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

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

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

Los Angeles (LAX) was the most common stop: 58% 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, Delta, and Alaska Airlines 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?

Vancouver (YVR) has the shortest average layover time for this route: 2h 19m.

What airlines fly to Sydney?

Air Canada, ANA and United 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 38% 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 layover airport has the shortest travel time from Seattle to Sydney?

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 18h 39m.

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 September 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.

$484 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

Round-trip

One-way

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7:05 pm - 8:35 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

$905Air Canada

Sun, Oct 25 - Sun, Nov 8

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

$950Air Canada

Sun, Nov 8 - Sun, Nov 15

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

23h 20m1 stop Vancouver Intl

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

22h 12m2 stops Brisbane Vancouver Intl

$972Multiple Airlines

Sun, Oct 25 - Sun, Nov 8

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

23h 20m1 stop Vancouver Intl

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

22h 12m2 stops Brisbane Vancouver Intl

$974Multiple Airlines

Sun, Oct 25 - Sun, Nov 8

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

$1,030Air New Zealand

Tue, Nov 24 - Sun, Dec 6

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

23h 20m1 stop Vancouver Intl

11:20 am - 9:32 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

17h 12m1 stop Vancouver Intl

$1,030Air New Zealand

Mon, Nov 23 - Sun, Dec 6

7:08 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 52m1 stop Los Angeles

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

20h 50m1 stop Los Angeles

$1,043Qantas Airways

Mon, Oct 26 - Mon, Nov 2

6:30 pm - 9:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

19h 35m1 stop Los Angeles

11:50 am - 2:23 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

21h 33m1 stop San Francisco

$1,059United Airlines

Wed, Nov 25 - Mon, Dec 7

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

29h 35m2 stops Denver Intl Los Angeles

11:50 am - 4:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

23h 32m1 stop San Francisco

$1,064United Airlines

Wed, Nov 25 - Mon, Dec 7

3:55 pm - 9:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

22h 05m1 stop Los Angeles

9:00 pm - 10:10 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

20h 10m1 stop Las Vegas Harry Reid Intl

$1,088Qantas Airways

Sat, Dec 12 - Tue, Jan 12

Cheap last minute flights

Enter your travel dates to find the best prices.

7:20 am - 6:50 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

18h 30m1 stop Honolulu

8:45 pm - 6:04 amSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

27h 19m1 stop Honolulu

$1,275Alaska Airlines

Thu, Oct 1 - Sun, Oct 11

11:10 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 50m1 stop Manila Ninoy Aquino Intl

11:15 am - 8:05 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 50m1 stop Manila Ninoy Aquino Intl

$1,285Philippine Airlines

Thu, Oct 1 - Sun, Oct 11

11:10 pm - 8:00 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

39h 50m1 stop Manila Ninoy Aquino Intl

11:15 am - 8:05 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 50m1 stop Manila Ninoy Aquino Intl

$1,287Philippine Airlines

Wed, Sep 30 - Thu, Oct 8

1:24 pm - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

24h 26m2 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

$1,671Delta

Wed, Sep 30 - Sat, Oct 3

11:22 am - 6:50 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

26h 28m2 stops Salt Lake City Los Angeles

9:15 am - 6:55 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

26h 40m2 stops Los Angeles Salt Lake City

$1,671Delta

Tue, Sep 29 - Sat, Oct 3

5:02 pm - 7:05 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

21h 03m1 stop Los Angeles

9:10 am - 10:40 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

30h 30m1 stop Los Angeles

$2,110Qantas Airways

Wed, Sep 30 - Fri, Oct 2

7:55 pm - 10:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

44h 45m2 stops Vancouver Intl Auckland Intl

11:55 am - 4:26 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

22h 31m2 stops Auckland Intl Vancouver Intl

$8,506Air New Zealand

Sat, Oct 3 - Thu, Oct 8

4:30 pm - 7:10 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

33h 40m1 stop Tokyo Haneda

9:45 pm - 2:20 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

34h 35m1 stop Tokyo Haneda

$9,729ANA

Fri, Oct 2 - Tue, Oct 27

4:30 pm - 7:10 pmSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

33h 40m1 stop Tokyo Haneda

9:45 pm - 2:25 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

34h 40m1 stop Tokyo Haneda

$9,979ANA

Fri, Oct 2 - Thu, Oct 22

3:00 pm - 10:40 amSEA Seattle/Tacoma Intl-SYD Sydney Kingsford Smith

25h 40m2 stops Vancouver Intl Auckland Intl

11:50 am - 6:22 pmSYD Sydney Kingsford Smith-SEA Seattle/Tacoma Intl

24h 32m2 stops Auckland Intl Vancouver Intl

$12,477Air New Zealand

Sat, Oct 3 - Mon, Oct 26

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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 18

SEA10:30 pmSeattle/Tacoma Intl

41h 20m

1 stop

SYD9:50 amSydney Kingsford Smith

Apr 21

SYD11:35 amSydney Kingsford Smith

25h 00m

1 stop

SEA7:35 pmSeattle/Tacoma Intl

$1,007

Philippine Airlines

Oct 1

SEA11:10 pmSeattle/Tacoma Intl

39h 50m

1 stop

SYD8:00 amSydney Kingsford Smith

Oct 11

SYD11:15 amSydney Kingsford Smith

26h 50m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,285

Philippine Airlines

Sep 30

SEA11:10 pmSeattle/Tacoma Intl

39h 50m

1 stop

SYD8:00 amSydney Kingsford Smith

Oct 8

SYD11:15 amSydney Kingsford Smith

26h 50m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

$1,287

Air New Zealand flights from Seattle to Sydney

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

Air New Zealand

Nov 23

SEA3:15 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD9:35 amSydney Kingsford Smith

Dec 6

SYD11:20 amSydney Kingsford Smith

17h 12m

1 stop

SEA9:32 amSeattle/Tacoma Intl

$1,030

Air New Zealand

Oct 7

SEA4:35 pmSeattle/Tacoma Intl

21h 25m

1 stop

SYD8:00 amSydney Kingsford Smith

Oct 20

SYD7:50 amSydney Kingsford Smith

28h 54m

2 stops

SEA6:44 pmSeattle/Tacoma Intl

$1,481

Air New Zealand

Oct 7

SEA4:35 pmSeattle/Tacoma Intl

21h 25m

1 stop

SYD8:00 amSydney Kingsford Smith

Oct 20

SYD11:55 amSydney Kingsford Smith

24h 49m

2 stops

SEA6:44 pmSeattle/Tacoma Intl

$1,510

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 10/25

7:05 pm-8:35 am

1 stop19h 30m

Sydney Kingsford Smith

Sun 11/8

11:20 am-2:37 pm

1 stop22h 17m

$905

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 11/8

10:10 am-9:35 am

1 stop28h 25m

Sydney Kingsford Smith

Sun 11/15

11:20 am-2:37 pm

1 stop22h 17m

$950

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/25

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 11/8

6:20 am-9:32 am

2 stops22h 12m

$972

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 10/25

3:15 pm-8:35 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 11/8

6:20 am-9:32 am

2 stops22h 12m

$974

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 11/24

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Sun 12/6

11:20 am-2:37 pm

1 stop22h 17m

$1,030

Quickest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 11/23

3:15 pm-9:35 am

1 stop23h 20m

Sydney Kingsford Smith

Sun 12/6

11:20 am-9:32 am

1 stop17h 12m

$1,030

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 10/26

7:08 pm-9:00 am

1 stop19h 52m

Sydney Kingsford Smith

Mon 11/2

11:10 am-1:00 pm

1 stop20h 50m

$1,043

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/25

6:30 pm-9:05 am

1 stop19h 35m

Sydney Kingsford Smith

Mon 12/7

11:50 am-2:23 pm

1 stop21h 33m

$1,059

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 11/25

8:30 am-9:05 am

2 stops29h 35m

Sydney Kingsford Smith

Mon 12/7

11:50 am-4:22 pm

1 stop23h 32m

$1,064

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 12/12

3:55 pm-9:00 am

1 stop22h 05m

Sydney Kingsford Smith

Tue 1/12

9:00 pm-10:10 pm

1 stop20h 10m

$1,088

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 $938 to $1,186.
The lowest price recently found on this route was $905.

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 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 $1,162 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 $1,010 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of September 2026, prices for Seattle to Sydney flights are approximately 1% 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	$484
Fastest flight time	17h 45m
Direct flights	None

The best one-way flight to Sydney from Seattle in the past 72 hours is $484. The best round-trip flight deal from Seattle to Sydney found on momondo in the last 72 hours is $905.

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 9 as of September 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 (27% of total bookings). The next most popular airlines are ANA (16%), United 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 8.3 1,319 reviews	Search ANA flights
Qantas Airways	PriceFrom $819	Free Cancellation	Rating 7.5 1,102 reviews	Search Qantas Airways flights
Hawaiian Airlines	PriceFrom $822	Free Cancellation	Rating 7.8 2,809 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $845	Free Cancellation	Rating 7.4 10,246 reviews	Search United Airlines flights
Delta	PriceFrom $845	Free Cancellation	Rating 7.8 8,604 reviews	Search Delta flights
Alaska Airlines	PriceFrom $862	Free Cancellation	Rating 7.9 12,985 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $901	Free Cancellation	Rating 7.1 11,702 reviews	Search Air Canada flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 670 reviews	Search Air New Zealand flights
American Airlines	PriceFrom $975	Free Cancellation	Rating 7.0 12,097 reviews	Search American Airlines flights

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Manly

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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 $484

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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Philippine Airlines flights from Seattle to Sydney

Our best Philippine Airlines 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

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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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