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

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

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

Los Angeles (LAX) was the most common stop: 63% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to Sydney?

Air Canada, Delta and Qantas Airways 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 42% 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 Los Angeles (LAX) have the shortest average one-way travel time: 19h 59m.

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

Flights via Manila (MNL) offer the lowest average round-trip price of $622.

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 27m.

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 November 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.

$486 Cheap Flights from Seattle to Sydney in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Sydney

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9:30 pm - 9:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 am - 7:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$992Philippine Airlines

Mon, Mar 1 - Wed, Mar 17

9:30 pm - 9:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 am - 7:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$1,002Philippine Airlines

Mon, Mar 1 - Wed, Mar 17

6:55 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 30m1 stop Los Angeles

11:15 am - 8:51 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

39h 36m1 stop Los Angeles

$1,096Alaska Airlines

Thu, Mar 18 - Mon, Mar 22

3:00 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 25m1 stop Los Angeles

11:15 am - 1:56 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 41m2 stops Los Angeles Portland

$1,099Alaska Airlines

Fri, Feb 26 - Mon, Mar 15

5:59 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 01m1 stop Los Angeles

11:10 am - 1:08 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 58m1 stop Los Angeles

$1,172Qantas Airways

Tue, Nov 17 - Tue, Dec 1

6:55 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 05m1 stop Los Angeles

10:10 am - 2:27 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Los Angeles

$1,172Qantas Airways

Mon, Mar 22 - Wed, Mar 31

7:00 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

30h 35m2 stops Los Angeles Auckland Intl

2:05 pm - 9:57 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 52m2 stops Auckland Intl Vancouver Intl

$1,180Air New Zealand

Wed, Jan 27 - Sun, Feb 7

10:21 am - 12:50 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 29m2 stops San Francisco Auckland Intl

9:55 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

27h 27m2 stops Auckland Intl Vancouver Intl

$1,180Air New Zealand

Tue, Jan 26 - Tue, Feb 2

1:35 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 25m1 stop Los Angeles

2:05 pm - 4:56 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 51m1 stop Dallas/Fort Worth

$1,187American Airlines

Mon, Nov 16 - Wed, Dec 2

12:37 pm - 6:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 18m1 stop Dallas/Fort Worth

11:10 am - 3:50 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 40m1 stop Los Angeles

$1,194American Airlines

Wed, Dec 2 - Wed, Dec 9

Cheap last minute flights

Enter your travel dates to find the best prices.

9:30 pm - 9:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 am - 6:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$1,097Philippine Airlines

Mon, Nov 9 - Mon, Nov 16

9:30 pm - 9:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

41h 20m1 stop Manila Ninoy Aquino Intl

11:30 am - 6:45 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 15m1 stop Manila Ninoy Aquino Intl

$1,097Philippine Airlines

Mon, Nov 9 - Wed, Nov 18

4:59 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 01m1 stop Los Angeles

11:10 am - 1:00 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 50m1 stop Los Angeles

$1,174Qantas Airways

Mon, Nov 9 - Tue, Nov 17

4:24 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 36m1 stop Los Angeles

11:15 am - 1:08 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 53m1 stop Los Angeles

$1,195American Airlines

Wed, Nov 11 - Mon, Nov 30

1:35 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 50m1 stop Los Angeles

2:05 pm - 4:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 54m1 stop Dallas/Fort Worth

$1,195American Airlines

Wed, Nov 11 - Mon, Nov 30

3:13 pm - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 17m1 stop Los Angeles

10:40 am - 8:09 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 29m1 stop Los Angeles

$1,198Delta

Wed, Nov 11 - Wed, Nov 18

4:39 pm - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 26m1 stop Los Angeles

11:50 am - 12:20 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 30m1 stop San Francisco

$1,198United Airlines

Mon, Nov 9 - Tue, Nov 17

9:05 am - 9:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 15m1 stop San Francisco

9:15 am - 7:17 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

29h 02m1 stop Houston George Bush Intcntl

$1,198United Airlines

Tue, Nov 10 - Wed, Nov 18

5:35 am - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 55m2 stops Salt Lake City Los Angeles

10:40 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 25m1 stop Los Angeles

$1,203Delta

Mon, Nov 9 - Wed, Nov 18

3:59 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 01m1 stop Los Angeles

11:10 am - 12:20 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

32h 10m1 stop Los Angeles

$1,223Qantas Airways

Wed, Nov 11 - Mon, Nov 30

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Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets

Alaska Airlines

Mar 18

SEA6:55 pmSeattle/Tacoma Intl

41h 30m

1 stop

SYD6:25 amSydney Kingsford Smith

Mar 22

SYD11:15 amSydney Kingsford Smith

39h 36m

1 stop

SEA8:51 amSeattle/Tacoma Intl

$1,096

Alaska Airlines

Feb 26

SEA3:00 pmSeattle/Tacoma Intl

20h 25m

1 stop

SYD6:25 amSydney Kingsford Smith

Mar 15

SYD11:15 amSydney Kingsford Smith

20h 41m

2 stops

SEA1:56 pmSeattle/Tacoma Intl

$1,099

Alaska Airlines

Feb 9

SEA2:22 pmSeattle/Tacoma Intl

21h 03m

1 stop

SYD6:25 amSydney Kingsford Smith

Feb 28

SYD11:15 amSydney Kingsford Smith

19h 36m

1 stop

SEA11:51 amSeattle/Tacoma Intl

$1,113

Philippine Airlines flights from Seattle to Sydney

Our best Philippine Airlines deals on Seattle to Sydney flight tickets

Philippine Airlines

Mar 1

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 17

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$992

Philippine Airlines

Mar 1

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 10

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$1,002

Philippine Airlines

Mar 1

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Mar 17

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA7:45 pmSeattle/Tacoma Intl

$1,003

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Wed 3/17

11:30 am-7:45 pm

1 stop26h 15m

$992

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

9:30 pm-9:50 am

1 stop41h 20m

Sydney Kingsford Smith

Wed 3/17

11:30 am-7:45 pm

1 stop26h 15m

$1,002

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 3/18

6:55 pm-6:25 am

1 stop41h 30m

Sydney Kingsford Smith

Mon 3/22

11:15 am-8:51 am

1 stop39h 36m

$1,096

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 2/26

3:00 pm-6:25 am

1 stop20h 25m

Sydney Kingsford Smith

Mon 3/15

11:15 am-1:56 pm

2 stops20h 41m

$1,099

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 11/17

5:59 pm-9:00 am

1 stop20h 01m

Sydney Kingsford Smith

Tue 12/1

11:10 am-1:08 pm

1 stop20h 58m

$1,172

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/22

6:55 pm-9:00 am

1 stop20h 05m

Sydney Kingsford Smith

Wed 3/31

10:10 am-2:27 pm

1 stop22h 17m

$1,172

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 1/27

7:00 am-8:35 am

2 stops30h 35m

Sydney Kingsford Smith

Sun 2/7

2:05 pm-9:57 pm

2 stops26h 52m

$1,180

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 1/26

10:21 am-12:50 pm

2 stops31h 29m

Sydney Kingsford Smith

Tue 2/2

9:55 am-6:22 pm

2 stops27h 27m

$1,180

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/16

1:35 pm-9:00 am

1 stop24h 25m

Sydney Kingsford Smith

Wed 12/2

2:05 pm-4:56 pm

1 stop21h 51m

$1,187

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 12/2

12:37 pm-6:55 am

1 stop23h 18m

Sydney Kingsford Smith

Wed 12/9

11:10 am-3:50 pm

1 stop23h 40m

$1,194

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 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 $1,064 to $1,310.
The lowest price recently found on this route was $992.

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 $1,044. If you are unable to visit Sydney during the month of September, then departing from Seattle during the month August is also very affordable. Most momondo users find prices during this month for around $1,089.

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 $1,207 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 $1,021 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of November 2026, prices for Seattle to Sydney flights are approximately 55% 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

Best Price Found	$486
Fastest flight time	17h 45m
Direct flights	None

The best one-way flight to Sydney from Seattle in the past 72 hours is $486. The best round-trip flight deal from Seattle to Sydney found on momondo in the last 72 hours is $992.

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?
Sydney Kingsford Smith is 7743.7 mi away from Seattle/Tacoma Intl. 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 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 November 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 (32% of total bookings). The next most popular airlines are Delta (16%), Qantas Airways (15%), and United 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
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,122 reviews	Search Qantas Airways flights
Delta	PriceFrom $835	Free Cancellation	Rating 7.8 8,698 reviews	Search Delta flights
United Airlines	PriceFrom $888	Free Cancellation	Rating 7.3 10,461 reviews	Search United Airlines flights
Air Canada	PriceFrom $938	Free Cancellation	Rating 7.1 11,861 reviews	Search Air Canada flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 682 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,228 reviews	Search American Airlines flights
ANA	PriceFrom $1,001	Free Cancellation	Rating 8.3 1,339 reviews	Search ANA flights
Alaska Airlines	PriceFrom $1,091	Free Cancellation	Rating 7.9 13,140 reviews	Search Alaska Airlines flights

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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 $486

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 2/28. 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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Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets

Philippine Airlines flights from Seattle to Sydney

Our best Philippine Airlines deals on Seattle to Sydney flight tickets

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

What is the cheapest month to fly to Sydney?

How far in advance should I book a flight from Seattle 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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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.

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

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According to popular flight searches on momondo this year

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