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

Flights via Manila (MNL) offer the lowest average round-trip price of $844.

What airlines fly to Sydney?

Air Canada, United Airlines and ANA 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 37% 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: 46% of momondo users choosing 1-stop flights on this route connected there.

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

United Airlines and Delta 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?

Los Angeles (LAX) has the shortest average layover time for this route: 2h 43m.

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 54m.

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 August 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.

$402 Cheap Flights from Seattle to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Sydney

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3:00 pm - 11:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

10:20 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$867Air Canada

Sun, Oct 11 - Sun, Oct 18

3:00 pm - 11:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 40m2 stops Vancouver Intl Brisbane

7:00 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 05m2 stops Brisbane Vancouver Intl

$880Air Canada

Sun, Oct 11 - Sun, Oct 18

7:15 pm - 8:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 05m1 stop Vancouver Intl

6:20 am - 9:17 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 57m2 stops Brisbane Vancouver Intl

$911Multiple Airlines

Sun, Oct 18 - Wed, Oct 28

7:05 pm - 1:40 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 35m2 stops Vancouver Intl Brisbane

11:20 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$919Multiple Airlines

Sat, Oct 31 - Sun, Nov 8

3:15 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$999Air New Zealand

Wed, Nov 18 - Mon, Nov 30

3:15 pm - 9:35 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

11:20 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 02m1 stop Vancouver Intl

$999Air New Zealand

Tue, Nov 17 - Mon, Nov 30

5:59 pm - 7:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

20h 06m1 stop Los Angeles

5:50 pm - 10:40 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 50m1 stop Los Angeles

$1,075Qantas Airways

Wed, Sep 23 - Wed, Sep 30

4:59 pm - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 31m1 stop Los Angeles

10:10 am - 12:16 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 06m1 stop Los Angeles

$1,076Qantas Airways

Wed, Sep 23 - Wed, Oct 7

3:30 pm - 6:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 50m1 stop San Francisco

11:50 am - 12:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 32m1 stop San Francisco

$1,081United Airlines

Wed, Dec 9 - Wed, Dec 23

4:35 pm - 7:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 25m1 stop Los Angeles

10:30 am - 11:35 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

19h 05m1 stop Los Angeles

$1,091United Airlines

Mon, Sep 28 - Tue, Oct 20

Cheap last minute flights

Enter your travel dates to find the best prices.

3:00 pm - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

23h 20m1 stop Vancouver Intl

9:20 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$901Air Canada

Sun, Aug 30 - Tue, Sep 15

7:20 pm - 10:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 20m2 stops Vancouver Intl Brisbane

9:20 am - 10:05 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 45m1 stop Vancouver Intl

$923Air Canada

Sun, Aug 30 - Tue, Sep 15

7:20 pm - 10:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 00m2 stops Vancouver Intl Brisbane

9:20 am - 6:32 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$962Multiple Airlines

Sun, Aug 30 - Tue, Sep 15

7:20 pm - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 00m1 stop Vancouver Intl

6:20 am - 9:27 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 07m2 stops Brisbane Vancouver Intl

$989Multiple Airlines

Mon, Aug 31 - Sun, Nov 15

5:50 am - 7:20 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

32h 30m1 stop Vancouver Intl

9:20 am - 6:32 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 12m1 stop Vancouver Intl

$1,000Air New Zealand

Mon, Aug 31 - Sun, Sep 6

7:35 pm - 6:55 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

18h 20m1 stop San Francisco

9:30 am - 9:15 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

28h 45m2 stops Los Angeles Denver Intl

$1,033United Airlines

Mon, Aug 31 - Wed, Sep 16

4:58 pm - 7:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 02m1 stop Los Angeles

10:20 am - 11:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

30h 06m1 stop San Francisco

$1,033United Airlines

Mon, Aug 31 - Wed, Sep 16

1:25 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 25m2 stops Salt Lake City Los Angeles

9:15 am - 6:36 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 21m2 stops Los Angeles Salt Lake City

$1,342Delta

Sun, Aug 30 - Tue, Sep 15

1:25 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 25m2 stops Salt Lake City Los Angeles

9:15 am - 4:50 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 35m2 stops Los Angeles Salt Lake City

$1,342Delta

Mon, Aug 31 - Wed, Sep 16

11:59 am - 7:30 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 31m2 stops Portland Los Angeles

5:50 pm - 9:39 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 49m1 stop Los Angeles

$1,477Alaska Airlines

Mon, Aug 31 - Wed, Sep 2

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Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

Oct 11

SEA3:00 pmSeattle/Tacoma Intl

26h 40m

2 stops

SYD11:40 amSydney Kingsford Smith

Oct 18

SYD10:20 amSydney Kingsford Smith

17h 45m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$867

Air Canada

Oct 11

SEA3:00 pmSeattle/Tacoma Intl

26h 40m

2 stops

SYD11:40 amSydney Kingsford Smith

Oct 18

SYD7:00 amSydney Kingsford Smith

21h 05m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$880

Air Canada

Oct 13

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD8:20 amSydney Kingsford Smith

Oct 27

SYD10:20 amSydney Kingsford Smith

16h 57m

1 stop

SEA9:17 amSeattle/Tacoma Intl

$898

Air New Zealand flights from Seattle to Sydney

Our best Air New Zealand deals on Seattle to Sydney flight tickets

Air New Zealand

Aug 31

SEA5:50 amSeattle/Tacoma Intl

32h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 6

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,000

Air New Zealand

Sep 8

SEA10:50 amSeattle/Tacoma Intl

27h 30m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 24

SYD9:20 amSydney Kingsford Smith

17h 45m

1 stop

SEA10:05 amSeattle/Tacoma Intl

$1,040

Air New Zealand

Sep 9

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 22

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,078

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/11

3:00 pm-11:40 am

2 stops26h 40m

Sydney Kingsford Smith

Sun 10/18

10:20 am-10:05 am

1 stop17h 45m

$867

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/11

3:00 pm-11:40 am

2 stops26h 40m

Sydney Kingsford Smith

Sun 10/18

7:00 am-10:05 am

2 stops21h 05m

$880

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/18

7:15 pm-8:20 am

1 stop19h 05m

Sydney Kingsford Smith

Wed 10/28

6:20 am-9:17 am

2 stops20h 57m

$911

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 10/31

7:05 pm-1:40 pm

2 stops24h 35m

Sydney Kingsford Smith

Sun 11/8

11:20 am-6:22 pm

1 stop26h 02m

$919

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/18

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 11/30

11:20 am-6:22 pm

1 stop26h 02m

$999

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 11/17

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Mon 11/30

11:20 am-6:22 pm

1 stop26h 02m

$999

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 9/23

5:59 pm-7:05 am

1 stop20h 06m

Sydney Kingsford Smith

Wed 9/30

5:50 pm-10:40 pm

1 stop21h 50m

$1,075

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 9/23

4:59 pm-7:30 am

1 stop21h 31m

Sydney Kingsford Smith

Wed 10/7

10:10 am-12:16 pm

1 stop20h 06m

$1,076

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 12/9

3:30 pm-6:20 am

1 stop19h 50m

Sydney Kingsford Smith

Wed 12/23

11:50 am-12:22 pm

1 stop19h 32m

$1,081

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 9/28

4:35 pm-7:00 am

1 stop21h 25m

Sydney Kingsford Smith

Tue 10/20

10:30 am-11:35 am

1 stop19h 05m

$1,091

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 typical for flights on this route.

Typical prices usually range from $852 to $1,061.
The lowest price recently found on this route was $898.

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 $804. 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 $842.

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 $1,121 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 $955 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of August 2026, prices for Seattle to Sydney flights are approximately 21% 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	$402
Fastest flight time	18h 30m
Direct flights	None

The best one-way flight to Sydney from Seattle in the past 72 hours is $402. The best round-trip flight deal from Seattle to Sydney found on momondo in the last 72 hours is $867.

The fastest flight from Seattle to Sydney takes 18h 30m

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 18h 30m.
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 August 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 (25% of total bookings). The next most popular airlines are United Airlines (15%), ANA (14%), 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 8.3 1,301 reviews	Search ANA flights
Air Canada	PriceFrom $780	Free Cancellation	Rating 7.1 11,542 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,085 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,817 reviews	Search Hawaiian Airlines flights
American Airlines	PriceFrom $827	Free Cancellation	Rating 7.1 12,011 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $827	Free Cancellation	Rating 7.9 12,847 reviews	Search Alaska Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,531 reviews	Search Delta flights
United Airlines	PriceFrom $842	Free Cancellation	Rating 7.4 10,130 reviews	Search United Airlines flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 665 reviews	Search Air New Zealand flights

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Coogee

Cronulla

Leura

Randwick

Manly

Terrigal

Lithgow

Charlestown

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 $402

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 10/16. 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

Our best Air Canada deals on Seattle to Sydney flight tickets

Air New Zealand flights from Seattle to Sydney

Our best Air New Zealand 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.

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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 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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