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 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.

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

Air Canada is the most popular carrier operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

What airlines fly to Sydney?

Air Canada, United Airlines and Delta 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 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 18m.

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 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.

$479 Cheap Flights from Seattle to Sydney in 2026

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4:31 pm - 8:05 am

SEA

SYD

21h 34m

1 stop

10:20 am - 2:46 pm

SYD

SEA

21h 26m

1 stop

$901United Airlines

Sun, Mar 22 - Tue, Apr 7

10:00 am - 7:05 am

SEA

SYD

28h 05m

1 stop

5:50 pm - 10:58 pm

SYD

SEA

22h 08m

1 stop

$903American Airlines

Tue, Apr 7 - Tue, Apr 21

12:55 pm - 8:05 am

SEA

SYD

25h 10m

2 stops

10:20 am - 2:46 pm

SYD

SEA

21h 26m

1 stop

$905United Airlines

Mon, Mar 23 - Wed, Apr 8

10:29 am - 6:55 am

SEA

SYD

27h 26m

1 stop

9:30 am - 5:59 pm

SYD

SEA

25h 29m

2 stops

$906United Airlines

Mon, Jun 1 - Mon, Jun 29

2:57 pm - 7:05 am

SEA

SYD

23h 08m

2 stops

5:50 pm - 10:58 pm

SYD

SEA

22h 08m

1 stop

$907American Airlines

Tue, Apr 7 - Tue, Apr 21

4:32 pm - 7:00 am

SEA

SYD

21h 28m

1 stop

9:30 am - 9:10 pm

SYD

SEA

28h 40m

2 stops

$909United Airlines

Mon, May 11 - Sun, May 24

8:45 am - 6:55 am

SEA

SYD

29h 10m

1 stop

9:30 am - 9:10 pm

SYD

SEA

28h 40m

2 stops

$913United Airlines

Wed, Jun 17 - Tue, Jun 30

9:25 am - 6:50 am

SEA

SYD

28h 25m

2 stops

9:15 am - 10:55 am

SYD

SEA

18h 40m

1 stop

$918Delta

Sun, May 10 - Tue, May 26

9:25 pm - 6:50 am

SEA

SYD

40h 25m

1 stop

9:15 am - 12:58 pm

SYD

SEA

20h 43m

1 stop

$921Delta

Sat, Jun 20 - Tue, Jul 7

5:59 pm - 11:50 am

SEA

SYD

24h 51m

2 stops

1:15 pm - 8:42 pm

SYD

SEA

24h 27m

2 stops

$922Multiple Airlines

Tue, Apr 7 - Tue, Apr 14

Delta flights from Seattle to Sydney

Our best Delta deals on Seattle to Sydney flight tickets

Delta

May 10

SEA9:25 amSeattle/Tacoma Intl

28h 25m

2 stops

SYD6:50 amSydney Kingsford Smith

May 26

SYD9:15 amSydney Kingsford Smith

18h 40m

1 stop

SEA10:55 amSeattle/Tacoma Intl

$918

Delta

Jun 20

SEA9:25 pmSeattle/Tacoma Intl

40h 25m

1 stop

SYD6:50 amSydney Kingsford Smith

Jul 7

SYD9:15 amSydney Kingsford Smith

20h 43m

1 stop

SEA12:58 pmSeattle/Tacoma Intl

$921

Delta

May 9

SEA9:20 pmSeattle/Tacoma Intl

40h 30m

1 stop

SYD6:50 amSydney Kingsford Smith

May 27

SYD9:15 amSydney Kingsford Smith

23h 08m

2 stops

SEA3:23 pmSeattle/Tacoma Intl

$925

ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets

ANA

Jun 23

SEA5:04 pmSeattle/Tacoma Intl

33h 11m

2 stops

SYD7:15 pmSydney Kingsford Smith

Jul 5

SYD8:55 pmSydney Kingsford Smith

34h 30m

1 stop

SEA2:25 pmSeattle/Tacoma Intl

$931

ANA

Mar 1

SEA3:40 pmSeattle/Tacoma Intl

30h 00m

2 stops

SYD4:40 pmSydney Kingsford Smith

May 27

SYD6:00 amSydney Kingsford Smith

25h 20m

2 stops

SEA2:20 pmSeattle/Tacoma Intl

$1,060

Fly from

Fly to

Route

Depart

Return

Price

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 3/22

4:31 pm-8:05 am

1 stop21h 34m

Sydney Kingsford Smith

Tue 4/7

10:20 am-2:46 pm

1 stop21h 26m

$901

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/7

10:00 am-7:05 am

1 stop28h 05m

Sydney Kingsford Smith

Tue 4/21

5:50 pm-10:58 pm

1 stop22h 08m

$903

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 3/23

12:55 pm-8:05 am

2 stops25h 10m

Sydney Kingsford Smith

Wed 4/8

10:20 am-2:46 pm

1 stop21h 26m

$905

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

10:29 am-6:55 am

1 stop27h 26m

Sydney Kingsford Smith

Mon 6/29

9:30 am-5:59 pm

2 stops25h 29m

$906

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/7

2:57 pm-7:05 am

2 stops23h 08m

Sydney Kingsford Smith

Tue 4/21

5:50 pm-10:58 pm

1 stop22h 08m

$907

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 5/11

4:32 pm-7:00 am

1 stop21h 28m

Sydney Kingsford Smith

Sun 5/24

9:30 am-9:10 pm

2 stops28h 40m

$909

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 6/17

8:45 am-6:55 am

1 stop29h 10m

Sydney Kingsford Smith

Tue 6/30

9:30 am-9:10 pm

2 stops28h 40m

$913

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 5/10

9:25 am-6:50 am

2 stops28h 25m

Sydney Kingsford Smith

Tue 5/26

9:15 am-10:55 am

1 stop18h 40m

$918

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 6/20

9:25 pm-6:50 am

1 stop40h 25m

Sydney Kingsford Smith

Tue 7/7

9:15 am-12:58 pm

1 stop20h 43m

$921

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 4/7

5:59 pm-11:50 am

2 stops24h 51m

Sydney Kingsford Smith

Tue 4/14

1:15 pm-8:42 pm

2 stops24h 27m

$922

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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 $845. 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 $848.

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 $1,066 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 10m
Direct flights	None

The fastest flight from Seattle to Sydney takes 20h 10m

There are no direct flights from Seattle to Sydney. There are no popular flight routes from Seattle to Sydney.

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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 10m.
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 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 (28% of total bookings). The next most popular airlines are United Airlines (23%), Delta (12%), and Qantas Airways (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 1,098 reviews	Search ANA flights
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 8.0 11,937 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 10,739 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $786	Free Cancellation	Rating 7.5 997 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.2 11,339 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,835 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $819	Free Cancellation	Rating 7.4 9,342 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,236 reviews	Search Delta flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	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 $494

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 3/4. 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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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?

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

Find info about flight duration, direct flights, and airports for your flight from Seattle to Sydney

Fastest flight time

Direct flights

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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