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Cheap flights from Seattle to Australia from $565

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 15/11. 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

Philippine Airlines Logo
23:35 - 09:00SEA-SYD
39h 25m1 stop
Philippine Airlines Logo
11:35 - 19:35SYD-SEA
26h 00m1 stop
$1,160Philippine Airlines
Find Deal
Sun, 19 Oct - Sun, 26 Oct
Philippine Airlines Logo
23:35 - 09:00SEA-SYD
39h 25m1 stop
Philippine Airlines Logo
11:35 - 19:35SYD-SEA
26h 00m1 stop
$1,161Philippine Airlines
Find Deal
Sun, 19 Oct - Sun, 26 Oct
Air Canada Logo
14:55 - 07:20SEA-SYD
23h 25m1 stop
Air Canada Logo
09:20 - 14:16SYD-SEA
21h 56m1 stop
$1,203Air Canada
Find Deal
Thu, 4 Sep - Wed, 17 Sep
Logo
15:23 - 07:05SEA-SYD
22h 42m1 stop
Logo
17:45 - 20:24SYD-SEA
19h 39m1 stop
$1,226
Find Deal
Thu, 4 Sep - Wed, 17 Sep
Air Canada Logo
14:55 - 11:40SEA-SYD
26h 45m2 stops
Air Canada Logo
10:20 - 09:31SYD-SEA
17h 11m1 stop
$1,232Air Canada
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Sun, 19 Oct - Sun, 26 Oct
Qantas Airways Logo
16:30 - 08:05SEA-SYD
21h 35m1 stop
Qantas Airways Logo
11:15 - 13:02SYD-SEA
20h 47m1 stop
$1,240Qantas Airways
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Mon, 20 Oct - Wed, 5 Nov
Qantas Airways Logo
17:59 - 07:05SEA-SYD
20h 06m1 stop
Qantas Airways Logo
18:45 - 20:07SYD-SEA
19h 22m1 stop
$1,241Qantas Airways
Find Deal
Tue, 30 Sep - Wed, 15 Oct
United Airlines Logo
15:25 - 06:20SEA-SYD
19h 55m1 stop
United Airlines Logo
12:10 - 11:10SYD-SEA
18h 00m1 stop
$1,289United Airlines
Find Deal
Tue, 20 Jan - Wed, 4 Feb
United Airlines Logo
18:13 - 09:15SEA-SYD
20h 02m1 stop
United Airlines Logo
14:00 - 15:35SYD-SEA
20h 35m1 stop
$1,300United Airlines
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Thu, 22 Jan - Mon, 2 Feb
Logo
19:15 - 12:35SEA-MEL
23h 20m2 stops
Logo
08:10 - 09:31MEL-SEA
20h 21m2 stops
$1,305
Find Deal
Sat, 18 Oct - Sun, 9 Nov

United Airlines flights from Seattle to Australia

Our best United Airlines deals on Seattle to Australia flight tickets
United Airlines
28 Aug
SEA12:43Seattle/Tacoma Intl
25h 17m
2 stops
SYD07:00Sydney Kingsford Smith
10 Sept
SYD09:30Sydney Kingsford Smith
25h 21m
2 stops
SEA17:51Seattle/Tacoma Intl
$1,286
Find similar
United Airlines
28 Aug
SEA11:11Seattle/Tacoma Intl
26h 49m
2 stops
SYD07:00Sydney Kingsford Smith
10 Sept
SYD09:30Sydney Kingsford Smith
23h 22m
2 stops
SEA15:52Seattle/Tacoma Intl
$1,288
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United Airlines
20 Jan
SEA15:25Seattle/Tacoma Intl
19h 55m
1 stop
SYD06:20Sydney Kingsford Smith
4 Feb
SYD12:10Sydney Kingsford Smith
18h 00m
1 stop
SEA11:10Seattle/Tacoma Intl
$1,289
Find similar

Delta flights from Seattle to Australia

Our best Delta deals on Seattle to Australia flight tickets
Delta
14 Dec
SEA11:25Seattle/Tacoma Intl
26h 05m
2 stops
SYD08:30Sydney Kingsford Smith
29 Dec
SYD10:40Sydney Kingsford Smith
20h 56m
2 stops
SEA12:36Seattle/Tacoma Intl
$1,286
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Delta
23 Jan
SEA20:15Seattle/Tacoma Intl
41h 15m
1 stop
SYD08:30Sydney Kingsford Smith
31 Jan
SYD14:15Sydney Kingsford Smith
19h 30m
1 stop
SEA14:45Seattle/Tacoma Intl
$1,291
Find similar
Delta
11 Sept
SEA10:15Seattle/Tacoma Intl
27h 20m
1 stop
SYD06:35Sydney Kingsford Smith
14 Oct
SYD10:25Sydney Kingsford Smith
22h 19m
1 stop
SEA14:44Seattle/Tacoma Intl
$1,302
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 20 August 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 19/10

23:35-09:00

1 stop39h 25m

Sydney Kingsford Smith

Sun 26/10

11:35-19:35

1 stop26h 00m

$1,160

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/10

23:35-09:00

1 stop39h 25m

Sydney Kingsford Smith

Sun 26/10

11:35-19:35

1 stop26h 00m

$1,161

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 4/9

14:55-07:20

1 stop23h 25m

Sydney Kingsford Smith

Wed 17/9

09:20-14:16

1 stop21h 56m

$1,203

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 4/9

15:23-07:05

1 stop22h 42m

Sydney Kingsford Smith

Wed 17/9

17:45-20:24

1 stop19h 39m

$1,226

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 19/10

14:55-11:40

2 stops26h 45m

Sydney Kingsford Smith

Sun 26/10

10:20-09:31

1 stop17h 11m

$1,232

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 20/10

16:30-08:05

1 stop21h 35m

Sydney Kingsford Smith

Wed 5/11

11:15-13:02

1 stop20h 47m

$1,240

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 30/9

17:59-07:05

1 stop20h 06m

Sydney Kingsford Smith

Wed 15/10

18:45-20:07

1 stop19h 22m

$1,241

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 20/1

15:25-06:20

1 stop19h 55m

Sydney Kingsford Smith

Wed 4/2

12:10-11:10

1 stop18h 00m

$1,289

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 22/1

18:13-09:15

1 stop20h 02m

Sydney Kingsford Smith

Mon 2/2

14:00-15:35

1 stop20h 35m

$1,300

SeattleMelbourne

SEA - MEL

SEAMEL

Seattle/Tacoma Intl

Sat 18/10

19:15-12:35

2 stops23h 20m

Melbourne

Sun 9/11

08:10-09:31

2 stops20h 21m

$1,305

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Australia from

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, February 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 $1,530. If you don’t want to visit Australia in February, then you should wait until March to fly from Seattle, when ticket prices are also cheap, with an average price of $1,598.

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 $1,493. 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 $1,804. 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 $1,426. 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 $1,750. 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 $1,728 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 $1,509 on momondo.

Can stopping save me money on Seattle to Australia flights?

You could potentially save up to 9% 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 $1,233Free cancellationRating
7.4
8,928 reviews
Search United Airlines flights
Air CanadaPriceFrom $1,298Free 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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