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

Alaska Airlines is the most popular carrier operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

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.

$696 Cheap Flights from Seattle to Sydney in 2026/27

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.

19:05 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 - 18:22SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$1,391Air Canada

Mon, 9 Nov - Mon, 23 Nov

15:15 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,392Air Canada

Mon, 1 Feb - Mon, 8 Feb

19:00 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

06:20 - 09:15SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 55m2 stops Brisbane Vancouver Intl

$1,405Multiple Airlines

Mon, 1 Mar - Wed, 17 Mar

19:00 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

06:00 - 09:18SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 18m2 stops Brisbane Vancouver Intl

$1,406Multiple Airlines

Wed, 24 Mar - Wed, 21 Apr

19:05 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

08:30 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 02m2 stops Brisbane Vancouver Intl

$1,412Air Canada

Mon, 9 Nov - Tue, 17 Nov

15:15 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

09:00 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 32m2 stops Brisbane Vancouver Intl

$1,414Air Canada

Mon, 1 Feb - Mon, 8 Feb

19:05 - 14:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 35m2 stops Vancouver Intl Brisbane

11:20 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$1,421Air Canada

Mon, 9 Nov - Mon, 23 Nov

19:05 - 14:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 35m2 stops Vancouver Intl Brisbane

11:20 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$1,422Air Canada

Tue, 9 Feb - Sun, 28 Feb

21:30 - 09:50SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 - 19:45SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$1,425Philippine Airlines

Mon, 1 Mar - Wed, 17 Mar

08:40 - 09:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 55m1 stop Vancouver Intl

11:20 - 18:22SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$1,426Air Canada

Sun, 15 Nov - Sun, 22 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

08:40 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 55m1 stop Vancouver Intl

11:20 - 18:22SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$1,391Air Canada

Tue, 27 Oct - Tue, 3 Nov

15:15 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

06:20 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 12m2 stops Brisbane Vancouver Intl

$1,406Multiple Airlines

Sun, 25 Oct - Sun, 8 Nov

22:30 - 09:50SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 - 19:45SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$1,412Philippine Airlines

Sun, 25 Oct - Sun, 1 Nov

15:15 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

08:30 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 02m2 stops Brisbane Vancouver Intl

$1,414Air Canada

Tue, 27 Oct - Tue, 3 Nov

19:05 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 - 14:37SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,431Air Canada

Sun, 25 Oct - Sun, 8 Nov

15:15 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

06:20 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 12m2 stops Brisbane Vancouver Intl

$1,445Multiple Airlines

Sun, 25 Oct - Sun, 8 Nov

19:05 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

07:30 - 09:27SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 57m2 stops Brisbane Vancouver Intl

$1,468Air Canada

Mon, 26 Oct - Fri, 30 Oct

19:05 - 07:40SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

42h 35m2 stops Vancouver Intl Brisbane

08:30 - 09:32SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 02m2 stops Brisbane Vancouver Intl

$1,482Air Canada

Tue, 27 Oct - Wed, 4 Nov

19:05 - 13:15SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 10m2 stops Vancouver Intl Brisbane

07:30 - 09:27SYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 57m2 stops Brisbane Vancouver Intl

$1,510Multiple Airlines

Mon, 26 Oct - Fri, 30 Oct

19:15 - 08:35SEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 20m1 stop Vancouver Intl

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

22h 17m1 stop Vancouver Intl

$1,533Air Canada

Sat, 24 Oct - Sat, 31 Oct

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Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

9 Nov

SEA19:05Seattle/Tacoma Intl

19h 30m

1 stop

SYD09:35Sydney Kingsford Smith

23 Nov

SYD11:20Sydney Kingsford Smith

26h 02m

1 stop

SEA18:22Seattle/Tacoma Intl

$1,391

Air Canada

1 Feb

SEA15:15Seattle/Tacoma Intl

23h 20m

1 stop

SYD09:35Sydney Kingsford Smith

8 Feb

SYD11:20Sydney Kingsford Smith

22h 17m

1 stop

SEA14:37Seattle/Tacoma Intl

$1,392

Air Canada

9 Nov

SEA19:05Seattle/Tacoma Intl

19h 30m

1 stop

SYD09:35Sydney Kingsford Smith

17 Nov

SYD08:30Sydney Kingsford Smith

20h 02m

2 stops

SEA09:32Seattle/Tacoma Intl

$1,412

Qantas Airways flights from Seattle to Sydney

Our best Qantas Airways deals on Seattle to Sydney flight tickets

Qantas Airways

1 Nov

SEA13:50Seattle/Tacoma Intl

21h 35m

1 stop

SYD06:25Sydney Kingsford Smith

4 Nov

SYD14:45Sydney Kingsford Smith

27h 57m

2 stops

SEA23:42Seattle/Tacoma Intl

$2,436

Qantas Airways

1 Nov

SEA17:59Seattle/Tacoma Intl

20h 01m

1 stop

SYD09:00Sydney Kingsford Smith

4 Nov

SYD18:45Sydney Kingsford Smith

23h 57m

2 stops

SEA23:42Seattle/Tacoma Intl

$2,905

Qantas Airways

4 Nov

SEA15:48Seattle/Tacoma Intl

19h 37m

1 stop

SYD06:25Sydney Kingsford Smith

25 Nov

SYD14:45Sydney Kingsford Smith

28h 35m

2 stops

SEA00:20Seattle/Tacoma Intl

$3,825

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/11

19:05-09:35

1 stop19h 30m

Sydney Kingsford Smith

Mon 23/11

11:20-18:22

1 stop26h 02m

$1,391

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 1/2

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Mon 8/2

11:20-14:37

1 stop22h 17m

$1,392

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 1/3

19:00-09:35

1 stop19h 35m

Sydney Kingsford Smith

Wed 17/3

06:20-09:15

2 stops20h 55m

$1,405

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 24/3

19:00-08:35

1 stop19h 35m

Sydney Kingsford Smith

Wed 21/4

06:00-09:18

2 stops20h 18m

$1,406

Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/11

19:05-09:35

1 stop19h 30m

Sydney Kingsford Smith

Tue 17/11

08:30-09:32

2 stops20h 02m

$1,412

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 1/2

15:15-09:35

1 stop23h 20m

Sydney Kingsford Smith

Mon 8/2

09:00-09:32

2 stops19h 32m

$1,414

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/11

19:05-14:40

2 stops24h 35m

Sydney Kingsford Smith

Mon 23/11

11:20-09:32

1 stop17h 12m

$1,421

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 9/2

19:05-14:40

2 stops24h 35m

Sydney Kingsford Smith

Sun 28/2

11:20-09:32

1 stop17h 12m

$1,422

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 1/3

21:30-09:50

1 stop41h 20m

Sydney Kingsford Smith

Wed 17/3

11:30-19:45

1 stop26h 15m

$1,425

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 15/11

08:40-09:35

1 stop29h 55m

Sydney Kingsford Smith

Sun 22/11

11:20-18:22

1 stop26h 02m

$1,426

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

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 $1,418 to $1,811.
The lowest price recently found on this route was $1,391.

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 $1,145. If you aren’t able to travel to Sydney during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $1,486.

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 $1,668 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 $1,399 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of October 2026, prices for Seattle to Sydney flights are approximately 51% 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	$696
Fastest flight time	19h 30m
Direct flights	None

The best one-way flight to Sydney from Seattle in the past 72 hours is $696. The best return flight deal from Seattle to Sydney found on momondo in the last 72 hours is $1,391.

The fastest flight from Seattle to Sydney takes 19h 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 19h 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.