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Cheap flights from Seattle to Sydney from $562

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 11/8. 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

Air Canada Logo
14:55 - 07:20SEA-SYD
23h 25m1 stop
Air Canada Logo
09:20 - 18:36SYD-SEA
26h 16m1 stop
$1,092Air Canada
Find Deal
Wed, 13 Aug - Sun, 17 Aug
Air Canada Logo
19:15 - 07:20SEA-SYD
19h 05m1 stop
Air Canada Logo
09:20 - 09:22SYD-SEA
17h 02m1 stop
$1,093Air Canada
Find Deal
Wed, 27 Aug - Tue, 16 Sep
Air Canada Logo
15:40 - 08:35SEA-SYD
22h 55m1 stop
Air Canada Logo
11:20 - 14:26SYD-SEA
22h 06m1 stop
$1,107Air Canada
Find Deal
Mon, 27 Oct - Sun, 9 Nov
Air Canada Logo
19:15 - 07:20SEA-SYD
19h 05m1 stop
Air Canada Logo
07:30 - 09:22SYD-SEA
18h 52m2 stops
$1,116Air Canada
Find Deal
Wed, 27 Aug - Tue, 16 Sep
Air Canada Logo
10:00 - 21:40SEA-SYD
42h 40m2 stops
Air Canada Logo
09:20 - 14:16SYD-SEA
21h 56m1 stop
$1,121Air Canada
Find Deal
Wed, 13 Aug - Sun, 17 Aug
Logo
20:00 - 14:25SEA-SYD
23h 25m2 stops
Logo
11:20 - 19:16SYD-SEA
26h 56m1 stop
$1,148
Find Deal
Mon, 3 Nov - Sun, 16 Nov
Logo
20:00 - 13:55SEA-SYD
22h 55m2 stops
Logo
11:20 - 19:16SYD-SEA
26h 56m1 stop
$1,150
Find Deal
Sun, 2 Nov - Sun, 16 Nov
Qantas Airways Logo
16:59 - 07:05SEA-SYD
21h 06m1 stop
Qantas Airways Logo
09:10 - 21:36SYD-SEA
29h 26m1 stop
$1,181Qantas Airways
Find Deal
Wed, 10 Sep - Wed, 17 Sep
Qantas Airways Logo
15:23 - 07:05SEA-SYD
22h 42m1 stop
Qantas Airways Logo
10:10 - 10:59SYD-SEA
18h 49m1 stop
$1,244Qantas Airways
Find Deal
Sat, 27 Sep - Thu, 9 Oct
American Airlines Logo
13:35 - 06:55SEA-SYD
23h 20m1 stop
American Airlines Logo
10:10 - 16:53SYD-SEA
24h 43m2 stops
$1,256American Airlines
Find Deal
Mon, 6 Oct - Mon, 20 Oct

American Airlines flights from Seattle to Sydney

Our best American Airlines deals on Seattle to Sydney flight tickets
American Airlines
6 Oct
SEA13:35Seattle/Tacoma Intl
23h 20m
1 stop
SYD06:55Sydney Kingsford Smith
20 Oct
SYD10:10Sydney Kingsford Smith
24h 43m
2 stops
SEA16:53Seattle/Tacoma Intl
$1,256
Find similar
American Airlines
2 Aug
SEA14:30Seattle/Tacoma Intl
24h 00m
1 stop
SYD07:30Sydney Kingsford Smith
24 Aug
SYD12:10Sydney Kingsford Smith
24h 06m
1 stop
SEA19:16Seattle/Tacoma Intl
$1,273
Find similar
American Airlines
4 Aug
SEA14:30Seattle/Tacoma Intl
26h 10m
2 stops
SYD09:40Sydney Kingsford Smith
17 Aug
SYD06:00Sydney Kingsford Smith
25h 01m
2 stops
SEA14:01Seattle/Tacoma Intl
$1,300
Find similar

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets
Air Canada
13 Aug
SEA14:55Seattle/Tacoma Intl
23h 25m
1 stop
SYD07:20Sydney Kingsford Smith
17 Aug
SYD09:20Sydney Kingsford Smith
26h 16m
1 stop
SEA18:36Seattle/Tacoma Intl
$1,092
Find similar
Air Canada
27 Aug
SEA19:15Seattle/Tacoma Intl
19h 05m
1 stop
SYD07:20Sydney Kingsford Smith
16 Sept
SYD09:20Sydney Kingsford Smith
17h 02m
1 stop
SEA09:22Seattle/Tacoma Intl
$1,093
Find similar
Air Canada
27 Oct
SEA15:40Seattle/Tacoma Intl
22h 55m
1 stop
SYD08:35Sydney Kingsford Smith
9 Nov
SYD11:20Sydney Kingsford Smith
22h 06m
1 stop
SEA14:26Seattle/Tacoma Intl
$1,107
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 30 July 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

Wed 13/8

14:55-07:20

1 stop23h 25m

Sydney Kingsford Smith

Sun 17/8

09:20-18:36

1 stop26h 16m

$1,092

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 27/8

19:15-07:20

1 stop19h 05m

Sydney Kingsford Smith

Tue 16/9

09:20-09:22

1 stop17h 02m

$1,093

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 27/10

15:40-08:35

1 stop22h 55m

Sydney Kingsford Smith

Sun 9/11

11:20-14:26

1 stop22h 06m

$1,107

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 27/8

19:15-07:20

1 stop19h 05m

Sydney Kingsford Smith

Tue 16/9

07:30-09:22

2 stops18h 52m

$1,116

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 13/8

10:00-21:40

2 stops42h 40m

Sydney Kingsford Smith

Sun 17/8

09:20-14:16

1 stop21h 56m

$1,121

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/11

20:00-14:25

2 stops23h 25m

Sydney Kingsford Smith

Sun 16/11

11:20-19:16

1 stop26h 56m

$1,148

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/11

20:00-13:55

2 stops22h 55m

Sydney Kingsford Smith

Sun 16/11

11:20-19:16

1 stop26h 56m

$1,150

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 10/9

16:59-07:05

1 stop21h 06m

Sydney Kingsford Smith

Wed 17/9

09:10-21:36

1 stop29h 26m

$1,181

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 27/9

15:23-07:05

1 stop22h 42m

Sydney Kingsford Smith

Thu 9/10

10:10-10:59

1 stop18h 49m

$1,244

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/10

13:35-06:55

1 stop23h 20m

Sydney Kingsford Smith

Mon 20/10

10:10-16:53

2 stops24h 43m

$1,256

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 Sydney from

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 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 $1,534. 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 $1,581.

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 $1,484. The most expensive day to fly to Sydney is Saturday, with ticket prices averaging around $1,793.

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 $1,417. 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 $1,740 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 $1,725 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 $1,541 on momondo.

Can stopping save me money on Seattle to Sydney flights?

You could potentially save up to 10% 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 July 2025, prices for Seattle to Sydney flights are approximately 55% 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

Best price found

$562

Fastest flight time

18h 35m

Direct flights

None

Airports in Sydney

1 airport
The best one-way flight to Sydney from Seattle in the past 72 hours is $562. The best return flight deal from Seattle to Sydney found on momondo in the last 72 hours is $1,092.
The fastest flight from Seattle to Sydney takes 18h 35m
There are no direct flights from Seattle to Sydney. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Sydney Kingsford Smith Airport.
There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)
Search flight deals

  • 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 35m.

  • 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 $1,226Free cancellationRating
7.4
8,896 reviews
Search United Airlines flights
Air CanadaPriceFrom $1,290Free cancellationRating
7.1
9,826 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
Katoomba
Lithgow
Penrith
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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