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Cheap flights from Seattle to Sydney from $668

SEA — SYD
10 Dec — 17 Dec1
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

Mon 9/1121:30 -
1 stop41h 20m
Wed 18/1111:30 -
1 stop26h 15m
Deal found 7/11$1,559
Fri 6/1121:30 -
1 stop41h 20m
Fri 20/1111:30 -
1 stop26h 15m
Deal found 5/11$1,602
Sun 8/1121:30 -
1 stop41h 20m
Fri 20/1111:30 -
1 stop26h 15m
Deal found 5/11$1,612
Sun 8/1121:30 -
1 stop41h 20m
Wed 18/1111:30 -
1 stop26h 15m
Deal found 5/11$1,641
Fri 6/1107:00 -
1 stop17h 45m
Thu 26/1121:40 -
1 stop17h 40m
Deal found 5/11$1,644
Fri 6/1121:30 -
1 stop41h 20m
Wed 18/1111:30 -
1 stop26h 15m
Deal found 5/11$1,685
Thu 12/1107:00 -
1 stop17h 45m
Thu 19/1121:40 -
1 stop27h 28m
Deal found 5/11$1,688
Mon 23/1107:00 -
1 stop17h 45m
Tue 1/1221:40 -
2 stops28h 40m
Deal found 6/11$1,702
Mon 16/1107:00 -
1 stop17h 45m
Tue 24/1121:40 -
1 stop18h 45m
Deal found 5/11$1,717
Sun 8/1117:59 -
1 stop20h 01m
Mon 23/1111:10 -
1 stop18h 53m
Deal found 6/11$1,730
Mon 23/1107:00 -
1 stop17h 45m
Thu 3/1221:40 -
2 stops21h 03m
Deal found 6/11$1,731

Find flight deals from Seattle to Sydney

Round-trip from

$1,301

One-way from

$668

Popular in

December

Cheapest in

September

Average price

$1,664
Philippine Airlines
  • Philippine Airlines
  • 18/4-25/4
  • 2 total stops
  • 65h 50m total
  • Seattle to Sydney
Search Deals
Philippine Airlines
  • Philippine Airlines
  • 29/3-31/12
  • 1 total stop
  • 39h 50m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($532 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($143 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 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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Price

Cheapest return flight
Fastest return journey

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 30/3

12:00-06:30

1 stop24h 30m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$798

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Fri 5/2

10:33-06:25

2 stops24h 52m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$875

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Thu 25/2

08:20-06:25

2 stops27h 05m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$875

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sat 21/11

23:59-09:20

2 stops38h 21m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$930

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 16/11

08:30-09:05

2 stops29h 35m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$930

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 22/11

05:05-09:20

2 stops33h 15m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$930

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

$930

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 30/3

11:25-07:50

2 stops26h 25m

Sydney Kingsford Smith

Wed 31/12

00:00-06:00

Nonstop0h 00m

$931

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 4/5

15:40-06:30

1 stop21h 50m

Sydney Kingsford Smith

Tue 29/6

10:20-20:30

1 stop27h 10m

$1,611

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 22/2

13:13-09:20

1 stop25h 07m

Sydney Kingsford Smith

Wed 3/3

11:20-21:17

2 stops28h 57m

$1,806

Flights are sorted by cheapest return flights first.

Deals found on 8/11

Showing 1-10 of 18 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, September is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,512). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,831). 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 $1,541 and $1,898 in April.
The cheapest return price found within the last 5 days was $1,301 on Philippine Airlines (18 Apr–25 Apr).

Related info for your journey

  • How long is the flight from Seattle to Sydney?

    Alaska Airlines and United Airlines can get you from Seattle to Sydney in just under 21h 50m. Your travel time can differ by up to 3h 17m. 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 Air Canada ($719), United Airlines ($733), and Qantas Airways ($770).

  • 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, September is the cheapest month in which you can book a flight from Seattle to Sydney (average of $1,512). Flying from Seattle to Sydney in December is currently the most expensive (average of $2,831). 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
Cronulla
Katoomba
Terrigal
Lithgow
Randwick
Leura
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

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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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