The cheapest times to fly from SEA to SYD are

  • January 29th to March 25th (except the week of February 12th)
  • May 7th to June 3rd
  • July 30th to November 18th (except the week of October 8th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to SYD is late August to early September. Prices can be as high as $2119 for Saturday flights during late December, or as low as $876 for Tuesday flights around late August to early September.


When to Fly to Sydney

Flying from Seattle, WA (SEA) to Sydney (SYD) will usually cost between $960 to $1643 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late August to early September with an average ticket price of $915. Due to high demand the most expensive time to fly is late December, with an average price of $1917. Planning your trip to low-cost times can easily save you $1002 on economy flights and even more on first-class flights. Generally, any price below $1143 can be considered a good price for a round-trip SEA to SYD flight.

See below for a graph of average weekly prices for the SEA to SYD route. All prices are for round-trip tickets in USD.

SEA to SYD Flight Prices

Compared to other flights, the SEA to SYD flight is slightly more expensive than the average and costs about as much as the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.09, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $112 (9%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1111. Return trip prices are from the SYD to SEA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SEA to SYD can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 14 hour 56 minutes may not be realistic.


Flight Hacking SEA to SYD

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SEA to SYD — but Champion Traveler does!

Hack #1: Honolulu, HI (SEA > HNL > SYD)

  • Price for both tickets: $1082
  • Average savings: $62 (5.38%)

See SEA to HNL flights

Hack #2: Hong Kong (SEA > HKG > SYD)

  • Price for both tickets: $1087
  • Average savings: $56 (4.9%)

See SEA to HKG flights

Hack #3: Shanghai (SEA > PVG > SYD)

  • Price for both tickets: $1095
  • Average savings: $48 (4.2%)

See SEA to PVG flights


Flight Questions Answered

Still have questions about flying from SEA to SYD? We’ve got answers.

Which airlines fly this route?

You can find 34 major airlines flying this route most often: Air Canada, Air China, Air France, Air New Zealand, Air Tahiti Nui, Alaska, American, ANA, Asiana, Avianca, British Airways, Cathay Pacific, China Airlines, China Eastern, China Southern, Delta, Emirates, EVA Air, Fiji Airways, Hainan, Hawaiian, JAL, Jetstar, Korean Air, Malindo Air, Qantas, Scoot, Singapore Airlines, Tigerair, United, Virgin Atlantic, Virgin Australia, WestJet, Xiamen, and potentially more during busy seasons.

How far away is it from Sydney International Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 7748 miles or 12469 kilometers.

How long does it take to fly from SEA to SYD?

The real-world flight time for a nonstop SEA to SYD flight is about 14 hour 56 minutes.

How many flights go between Seattle, WA and Sydney?

It depends on the day of the week and the date, but a typical day might have around 92 available flights from SEA to SYD.


Airport Location Info


Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

Return Airport

Destination code SYD
Destination airport name Sydney International Airport
City Sydney
Country Australia
Latitude -33.9
Longitude 151.2


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.