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 New Zealand, United Airlines, and Delta 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.

$478 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.

11:10 pm - 8:00 am

SEA

SYD

39h 50m

1 stop

10:15 am - 8:05 pm

SYD

SEA

26h 50m

1 stop

$885Philippine Airlines

Fri, Sep 4 - Sun, Sep 13

11:21 am - 11:50 am

SEA

SYD

31h 29m

2 stops

1:20 pm - 10:06 am

SYD

SEA

37h 46m

3 stops

$947Multiple Airlines

Wed, May 27 - Wed, Jun 3

6:10 am - 7:05 am

SEA

SYD

31h 55m

1 stop

12:00 pm - 4:44 pm

SYD

SEA

21h 44m

1 stop

$970American Airlines

Sun, May 10 - Sun, May 24

2:57 pm - 7:05 am

SEA

SYD

23h 08m

2 stops

9:10 am - 4:44 pm

SYD

SEA

24h 34m

2 stops

$971American Airlines

Sun, May 10 - Sun, May 24

5:25 pm - 8:15 am

SEA

MEL

21h 50m

1 stop

9:30 am - 3:51 pm

MEL

SEA

23h 21m

1 stop

$1,092United Airlines

Wed, May 6 - Sun, May 17

12:51 pm - 7:30 am

SEA

MEL

25h 39m

2 stops

10:55 am - 9:06 pm

MEL

SEA

27h 11m

2 stops

$1,096United Airlines

Fri, May 1 - Sat, May 9

9:20 pm - 7:50 am

SEA

MEL

41h 30m

1 stop

10:00 am - 12:21 pm

MEL

SEA

19h 21m

1 stop

$1,107Delta

Sun, May 24 - Fri, Jun 5

7:20 pm - 7:05 am

SEA

BNE

18h 45m

1 stop

10:00 am - 2:22 pm

BNE

SEA

21h 22m

1 stop

$1,155Air Canada

Sat, Aug 1 - Wed, Aug 12

5:28 pm - 11:55 am

SEA

ADL

25h 57m

2 stops

1:20 pm - 9:58 pm

ADL

SEA

25h 08m

2 stops

$1,242Qantas Airways

Fri, Jun 5 - Tue, Jun 16

2:40 pm - 10:35 pm

SEA

ADL

39h 25m

2 stops

1:15 pm - 9:58 pm

ADL

SEA

25h 13m

2 stops

$1,324Qantas Airways

Sun, Jun 7 - Tue, Jun 23

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets

Delta

May 10

SEA10:50 amSeattle/Tacoma Intl

27h 00m

2 stops

SYD6:50 amSydney Kingsford Smith

May 20

SYD9:15 amSydney Kingsford Smith

23h 08m

2 stops

SEA3:23 pmSeattle/Tacoma Intl

$986

Delta

Jul 28

SEA5:25 amSeattle/Tacoma Intl

32h 25m

2 stops

SYD6:50 amSydney Kingsford Smith

Aug 11

SYD9:15 amSydney Kingsford Smith

22h 30m

2 stops

SEA2:45 pmSeattle/Tacoma Intl

$1,006

Delta

May 12

SEA9:25 amSeattle/Tacoma Intl

28h 25m

2 stops

SYD6:50 amSydney Kingsford Smith

May 23

SYD9:15 amSydney Kingsford Smith

29h 48m

2 stops

SEA10:03 pmSeattle/Tacoma Intl

$1,019

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

Jun 10

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Jun 15

SYD9:20 amSydney Kingsford Smith

22h 03m

1 stop

SEA2:23 pmSeattle/Tacoma Intl

$1,064

Air Canada

Jun 5

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Jul 6

SYD9:20 amSydney Kingsford Smith

17h 47m

1 stop

SEA10:07 amSeattle/Tacoma Intl

$1,074

Air Canada

Aug 1

SEA7:20 pmSeattle/Tacoma Intl

18h 45m

1 stop

BNE7:05 amBrisbane

Aug 12

BNE10:00 amBrisbane

21h 22m

1 stop

SEA2:22 pmSeattle/Tacoma Intl

$1,155

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 9/4

11:10 pm-8:00 am

1 stop39h 50m

Sydney Kingsford Smith

Sun 9/13

10:15 am-8:05 pm

1 stop26h 50m

$885

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/27

11:21 am-11:50 am

2 stops31h 29m

Sydney Kingsford Smith

Wed 6/3

1:20 pm-10:06 am

3 stops37h 46m

$947

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/10

6:10 am-7:05 am

1 stop31h 55m

Sydney Kingsford Smith

Sun 5/24

12:00 pm-4:44 pm

1 stop21h 44m

$970

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/10

2:57 pm-7:05 am

2 stops23h 08m

Sydney Kingsford Smith

Sun 5/24

9:10 am-4:44 pm

2 stops24h 34m

$971

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 5/6

5:25 pm-8:15 am

1 stop21h 50m

Melbourne

Sun 5/17

9:30 am-3:51 pm

1 stop23h 21m

$1,092

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 5/1

12:51 pm-7:30 am

2 stops25h 39m

Melbourne

Sat 5/9

10:55 am-9:06 pm

2 stops27h 11m

$1,096

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 5/24

9:20 pm-7:50 am

1 stop41h 30m

Melbourne

Fri 6/5

10:00 am-12:21 pm

1 stop19h 21m

$1,107

Quickest round-trip

SeattleBrisbane

SEA - BNE

SEABNE

Seattle/Tacoma Intl

Sat 8/1

7:20 pm-7:05 am

1 stop18h 45m

Brisbane

Wed 8/12

10:00 am-2:22 pm

1 stop21h 22m

$1,155

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Fri 6/5

5:28 pm-11:55 am

2 stops25h 57m

Adelaide

Tue 6/16

1:20 pm-9:58 pm

2 stops25h 08m

$1,242

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Sun 6/7

2:40 pm-10:35 pm

2 stops39h 25m

Adelaide

Tue 6/23

1:15 pm-9:58 pm

2 stops25h 13m

$1,324

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 45m
Direct flights	None

The fastest flight from Seattle to Australia takes 18h 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 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 12,260 reviews	Search Alaska Airlines flights
Delta	PriceFrom $237	Free Cancellation	Rating 7.9 8,424 reviews	Search Delta flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 10,939 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,179 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,020 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,617 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,605 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 630 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.