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: 20h 01m.

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?

Air Canada, United Airlines and Alaska 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 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: 40% 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.

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 February 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

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5:59 pm - 11:50 am

SEA

SYD

24h 51m

2 stops

1:20 pm - 8:22 pm

SYD

SEA

24h 02m

2 stops

$883Multiple Airlines

Tue, Apr 21 - Wed, May 13

5:50 pm - 10:05 pm

SEA

SYD

34h 15m

2 stops

6:00 am - 8:58 pm

SYD

SEA

32h 58m

2 stops

$884Multiple Airlines

Tue, Mar 10 - Tue, Mar 17

10:42 am - 7:30 am

SEA

SYD

27h 48m

1 stop

6:00 am - 11:05 pm

SYD

SEA

34h 05m

2 stops

$922Multiple Airlines

Tue, Apr 21 - Wed, May 13

10:42 am - 7:30 am

SEA

SYD

27h 48m

1 stop

1:15 pm - 6:55 pm

SYD

SEA

22h 40m

2 stops

$925Multiple Airlines

Sat, May 2 - Sat, May 16

10:42 am - 7:30 am

SEA

SYD

27h 48m

1 stop

1:10 pm - 7:46 pm

SYD

SEA

23h 36m

2 stops

$927Multiple Airlines

Sat, May 2 - Wed, May 6

10:42 am - 7:30 am

SEA

SYD

27h 48m

1 stop

1:15 pm - 7:53 pm

SYD

SEA

23h 38m

2 stops

$931Multiple Airlines

Tue, May 5 - Tue, May 12

3:50 pm - 7:25 am

SEA

SYD

21h 35m

1 stop

2:00 pm - 6:57 pm

SYD

SEA

22h 57m

2 stops

$933Multiple Airlines

Tue, Mar 10 - Tue, Mar 17

11:32 am - 7:25 am

SEA

SYD

24h 53m

1 stop

2:00 pm - 8:47 am

SYD

SEA

36h 47m

2 stops

$934Multiple Airlines

Sat, Feb 28 - Sun, Mar 15

3:50 pm - 7:25 am

SEA

SYD

21h 35m

1 stop

2:00 pm - 10:42 pm

SYD

SEA

26h 42m

2 stops

$935Multiple Airlines

Wed, Mar 11 - Wed, Mar 18

10:42 am - 7:30 am

SEA

SYD

27h 48m

1 stop

1:15 pm - 7:53 pm

SYD

SEA

23h 38m

2 stops

$938Multiple Airlines

Fri, Apr 17 - Fri, May 1

United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

United Airlines

Feb 17

SEA7:00 amSeattle/Tacoma Intl

29h 00m

2 stops

SYD7:00 amSydney Kingsford Smith

Mar 10

SYD11:05 amSydney Kingsford Smith

19h 19m

1 stop

SEA12:24 pmSeattle/Tacoma Intl

$1,179

United Airlines

Feb 10

SEA5:10 pmSeattle/Tacoma Intl

21h 05m

1 stop

SYD9:15 amSydney Kingsford Smith

Feb 17

SYD11:50 amSydney Kingsford Smith

25h 13m

2 stops

SEA6:03 pmSeattle/Tacoma Intl

$1,180

United Airlines

Feb 17

SEA12:55 pmSeattle/Tacoma Intl

25h 10m

2 stops

SYD9:05 amSydney Kingsford Smith

Mar 10

SYD2:00 pmSydney Kingsford Smith

25h 14m

2 stops

SEA9:14 pmSeattle/Tacoma Intl

$1,184

Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

Feb 17

SEA3:40 pmSeattle/Tacoma Intl

22h 55m

1 stop

SYD9:35 amSydney Kingsford Smith

Mar 10

SYD10:20 amSydney Kingsford Smith

17h 11m

1 stop

SEA9:31 amSeattle/Tacoma Intl

$1,023

Air Canada

Feb 22

SEA3:40 pmSeattle/Tacoma Intl

22h 55m

1 stop

SYD9:35 amSydney Kingsford Smith

Mar 22

SYD10:20 amSydney Kingsford Smith

22h 41m

1 stop

SEA3:01 pmSeattle/Tacoma Intl

$1,111

Air Canada

Feb 22

SEA8:00 pmSeattle/Tacoma Intl

18h 35m

1 stop

SYD9:35 amSydney Kingsford Smith

Mar 22

SYD8:00 amSydney Kingsford Smith

25h 01m

2 stops

SEA3:01 pmSeattle/Tacoma Intl

$1,126

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/21

5:59 pm-11:50 am

2 stops24h 51m

Sydney Kingsford Smith

Wed 5/13

1:20 pm-8:22 pm

2 stops24h 02m

$883

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 3/10

5:50 pm-10:05 pm

2 stops34h 15m

Sydney Kingsford Smith

Tue 3/17

6:00 am-8:58 pm

2 stops32h 58m

$884

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/21

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Wed 5/13

6:00 am-11:05 pm

2 stops34h 05m

$922

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/2

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Sat 5/16

1:15 pm-6:55 pm

2 stops22h 40m

$925

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/2

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Wed 5/6

1:10 pm-7:46 pm

2 stops23h 36m

$927

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 5/5

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Tue 5/12

1:15 pm-7:53 pm

2 stops23h 38m

$931

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 3/10

3:50 pm-7:25 am

1 stop21h 35m

Sydney Kingsford Smith

Tue 3/17

2:00 pm-6:57 pm

2 stops22h 57m

$933

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 2/28

11:32 am-7:25 am

1 stop24h 53m

Sydney Kingsford Smith

Sun 3/15

2:00 pm-8:47 am

2 stops36h 47m

$934

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 3/11

3:50 pm-7:25 am

1 stop21h 35m

Sydney Kingsford Smith

Wed 3/18

2:00 pm-10:42 pm

2 stops26h 42m

$935

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Fri 4/17

10:42 am-7:30 am

1 stop27h 48m

Sydney Kingsford Smith

Fri 5/1

1:15 pm-7:53 pm

2 stops23h 38m

$938

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 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 $860.

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 $1,056 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 $876 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of February 2026, prices for Seattle to Sydney flights are approximately 29% 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	20h 07m
Direct flights	None

The fastest flight from Seattle to Sydney takes 20h 07m

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 20h 07m.
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 February 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 (23% of total bookings). The next most popular airlines are United Airlines (23%), Alaska Airlines (16%), and Delta (11%).

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 1,089 reviews	Search ANA flights
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 8.0 11,861 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,698 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $786	Free Cancellation	Rating 7.5 988 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,257 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,830 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $821	Free Cancellation	Rating 7.4 9,259 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,175 reviews	Search Delta flights

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Manly

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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 $414

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 3/5. 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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United Airlines flights from Seattle to Sydney

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How to get the cheapest flight ticket from Seattle to 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 February 2026, prices for Seattle to Sydney flights are approximately 29% cheaper when compared to flights at the same time last year.

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: 40% 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: 20h 01m.

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.

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List of cabin classes available on flights landing in Sydney. Availability may vary depending on flight origin and airline.

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