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Cheap flights from Seattle to Sydney from $685

SEA — SYD
12 Oct — 19 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Sydney

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Sydney

Tue 20/1015:00 -
1 stop23h 20m
Tue 27/1010:20 -
1 stop22h 17m
Deal found 8/9$1,183
Sat 7/1120:09 -
1 stop39h 16m
Tue 10/1114:00 -
2 stops23h 54m
Deal found 7/9$1,199
Sun 18/1010:50 -
1 stop27h 30m
Sun 1/1111:20 -
1 stop26h 02m
Deal found 9/9$1,233
Sun 18/1019:15 -
1 stop19h 05m
Sun 1/1108:00 -
2 stops20h 32m
Deal found 9/9$1,254
Wed 11/1110:10 -
1 stop28h 25m
Mon 30/1111:20 -
1 stop26h 02m
Deal found 10/9$1,257
Sat 7/1120:09 -
1 stop39h 16m
Mon 16/1114:00 -
2 stops23h 54m
Deal found 8/9$1,259
Tue 20/1020:00 -
1 stop41h 30m
Tue 27/1014:00 -
2 stops22h 54m
Deal found 8/9$1,265

Find flight deals from Seattle to Sydney

Round-trip from

$1,183

One-way from

$685

Popular in

December

Cheapest in

August

Average price

$1,439
Air Canada
  • Air Canada
  • 20/10-27/10
  • 2 total stops
  • 45h 37m total
  • Seattle to Sydney
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24/10-31/12
  • 24/10-31/12
  • 1 total stop
  • 40h 25m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($479 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($115 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Seattle to Sydney that are best for you.

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Route

Depart

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Price

Cheapest return flight

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 17/11

20:09-06:25

1 stop39h 16m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$692
Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 18/11

12:45-09:05

2 stops25h 20m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$795

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 25/11

08:30-07:00

2 stops27h 30m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$795

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 4/11

12:45-09:20

2 stops25h 35m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$795

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 24/10

15:55-07:00

2 stops45h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$803

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 3/11

12:20-07:00

3 stops47h 40m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$803

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 17/9

08:41-20:10

2 stops42h 29m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,043

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 27/9

12:50-07:20

3 stops49h 30m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,053

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 31/12

05:15-08:30

2 stops32h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,066

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 11/12

05:30-08:30

2 stops32h 00m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$1,067

Flights are sorted by cheapest return flights first.

Deals found on 12/9

Showing 1-10 of 22 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Seattle with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Seattle to Sydney

How far ahead should I book a flight from Seattle to Sydney?

The price you pay for your flight from Seattle to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 23 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Sydney?

Currently, August is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,121). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,481). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Seattle to Sydney?

Airfare is below average for this route at the moment.

Seattle to Sydney flights typically cost between $1,381 and $1,510 in October.
The cheapest return price found within the last 5 days was $1,183 on Air Canada (20 Oct–27 Oct).

Related info for your journey

  • How long is the flight from Seattle to Sydney?

    United Airlines, Delta, and Cathay Pacific can get you from Seattle to Sydney in just under 20h 56m. Your travel time can differ by up to 20h 02m. Airlines will cover a distance of 12463 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Seattle to Sydney one-way?

    The cheapet airlines for a one-way flight from Seattle to Sydney are United Airlines ($559), Qantas Airways ($742), and Air Canada ($746).

  • Can I find deals for flights from Seattle to Sydney that include hotel bookings?

    Yes. In addition to deals on Seattle to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Sydney.

  • Can I find deals for business class flights from Seattle to Sydney?

    Yes. Cheapflights offers flight deals from Seattle to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Sydney?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,121). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,481). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Penrith
Manly
Katoomba
Lithgow
Cronulla
Terrigal
Leura
Randwick
Bondi Beach
Coogee

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to Sydney

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Portland to Coolangatta flights
Seattle to Coolangatta flights

Fly with Cheapflights

How does Cheapflights help users find flights from Seattle to Sydney?

Deals for Seattle to Sydney flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Sydney?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Sydney for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Sydney with no change fees?

Need flexible booking options for your flight to Sydney from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Sydney become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Sydney flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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