Which stopover airport offers the lowest fares from Seattle to Sydney?

Flights via Honolulu (HNL) offer the lowest average return price of $1,181.

Which stopover airport has the shortest travel time from Seattle to Sydney?

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 19h 00m.

Which stopover airport has the shortest connection time from Seattle to Sydney?

Vancouver (YVR) has the shortest average stopover time for this route: 2h 08m.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Sydney Kingsford Smith?

Qantas Airways, American Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

Which airport is the most popular for stopovers for flights between Seattle and Sydney?

Vancouver (YVR) was the most common stop: 50% of momondo users choosing one-stop flights on this route connected there.

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 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.

$675 Cheap Flights from Seattle to Sydney in 2026

Find the cheapest flights from Seattle to Sydney

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

15:00 - 08:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,177Air Canada

Tue, 20 Oct - Tue, 27 Oct

15:00 - 08:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,179Air Canada

Tue, 20 Oct - Tue, 27 Oct

10:50 - 08:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

08:00 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 37m2 stops Brisbane Vancouver Intl

$1,195Air Canada

Tue, 20 Oct - Tue, 27 Oct

10:50 - 08:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

08:00 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 37m2 stops Brisbane Vancouver Intl

$1,197Air Canada

Tue, 20 Oct - Tue, 27 Oct

20:00 - 06:25SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 25m1 stop Los Angeles Los Angeles

14:00 - 18:54SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 54m2 stops Nadi Los Angeles Los Angeles

$1,214Multiple Airlines

Sat, 24 Oct - Wed, 11 Nov

20:00 - 06:25SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 25m1 stop Los Angeles Los Angeles

14:55 - 18:54SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 59m2 stops Nadi Los Angeles Los Angeles

$1,215Multiple Airlines

Sat, 24 Oct - Fri, 13 Nov

20:00 - 06:25SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 25m1 stop Los Angeles Los Angeles

14:00 - 18:54SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 54m2 stops Nadi Los Angeles Los Angeles

$1,217Multiple Airlines

Sat, 24 Oct - Mon, 9 Nov

20:09 - 06:25SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 16m1 stop Los Angeles Los Angeles

14:55 - 18:54SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 59m2 stops Nadi Los Angeles Los Angeles

$1,218Multiple Airlines

Wed, 28 Oct - Fri, 13 Nov

20:09 - 06:25SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

40h 16m1 stop Los Angeles Los Angeles

14:00 - 18:54SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 54m2 stops Nadi Los Angeles Los Angeles

$1,220Multiple Airlines

Thu, 29 Oct - Mon, 9 Nov

20:00 - 07:30SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 30m1 stop Los Angeles Los Angeles

14:00 - 18:54SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 54m2 stops Nadi Los Angeles Los Angeles

$1,246Multiple Airlines

Tue, 20 Oct - Tue, 27 Oct

Cheap last-minute flights

Enter your travel dates to find the best prices.

10:50 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

09:20 - 18:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,249Air Canada

Tue, 8 Sep - Wed, 30 Sep

15:00 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

09:20 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$1,254Air Canada

Tue, 8 Sep - Tue, 22 Sep

10:50 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

06:00 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 05m2 stops Brisbane Vancouver Intl

$1,270Multiple Airlines

Tue, 8 Sep - Tue, 22 Sep

19:15 - 11:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 25m2 stops Vancouver Intl Brisbane

09:20 - 18:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,279Air Canada

Sun, 13 Sep - Sun, 20 Sep

10:50 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

06:30 - 18:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

29h 02m2 stops Brisbane Vancouver Intl

$1,340Air Canada

Tue, 8 Sep - Wed, 30 Sep

10:50 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 30m1 stop Vancouver Intl

09:20 - 18:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,358Air Canada

Sun, 13 Sep - Sun, 20 Sep

05:50 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

32h 30m1 stop Vancouver Intl

09:20 - 22:47SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

30h 27m1 stop Vancouver Intl

$1,386Air New Zealand

Tue, 8 Sep - Wed, 30 Sep

05:50 - 20:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

45h 50m2 stops Vancouver Intl Brisbane

09:20 - 18:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,400Air Canada

Sat, 12 Sep - Sun, 27 Sep

19:15 - 20:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

32h 25m2 stops Vancouver Intl Brisbane

09:20 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$1,401Air Canada

Sat, 12 Sep - Sun, 27 Sep

19:15 - 07:20SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 05m1 stop Vancouver Intl

09:20 - 10:05SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$1,408Air Canada

Sat, 12 Sep - Sun, 27 Sep

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Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

20 Oct

SEA15:00Seattle/Tacoma Intl

23h 20m

1 stop

SYD08:20Sydney Kingsford Smith

27 Oct

SYD10:20Sydney Kingsford Smith

22h 17m

1 stop

SEA14:37Seattle/Tacoma Intl

$1,177

Air Canada

20 Oct

SEA15:00Seattle/Tacoma Intl

23h 20m

1 stop

SYD08:20Sydney Kingsford Smith

27 Oct

SYD10:20Sydney Kingsford Smith

22h 17m

1 stop

SEA14:37Seattle/Tacoma Intl

$1,179

Air Canada

20 Oct

SEA10:50Seattle/Tacoma Intl

27h 30m

1 stop

SYD08:20Sydney Kingsford Smith

27 Oct

SYD08:00Sydney Kingsford Smith

24h 37m

2 stops

SEA14:37Seattle/Tacoma Intl

$1,195

Air New Zealand flights from Seattle to Sydney

Our best Air New Zealand deals on Seattle to Sydney flight tickets

Air New Zealand

8 Sept

SEA05:50Seattle/Tacoma Intl

32h 30m

1 stop

SYD07:20Sydney Kingsford Smith

30 Sept

SYD09:20Sydney Kingsford Smith

30h 27m

1 stop

SEA22:47Seattle/Tacoma Intl

$1,386

Air New Zealand

8 Sept

SEA15:00Seattle/Tacoma Intl

23h 20m

1 stop

SYD07:20Sydney Kingsford Smith

20 Sept

SYD09:20Sydney Kingsford Smith

26h 12m

1 stop

SEA18:32Seattle/Tacoma Intl

$1,451

Air New Zealand

8 Sept

SEA15:00Seattle/Tacoma Intl

23h 20m

1 stop

SYD07:20Sydney Kingsford Smith

24 Sept

SYD09:20Sydney Kingsford Smith

26h 12m

1 stop

SEA18:32Seattle/Tacoma Intl

$1,507

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 20/10

15:00-08:20

1 stop23h 20m

Sydney Kingsford Smith

Tue 27/10

10:20-14:37

1 stop22h 17m

$1,177

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 20/10

15:00-08:20

1 stop23h 20m

Sydney Kingsford Smith

Tue 27/10

10:20-14:37

1 stop22h 17m

$1,179

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 20/10

10:50-08:20

1 stop27h 30m

Sydney Kingsford Smith

Tue 27/10

08:00-14:37

2 stops24h 37m

$1,195

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 20/10

10:50-08:20

1 stop27h 30m

Sydney Kingsford Smith

Tue 27/10

08:00-14:37

2 stops24h 37m

$1,197

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 24/10

20:00-06:25

1 stop40h 25m

Sydney Kingsford Smith

Wed 11/11

14:00-18:54

2 stops23h 54m

$1,214

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 24/10

20:00-06:25

1 stop40h 25m

Sydney Kingsford Smith

Fri 13/11

14:55-18:54

2 stops22h 59m

$1,215

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 24/10

20:00-06:25

1 stop40h 25m

Sydney Kingsford Smith

Mon 9/11

14:00-18:54

2 stops23h 54m

$1,217

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 28/10

20:09-06:25

1 stop40h 16m

Sydney Kingsford Smith

Fri 13/11

14:55-18:54

2 stops22h 59m

$1,218

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 29/10

20:09-06:25

1 stop40h 16m

Sydney Kingsford Smith

Mon 9/11

14:00-18:54

2 stops23h 54m

$1,220

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 20/10

20:00-07:30

1 stop41h 30m

Sydney Kingsford Smith

Tue 27/10

14:00-18:54

2 stops22h 54m

$1,246

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Stopovers

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

Prices are currently low for flights on this route.

Typical prices usually range from $1,372 to $1,501.
The lowest price recently found on this route was $1,177.

What is the cheapest month to fly to Sydney?

The month of August is, on average, the cheapest month to fly to Sydney from Seattle, with most prices found around $1,114. If you aren’t able to travel to Sydney during the month of August, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $1,300.

How far in advance should I book a flight from Seattle 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 $1,580 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 $1,324 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of September 2026, prices for Seattle to Sydney flights are approximately 18% 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	$675
Fastest flight time	18h 30m
Direct flights	None

The best one-way flight to Sydney from Seattle in the past 72 hours is $675. The best return flight deal from Seattle to Sydney found on momondo in the last 72 hours is $1,177.

The fastest flight from Seattle to Sydney takes 18h 30m

There are no direct flights from Seattle to Sydney. There are no popular flight routes from Seattle to Sydney.

Search flight deals

Frequently asked questions about flying from Seattle to Sydney

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 30m.
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 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.

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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.