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Cheap flights from Seattle to Sydney from C$ 673

SEA — SYD
5 Oct — 12 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 8/93:00 p.m. -
1 stop23h 20m
Tue 22/99:20 a.m. -
1 stop17h 45m
Deal found 4/9C$ 1,250
Tue 8/910:50 a.m. -
1 stop27h 30m
Tue 22/96:00 a.m. -
2 stops21h 05m
Deal found 4/9C$ 1,266
Sat 7/113:15 p.m. -
2 stops27h 25m
Sun 15/1111:20 a.m. -
1 stop17h 12m
Deal found 5/9C$ 1,274
Sat 7/113:15 p.m. -
2 stops27h 25m
Sun 15/116:20 a.m. -
2 stops22h 12m
Deal found 5/9C$ 1,289
Tue 8/93:00 p.m. -
1 stop23h 20m
Sun 20/99:20 a.m. -
1 stop26h 12m
Deal found 4/9C$ 1,447
Thu 15/103:00 p.m. -
1 stop23h 20m
Thu 22/1010:20 a.m. -
1 stop17h 45m
Deal found 1/9C$ 1,456
Sun 25/107:32 a.m. -
1 stop29h 58m
Mon 9/1110:40 a.m. -
1 stop21h 00m
Deal found 3/9C$ 1,465
Mon 26/105:30 a.m. -
2 stops32h 00m
Tue 10/1110:40 a.m. -
1 stop18h 25m
Deal found 3/9C$ 1,471
Sat 24/109:35 p.m. -
1 stop39h 55m
Wed 11/1110:40 a.m. -
1 stop25h 11m
Deal found 3/9C$ 1,476
Sat 21/1111:59 p.m. -
1 stop36h 01m
Tue 15/121:20 p.m. -
1 stop17h 52m
Deal found 4/9C$ 1,498
Tue 8/93:00 p.m. -
1 stop23h 20m
Thu 24/99:20 a.m. -
1 stop26h 12m
Deal found 4/9C$ 1,502

Find flight deals from Seattle to Sydney

Round-trip from

C$ 1,274

One-way from

C$ 673

Popular in

December

Cheapest in

August

Average price

C$ 1,426
Air Canada
  • Air Canada
  • 7/11-15/11
  • 3 total stops
  • 44h 37m total
  • Seattle to Sydney
Search Deals
17/11-31/12
  • 17/11-31/12
  • 1 total stop
  • 39h 16m total
  • Seattle to Sydney
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 471 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 112 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 17/11

9:25 a.m.-8:30 a.m.

2 stops28h 05m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 757

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 16/11

9:25 a.m.-8:30 a.m.

2 stops28h 05m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 757

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Mon 26/10

7:15 a.m.-7:30 a.m.

2 stops30h 15m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 757

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 22/11

12:45 p.m.-9:05 a.m.

2 stops25h 20m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 782

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 21/10

5:00 a.m.-8:00 a.m.

2 stops33h 00m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 788

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Wed 18/11

12:45 p.m.-9:05 a.m.

2 stops25h 20m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 788

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 24/11

12:20 p.m.-7:00 a.m.

3 stops47h 40m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 796

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 17/1

7:32 p.m.-6:20 a.m.

1 stop39h 48m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 806

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Tue 15/9

4:15 p.m.-6:50 p.m.

1 stop33h 35m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 837

SeattleSydney

SEA Seattle/Tacoma Intl - SYD Sydney Kingsford Smith

SEASYD

Seattle/Tacoma Intl

Sun 13/9

1:30 p.m.-6:50 p.m.

1 stop36h 20m

Sydney Kingsford Smith

Wed 31/12

12:00 a.m.-6:00 a.m.

Nonstop0h 00m

C$ 837

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

Showing 1-10 of 19 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 round-trip 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 best time to book flights from Seattle to Sydney is 23 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 C$ 1,111). Flying from Seattle to Sydney in December is currently the most expensive (average of C$ 2,350). 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 to fly round-trip from Seattle to Sydney?

Airfare is below average for this route at the moment.

Seattle to Sydney flights typically cost between C$ 1,368 and C$ 1,496 in November.
The cheapest round-trip price found within the last 5 days was C$ 1,274 on Air Canada (7 Nov-15 Nov).

Related info for your journey

  • How long is the flight from Seattle to Sydney?

    A quick flight from Seattle to Sydney can take about 18h 30m. United Airlines provides one of the quickest options available for as low as C$ 1,568. Seattle and Sydney are separated by a distance of 12463 km.

  • 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 vacation 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 C$ 1,111). Flying from Seattle to Sydney in December is currently the most expensive (average of C$ 2,350). 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
Bondi Beach
Parramatta

Browse thousands of different options on Cheapflights for your next trip

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Sydney flexibly with Cheapflights today.

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Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Sydney from Seattle today and book when prices fit your budget.

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