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

Philippine Airlines and Air Canada 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 18m.

What airlines fly to Sydney?

United Airlines, Air Canada and Alaska Airlines 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 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: 37% of momondo users choosing 1-stop flights on this route connected there.

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 42m.

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

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

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 January 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.

$377 Cheap Flights from Seattle to Sydney in 2026

Q: 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 $1,141 to $1,511. The lowest price recently found on this route was $1,090.

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Find the cheapest flights from Seattle to Sydney

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One-way

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3:40 pm - 2:40 pm

SEA

SYD

28h 00m2 stops

9:30 pm - 3:01 pm

SYD

SEA

35h 31m2 stops

$1,090Multiple Airlines

Tue, Feb 17 - Tue, Mar 10

8:00 pm - 9:35 am

SEA

SYD

18h 35m1 stop

11:20 am - 3:01 pm

SYD

SEA

22h 41m1 stop

$1,091Air Canada

Sat, Feb 14 - Mon, Mar 2

8:00 pm - 9:35 am

SEA

SYD

18h 35m1 stop

11:20 am - 2:31 pm

SYD

SEA

22h 11m1 stop

$1,092Air Canada

Sat, Feb 7 - Tue, Feb 24

8:00 pm - 1:00 pm

SEA

SYD

22h 00m2 stops

8:30 am - 9:15 am

SYD

SEA

19h 45m2 stops

$1,093Multiple Airlines

Mon, Feb 9 - Mon, Feb 23

11:32 am - 7:25 am

SEA

SYD

24h 53m1 stop

5:45 pm - 6:57 pm

SYD

SEA

19h 12m1 stop

$1,094Multiple Airlines

Sat, Feb 28 - Thu, Mar 12

9:28 am - 7:25 am

SEA

SYD

26h 57m1 stop

12:15 pm - 4:05 pm

SYD

SEA

45h 50m2 stops

$1,096Multiple Airlines

Fri, Feb 27 - Thu, Mar 12

10:10 am - 7:20 am

SEA

SYD

28h 10m1 stop

6:00 am - 9:33 am

SYD

SEA

20h 33m2 stops

$1,097Multiple Airlines

Sat, Apr 4 - Sun, Apr 12

8:00 pm - 9:35 am

SEA

SYD

18h 35m1 stop

8:00 am - 9:31 am

SYD

SEA

19h 31m2 stops

$1,098Air Canada

Fri, Feb 27 - Sun, Mar 22

8:00 pm - 6:05 pm

SEA

SYD

27h 05m2 stops

9:00 am - 2:31 pm

SYD

SEA

24h 31m2 stops

$1,099Air Canada

Wed, Feb 11 - Wed, Feb 18

10:03 am - 7:25 am

SEA

SYD

26h 22m1 stop

5:45 pm - 7:58 pm

SYD

SEA

20h 13m1 stop

$1,102Multiple Airlines

Sun, Feb 22 - Mon, Mar 9

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

Feb 14

SEA8:00 pmSeattle/Tacoma Intl

18h 35m

1 stop

SYD9:35 amSydney Kingsford Smith

Feb 22

SYD11:20 amSydney Kingsford Smith

22h 11m

1 stop

SEA2:31 pmSeattle/Tacoma Intl

$1,091

Find similar

Air Canada

Feb 7

SEA8:00 pmSeattle/Tacoma Intl

18h 35m

1 stop

SYD9:35 amSydney Kingsford Smith

Feb 24

SYD11:20 amSydney Kingsford Smith

22h 11m

1 stop

SEA2:31 pmSeattle/Tacoma Intl

$1,092

Find similar

Air Canada

Mar 13

SEA8:00 pmSeattle/Tacoma Intl

18h 35m

1 stop

SYD8:35 amSydney Kingsford Smith

Mar 22

SYD7:00 amSydney Kingsford Smith

20h 31m

2 stops

SEA9:31 amSeattle/Tacoma Intl

$1,098

Find similar

Alaska Airlines flights from Seattle to Sydney

Our best Alaska Airlines deals on Seattle to Sydney flight tickets

Alaska Airlines

Jan 13

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Oct 18

SYD8:45 pmSydney Kingsford Smith

19h 00m

1 stop

SEA9:45 pmSeattle/Tacoma Intl

$1,138

Find similar

Alaska Airlines

Jan 6

SEA7:00 amSeattle/Tacoma Intl

17h 45m

1 stop

SYD7:45 pmSydney Kingsford Smith

Jan 14

SYD9:40 pmSydney Kingsford Smith

18h 20m

1 stop

SEA9:00 pmSeattle/Tacoma Intl

$1,237

Find similar

Alaska Airlines

Jan 6

SEA5:50 pmSeattle/Tacoma Intl

30h 55m

1 stop

SYD7:45 pmSydney Kingsford Smith

Feb 6

SYD9:40 pmSydney Kingsford Smith

18h 22m

1 stop

SEA9:02 pmSeattle/Tacoma Intl

$1,254

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 2/17

3:40 pm-2:40 pm

2 stops28h 00m

Sydney Kingsford Smith

Tue 3/10

9:30 pm-3:01 pm

2 stops35h 31m

$1,090

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/14

8:00 pm-9:35 am

1 stop18h 35m

Sydney Kingsford Smith

Mon 3/2

11:20 am-3:01 pm

1 stop22h 41m

$1,091

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/7

8:00 pm-9:35 am

1 stop18h 35m

Sydney Kingsford Smith

Tue 2/24

11:20 am-2:31 pm

1 stop22h 11m

$1,092

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 2/9

8:00 pm-1:00 pm

2 stops22h 00m

Sydney Kingsford Smith

Mon 2/23

8:30 am-9:15 am

2 stops19h 45m

$1,093

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/28

11:32 am-7:25 am

1 stop24h 53m

Sydney Kingsford Smith

Thu 3/12

5:45 pm-6:57 pm

1 stop19h 12m

$1,094

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/27

9:28 am-7:25 am

1 stop26h 57m

Sydney Kingsford Smith

Thu 3/12

12:15 pm-4:05 pm

2 stops45h 50m

$1,096

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 4/4

10:10 am-7:20 am

1 stop28h 10m

Sydney Kingsford Smith

Sun 4/12

6:00 am-9:33 am

2 stops20h 33m

$1,097

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 2/27

8:00 pm-9:35 am

1 stop18h 35m

Sydney Kingsford Smith

Sun 3/22

8:00 am-9:31 am

2 stops19h 31m

$1,098

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 2/11

8:00 pm-6:05 pm

2 stops27h 05m

Sydney Kingsford Smith

Wed 2/18

9:00 am-2:31 pm

2 stops24h 31m

$1,099

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 2/22

10:03 am-7:25 am

1 stop26h 22m

Sydney Kingsford Smith

Mon 3/9

5:45 pm-7:58 pm

1 stop20h 13m

$1,102

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?

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 $846. 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 $878.

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 $1,069 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 $877 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of January 2026, prices for Seattle to Sydney flights are approximately 38% 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

Fastest flight time	19h 00m
Direct flights	None

The fastest flight from Seattle to Sydney takes 19h 00m

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 19h 00m.
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 January 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 United Airlines (24% of total bookings). The next most popular airlines are Air Canada (23%), Alaska Airlines (15%), and Delta (12%).

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 1,055 reviews	Search ANA flights
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 8.0 11,605 reviews	Search Alaska Airlines flights
Philippine Airlines	PriceFrom $758	Free Cancellation	Rating 7.3 946 reviews	Search Philippine Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,574 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 961 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,075 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,823 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $830	Free Cancellation	Rating 7.4 9,129 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,023 reviews	Search Delta flights

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Manly

Penrith

Cronulla

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Leura

Charlestown

Terrigal

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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 $377

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 3/8. 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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Air Canada flights from Seattle to Sydney

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Our best Alaska Airlines deals on Seattle to Sydney flight tickets

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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 to Sydney?

How have Seattle to Sydney flight prices changed over time?

As of January 2026, prices for Seattle to Sydney flights are approximately 38% 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?

Philippine Airlines and Air Canada 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: 37% 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 42m.

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.

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

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