11:21 pm

CNS

SEA

33h 31m

2 stops

$1,401Qantas Airways

Tue, Sep 1 - Tue, Sep 8

5:22 pm - 12:55 pm

SEA

CNS

26h 33m

2 stops

5:25 pm - 7:39 pm

CNS

SEA

43h 14m

2 stops

$1,421Qantas Airways

Mon, Aug 31 - Mon, Sep 7

7:20 pm - 11:10 am

SEA

CNS

22h 50m

2 stops

6:00 am - 2:22 pm

CNS

SEA

25h 22m

2 stops

$1,433Air Canada

Sun, Aug 30 - Tue, Sep 8

3:00 pm - 2:55 pm

SEA

CBR

30h 55m

3 stops

7:15 pm - 9:51 pm

CBR

SEA

43h 36m

3 stops

$1,637Air New Zealand

Sun, Aug 9 - Sun, Aug 16

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United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets

United Airlines

Nov 22

SEA1:16 pmSeattle/Tacoma Intl

26h 14m

1 stop

MEL10:30 amMelbourne

Dec 6

MEL11:30 amMelbourne

19h 03m

1 stop

SEA11:33 amSeattle/Tacoma Intl

$982

United Airlines

Nov 22

SEA7:00 amSeattle/Tacoma Intl

32h 30m

2 stops

MEL10:30 amMelbourne

Dec 8

MEL12:45 pmMelbourne

18h 27m

1 stop

SEA12:12 pmSeattle/Tacoma Intl

$987

United Airlines

Nov 22

SEA3:27 pmSeattle/Tacoma Intl

24h 03m

1 stop

MEL10:30 amMelbourne

Dec 9

MEL8:40 amMelbourne

20h 41m

2 stops

SEA10:21 amSeattle/Tacoma Intl

$999

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Oct 11

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 18

SYD10:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,048

Air Canada

Jul 5

SEA5:45 amSeattle/Tacoma Intl

32h 35m

1 stop

SYD7:20 amSydney Kingsford Smith

Jul 19

SYD9:20 amSydney Kingsford Smith

17h 47m

1 stop

SEA10:07 amSeattle/Tacoma Intl

$1,050

Air Canada

Sep 20

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Oct 5

SYD10:20 amSydney Kingsford Smith

17h 32m

1 stop

SEA9:52 amSeattle/Tacoma Intl

$1,054

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 11/22

10:45 am-10:30 am

1 stop28h 45m

Melbourne

Mon 12/7

11:30 am-11:33 am

1 stop19h 03m

$982

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 11/22

7:00 am-10:30 am

2 stops32h 30m

Melbourne

Tue 12/8

12:45 pm-12:12 pm

1 stop18h 27m

$987

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

12:35 pm-6:50 am

1 stop25h 15m

Sydney Kingsford Smith

Tue 8/11

9:15 am-12:27 pm

1 stop20h 12m

$988

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Mon 8/17

5:50 pm-7:50 am

1 stop21h 00m

Melbourne

Wed 8/26

10:00 am-8:30 pm

1 stop27h 30m

$989

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/2

5:50 pm-6:50 am

1 stop20h 00m

Sydney Kingsford Smith

Sun 8/9

9:15 am-2:50 pm

1 stop22h 35m

$989

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 8/2

7:20 pm-6:10 pm

2 stops30h 20m

Adelaide

Mon 8/17

6:55 pm-2:22 pm

2 stops35h 57m

$1,301

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Tue 9/1

5:10 pm-1:45 pm

2 stops27h 35m

Cairns

Tue 9/8

6:50 am-11:21 pm

2 stops33h 31m

$1,401

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Mon 8/31

5:22 pm-12:55 pm

2 stops26h 33m

Cairns

Mon 9/7

5:25 pm-7:39 pm

2 stops43h 14m

$1,421

SeattleCairns

SEA - CNS

SEACNS

Seattle/Tacoma Intl

Sun 8/30

7:20 pm-11:10 am

2 stops22h 50m

Cairns

Tue 9/8

6:00 am-2:22 pm

2 stops25h 22m

$1,433

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Sun 8/9

3:00 pm-2:55 pm

3 stops30h 55m

Canberra

Sun 8/16

7:15 pm-9:51 pm

3 stops43h 36m

$1,637

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 $1,067 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 $934 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 50m
Direct flights	None

The fastest flight from Seattle to Australia takes 17h 50m

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 June 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 12,582 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,269 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,258 reviews	Search ANA flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 1,053 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,777 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,826 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $831	Free Cancellation	Rating 7.4 9,901 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,455 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 646 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,394 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.