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.

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

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

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.

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.

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

Flights via Honolulu (HNL) offer the lowest average return price of $1,220.

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?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport is 1 as of July 2026.

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.

$710 Cheap Flights from Seattle to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

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.

11:06 - 07:30

SEA

SYD

26h 24m

1 stop

14:00 - 18:26

SYD

SEA

22h 26m

2 stops

$1,340Multiple Airlines

Tue, 20 Oct - Tue, 27 Oct

11:06 - 07:30

SEA

SYD

26h 24m

1 stop

14:00 - 18:26

SYD

SEA

22h 26m

2 stops

$1,375Multiple Airlines

Mon, 12 Oct - Wed, 28 Oct

10:40 - 09:25

SEA

SYD

29h 45m

2 stops

12:45 - 18:32

SYD

SEA

23h 47m

2 stops

$1,383ANA

Sun, 23 Aug - Mon, 19 Oct

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

14:15 - 18:26

SYD

SEA

22h 11m

2 stops

$1,386Multiple Airlines

Sun, 23 Aug - Wed, 21 Oct

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

12:45 - 18:32

SYD

SEA

23h 47m

2 stops

$1,393ANA

Sun, 16 Aug - Wed, 14 Oct

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

20:55 - 14:25

SYD

SEA

34h 30m

1 stop

$1,395ANA

Mon, 3 Aug - Tue, 18 Aug

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

14:15 - 18:26

SYD

SEA

22h 11m

2 stops

$1,398Multiple Airlines

Tue, 18 Aug - Tue, 13 Oct

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

14:15 - 18:26

SYD

SEA

22h 11m

2 stops

$1,399Multiple Airlines

Mon, 17 Aug - Wed, 14 Oct

16:30 - 09:25

SEA

SYD

23h 55m

1 stop

20:55 - 18:32

SYD

SEA

38h 37m

2 stops

$1,400ANA

Mon, 3 Aug - Tue, 18 Aug

16:30 - 19:10

SEA

SYD

33h 40m

1 stop

14:15 - 18:26

SYD

SEA

22h 11m

2 stops

$1,403Multiple Airlines

Sun, 16 Aug - Thu, 15 Oct

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ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets

ANA

26 July

SEA16:30Seattle/Tacoma Intl

33h 40m

1 stop

SYD19:10Sydney Kingsford Smith

11 Aug

SYD11:45Sydney Kingsford Smith

23h 47m

2 stops

SEA18:32Seattle/Tacoma Intl

$1,327

ANA

23 Aug

SEA10:40Seattle/Tacoma Intl

29h 45m

2 stops

SYD09:25Sydney Kingsford Smith

19 Oct

SYD12:45Sydney Kingsford Smith

23h 47m

2 stops

SEA18:32Seattle/Tacoma Intl

$1,383

ANA

2 Aug

SEA10:40Seattle/Tacoma Intl

29h 45m

2 stops

SYD09:25Sydney Kingsford Smith

18 Aug

SYD11:45Sydney Kingsford Smith

23h 47m

2 stops

SEA18:32Seattle/Tacoma Intl

$1,385

United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

United Airlines

9 Aug

SEA17:04Seattle/Tacoma Intl

20h 56m

1 stop

SYD07:00Sydney Kingsford Smith

26 Aug

SYD09:30Sydney Kingsford Smith

28h 45m

2 stops

SEA21:15Seattle/Tacoma Intl

$1,416

United Airlines

9 Aug

SEA05:00Seattle/Tacoma Intl

33h 00m

2 stops

SYD07:00Sydney Kingsford Smith

24 Aug

SYD09:30Sydney Kingsford Smith

41h 31m

2 stops

SEA10:01Seattle/Tacoma Intl

$1,423

United Airlines

26 July

SEA07:00Seattle/Tacoma Intl

30h 55m

1 stop

SYD06:55Sydney Kingsford Smith

9 Aug

SYD09:30Sydney Kingsford Smith

28h 40m

2 stops

SEA21:10Seattle/Tacoma Intl

$1,426

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 20/10

11:06-07:30

1 stop26h 24m

Sydney Kingsford Smith

Tue 27/10

14:00-18:26

2 stops22h 26m

$1,340

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 12/10

11:06-07:30

1 stop26h 24m

Sydney Kingsford Smith

Wed 28/10

14:00-18:26

2 stops22h 26m

$1,375

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 23/8

10:40-09:25

2 stops29h 45m

Sydney Kingsford Smith

Mon 19/10

12:45-18:32

2 stops23h 47m

$1,383

Fastest return journey

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 23/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Wed 21/10

14:15-18:26

2 stops22h 11m

$1,386

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 16/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Wed 14/10

12:45-18:32

2 stops23h 47m

$1,393

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Tue 18/8

20:55-14:25

1 stop34h 30m

$1,395

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 18/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Tue 13/10

14:15-18:26

2 stops22h 11m

$1,398

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 17/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Wed 14/10

14:15-18:26

2 stops22h 11m

$1,399

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/8

16:30-09:25

1 stop23h 55m

Sydney Kingsford Smith

Tue 18/8

20:55-18:32

2 stops38h 37m

$1,400

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 16/8

16:30-19:10

1 stop33h 40m

Sydney Kingsford Smith

Thu 15/10

14:15-18:26

2 stops22h 11m

$1,403

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 typical for flights on this route.

Typical prices usually range from $1,179 to $1,850.
The lowest price recently found on this route was $1,340.

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 $1,035. 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 $1,206.

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 $1,568 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 $1,329 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of July 2026, prices for Seattle to Sydney flights are approximately 1% 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

Fastest flight time	17h 45m
Direct flights	None

The fastest flight from Seattle to Sydney takes 17h 45m

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 17h 45m.
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?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport is 1 as of July 2026.
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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Sydney is United Airlines (100% of total bookings).

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 Airlines	PriceFrom $1,192	Free cancellation	Rating 7.4 10,026 reviews		Search United Airlines flights

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Manly

Lithgow

Coogee

Leura

Cronulla

Randwick

Bondi Beach

Charlestown

Swansea

Newport

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.