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 39% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 12 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?

Qantas Airways, American Airlines, 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 September 2026, there are 12 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.

$491 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.

3:00 pm - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:20 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$848Air Canada

Tue, Oct 20 - Tue, Oct 27

3:00 pm - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:20 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$849Air Canada

Tue, Oct 20 - Tue, Oct 27

8:09 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 16m1 stop Los Angeles Los Angeles

2:00 pm - 6:54 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 54m2 stops Nadi Los Angeles Los Angeles

$860Multiple Airlines

Sat, Nov 7 - Tue, Nov 10

8:09 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 16m1 stop Los Angeles Los Angeles

2:00 pm - 6:54 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 54m2 stops Nadi Los Angeles Los Angeles

$880Multiple Airlines

Thu, Oct 29 - Mon, Nov 9

7:05 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 am - 9:27 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 07m1 stop Vancouver Intl

$1,000Air New Zealand

Wed, Feb 10 - Mon, Feb 22

7:05 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 am - 9:27 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 07m1 stop Vancouver Intl

$1,000Air New Zealand

Mon, Feb 8 - Mon, Feb 22

5:55 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 05m1 stop Los Angeles Los Angeles

11:20 am - 2:42 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 22m1 stop Los Angeles Los Angeles

$1,054Qantas Airways

Wed, Feb 17 - Wed, Mar 3

4:45 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

18h 40m1 stop San Francisco

11:20 am - 2:42 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 22m1 stop Los Angeles Los Angeles

$1,057Qantas Airways

Wed, Feb 17 - Wed, Mar 3

1:37 pm - 9:15 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 38m2 stops Los Angeles Los Angeles Brisbane

11:10 am - 7:44 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 34m2 stops Los Angeles Los Angeles Dallas/Fort Worth

$1,072American Airlines

Tue, Oct 20 - Tue, Oct 27

3:30 pm - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 00m2 stops Phoenix Sky Harbor Intl Los Angeles Los Angeles

11:10 am - 3:09 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 59m2 stops Los Angeles Los Angeles Sacramento Intl

$1,093American Airlines

Tue, Oct 20 - Tue, Oct 27

Cheap last minute flights

Enter your travel dates to find the best prices.

7:15 pm - 11:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 25m2 stops Vancouver Intl Brisbane

9:20 am - 6:32 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$923Air Canada

Sun, Sep 13 - Sun, Sep 20

10:50 am - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

9:20 am - 6:32 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$980Air Canada

Sun, Sep 13 - Sun, Sep 20

3:00 pm - 7:05 amSEA Seattle/Tacoma Intl-BNE Brisbane

23h 05m1 stop Vancouver Intl

8:40 pm - 10:05 amBNE Brisbane-SEA Seattle/Tacoma Intl

30h 25m2 stops Sydney Kingsford Smith Vancouver Intl

$1,002Multiple Airlines

Sat, Sep 12 - Mon, Sep 28

7:20 am - 11:25 pmSEA Seattle/Tacoma Intl-BNE Brisbane

23h 05m2 stops Honolulu Sydney Kingsford Smith

8:50 pm - 11:50 pmBNE Brisbane-SEA Seattle/Tacoma Intl

44h 00m2 stops Sydney Kingsford Smith Honolulu

$1,154Multiple Airlines

Sat, Sep 12 - Mon, Sep 28

3:00 pm - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

9:20 am - 6:32 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,170Air New Zealand

Thu, Sep 10 - Tue, Sep 22

12:25 pm - 5:55 amSEA Seattle/Tacoma Intl-MEL Melbourne

24h 30m1 stop Hong Kong Intl

7:25 am - 6:32 pmMEL Melbourne-SEA Seattle/Tacoma Intl

28h 07m2 stops Hong Kong Intl Vancouver Intl

$1,402Cathay Pacific

Thu, Sep 10 - Thu, Sep 17

4:25 pm - 4:50 pmSEA Seattle/Tacoma Intl-MEL Melbourne

31h 25m1 stop Doha Hamad Intl

10:45 pm - 1:05 pmMEL Melbourne-SEA Seattle/Tacoma Intl

31h 20m1 stop Doha Hamad Intl

$1,497Qatar Airways

Thu, Sep 10 - Thu, Sep 17

6:49 am - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 41m1 stop Los Angeles Los Angeles

5:50 pm - 10:39 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 49m2 stops Los Angeles Los Angeles Portland

$1,599Alaska Airlines

Sun, Sep 13 - Tue, Sep 15

5:40 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 10m1 stop Los Angeles Los Angeles

9:15 am - 12:27 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 12m1 stop Los Angeles Los Angeles

$1,644Delta

Fri, Sep 11 - Wed, Sep 23

9:00 am - 8:45 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

30h 45m2 stops San Francisco Auckland Intl

7:20 pm - 10:47 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

44h 27m2 stops Auckland Intl Vancouver Intl

$1,652Air New Zealand

Sun, Sep 13 - Tue, Sep 15

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Oct 20

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 27

SYD10:20 amSydney Kingsford Smith

22h 17m

1 stop

SEA2:37 pmSeattle/Tacoma Intl

$848

Air Canada

Oct 20

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 27

SYD10:20 amSydney Kingsford Smith

22h 17m

1 stop

SEA2:37 pmSeattle/Tacoma Intl

$849

Air Canada

Oct 20

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 27

SYD10:20 amSydney Kingsford Smith

22h 17m

1 stop

SEA2:37 pmSeattle/Tacoma Intl

$851

Air New Zealand flights from Seattle to Australia

Our best Air New Zealand deals on Seattle to Australia flight tickets

Air New Zealand

Sep 10

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 22

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,170

Air New Zealand

Jan 6

SEA6:29 amSeattle/Tacoma Intl

33h 26m

2 stops

MEL10:55 amMelbourne

Jan 23

MEL3:00 pmMelbourne

44h 09m

2 stops

SEA4:09 pmSeattle/Tacoma Intl

$1,190

Air New Zealand

Jan 5

SEA6:57 amSeattle/Tacoma Intl

32h 58m

2 stops

MEL10:55 amMelbourne

Jan 23

MEL7:10 pmMelbourne

57h 43m

2 stops

SEA9:53 amSeattle/Tacoma Intl

$1,199

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

3:00 pm-8:20 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 10/27

10:20 am-2:37 pm

1 stop22h 17m

$848

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

3:00 pm-8:20 am

1 stop23h 20m

Sydney Kingsford Smith

Tue 10/27

10:20 am-2:37 pm

1 stop22h 17m

$849

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 11/7

8:09 pm-6:25 am

1 stop39h 16m

Sydney Kingsford Smith

Tue 11/10

2:00 pm-6:54 pm

2 stops23h 54m

$860

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 10/29

8:09 pm-6:25 am

1 stop40h 16m

Sydney Kingsford Smith

Mon 11/9

2:00 pm-6:54 pm

2 stops23h 54m

$880

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/10

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Mon 2/22

11:20 am-9:27 am

1 stop17h 07m

$1,000

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/8

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Mon 2/22

11:20 am-9:27 am

1 stop17h 07m

$1,000

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/17

5:55 pm-9:00 am

1 stop20h 05m

Sydney Kingsford Smith

Wed 3/3

11:20 am-2:42 pm

1 stop22h 22m

$1,054

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 2/17

4:45 pm-6:25 am

1 stop18h 40m

Sydney Kingsford Smith

Wed 3/3

11:20 am-2:42 pm

1 stop22h 22m

$1,057

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

1:37 pm-9:15 am

2 stops25h 38m

Sydney Kingsford Smith

Tue 10/27

11:10 am-7:44 pm

2 stops26h 34m

$1,072

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 10/20

3:30 pm-7:30 am

2 stops22h 00m

Sydney Kingsford Smith

Tue 10/27

11:10 am-3:09 pm

2 stops21h 59m

$1,093

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 February is, on average, the cheapest month to fly to Australia from Seattle, with most prices found around $1,010. If you aren’t able to travel during the month of February, then book flights to Australia from Seattle during August instead. Flights to Australia in August, while not as cheap as those in February, still average around $1,045.

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 $1,140 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 $955 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 25% 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

Best Price Found	$491
Fastest flight time	18h 30m
Direct flights	None

The best one-way flight to Australia from Seattle in the past 72 hours is $491. The best round-trip flight deal from Seattle to Australia found on momondo in the last 72 hours is $848.

The fastest flight from Seattle to Australia takes 18h 30m

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 September 2026, there are 12 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 12,904 reviews	Search Alaska Airlines flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.8 8,553 reviews	Search Delta flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,312 reviews	Search ANA flights
Air Canada	PriceFrom $780	Free Cancellation	Rating 7.1 11,608 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,091 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,814 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $843	Free Cancellation	Rating 7.4 10,192 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 669 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $976	Free Cancellation	Rating 7.1 12,046 reviews	Search American Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,480 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.