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

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

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 connection time from Seattle to Sydney?

San Francisco (SFO) has the shortest average layover time for this route: 2h 27m.

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 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.

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

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

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 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.

$501 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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One-way

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Cheap round-trip flights

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3:15 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

9:20 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 58m1 stop Vancouver Intl

$978Air Canada

Wed, Mar 24 - Wed, Apr 21

10:10 am - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Vancouver Intl

10:20 am - 9:15 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 55m1 stop Vancouver Intl

$978Air Canada

Mon, Mar 1 - Wed, Mar 17

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

19h 35m1 stop Vancouver Intl

6:00 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 18m2 stops Brisbane Vancouver Intl

$989Multiple Airlines

Wed, Mar 24 - Wed, Apr 21

7:00 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Vancouver Intl

6:20 am - 9:15 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 55m2 stops Brisbane Vancouver Intl

$989Multiple Airlines

Mon, Mar 1 - Wed, Mar 17

9:50 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 35m1 stop Los Angeles

11:15 am - 10:52 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 37m1 stop Los Angeles

$1,065Alaska Airlines

Sat, Feb 20 - Sun, Mar 7

10:10 am - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

28h 25m1 stop Vancouver Intl

11:20 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,089Air New Zealand

Mon, Feb 1 - Mon, Feb 8

10:07 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 18m1 stop Los Angeles

11:15 am - 11:03 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 48m1 stop Los Angeles

$1,093Alaska Airlines

Sat, Nov 14 - Fri, Nov 20

3:15 pm - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

10:20 am - 9:18 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

16h 58m1 stop Vancouver Intl

$1,106Air New Zealand

Mon, Mar 22 - Mon, Mar 29

11:30 am - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 00m2 stops Salt Lake City Los Angeles

10:40 am - 2:43 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 03m2 stops Los Angeles Salt Lake City

$1,130Delta

Wed, Nov 25 - Wed, Dec 2

11:30 am - 8:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 00m2 stops Salt Lake City Los Angeles

10:40 am - 3:11 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 31m1 stop Los Angeles

$1,130Delta

Mon, Nov 23 - Wed, Dec 2

Cheap last minute flights

Enter your travel dates to find the best prices.

8:45 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Portland Los Angeles

9:40 pm - 11:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 19m2 stops Honolulu Kahului

$1,059Multiple Airlines

Thu, Nov 5 - Thu, Nov 12

12:00 pm - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 25m1 stop Los Angeles

9:40 pm - 11:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 19m2 stops Honolulu Kahului

$1,059Multiple Airlines

Thu, Nov 5 - Thu, Nov 12

11:30 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 55m1 stop Los Angeles

11:15 am - 10:58 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

18h 43m1 stop Los Angeles

$1,093Alaska Airlines

Thu, Nov 5 - Sat, Jan 23

11:33 am - 6:25 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 52m1 stop Los Angeles

11:15 am - 2:12 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 57m1 stop Los Angeles

$1,093Alaska Airlines

Sat, Oct 31 - Fri, Nov 6

12:20 pm - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 45m1 stop Los Angeles

11:50 am - 2:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 36m1 stop San Francisco

$1,162United Airlines

Mon, Nov 2 - Wed, Jan 13

8:30 am - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

29h 35m2 stops Denver Intl Los Angeles

11:50 am - 2:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 36m1 stop San Francisco

$1,166United Airlines

Mon, Nov 2 - Wed, Jan 13

6:00 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

31h 35m2 stops Los Angeles Auckland Intl

9:55 am - 9:59 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

31h 04m2 stops Auckland Intl Los Angeles

$1,233Air New Zealand

Mon, Nov 2 - Wed, Jan 13

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

32h 00m2 stops Salt Lake City Los Angeles

10:40 am - 12:30 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 50m2 stops Los Angeles Salt Lake City

$1,253Delta

Wed, Nov 4 - Sat, Jan 23

7:05 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 30m1 stop Vancouver Intl

11:20 am - 2:37 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 17m1 stop Vancouver Intl

$1,285Air Canada

Sun, Nov 1 - Wed, Nov 4

10:10 am - 8:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

27h 25m2 stops Vancouver Intl Auckland Intl

9:55 am - 9:57 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

31h 02m2 stops Auckland Intl Vancouver Intl

$5,026Air New Zealand

Thu, Nov 5 - Sun, Nov 15

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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

Nov 9

SEA9:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Nov 18

SYD11:30 amSydney Kingsford Smith

26h 15m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$1,071

Philippine Airlines

Mar 21

SEA10:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Apr 1

SYD11:35 amSydney Kingsford Smith

26h 00m

1 stop

SEA7:35 pmSeattle/Tacoma Intl

$1,083

Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets

Alaska Airlines

Feb 20

SEA9:50 amSeattle/Tacoma Intl

25h 35m

1 stop

SYD6:25 amSydney Kingsford Smith

Mar 7

SYD11:15 amSydney Kingsford Smith

18h 37m

1 stop

SEA10:52 amSeattle/Tacoma Intl

$1,065

Alaska Airlines

Oct 30

SEA11:33 amSeattle/Tacoma Intl

24h 52m

1 stop

SYD6:25 amSydney Kingsford Smith

Nov 12

SYD11:15 amSydney Kingsford Smith

25h 40m

1 stop

SEA5:55 pmSeattle/Tacoma Intl

$1,093

Alaska Airlines

Oct 30

SEA2:05 pmSeattle/Tacoma Intl

22h 20m

2 stops

SYD6:25 amSydney Kingsford Smith

Nov 12

SYD11:15 amSydney Kingsford Smith

20h 53m

2 stops

SEA1:08 pmSeattle/Tacoma Intl

$1,097

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/24

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Wed 4/21

9:20 am-9:18 am

1 stop16h 58m

$978

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Wed 3/17

10:20 am-9:15 am

1 stop16h 55m

$978

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 3/24

7:00 pm-8:35 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 4/21

6:00 am-9:18 am

2 stops20h 18m

$989

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/1

7:00 pm-9:35 am

1 stop19h 35m

Sydney Kingsford Smith

Wed 3/17

6:20 am-9:15 am

2 stops20h 55m

$989

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 2/20

9:50 am-6:25 am

1 stop25h 35m

Sydney Kingsford Smith

Sun 3/7

11:15 am-10:52 am

1 stop18h 37m

$1,065

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 2/1

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Mon 2/8

11:20 am-2:37 pm

1 stop22h 17m

$1,089

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 11/14

10:07 am-6:25 am

1 stop25h 18m

Sydney Kingsford Smith

Fri 11/20

11:15 am-11:03 am

1 stop18h 48m

$1,093

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 3/22

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 3/29

10:20 am-9:18 am

1 stop16h 58m

$1,106

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/25

11:30 am-8:30 am

2 stops26h 00m

Sydney Kingsford Smith

Wed 12/2

10:40 am-2:43 pm

2 stops23h 03m

$1,130

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/23

11:30 am-8:30 am

2 stops26h 00m

Sydney Kingsford Smith

Wed 12/2

10:40 am-3:11 pm

1 stop23h 31m

$1,130

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 $1,063 to $1,338.
The lowest price recently found on this route was $978.

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 $1,039. If you are unable to visit Sydney during the month of August, then departing from Seattle during the month September is also very affordable. Most momondo users find prices during this month for around $1,044.

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 $1,190 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 $983 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 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	$501
Fastest flight time	20h 26m
Direct flights	None

The best one-way flight to Sydney from Seattle in the past 72 hours is $501. The best round-trip flight deal from Seattle to Sydney found on momondo in the last 72 hours is $978.

The fastest flight from Seattle to Sydney takes 20h 26m

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 20h 26m.
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 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 (31% of total bookings). The next most popular airlines are Delta (15%), Qantas Airways (14%), 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
ANA	PriceFrom $583	Free Cancellation	Rating 8.3 1,338 reviews	Search ANA flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,122 reviews	Search Qantas Airways flights
Delta	PriceFrom $835	Free Cancellation	Rating 7.8 8,696 reviews	Search Delta flights
United Airlines	PriceFrom $888	Free Cancellation	Rating 7.3 10,453 reviews	Search United Airlines flights
Air Canada	PriceFrom $938	Free Cancellation	Rating 7.1 11,834 reviews	Search Air Canada flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 679 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,214 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $1,159	Free Cancellation	Rating 7.9 13,135 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 $501

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 3/10. 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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Philippine Airlines flights from Seattle to Sydney

Our best Philippine Airlines deals on Seattle to Sydney flight tickets

Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets

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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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