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

Air Canada, Qatar Airways, 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 12 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 March 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.

$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.

7:59 pm - 6:50 am

SEA

SYD

41h 51m

1 stop

9:15 am - 6:26 pm

SYD

SEA

26h 11m

1 stop

$878Delta

Mon, Apr 13 - Mon, Apr 27

11:40 am - 6:50 am

SEA

SYD

26h 10m

1 stop

9:15 am - 12:23 pm

SYD

SEA

20h 08m

1 stop

$881Delta

Sun, Apr 19 - Wed, May 13

8:00 pm - 7:20 am

SEA

SYD

18h 20m

1 stop

9:20 am - 10:05 am

SYD

SEA

17h 45m

1 stop

$916Air Canada

Sun, Apr 19 - Tue, May 5

2:55 pm - 7:05 am

SEA

BNE

23h 10m

1 stop

10:15 am - 6:30 pm

BNE

SEA

25h 15m

1 stop

$918Air Canada

Tue, May 12 - Tue, May 19

10:15 am - 5:10 am

SEA

PER

27h 55m

1 stop

4:55 pm - 8:45 am

PER

SEA

30h 50m

1 stop

$1,158Singapore Airlines

Thu, Sep 3 - Sat, Oct 3

10:15 am - 12:30 pm

SEA

PER

35h 15m

1 stop

4:55 pm - 8:45 am

PER

SEA

30h 50m

1 stop

$1,159Singapore Airlines

Thu, Sep 3 - Sat, Oct 3

1:21 pm - 1:15 pm

SEA

CBR

30h 54m

2 stops

8:10 am - 6:32 pm

CBR

SEA

27h 22m

2 stops

$1,569United Airlines

Thu, May 7 - Thu, May 14

7:36 pm - 11:55 am

SEA

HBA

23h 19m

2 stops

6:25 am - 9:06 pm

HBA

SEA

31h 41m

3 stops

$1,587United Airlines

Sun, May 10 - Sun, May 17

7:06 pm - 9:25 pm

SEA

HBA

57h 19m

2 stops

6:05 am - 10:58 pm

HBA

SEA

33h 53m

2 stops

$1,669Qantas Airways

Sat, May 9 - Wed, May 13

7:06 pm - 5:25 pm

SEA

HBA

53h 19m

2 stops

6:05 am - 10:58 pm

HBA

SEA

33h 53m

2 stops

$1,778Qantas Airways

Sat, May 9 - Wed, May 13

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

Apr 19

SEA11:40 amSeattle/Tacoma Intl

26h 10m

1 stop

SYD6:50 amSydney Kingsford Smith

May 11

SYD9:15 amSydney Kingsford Smith

18h 40m

1 stop

SEA10:55 amSeattle/Tacoma Intl

$881

Delta

Apr 19

SEA1:45 pmSeattle/Tacoma Intl

24h 05m

1 stop

SYD6:50 amSydney Kingsford Smith

May 11

SYD9:15 amSydney Kingsford Smith

24h 29m

2 stops

SEA4:44 pmSeattle/Tacoma Intl

$886

Delta

Apr 18

SEA1:45 pmSeattle/Tacoma Intl

24h 05m

1 stop

SYD6:50 amSydney Kingsford Smith

May 11

SYD9:15 amSydney Kingsford Smith

28h 15m

1 stop

SEA8:30 pmSeattle/Tacoma Intl

$914

American Airlines flights from Seattle to Australia

Our best American Airlines deals on Seattle to Australia flight tickets

American Airlines

Jun 1

SEA2:40 pmSeattle/Tacoma Intl

23h 25m

1 stop

SYD7:05 amSydney Kingsford Smith

Jun 29

SYD5:50 pmSydney Kingsford Smith

20h 59m

1 stop

SEA9:49 pmSeattle/Tacoma Intl

$976

American Airlines

Aug 9

SEA3:42 pmSeattle/Tacoma Intl

22h 13m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 31

SYD5:30 pmSydney Kingsford Smith

21h 02m

2 stops

SEA9:32 pmSeattle/Tacoma Intl

$997

American Airlines

Apr 6

SEA6:00 amSeattle/Tacoma Intl

30h 00m

1 stop

BNE5:00 amBrisbane

Apr 16

BNE8:35 pmBrisbane

19h 23m

1 stop

SEA10:58 pmSeattle/Tacoma Intl

$1,251

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/13

7:59 pm-6:50 am

1 stop41h 51m

Sydney Kingsford Smith

Mon 4/27

9:15 am-6:26 pm

1 stop26h 11m

$878

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

11:40 am-6:50 am

1 stop26h 10m

Sydney Kingsford Smith

Wed 5/13

9:15 am-12:23 pm

1 stop20h 08m

$881

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

8:00 pm-7:20 am

1 stop18h 20m

Sydney Kingsford Smith

Tue 5/5

9:20 am-10:05 am

1 stop17h 45m

$916

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Tue 5/12

2:55 pm-7:05 am

1 stop23h 10m

Brisbane

Tue 5/19

10:15 am-6:30 pm

1 stop25h 15m

$918

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Thu 9/3

10:15 am-5:10 am

1 stop27h 55m

Perth

Sat 10/3

4:55 pm-8:45 am

1 stop30h 50m

$1,158

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Thu 9/3

10:15 am-12:30 pm

1 stop35h 15m

Perth

Sat 10/3

4:55 pm-8:45 am

1 stop30h 50m

$1,159

SeattleCanberra

SEA - CBR

SEACBR

Seattle/Tacoma Intl

Thu 5/7

1:21 pm-1:15 pm

2 stops30h 54m

Canberra

Thu 5/14

8:10 am-6:32 pm

2 stops27h 22m

$1,569

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Sun 5/10

7:36 pm-11:55 am

2 stops23h 19m

Hobart

Sun 5/17

6:25 am-9:06 pm

3 stops31h 41m

$1,587

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Sat 5/9

7:06 pm-9:25 pm

2 stops57h 19m

Hobart

Wed 5/13

6:05 am-10:58 pm

2 stops33h 53m

$1,669

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Sat 5/9

7:06 pm-5:25 pm

2 stops53h 19m

Hobart

Wed 5/13

6:05 am-10:58 pm

2 stops33h 53m

$1,778

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 $824. 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 $857.

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 $1,071 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 $902 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 17% 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

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 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 12,134 reviews	Search Alaska Airlines flights
Delta	PriceFrom $237	Free Cancellation	Rating 7.9 8,357 reviews	Search Delta flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 10,853 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,148 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,013 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,520 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,839 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,500 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	Search Alaska Airlines flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,232 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.