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Cheap flights from Seattle to Sydney from $554

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 Sydney departing on 11/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap return flights

Air Canada Logo
15:40 - 12:40SEA-SYD
27h 00m2 stops
Air Canada Logo
09:00 - 15:31SYD-SEA
24h 31m2 stops
$1,233Air Canada
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Sun, 26 Oct - Sun, 2 Nov
American Airlines Logo
15:23 - 07:30SEA-SYD
23h 07m1 stop
American Airlines Logo
18:45 - 21:58SYD-SEA
21h 13m1 stop
$1,234American Airlines
Find Deal
Sun, 21 Sep - Sun, 5 Oct
Hawaiian Airlines Logo
07:44 - 19:45SEA-SYD
18h 01m1 stop
Hawaiian Airlines Logo
21:40 - 23:32SYD-SEA
19h 52m1 stop
$1,239Hawaiian Airlines
Find Deal
Sat, 25 Oct - Tue, 28 Oct
Logo
10:05 - 09:35SEA-SYD
28h 30m1 stop
Logo
06:00 - 09:21SYD-SEA
20h 21m2 stops
$1,243
Find Deal
Mon, 23 Feb - Tue, 25 Aug
Air Canada Logo
05:50 - 18:05SEA-SYD
41h 15m2 stops
Air Canada Logo
11:20 - 09:31SYD-SEA
17h 11m1 stop
$1,248Air Canada
Find Deal
Sat, 13 Dec - Thu, 25 Dec
Alaska Airlines Logo
07:44 - 19:45SEA-SYD
18h 01m1 stop
Alaska Airlines Logo
21:40 - 23:36SYD-SEA
20h 56m2 stops
$1,251Alaska Airlines
Find Deal
Fri, 17 Oct - Tue, 4 Nov
Alaska Airlines Logo
18:59 - 19:45SEA-SYD
29h 46m2 stops
Alaska Airlines Logo
21:40 - 23:21SYD-SEA
20h 41m1 stop
$1,252Alaska Airlines
Find Deal
Wed, 5 Nov - Sat, 15 Nov
Air Canada Logo
05:50 - 06:55SEA-SYD
30h 05m1 stop
Air Canada Logo
11:20 - 14:31SYD-SEA
22h 11m1 stop
$1,254Air Canada
Find Deal
Sat, 13 Dec - Fri, 26 Dec
United Airlines Logo
17:05 - 09:05SEA-SYD
21h 00m1 stop
United Airlines Logo
11:20 - 16:09SYD-SEA
23h 49m1 stop
$1,275United Airlines
Find Deal
Tue, 2 Dec - Wed, 17 Dec
United Airlines Logo
15:19 - 06:55SEA-SYD
22h 36m1 stop
United Airlines Logo
10:20 - 16:24SYD-SEA
23h 04m1 stop
$1,277United Airlines
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Sun, 21 Sep - Sat, 4 Oct

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
26 Oct
SEA15:40Seattle/Tacoma Intl
27h 00m
2 stops
SYD12:40Sydney Kingsford Smith
2 Nov
SYD09:00Sydney Kingsford Smith
24h 31m
2 stops
SEA15:31Seattle/Tacoma Intl
$1,233
Find similar
Air Canada
13 Dec
SEA05:50Seattle/Tacoma Intl
41h 15m
2 stops
SYD18:05Sydney Kingsford Smith
25 Dec
SYD11:20Sydney Kingsford Smith
17h 11m
1 stop
SEA09:31Seattle/Tacoma Intl
$1,248
Find similar
Air Canada
13 Dec
SEA05:50Seattle/Tacoma Intl
30h 05m
1 stop
SYD06:55Sydney Kingsford Smith
26 Dec
SYD11:20Sydney Kingsford Smith
22h 11m
1 stop
SEA14:31Seattle/Tacoma Intl
$1,254
Find similar

United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets
United Airlines
15 Sept
SEA19:34Seattle/Tacoma Intl
18h 21m
1 stop
SYD06:55Sydney Kingsford Smith
1 Oct
SYD09:30Sydney Kingsford Smith
28h 45m
2 stops
SEA21:15Seattle/Tacoma Intl
$1,257
Find similar
United Airlines
2 Dec
SEA17:05Seattle/Tacoma Intl
21h 00m
1 stop
SYD09:05Sydney Kingsford Smith
17 Dec
SYD11:20Sydney Kingsford Smith
23h 49m
1 stop
SEA16:09Seattle/Tacoma Intl
$1,275
Find similar
United Airlines
21 Sept
SEA15:19Seattle/Tacoma Intl
22h 36m
1 stop
SYD06:55Sydney Kingsford Smith
4 Oct
SYD10:20Sydney Kingsford Smith
23h 04m
1 stop
SEA16:24Seattle/Tacoma Intl
$1,277
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Seattle to Sydney 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 11 September 2025.
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 26/10

15:40-12:40

2 stops27h 00m

Sydney Kingsford Smith

Sun 2/11

09:00-15:31

2 stops24h 31m

$1,233

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 21/9

15:23-07:30

1 stop23h 07m

Sydney Kingsford Smith

Sun 5/10

18:45-21:58

1 stop21h 13m

$1,234

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 25/10

07:44-19:45

1 stop18h 01m

Sydney Kingsford Smith

Tue 28/10

21:40-23:32

1 stop19h 52m

$1,239

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 23/2

10:05-09:35

1 stop28h 30m

Sydney Kingsford Smith

Tue 25/8

06:00-09:21

2 stops20h 21m

$1,243

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 13/12

05:50-18:05

2 stops41h 15m

Sydney Kingsford Smith

Thu 25/12

11:20-09:31

1 stop17h 11m

$1,248

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 17/10

07:44-19:45

1 stop18h 01m

Sydney Kingsford Smith

Tue 4/11

21:40-23:36

2 stops20h 56m

$1,251

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/11

18:59-19:45

2 stops29h 46m

Sydney Kingsford Smith

Sat 15/11

21:40-23:21

1 stop20h 41m

$1,252

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 13/12

05:50-06:55

1 stop30h 05m

Sydney Kingsford Smith

Fri 26/12

11:20-14:31

1 stop22h 11m

$1,254

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/12

17:05-09:05

1 stop21h 00m

Sydney Kingsford Smith

Wed 17/12

11:20-16:09

1 stop23h 49m

$1,275

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 21/9

15:19-06:55

1 stop22h 36m

Sydney Kingsford Smith

Sat 4/10

10:20-16:24

1 stop23h 04m

$1,277

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 Sydney

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 typical price of a round-trip flight between Seattle and Sydney?

What is the cheapest month to fly to Sydney?

The month of February is, on average, the cheapest month to fly to Sydney from Seattle, with most prices found around $1,478. If you aren’t able to travel to Sydney during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,558.

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

Our data shows that Monday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $1,463. The most expensive day to fly to Sydney is Saturday, with ticket prices averaging around $1,767.

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

According to our data, the cheapest time of day to fly to Sydney is in the afternoon. momondo users have found flights departing from Seattle to Sydney in the afternoon for as low as $1,396. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,714 on average. Flights to Sydney from Seattle in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,680 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Seattle for as low as $1,449 on momondo.

Can stopping save me money on Seattle to Sydney flights?

You could potentially save up to 9% on your flight if you consider stops on a Seattle to Sydney flight.

How have Seattle to Sydney flight prices changed over time?

As of September 2025, prices for Seattle to Sydney flights are approximately 41% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Sydney according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Seattle to Sydney (SEA to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Sydney

Direct flights

None
There are no direct flights from Seattle to Sydney. There are no popular flight routes from Seattle to Sydney.
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  • How far is Seattle/Tacoma Intl to Sydney Kingsford Smith by plane?

    Seattle/Tacoma Intl and Sydney Kingsford Smith are 12462.2 km apart from one another. In terms of flight time, this usually takes a little over 18h 01m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport refresh daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?

    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 stopovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport.

  • What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

    The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's licence and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Seattle to Sydney?

Best airlines flying from Seattle to Sydney

Compare and see reviews for airlines that fly from Seattle to Sydney with momondo
Airline
Rating
Free cancellation
Price
United AirlinesPriceFrom $1,208Free cancellationRating
7.4
8,937 reviews
Search United Airlines flights
Air CanadaPriceFrom $1,271Free cancellationRating
7.1
10,000 reviews
Search Air Canada flights

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Terrigal
Penrith
Katoomba
Lithgow
Leura
Manly
Bondi Beach
Coogee
Randwick
Cronulla
Charlestown
Newport
Swansea

Why use momondo?

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

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 Sydney for you.

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

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

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

Once you have performed a search for Seattle to Sydney flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Seattle to Sydney flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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