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 09m.

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 31% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 10 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?

United Airlines and Air New Zealand are the most popular carriers operating from Seattle/Tacoma Intl to Sydney Kingsford Smith

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

Los Angeles (LAX) was the most common stop: 49% of momondo users choosing 1-stop flights on this route connected there.

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 21m.

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 10 as of May 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.

$489 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 $1,231 to $976. The lowest price recently found on this route was $1,052.

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Find the cheapest flights from Seattle to Sydney

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One-way

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6:14 pm - 7:30 am

SEA

SYD

20h 16m

1 stop

9:10 am - 11:52 am

SYD

SEA

19h 42m

1 stop

$1,052Multiple Airlines

Mon, Jun 1 - Mon, Jun 29

5:31 pm - 7:05 am

SEA

SYD

20h 34m

1 stop

9:10 am - 12:01 pm

SYD

SEA

19h 51m

1 stop

$1,055Multiple Airlines

Sat, May 23 - Fri, Jun 5

5:10 pm - 7:05 am

SEA

SYD

20h 55m

1 stop

5:50 pm - 8:56 pm

SYD

SEA

20h 06m

1 stop

$1,060Multiple Airlines

Tue, Jul 28 - Tue, Aug 11

2:20 pm - 7:05 am

SEA

SYD

23h 45m

1 stop

5:50 pm - 7:42 pm

SYD

SEA

18h 52m

1 stop

$1,065Qantas Airways

Thu, Jul 30 - Tue, Aug 25

2:20 pm - 7:05 am

SEA

SYD

23h 45m

1 stop

5:50 pm - 8:56 pm

SYD

SEA

20h 06m

1 stop

$1,069Qantas Airways

Sat, Aug 1 - Fri, Aug 14

5:04 pm - 7:05 am

SEA

SYD

21h 01m

1 stop

9:10 am - 8:56 pm

SYD

SEA

28h 46m

1 stop

$1,081Qantas Airways

Sun, Jun 14 - Tue, Jun 30

6:14 pm - 7:05 am

SEA

SYD

19h 51m

1 stop

9:10 am - 9:45 pm

SYD

SEA

29h 35m

1 stop

$1,084Qantas Airways

Mon, Jun 1 - Fri, Jun 12

8:30 am - 7:00 am

SEA

SYD

29h 30m

1 stop

9:30 am - 11:33 am

SYD

SEA

19h 03m

1 stop

$1,092United Airlines

Wed, Jul 22 - Mon, Aug 24

4:59 pm - 11:50 am

SEA

SYD

25h 51m

2 stops

6:00 am - 8:42 pm

SYD

SEA

31h 42m

2 stops

$1,093Multiple Airlines

Sun, Aug 30 - Sun, Sep 13

5:10 pm - 11:50 am

SEA

SYD

25h 40m

2 stops

1:15 pm - 7:02 pm

SYD

SEA

22h 47m

2 stops

$1,094Multiple Airlines

Tue, Aug 4 - Fri, Aug 21

ANA flights from Seattle to Sydney

Our best ANA deals on Seattle to Sydney flight tickets

ANA

May 11

SEA4:30 pmSeattle/Tacoma Intl

33h 40m

1 stop

SYD7:10 pmSydney Kingsford Smith

May 19

SYD8:55 pmSydney Kingsford Smith

34h 30m

1 stop

SEA2:25 pmSeattle/Tacoma Intl

$1,071

ANA

May 11

SEA4:30 pmSeattle/Tacoma Intl

33h 40m

1 stop

SYD7:10 pmSydney Kingsford Smith

Jun 15

SYD11:45 amSydney Kingsford Smith

23h 45m

2 stops

SEA6:30 pmSeattle/Tacoma Intl

$1,081

ANA

May 10

SEA4:30 pmSeattle/Tacoma Intl

33h 40m

1 stop

SYD7:10 pmSydney Kingsford Smith

Jun 14

SYD8:55 pmSydney Kingsford Smith

38h 35m

2 stops

SEA6:30 pmSeattle/Tacoma Intl

$1,092

Delta flights from Seattle to Sydney

Our best Delta deals on Seattle to Sydney flight tickets

Delta

May 9

SEA9:20 pmSeattle/Tacoma Intl

40h 30m

1 stop

SYD6:50 amSydney Kingsford Smith

May 24

SYD9:15 amSydney Kingsford Smith

20h 08m

1 stop

SEA12:23 pmSeattle/Tacoma Intl

$1,108

Delta

May 9

SEA9:20 pmSeattle/Tacoma Intl

40h 30m

1 stop

SYD6:50 amSydney Kingsford Smith

May 25

SYD9:15 amSydney Kingsford Smith

23h 08m

2 stops

SEA3:23 pmSeattle/Tacoma Intl

$1,112

Delta

May 17

SEA12:40 pmSeattle/Tacoma Intl

25h 10m

1 stop

SYD6:50 amSydney Kingsford Smith

Jun 14

SYD9:15 amSydney Kingsford Smith

44h 37m

2 stops

SEA12:52 pmSeattle/Tacoma Intl

$1,118

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

6:14 pm-7:30 am

1 stop20h 16m

Sydney Kingsford Smith

Mon 6/29

9:10 am-11:52 am

1 stop19h 42m

$1,052

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 5/23

5:31 pm-7:05 am

1 stop20h 34m

Sydney Kingsford Smith

Fri 6/5

9:10 am-12:01 pm

1 stop19h 51m

$1,055

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 7/28

5:10 pm-7:05 am

1 stop20h 55m

Sydney Kingsford Smith

Tue 8/11

5:50 pm-8:56 pm

1 stop20h 06m

$1,060

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Thu 7/30

2:20 pm-7:05 am

1 stop23h 45m

Sydney Kingsford Smith

Tue 8/25

5:50 pm-7:42 pm

1 stop18h 52m

$1,065

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sat 8/1

2:20 pm-7:05 am

1 stop23h 45m

Sydney Kingsford Smith

Fri 8/14

5:50 pm-8:56 pm

1 stop20h 06m

$1,069

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 6/14

5:04 pm-7:05 am

1 stop21h 01m

Sydney Kingsford Smith

Tue 6/30

9:10 am-8:56 pm

1 stop28h 46m

$1,081

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Mon 6/1

6:14 pm-7:05 am

1 stop19h 51m

Sydney Kingsford Smith

Fri 6/12

9:10 am-9:45 pm

1 stop29h 35m

$1,084

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Wed 7/22

8:30 am-7:00 am

1 stop29h 30m

Sydney Kingsford Smith

Mon 8/24

9:30 am-11:33 am

1 stop19h 03m

$1,092

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Sun 8/30

4:59 pm-11:50 am

2 stops25h 51m

Sydney Kingsford Smith

Sun 9/13

6:00 am-8:42 pm

2 stops31h 42m

$1,093

SeattleSydney

SEA - SYD

SEASYD

Seattle/Tacoma Intl

Tue 8/4

5:10 pm-11:50 am

2 stops25h 40m

Sydney Kingsford Smith

Fri 8/21

1:15 pm-7:02 pm

2 stops22h 47m

$1,094

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?

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 $818. 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 $844.

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 $1,068 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 $900 on momondo.

How have Seattle to Sydney flight prices changed over time?

As of May 2026, prices for Seattle to Sydney flights are approximately 12% 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 50m
Direct flights	None

The fastest flight from Seattle to Sydney takes 17h 50m

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 50m.
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 10 as of May 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 (20% of total bookings). The next most popular airlines are United Airlines (17%), Alaska Airlines (15%), and Qantas Airways (13%).

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 1,205 reviews	Search ANA flights
Alaska Airlines	PriceFrom $591	Free Cancellation	Rating 7.9 12,324 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $778	Free Cancellation	Rating 7.1 10,995 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $789	Free Cancellation	Rating 7.5 1,030 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $804	Free Cancellation	Rating 7.1 11,673 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $813	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
United Airlines	PriceFrom $833	Free Cancellation	Rating 7.4 9,680 reviews	Search United Airlines flights
Delta	PriceFrom $842	Free Cancellation	Rating 7.9 8,461 reviews	Search Delta flights
Air New Zealand	PriceFrom $947	Free Cancellation	Rating 8.0 639 reviews	Search Air New Zealand flights
Alaska Airlines	PriceFrom $1,126	Free Cancellation	Rating 0.0	Search Alaska Airlines flights

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Coogee

Lithgow

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Cronulla

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 $472

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 8/12. 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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ANA 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

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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