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 18m.

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: 20h 01m.

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

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

What airlines fly to Sydney?

Air Canada, United Airlines and Alaska Airlines are the top three most popular airlines that fly to Sydney from Seattle according to our data. Air Canada is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 9 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

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

Los Angeles (LAX) was the most common stop: 44% of momondo users choosing 1-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 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 9 as of March 2026.

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.

$410 Cheap Flights from Seattle to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Seattle to Sydney

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:40 pm - 7:05 am

SEA

SYD

19h 25m

1 stop

9:10 am - 10:58 pm

SYD

SEA

30h 48m

1 stop

$876Qantas Airways

Sun, Apr 26 - Sun, May 3

7:06 pm - 7:30 am

SEA

SYD

19h 24m

1 stop

5:50 pm - 10:52 pm

SYD

SEA

22h 02m

1 stop

$877Qantas Airways

Mon, Apr 27 - Mon, May 4

5:06 pm - 11:50 am

SEA

SYD

25h 44m

2 stops

1:20 pm - 6:56 pm

SYD

SEA

22h 36m

2 stops

$879Multiple Airlines

Thu, Apr 30 - Wed, May 13

11:41 am - 7:05 am

SEA

SYD

26h 24m

2 stops

9:10 am - 6:07 pm

SYD

SEA

25h 57m

1 stop

$885American Airlines

Mon, Apr 27 - Sun, May 10

9:15 pm - 7:30 am

SEA

SYD

41h 15m

1 stop

9:10 am - 11:52 am

SYD

SEA

19h 42m

1 stop

$887Multiple Airlines

Sat, Apr 18 - Mon, May 11

3:40 pm - 7:20 am

SEA

SYD

22h 40m

1 stop

9:20 am - 3:05 pm

SYD

SEA

22h 45m

1 stop

$888Air Canada

Mon, Apr 13 - Wed, Apr 29

6:14 pm - 7:05 am

SEA

SYD

19h 51m

1 stop

5:50 pm - 9:59 pm

SYD

SEA

21h 09m

1 stop

$889Multiple Airlines

Mon, May 18 - Wed, Jun 3

5:06 pm - 7:05 am

SEA

SYD

20h 59m

1 stop

9:10 am - 1:03 pm

SYD

SEA

20h 53m

1 stop

$890Qantas Airways

Wed, May 6 - Wed, May 27

6:40 pm - 7:05 am

SEA

SYD

19h 25m

1 stop

5:50 pm - 7:53 pm

SYD

SEA

19h 03m

1 stop

$892Qantas Airways

Sun, Apr 19 - Mon, May 11

6:40 pm - 7:05 am

SEA

SYD

19h 25m

1 stop

9:10 am - 1:01 pm

SYD

SEA

20h 51m

1 stop

$893Qantas Airways

Sun, Apr 19 - Tue, May 5

Qantas Airways flights from Seattle to Sydney

Our best Qantas Airways deals on Seattle to Sydney flight tickets

Qantas Airways

Apr 29

SEA7:06 pmSeattle/Tacoma Intl

18h 59m

1 stop

SYD7:05 amSydney Kingsford Smith

May 6

SYD9:10 amSydney Kingsford Smith

23h 40m

1 stop

SEA3:50 pmSeattle/Tacoma Intl

$863

Qantas Airways

Apr 26

SEA6:40 pmSeattle/Tacoma Intl

19h 25m

1 stop

SYD7:05 amSydney Kingsford Smith

May 3

SYD9:10 amSydney Kingsford Smith

30h 48m

1 stop

SEA10:58 pmSeattle/Tacoma Intl

$876

Qantas Airways

Apr 27

SEA7:06 pmSeattle/Tacoma Intl

19h 24m

1 stop

SYD7:30 amSydney Kingsford Smith

May 4

SYD5:50 pmSydney Kingsford Smith

22h 02m

1 stop

SEA10:52 pmSeattle/Tacoma Intl

$877

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

Apr 13

SEA3:40 pmSeattle/Tacoma Intl

22h 40m

1 stop

SYD7:20 amSydney Kingsford Smith

Apr 29

SYD9:20 amSydney Kingsford Smith

22h 45m

1 stop

SEA3:05 pmSeattle/Tacoma Intl

$888

Air Canada

Apr 19

SEA10:20 amSeattle/Tacoma Intl

28h 00m

1 stop

SYD7:20 amSydney Kingsford Smith

May 5

SYD6:00 amSydney Kingsford Smith

20h 50m

2 stops

SEA9:50 amSeattle/Tacoma Intl

$920

Air Canada

Jul 28

SEA7:20 pmSeattle/Tacoma Intl

22h 20m

2 stops

SYD10:40 amSydney Kingsford Smith

Aug 11

SYD9:20 amSydney Kingsford Smith

17h 32m

1 stop

SEA9:52 amSeattle/Tacoma Intl

$925

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/26

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Sun 5/3

9:10 am-10:58 pm

1 stop30h 48m

$876

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/27

7:06 pm-7:30 am

1 stop19h 24m

Sydney Kingsford Smith

Mon 5/4

5:50 pm-10:52 pm

1 stop22h 02m

$877

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 4/30

5:06 pm-11:50 am

2 stops25h 44m

Sydney Kingsford Smith

Wed 5/13

1:20 pm-6:56 pm

2 stops22h 36m

$879

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/27

11:41 am-7:05 am

2 stops26h 24m

Sydney Kingsford Smith

Sun 5/10

9:10 am-6:07 pm

1 stop25h 57m

$885

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 4/18

9:15 pm-7:30 am

1 stop41h 15m

Sydney Kingsford Smith

Mon 5/11

9:10 am-11:52 am

1 stop19h 42m

$887

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 4/13

3:40 pm-7:20 am

1 stop22h 40m

Sydney Kingsford Smith

Wed 4/29

9:20 am-3:05 pm

1 stop22h 45m

$888

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/18

6:14 pm-7:05 am

1 stop19h 51m

Sydney Kingsford Smith

Wed 6/3

5:50 pm-9:59 pm

1 stop21h 09m

$889

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 5/6

5:06 pm-7:05 am

1 stop20h 59m

Sydney Kingsford Smith

Wed 5/27

9:10 am-1:03 pm

1 stop20h 53m

$890

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Mon 5/11

5:50 pm-7:53 pm

1 stop19h 03m

$892

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 4/19

6:40 pm-7:05 am

1 stop19h 25m

Sydney Kingsford Smith

Tue 5/5

9:10 am-1:01 pm

1 stop20h 51m

$893

Flights are sorted by cheapest round-trip 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

Layovers

What is the cheapest month to fly to Sydney?

In general, August 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 $824. If you are unable to visit Sydney during the month of August, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $857.

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 $1,071 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 $902 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of March 2026, prices for Seattle to Sydney flights are approximately 3% more expensive 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

Fastest flight time	18h 45m
Direct flights	None

The fastest flight from Seattle to Sydney takes 18h 45m

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

Search flight deals

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 18h 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 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 9 as of March 2026.
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 Air Canada (22% of total bookings). The next most popular airlines are United Airlines (18%), Alaska Airlines (17%), and Qantas Airways (11%).

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
ANA	PriceFrom $583	Free Cancellation	Rating 8.4 1,129 reviews	Search ANA flights
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 7.9 12,054 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,805 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $786	Free Cancellation	Rating 7.5 1,004 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,471 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,839 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $841	Free Cancellation	Rating 7.4 9,427 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,296 reviews	Search Delta flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	Search Alaska Airlines flights

Bondi Beach

Katoomba

Parramatta

Wollongong

Penrith

Coogee

Manly

Randwick

Leura

Lithgow

Cronulla

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.

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Tue 4/14

Tue 4/21

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia

Nearby airports

Airlines

Cabin classes

Other Australia destinations

Other flights from Seattle

Complete your trip

Feeling lucky

Cheap flights from Seattle to Sydney from $410

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 4/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Seattle to Sydney

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Qantas Airways flights from Seattle to Sydney

Our best Qantas Airways deals on Seattle to Sydney flight tickets

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

See travel insights to Sydney from

How to get the cheapest flight ticket from Seattle to Sydney

What is the cheapest month to fly to Sydney?

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

How have Seattle to Sydney flight prices changed over time?

What is the cheapest airline that flies 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?

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

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

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

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

Fastest flight time

Direct flights

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?

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

Fly your favorite airline to Sydney

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Sydney

List of cabin classes available on flights landing in Sydney. Availability may vary depending on flight origin and airline.

Popular cities in Australia

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Seattle

According to popular flight searches on momondo this year

Complete your trip to Sydney

Explore popular destinations other users love

According to popular flight searches on momondo this year