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 35% 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?

American Airlines, Air New Zealand, 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 May 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.

$533 Cheap Flights from Seattle to Australia in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

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

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.

3:20 pm - 6:45 am

SEA

MEL

21h 25m

1 stop

11:15 pm - 8:57 am

MEL

SEA

27h 42m

1 stop

$996Multiple Airlines

Wed, Oct 21 - Wed, Oct 28

3:20 pm - 6:45 am

SEA

MEL

21h 25m

1 stop

3:25 pm - 9:25 pm

MEL

SEA

24h 00m

2 stops

$1,036Multiple Airlines

Wed, Oct 21 - Wed, Oct 28

7:20 pm - 7:20 am

SEA

SYD

19h 00m

1 stop

9:20 am - 10:40 pm

SYD

SEA

30h 20m

1 stop

$1,036Air Canada

Sun, Jun 7 - Sun, Jun 14

7:05 pm - 9:35 am

SEA

SYD

19h 30m

1 stop

11:20 am - 9:57 pm

SYD

SEA

29h 37m

1 stop

$1,043Air Canada

Wed, Nov 11 - Mon, Nov 30

3:20 pm - 6:45 am

SEA

MEL

21h 25m

1 stop

11:15 pm - 12:04 am

MEL

SEA

19h 49m

1 stop

$1,057Qantas Airways

Sun, Oct 18 - Fri, Nov 6

3:58 pm - 6:45 am

SEA

MEL

21h 47m

1 stop

9:45 am - 12:16 pm

MEL

SEA

20h 31m

1 stop

$1,058Qantas Airways

Fri, Sep 25 - Fri, Oct 23

2:40 pm - 6:45 am

SEA

MEL

23h 05m

1 stop

9:45 am - 1:57 pm

MEL

SEA

21h 12m

1 stop

$1,081American Airlines

Wed, Jun 3 - Wed, Jun 17

2:20 pm - 6:45 am

SEA

MEL

23h 25m

1 stop

9:45 am - 4:32 pm

MEL

SEA

23h 47m

1 stop

$1,082American Airlines

Sat, Aug 1 - Sat, Aug 15

1:16 pm - 9:15 am

SEA

MEL

25h 59m

1 stop

1:00 pm - 12:12 pm

MEL

SEA

18h 12m

1 stop

$1,092United Airlines

Sun, Oct 18 - Sat, Nov 7

5:06 pm - 10:05 am

SEA

ADL

24h 29m

2 stops

6:40 am - 6:47 pm

ADL

SEA

28h 37m

2 stops

$1,431United Airlines

Wed, Jun 24 - Mon, Jul 20

Air Canada flights from Seattle to Australia

Our best Air Canada deals on Seattle to Australia flight tickets

Air Canada

May 24

SEA2:55 pmSeattle/Tacoma Intl

23h 25m

1 stop

SYD7:20 amSydney Kingsford Smith

Jun 7

SYD9:20 amSydney Kingsford Smith

17h 45m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$986

Air Canada

May 24

SEA7:20 pmSeattle/Tacoma Intl

19h 00m

1 stop

SYD7:20 amSydney Kingsford Smith

Jun 7

SYD9:20 amSydney Kingsford Smith

30h 20m

1 stop

SEA10:40 pmSeattle/Tacoma Intl

$994

Air Canada

May 24

SEA7:20 pmSeattle/Tacoma Intl

19h 00m

1 stop

SYD7:20 amSydney Kingsford Smith

Jun 7

SYD7:00 amSydney Kingsford Smith

24h 20m

2 stops

SEA2:20 pmSeattle/Tacoma Intl

$1,000

Alaska Airlines flights from Seattle to Australia

Our best Alaska Airlines deals on Seattle to Australia flight tickets

Alaska Airlines

May 26

SEA8:50 pmSeattle/Tacoma Intl

29h 00m

1 stop

SYD6:50 pmSydney Kingsford Smith

Jun 13

SYD8:45 pmSydney Kingsford Smith

17h 49m

1 stop

SEA9:34 pmSeattle/Tacoma Intl

$1,176

Alaska Airlines

May 26

SEA8:50 pmSeattle/Tacoma Intl

29h 00m

1 stop

SYD6:50 pmSydney Kingsford Smith

Jan 8

SYD9:40 pmSydney Kingsford Smith

27h 20m

1 stop

SEA6:00 amSeattle/Tacoma Intl

$1,253

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 10/21

3:20 pm-6:45 am

1 stop21h 25m

Melbourne

Wed 10/28

11:15 pm-8:57 am

1 stop27h 42m

$996

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 10/21

3:20 pm-6:45 am

1 stop21h 25m

Melbourne

Wed 10/28

3:25 pm-9:25 pm

2 stops24h 00m

$1,036

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 6/7

7:20 pm-7:20 am

1 stop19h 00m

Sydney Kingsford Smith

Sun 6/14

9:20 am-10:40 pm

1 stop30h 20m

$1,036

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 11/11

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Mon 11/30

11:20 am-9:57 pm

1 stop29h 37m

$1,043

Quickest round-trip

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 10/18

3:20 pm-6:45 am

1 stop21h 25m

Melbourne

Fri 11/6

11:15 pm-12:04 am

1 stop19h 49m

$1,057

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Fri 9/25

3:58 pm-6:45 am

1 stop21h 47m

Melbourne

Fri 10/23

9:45 am-12:16 pm

1 stop20h 31m

$1,058

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 6/3

2:40 pm-6:45 am

1 stop23h 05m

Melbourne

Wed 6/17

9:45 am-1:57 pm

1 stop21h 12m

$1,081

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 8/1

2:20 pm-6:45 am

1 stop23h 25m

Melbourne

Sat 8/15

9:45 am-4:32 pm

1 stop23h 47m

$1,082

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sun 10/18

1:16 pm-9:15 am

1 stop25h 59m

Melbourne

Sat 11/7

1:00 pm-12:12 pm

1 stop18h 12m

$1,092

SeattleAdelaide

SEA - ADL

SEAADL

Seattle/Tacoma Intl

Wed 6/24

5:06 pm-10:05 am

2 stops24h 29m

Adelaide

Mon 7/20

6:40 am-6:47 pm

2 stops28h 37m

$1,431

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 $1,046 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 31% 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 May 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 12,390 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $385	Free Cancellation	Rating 7.1 11,066 reviews	Search Air Canada flights
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,211 reviews	Search ANA flights
Qantas Airways	PriceFrom $647	Free Cancellation	Rating 7.5 1,038 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,644 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,836 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $831	Free Cancellation	Rating 7.4 9,747 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,452 reviews	Search Delta flights
Air New Zealand	PriceFrom $1,116	Free Cancellation	Rating 8.0 647 reviews	Search Air New Zealand flights
Cathay Pacific	PriceFrom $1,153	Free Cancellation	Rating 7.6 1,340 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.