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 13 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?

Air Canada 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 April 2026, there are 13 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.

$437 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.

6:40 pm - 7:30 am

SEA

SYD

19h 50m

1 stop

9:10 am - 6:07 pm

SYD

SEA

25h 57m

1 stop

$973American Airlines

Sun, May 3 - Sun, May 17

6:40 pm - 7:30 am

SEA

SYD

19h 50m

1 stop

9:10 am - 6:07 pm

SYD

SEA

25h 57m

1 stop

$975American Airlines

Sun, May 3 - Sun, May 17

5:59 pm - 6:50 am

SEA

SYD

19h 51m

1 stop

9:15 am - 8:28 pm

SYD

SEA

28h 13m

1 stop

$979Delta

Wed, Apr 29 - Wed, Jun 3

3:00 pm - 6:50 am

SEA

SYD

22h 50m

1 stop

9:15 am - 4:53 pm

SYD

SEA

24h 38m

1 stop

$981Delta

Mon, May 11 - Wed, May 27

5:45 am - 7:05 am

SEA

BNE

32h 20m

1 stop

10:00 am - 9:52 am

BNE

SEA

16h 52m

1 stop

$1,136Air Canada

Wed, Sep 2 - Wed, Sep 9

10:45 am - 7:05 am

SEA

BNE

27h 20m

1 stop

10:00 am - 6:32 pm

BNE

SEA

25h 32m

1 stop

$1,153Air Canada

Sat, Aug 1 - Wed, Aug 12

5:28 pm - 11:15 am

SEA

ADL

25h 17m

2 stops

1:15 pm - 9:49 pm

ADL

SEA

25h 04m

2 stops

$1,234Qantas Airways

Tue, May 26 - Tue, Jun 2

3:33 pm - 11:55 am

SEA

HBA

27h 22m

2 stops

6:25 am - 6:47 pm

HBA

SEA

29h 22m

2 stops

$1,349United Airlines

Sun, May 31 - Mon, Jun 8

5:30 am - 9:15 pm

SEA

ADL

23h 15m

2 stops

8:05 pm - 10:52 pm

ADL

SEA

43h 17m

2 stops

$1,350Qantas Airways

Sun, May 3 - Sun, May 10

3:33 pm - 12:25 pm

SEA

OOL

27h 52m

2 stops

6:00 am - 9:10 pm

OOL

SEA

32h 10m

3 stops

$1,357United Airlines

Wed, May 27 - Wed, Jun 3

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

Apr 29

SEA5:59 pmSeattle/Tacoma Intl

19h 51m

1 stop

SYD6:50 amSydney Kingsford Smith

Jun 3

SYD9:15 amSydney Kingsford Smith

28h 13m

1 stop

SEA8:28 pmSeattle/Tacoma Intl

$979

Delta

May 11

SEA3:00 pmSeattle/Tacoma Intl

22h 50m

1 stop

SYD6:50 amSydney Kingsford Smith

May 25

SYD9:15 amSydney Kingsford Smith

18h 40m

1 stop

SEA10:55 amSeattle/Tacoma Intl

$981

Delta

Apr 29

SEA9:50 amSeattle/Tacoma Intl

28h 00m

2 stops

SYD6:50 amSydney Kingsford Smith

Jun 3

SYD9:15 amSydney Kingsford Smith

18h 40m

1 stop

SEA10:55 amSeattle/Tacoma Intl

$984

American Airlines flights from Seattle to Australia

Our best American Airlines deals on Seattle to Australia flight tickets

American Airlines

May 3

SEA6:40 pmSeattle/Tacoma Intl

19h 50m

1 stop

SYD7:30 amSydney Kingsford Smith

May 17

SYD9:10 amSydney Kingsford Smith

25h 57m

1 stop

SEA6:07 pmSeattle/Tacoma Intl

$973

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

$975

American Airlines

Jun 1

SEA2:40 pmSeattle/Tacoma Intl

23h 25m

1 stop

SYD7:05 amSydney Kingsford Smith

Jun 29

SYD9:10 amSydney Kingsford Smith

21h 47m

1 stop

SEA1:57 pmSeattle/Tacoma Intl

$976

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/3

6:40 pm-7:30 am

1 stop19h 50m

Sydney Kingsford Smith

Sun 5/17

9:10 am-6:07 pm

1 stop25h 57m

$973

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/3

6:40 pm-7:30 am

1 stop19h 50m

Sydney Kingsford Smith

Sun 5/17

9:10 am-6:07 pm

1 stop25h 57m

$975

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 4/29

5:59 pm-6:50 am

1 stop19h 51m

Sydney Kingsford Smith

Wed 6/3

9:15 am-8:28 pm

1 stop28h 13m

$979

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/11

3:00 pm-6:50 am

1 stop22h 50m

Sydney Kingsford Smith

Wed 5/27

9:15 am-4:53 pm

1 stop24h 38m

$981

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Wed 9/2

5:45 am-7:05 am

1 stop32h 20m

Brisbane

Wed 9/9

10:00 am-9:52 am

1 stop16h 52m

$1,136

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 8/1

10:45 am-7:05 am

1 stop27h 20m

Brisbane

Wed 8/12

10:00 am-6:32 pm

1 stop25h 32m

$1,153

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Tue 5/26

5:28 pm-11:15 am

2 stops25h 17m

Adelaide

Tue 6/2

1:15 pm-9:49 pm

2 stops25h 04m

$1,234

SeattleHobart

SEA - HBA

SEAHBA

Seattle/Tacoma Intl

Sun 5/31

3:33 pm-11:55 am

2 stops27h 22m

Hobart

Mon 6/8

6:25 am-6:47 pm

2 stops29h 22m

$1,349

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 5/3

5:30 am-9:15 pm

2 stops23h 15m

Adelaide

Sun 5/10

8:05 pm-10:52 pm

2 stops43h 17m

$1,350

SeattleCoolangatta

SEA - OOL

SEAOOL

Seattle/Tacoma Intl

Wed 5/27

3:33 pm-12:25 pm

2 stops27h 52m

Coolangatta Gold Coast

Wed 6/3

6:00 am-9:10 pm

3 stops32h 10m

$1,357

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 $813. 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 $844.

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 $1,054 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 $900 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	18h 10m
Direct flights	None

The fastest flight from Seattle to Australia takes 18h 10m

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 April 2026, there are 13 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 12,233 reviews	Search Alaska Airlines flights
Delta	PriceFrom $237	Free Cancellation	Rating 7.9 8,408 reviews	Search Delta flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 10,922 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,171 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,018 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,571 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,838 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,581 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 626 reviews	Search Air New Zealand flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	Search Alaska 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.