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

Flights via Dallas (DFW) offer the lowest average round-trip price of $804.

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

Los Angeles (LAX) was the most common stop: 39% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to Sydney?

United Airlines, Air Canada and Delta are the top three most popular airlines that fly to Sydney from Seattle according to our data. United Airlines is the first choice among our users, with 32% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 8 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

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

Flights connecting via San Francisco (SFO) have the shortest average one-way travel time: 19h 17m.

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

ANA, Philippine Airlines, and Hawaiian Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

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

San Francisco (SFO) has the shortest average layover time for this route: 2h 12m.

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 are updated 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 8 as of October 2025.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. 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 license 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.

$281 Cheap Flights from Seattle to Sydney in 2025/26

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11:55 pm - 9:45 amSEA-SYD

40h 50m1 stop

11:35 am - 7:35 pmSYD-SEA

25h 00m1 stop

$828Philippine Airlines

Find Deal

Fri, Apr 10 - Wed, Apr 15

10:30 pm - 9:50 amSEA-SYD

41h 20m1 stop

11:35 am - 6:40 pmSYD-SEA

26h 05m1 stop

$846Philippine Airlines

Find Deal

Wed, Oct 29 - Fri, Nov 7

11:35 pm - 9:50 amSEA-SYD

40h 15m1 stop

11:35 am - 7:40 pmSYD-SEA

26h 05m1 stop

$847Philippine Airlines

Find Deal

Fri, Oct 24 - Sun, Nov 2

9:30 pm - 9:50 amSEA-SYD

41h 20m1 stop

11:35 am - 7:40 pmSYD-SEA

26h 05m1 stop

$849Philippine Airlines

Find Deal

Fri, Feb 27 - Wed, Mar 18

7:00 am - 7:45 pmSEA-SYD

17h 45m1 stop

9:40 pm - 8:15 pmSYD-SEA

17h 35m1 stop

$868Hawaiian Airlines

Find Deal

Sat, Jan 31 - Thu, Feb 19

4:55 pm - 7:45 pmSEA-SYD

32h 50m1 stop

9:40 pm - 10:56 pmSYD-SEA

19h 16m1 stop

$869Hawaiian Airlines

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Sun, Oct 26 - Thu, Oct 30

7:20 am - 7:45 pmSEA-SYD

17h 25m1 stop

9:40 pm - 8:15 pmSYD-SEA

17h 35m1 stop

$877Alaska Airlines

Find Deal

Wed, Feb 25 - Sat, Mar 7

7:00 am - 7:45 pmSEA-SYD

17h 45m1 stop

9:40 pm - 5:15 amSYD-SEA

26h 35m1 stop

$889Alaska Airlines

Find Deal

Fri, Feb 6 - Fri, Feb 27

9:30 pm - 9:50 amSEA-SYD

41h 20m1 stop

7:05 am - 10:09 pmSYD-SEA

34h 04m2 stops

$1,008Multiple Airlines

Find Deal

Thu, Nov 27 - Thu, Dec 4

9:30 pm - 9:50 amSEA-SYD

41h 20m1 stop

2:10 pm - 4:48 pmSYD-SEA

21h 38m2 stops

$1,029Multiple Airlines

Find Deal

Sun, Nov 9 - Tue, Nov 25

United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

United Airlines

Oct 22

SEA11:10 amSeattle/Tacoma Intl

26h 50m

2 stops

SYD8:00 amSydney Kingsford Smith

Nov 5

SYD11:20 amSydney Kingsford Smith

28h 31m

2 stops

SEA8:51 pmSeattle/Tacoma Intl

$1,180

Find similar

United Airlines

Oct 26

SEA12:30 pmSeattle/Tacoma Intl

26h 35m

2 stops

SYD9:05 amSydney Kingsford Smith

Nov 9

SYD11:50 amSydney Kingsford Smith

25h 20m

2 stops

SEA6:10 pmSeattle/Tacoma Intl

$1,186

Find similar

United Airlines

Oct 28

SEA5:20 pmSeattle/Tacoma Intl

21h 55m

1 stop

SYD9:15 amSydney Kingsford Smith

Nov 17

SYD11:20 amSydney Kingsford Smith

23h 50m

1 stop

SEA4:10 pmSeattle/Tacoma Intl

$1,190

Find similar

Hawaiian Airlines flights from Seattle to Sydney

Our best Hawaiian Airlines deals on Seattle to Sydney flight tickets

Hawaiian Airlines

Oct 16

SEA7:44 amSeattle/Tacoma Intl

18h 01m

1 stop

SYD7:45 pmSydney Kingsford Smith

Oct 30

SYD9:40 pmSydney Kingsford Smith

19h 16m

1 stop

SEA10:56 pmSeattle/Tacoma Intl

$861

Find similar

Hawaiian Airlines

Jan 31

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Feb 19

SYD9:40 pmSydney Kingsford Smith

17h 35m

1 stop

SEA8:15 pmSeattle/Tacoma Intl

$868

Find similar

Hawaiian Airlines

Oct 26

SEA4:55 pmSeattle/Tacoma Intl

32h 50m

1 stop

SYD7:45 pmSydney Kingsford Smith

Oct 30

SYD9:40 pmSydney Kingsford Smith

19h 16m

1 stop

SEA10:56 pmSeattle/Tacoma Intl

$869

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 4/10

11:55 pm-9:45 am

1 stop40h 50m

Sydney Kingsford Smith

Wed 4/15

11:35 am-7:35 pm

1 stop25h 00m

$828

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 10/29

10:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Fri 11/7

11:35 am-6:40 pm

1 stop26h 05m

$846

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 10/24

11:35 pm-9:50 am

1 stop40h 15m

Sydney Kingsford Smith

Sun 11/2

11:35 am-7:40 pm

1 stop26h 05m

$847

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/27

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Wed 3/18

11:35 am-7:40 pm

1 stop26h 05m

$849

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 1/31

7:00 am-7:45 pm

1 stop17h 45m

Sydney Kingsford Smith

Thu 2/19

9:40 pm-8:15 pm

1 stop17h 35m

$868

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 10/26

4:55 pm-7:45 pm

1 stop32h 50m

Sydney Kingsford Smith

Thu 10/30

9:40 pm-10:56 pm

1 stop19h 16m

$869

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/25

7:20 am-7:45 pm

1 stop17h 25m

Sydney Kingsford Smith

Sat 3/7

9:40 pm-8:15 pm

1 stop17h 35m

$877

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/6

7:00 am-7:45 pm

1 stop17h 45m

Sydney Kingsford Smith

Fri 2/27

9:40 pm-5:15 am

1 stop26h 35m

$889

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 11/27

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Thu 12/4

7:05 am-10:09 pm

2 stops34h 04m

$1,008

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 11/9

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Tue 11/25

2:10 pm-4:48 pm

2 stops21h 38m

$1,029

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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

Prices

Airlines

Layovers

What is the cheapest month to fly to Sydney?

In general, September is the cheapest month to fly from Seattle to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $897. If you are unable to visit Sydney during the month of September, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $958.

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

The cheapest day to depart from Seattle to Sydney is on a Tuesday when prices can be found for as low as $1,078. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,156.

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 evening. momondo users have found flights departing from Seattle to Sydney in the evening for as low as $1,078. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the morning, with an average ticket price of $1,152. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,078 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Seattle for as low as $883 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of October 2025, prices for Seattle to Sydney flights are approximately 44% 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 round-trip 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?
Sydney Kingsford Smith is 7743.7 mi away from Seattle/Tacoma Intl. In terms of flight time, this usually takes a little over 17h 25m.
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 are updated 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 8 as of October 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. 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 license 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 (26% of total bookings). The next most popular airlines are Air Canada (26%), Delta (15%), and Alaska Airlines (14%).

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
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 8.0 11,079 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,294 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 920 reviews	Search Qantas Airways flights
ANA	PriceFrom $794	Free Cancellation	Rating 8.4 984 reviews	Search ANA flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,040 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $820	Free Cancellation	Rating 7.8 2,779 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $834	Free Cancellation	Rating 7.4 8,975 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 7,972 reviews	Search Delta flights

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Wollongong

Randwick

Cronulla

Coogee

Manly

Penrith

Leura

Lithgow

Charlestown

Terrigal

Swansea

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Sydney. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Sydney from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from Seattle.

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

Yes. momondo can track prices for Seattle to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Cheap flights from Seattle to Sydney from $281

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 12/9. 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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United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

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Our best Hawaiian Airlines deals on Seattle to Sydney flight tickets

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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 cheapest month to fly to Sydney?

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

The cheapest day to depart from Seattle to Sydney is on a Tuesday when prices can be found for as low as $1,078. The most expensive day to fly to Sydney is Thursday, with ticket prices averaging around $1,156.

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

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

How have Seattle to Sydney flight prices changed over time?

As of October 2025, prices for Seattle to Sydney flights are approximately 44% cheaper when compared to flights at the same time last year.

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

ANA, Philippine Airlines, and Hawaiian Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

What airlines fly to Sydney?

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

Los Angeles (LAX) was the most common stop: 39% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Dallas (DFW) offer the lowest average round-trip price of $804.

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

Flights connecting via San Francisco (SFO) have the shortest average one-way travel time: 19h 17m.

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

San Francisco (SFO) has the shortest average layover time for this route: 2h 12m.

When to book flights from Seattle to Sydney

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

How far is Seattle/Tacoma Intl to Sydney Kingsford Smith by plane?

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

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?

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

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

Traveling to a place near Sydney?

Why use momondo?

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

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

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

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

An easier way to manage your Sydney trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Australia

Airports servicing New South Wales