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Cheap flights from Seattle to Australia from $577

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Australia departing on 12/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Cheap return flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
13:40 - 19:45SEA-SYD
36h 05m1 stop
Alaska Airlines Logo
21:40 - 05:35SYD-SEA
26h 55m1 stop
$1,283Alaska Airlines
Find Deal
Sun, 26 Oct - Sun, 9 Nov
Philippine Airlines Logo
23:35 - 09:50SEA-SYD
40h 15m1 stop
Philippine Airlines Logo
11:35 - 18:40SYD-SEA
26h 05m1 stop
$1,286Philippine Airlines
Find Deal
Fri, 24 Oct - Wed, 12 Nov
Hawaiian Airlines Logo
07:20 - 19:45SEA-SYD
17h 25m1 stop
Hawaiian Airlines Logo
21:40 - 06:25SYD-SEA
26h 45m1 stop
$1,354Hawaiian Airlines
Find Deal
Fri, 27 Feb - Sun, 22 Mar
Hawaiian Airlines Logo
07:44 - 19:45SEA-SYD
18h 01m1 stop
Hawaiian Airlines Logo
21:40 - 23:21SYD-SEA
20h 41m1 stop
$1,358Hawaiian Airlines
Find Deal
Mon, 20 Oct - Sun, 2 Nov
Multiple Airlines Logo
21:30 - 04:15SEA-PER
38h 45m2 stops
Multiple Airlines Logo
05:35 - 18:40PER-SEA
29h 05m2 stops
$1,381Multiple Airlines
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Sun, 9 Nov - Wed, 19 Nov
Multiple Airlines Logo
20:00 - 13:15SEA-MEL
23h 15m2 stops
Multiple Airlines Logo
06:05 - 09:31MEL-SEA
21h 26m2 stops
$1,442Multiple Airlines
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Tue, 10 Mar - Tue, 24 Mar
United Airlines Logo
09:20 - 10:00SEA-MEL
29h 40m1 stop
United Airlines Logo
13:00 - 12:51MEL-SEA
18h 51m1 stop
$1,537United Airlines
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Sat, 21 Feb - Sat, 7 Mar
United Airlines Logo
17:11 - 10:00SEA-MEL
21h 49m1 stop
United Airlines Logo
13:00 - 16:52MEL-SEA
22h 52m1 stop
$1,539United Airlines
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Wed, 3 Dec - Mon, 22 Dec
Air Canada Logo
20:00 - 15:35SEA-MEL
24h 35m2 stops
Air Canada Logo
07:10 - 09:31MEL-SEA
21h 21m2 stops
$1,566Air Canada
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Wed, 11 Feb - Sun, 22 Feb
Air Canada Logo
20:00 - 15:35SEA-MEL
24h 35m2 stops
Air Canada Logo
07:10 - 09:31MEL-SEA
21h 21m2 stops
$1,567Air Canada
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Wed, 11 Feb - Sun, 22 Feb

Alaska Airlines flights from Seattle to Australia

Our best Alaska Airlines deals on Seattle to Australia flight tickets
Alaska Airlines
26 Oct
SEA13:40Seattle/Tacoma Intl
36h 05m
1 stop
SYD19:45Sydney Kingsford Smith
9 Nov
SYD21:40Sydney Kingsford Smith
26h 55m
1 stop
SEA05:35Seattle/Tacoma Intl
$1,283
Find similar
Alaska Airlines
27 Oct
SEA07:00Seattle/Tacoma Intl
18h 45m
1 stop
SYD19:45Sydney Kingsford Smith
9 Nov
SYD21:40Sydney Kingsford Smith
20h 41m
1 stop
SEA23:21Seattle/Tacoma Intl
$1,330
Find similar
Alaska Airlines
6 Nov
SEA07:00Seattle/Tacoma Intl
17h 45m
1 stop
SYD19:45Sydney Kingsford Smith
9 Dec
SYD21:40Sydney Kingsford Smith
18h 07m
1 stop
SEA20:47Seattle/Tacoma Intl
$1,337
Find similar

Philippine Airlines flights from Seattle to Australia

Our best Philippine Airlines deals on Seattle to Australia flight tickets
Philippine Airlines
24 Oct
SEA23:35Seattle/Tacoma Intl
40h 15m
1 stop
SYD09:50Sydney Kingsford Smith
12 Nov
SYD11:35Sydney Kingsford Smith
26h 05m
1 stop
SEA18:40Seattle/Tacoma Intl
$1,286
Find similar
Philippine Airlines
26 Oct
SEA22:30Seattle/Tacoma Intl
40h 05m
1 stop
MEL08:35Melbourne
9 Nov
MEL10:20Melbourne
27h 20m
1 stop
SEA18:40Seattle/Tacoma Intl
$1,343
Find similar
Philippine Airlines
4 Mar
SEA21:30Seattle/Tacoma Intl
42h 35m
1 stop
BNE10:05Brisbane
18 Mar
BNE11:05Brisbane
25h 35m
1 stop
SEA19:40Seattle/Tacoma Intl
$1,387
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Seattle to Australia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 78,305 searches. Data last updated 4 October 2025.
Use the filters below to find and compare flights from Seattle to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 26/10

13:40-19:45

1 stop36h 05m

Sydney Kingsford Smith

Sun 9/11

21:40-05:35

1 stop26h 55m

$1,283

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 24/10

23:35-09:50

1 stop40h 15m

Sydney Kingsford Smith

Wed 12/11

11:35-18:40

1 stop26h 05m

$1,286

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 27/2

07:20-19:45

1 stop17h 25m

Sydney Kingsford Smith

Sun 22/3

21:40-06:25

1 stop26h 45m

$1,354

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 20/10

07:44-19:45

1 stop18h 01m

Sydney Kingsford Smith

Sun 2/11

21:40-23:21

1 stop20h 41m

$1,358

SeattlePerth

SEA - PER

SEAPER

Seattle/Tacoma Intl

Sun 9/11

21:30-04:15

2 stops38h 45m

Perth

Wed 19/11

05:35-18:40

2 stops29h 05m

$1,381

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Tue 10/3

20:00-13:15

2 stops23h 15m

Melbourne

Tue 24/3

06:05-09:31

2 stops21h 26m

$1,442

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 21/2

09:20-10:00

1 stop29h 40m

Melbourne

Sat 7/3

13:00-12:51

1 stop18h 51m

$1,537

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 3/12

17:11-10:00

1 stop21h 49m

Melbourne

Mon 22/12

13:00-16:52

1 stop22h 52m

$1,539

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 11/2

20:00-15:35

2 stops24h 35m

Melbourne

Sun 22/2

07:10-09:31

2 stops21h 21m

$1,566

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Wed 11/2

20:00-15:35

2 stops24h 35m

Melbourne

Sun 22/2

07:10-09:31

2 stops21h 21m

$1,567

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

What is the cheapest month to fly to Australia?

In general, September is the cheapest month to fly from Seattle to Australia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,386. If you don’t want to visit Australia in September, then you should wait until February to fly from Seattle, when ticket prices are also cheap, with an average price of $1,458.

What is the cheapest day to depart on your flight to Australia?

On average, the least expensive day to fly to Australia from Seattle is on a Monday. momondo users have found tickets for Monday departures for as low as $1,464. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from Seattle to Australia on a Saturday will generally be more expensive and average around $1,769. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Australia?

According to our data, the cheapest time of day to fly to Australia is in the afternoon. momondo users have found flights departing from Seattle to Australia in the afternoon for as low as $1,398. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Australia are more costly in the morning, with an average ticket price of $1,716. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,649 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from Seattle for as low as $1,377 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 2% 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

Direct flights

None
There are no direct flights from Seattle to Australia. There are no popular flight routes from Seattle to Australia.
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  • 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 were last updated today.

  • How many operators does momondo search 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?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. 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 necessary travel and health documents for your Australia trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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
United AirlinesPriceFrom $1,210Free cancellationRating
7.4
8,940 reviews
Search United Airlines flights
Air CanadaPriceFrom $1,273Free cancellationRating
7.1
10,000 reviews
Search Air Canada flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Australia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Australia for you.

Can I find flights from Seattle to Australia with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Seattle to Australia flights to just show those with flexible booking policies.

How can momondo help me find flights from Seattle to Australia?

Once all potential Seattle to Australia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Seattle to Australia right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Seattle to Australia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Australia and let you know when they change.

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