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 44m.

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

Los Angeles (LAX) was the most common stop: 48% 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 Los Angeles (LAX) have the shortest average one-way travel time: 19h 58m.

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 39% 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.

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

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

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 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.

$520 Cheap Flights from Seattle to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Sydney

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:06 am - 6:25 am

SEA

SYD

24h 19m

1 stop

2:00 pm - 6:26 pm

SYD

SEA

23h 26m

2 stops

$921Multiple Airlines

Thu, Nov 5 - Wed, Nov 18

11:06 am - 6:25 am

SEA

SYD

24h 19m

1 stop

2:00 pm - 6:26 pm

SYD

SEA

23h 26m

2 stops

$936Multiple Airlines

Tue, Nov 3 - Tue, Nov 10

7:05 pm - 9:35 am

SEA

SYD

19h 30m

1 stop

11:20 am - 9:27 am

SYD

SEA

17h 07m

1 stop

$1,030Air Canada

Sun, Nov 15 - Sun, Nov 22

4:59 pm - 7:30 am

SEA

SYD

21h 31m

1 stop

5:50 pm - 7:39 pm

SYD

SEA

18h 49m

1 stop

$1,033Qantas Airways

Wed, Sep 9 - Wed, Sep 16

11:40 am - 7:05 am

SEA

SYD

26h 25m

1 stop

12:00 pm - 4:41 pm

SYD

SEA

21h 41m

1 stop

$1,035American Airlines

Wed, Aug 19 - Wed, Aug 26

11:40 am - 7:05 am

SEA

SYD

26h 25m

1 stop

12:00 pm - 4:41 pm

SYD

SEA

21h 41m

1 stop

$1,036American Airlines

Wed, Aug 19 - Wed, Aug 26

10:55 am - 6:55 am

SEA

SYD

27h 00m

1 stop

9:30 am - 7:14 pm

SYD

SEA

26h 44m

1 stop

$1,038United Airlines

Sun, Aug 30 - Sun, Sep 6

9:05 am - 6:55 am

SEA

SYD

28h 50m

1 stop

11:20 am - 12:18 pm

SYD

SEA

18h 58m

1 stop

$1,039United Airlines

Tue, Aug 18 - Mon, Oct 19

5:02 pm - 7:30 am

SEA

SYD

21h 28m

1 stop

5:50 pm - 7:39 pm

SYD

SEA

18h 49m

1 stop

$1,039Qantas Airways

Wed, Sep 9 - Wed, Sep 16

10:50 am - 7:20 am

SEA

SYD

27h 30m

1 stop

9:20 am - 10:05 am

SYD

SEA

17h 45m

1 stop

$1,044Air Canada

Wed, Sep 9 - Wed, Sep 16

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Delta flights from Seattle to Sydney

Our best Delta deals on Seattle to Sydney flight tickets

Delta

Aug 2

SEA9:30 amSeattle/Tacoma Intl

28h 20m

2 stops

SYD6:50 amSydney Kingsford Smith

Aug 19

SYD9:15 amSydney Kingsford Smith

24h 39m

2 stops

SEA4:54 pmSeattle/Tacoma Intl

$1,044

Delta

Aug 2

SEA7:15 amSeattle/Tacoma Intl

30h 35m

1 stop

SYD6:50 amSydney Kingsford Smith

Aug 19

SYD9:15 amSydney Kingsford Smith

24h 22m

1 stop

SEA4:37 pmSeattle/Tacoma Intl

$1,045

Delta

Aug 9

SEA2:50 pmSeattle/Tacoma Intl

23h 00m

1 stop

SYD6:50 amSydney Kingsford Smith

Aug 25

SYD9:15 amSydney Kingsford Smith

44h 12m

1 stop

SEA12:27 pmSeattle/Tacoma Intl

$1,046

United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

United Airlines

Aug 9

SEA2:34 pmSeattle/Tacoma Intl

23h 26m

2 stops

SYD7:00 amSydney Kingsford Smith

Aug 23

SYD10:20 amSydney Kingsford Smith

19h 00m

1 stop

SEA12:20 pmSeattle/Tacoma Intl

$1,037

United Airlines

Aug 2

SEA5:04 pmSeattle/Tacoma Intl

20h 56m

1 stop

SYD7:00 amSydney Kingsford Smith

Aug 19

SYD10:20 amSydney Kingsford Smith

22h 54m

1 stop

SEA4:14 pmSeattle/Tacoma Intl

$1,038

United Airlines

Aug 9

SEA8:45 amSeattle/Tacoma Intl

29h 10m

1 stop

SYD6:55 amSydney Kingsford Smith

Oct 19

SYD11:20 amSydney Kingsford Smith

25h 24m

1 stop

SEA6:44 pmSeattle/Tacoma Intl

$1,039

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 11/5

11:06 am-6:25 am

1 stop24h 19m

Sydney Kingsford Smith

Wed 11/18

2:00 pm-6:26 pm

2 stops23h 26m

$921

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 11/3

11:06 am-6:25 am

1 stop24h 19m

Sydney Kingsford Smith

Tue 11/10

2:00 pm-6:26 pm

2 stops23h 26m

$936

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 11/15

7:05 pm-9:35 am

1 stop19h 30m

Sydney Kingsford Smith

Sun 11/22

11:20 am-9:27 am

1 stop17h 07m

$1,030

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 9/9

4:59 pm-7:30 am

1 stop21h 31m

Sydney Kingsford Smith

Wed 9/16

5:50 pm-7:39 pm

1 stop18h 49m

$1,033

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 8/19

11:40 am-7:05 am

1 stop26h 25m

Sydney Kingsford Smith

Wed 8/26

12:00 pm-4:41 pm

1 stop21h 41m

$1,035

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 8/19

11:40 am-7:05 am

1 stop26h 25m

Sydney Kingsford Smith

Wed 8/26

12:00 pm-4:41 pm

1 stop21h 41m

$1,036

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/30

10:55 am-6:55 am

1 stop27h 00m

Sydney Kingsford Smith

Sun 9/6

9:30 am-7:14 pm

1 stop26h 44m

$1,038

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 8/18

9:05 am-6:55 am

1 stop28h 50m

Sydney Kingsford Smith

Mon 10/19

11:20 am-12:18 pm

1 stop18h 58m

$1,039

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 9/9

5:02 pm-7:30 am

1 stop21h 28m

Sydney Kingsford Smith

Wed 9/16

5:50 pm-7:39 pm

1 stop18h 49m

$1,039

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 9/9

10:50 am-7:20 am

1 stop27h 30m

Sydney Kingsford Smith

Wed 9/16

9:20 am-10:05 am

1 stop17h 45m

$1,044

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 $615 to $1,126.
The lowest price recently found on this route was $921.

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 $735. 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 $1,095 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 $928 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of August 2026, prices for Seattle to Sydney flights are approximately 27% 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 05m
Direct flights	None

The fastest flight from Seattle to Sydney takes 19h 05m

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

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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 19h 05m.
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 (26% 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 1,289 reviews	Search ANA flights
Air Canada	PriceFrom $778	Free Cancellation	Rating 7.1 11,419 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $803	Free Cancellation	Rating 7.5 1,074 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,845 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $812	Free Cancellation	Rating 7.8 2,819 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $827	Free Cancellation	Rating 7.9 12,749 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $841	Free Cancellation	Rating 7.4 10,061 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,493 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 657 reviews	Search Air New Zealand flights

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Penrith

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Leura

Cronulla

Randwick

Manly

Lithgow

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Terrigal

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 $520

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 11/26. 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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Delta flights from Seattle to Sydney

Our best Delta deals on Seattle to Sydney flight tickets

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 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

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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