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 53m.

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.

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 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 Vancouver (YVR) have the shortest average one-way travel time: 20h 22m.

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 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.

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 July 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.

$495 Cheap Flights from Seattle to Sydney in 2026

Q: 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 $1,060 to $1,545. The lowest price recently found on this route was $972.

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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.

4:30 pm - 9:25 am

SEA

SYD

23h 55m

1 stop

11:45 am - 6:32 pm

SYD

SEA

23h 47m

2 stops

$972ANA

Sun, Aug 2 - Wed, Aug 19

4:30 pm - 7:10 pm

SEA

SYD

33h 40m

1 stop

8:55 pm - 6:32 pm

SYD

SEA

38h 37m

2 stops

$973ANA

Tue, Jul 28 - Tue, Aug 11

8:45 am - 6:55 am

SEA

SYD

29h 10m

1 stop

10:20 am - 11:26 pm

SYD

SEA

30h 06m

1 stop

$976United Airlines

Mon, Aug 3 - Sun, Aug 16

4:30 pm - 7:10 pm

SEA

SYD

33h 40m

1 stop

8:55 pm - 2:25 pm

SYD

SEA

34h 30m

1 stop

$977ANA

Mon, Jul 27 - Sun, Aug 9

3:21 pm - 6:55 am

SEA

SYD

22h 34m

1 stop

9:10 am - 4:32 pm

SYD

SEA

24h 22m

1 stop

$978American Airlines

Mon, Aug 3 - Sun, Aug 16

6:57 pm - 6:55 am

SEA

SYD

18h 58m

1 stop

10:20 am - 12:20 pm

SYD

SEA

19h 00m

1 stop

$979United Airlines

Mon, Aug 3 - Sun, Aug 16

8:45 am - 6:55 am

SEA

SYD

29h 10m

1 stop

9:30 am - 9:15 pm

SYD

SEA

28h 45m

2 stops

$980United Airlines

Mon, Aug 3 - Sun, Aug 16

5:04 pm - 7:00 am

SEA

SYD

20h 56m

1 stop

9:30 am - 9:15 pm

SYD

SEA

28h 45m

2 stops

$982United Airlines

Mon, Aug 3 - Sun, Aug 16

2:20 pm - 7:30 am

SEA

SYD

24h 10m

1 stop

9:10 am - 4:32 pm

SYD

SEA

24h 22m

1 stop

$985American Airlines

Mon, Aug 3 - Sun, Aug 16

2:20 pm - 7:30 am

SEA

SYD

24h 10m

1 stop

9:10 am - 4:32 pm

SYD

SEA

24h 22m

1 stop

$987American Airlines

Mon, Aug 3 - Sun, Aug 16

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Air Canada flights from Seattle to Sydney

Our best Air Canada deals on Seattle to Sydney flight tickets

Air Canada

Jul 26

SEA5:45 amSeattle/Tacoma Intl

32h 35m

1 stop

SYD7:20 amSydney Kingsford Smith

Aug 5

SYD9:20 amSydney Kingsford Smith

26h 12m

1 stop

SEA6:32 pmSeattle/Tacoma Intl

$1,054

Air Canada

Jul 26

SEA3:00 pmSeattle/Tacoma Intl

23h 20m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 14

SYD9:20 amSydney Kingsford Smith

17h 47m

1 stop

SEA10:07 amSeattle/Tacoma Intl

$1,055

Air Canada

Nov 11

SEA8:40 amSeattle/Tacoma Intl

29h 55m

1 stop

SYD9:35 amSydney Kingsford Smith

Nov 30

SYD8:30 amSydney Kingsford Smith

28h 52m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

$1,070

United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

United Airlines

Aug 3

SEA8:45 amSeattle/Tacoma Intl

29h 10m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 16

SYD10:20 amSydney Kingsford Smith

30h 06m

1 stop

SEA11:26 pmSeattle/Tacoma Intl

$976

United Airlines

Aug 3

SEA6:57 pmSeattle/Tacoma Intl

18h 58m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 16

SYD10:20 amSydney Kingsford Smith

19h 00m

1 stop

SEA12:20 pmSeattle/Tacoma Intl

$979

United Airlines

Aug 3

SEA6:57 pmSeattle/Tacoma Intl

18h 58m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 16

SYD10:20 amSydney Kingsford Smith

19h 00m

1 stop

SEA12:20 pmSeattle/Tacoma Intl

$980

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/2

4:30 pm-9:25 am

1 stop23h 55m

Sydney Kingsford Smith

Wed 8/19

11:45 am-6:32 pm

2 stops23h 47m

$972

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

4:30 pm-7:10 pm

1 stop33h 40m

Sydney Kingsford Smith

Tue 8/11

8:55 pm-6:32 pm

2 stops38h 37m

$973

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

8:45 am-6:55 am

1 stop29h 10m

Sydney Kingsford Smith

Sun 8/16

10:20 am-11:26 pm

1 stop30h 06m

$976

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 7/27

4:30 pm-7:10 pm

1 stop33h 40m

Sydney Kingsford Smith

Sun 8/9

8:55 pm-2:25 pm

1 stop34h 30m

$977

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

3:21 pm-6:55 am

1 stop22h 34m

Sydney Kingsford Smith

Sun 8/16

9:10 am-4:32 pm

1 stop24h 22m

$978

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

6:57 pm-6:55 am

1 stop18h 58m

Sydney Kingsford Smith

Sun 8/16

10:20 am-12:20 pm

1 stop19h 00m

$979

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

8:45 am-6:55 am

1 stop29h 10m

Sydney Kingsford Smith

Sun 8/16

9:30 am-9:15 pm

2 stops28h 45m

$980

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

5:04 pm-7:00 am

1 stop20h 56m

Sydney Kingsford Smith

Sun 8/16

9:30 am-9:15 pm

2 stops28h 45m

$982

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

2:20 pm-7:30 am

1 stop24h 10m

Sydney Kingsford Smith

Sun 8/16

9:10 am-4:32 pm

1 stop24h 22m

$985

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 8/3

2:20 pm-7:30 am

1 stop24h 10m

Sydney Kingsford Smith

Sun 8/16

9:10 am-4:32 pm

1 stop24h 22m

$987

Flights are sorted by cheapest round-trip flights first.

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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 typical price of a round-trip flight between Seattle and Sydney?

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 $672. 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 $1,083 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 $936 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of July 2026, prices for Seattle to Sydney flights are approximately 26% 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	17h 45m
Direct flights	None

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.

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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 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 July 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 United Airlines (16%), ANA (13%), 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 1,271 reviews	Search ANA flights
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 7.9 12,654 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $779	Free Cancellation	Rating 7.1 11,332 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 1,061 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,809 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,824 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $831	Free Cancellation	Rating 7.4 9,979 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.8 8,458 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 653 reviews	Search Air New Zealand flights

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Cronulla

Leura

Randwick

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Manly

Terrigal

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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 $495

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 8/9. 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

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United Airlines flights from Seattle to Sydney

Our best United Airlines deals on Seattle to Sydney flight tickets

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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

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

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.

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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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