The cheapest times to fly from SEA to LST are

  • January 29th to June 3rd (except the week of April 2nd)
  • August 6th to August 26th
  • October 22nd to December 2nd (except the week of November 19th)

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 LST is late February and early March. Prices can be as high as $3301 for Thursday flights during mid December, or as low as $1411 for Tuesday flights around late February and early March.


When to Fly to Launceston

Flying from Seattle, WA (SEA) to Launceston (LST) will usually cost between $1499 to $2500 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late February and early March with an average ticket price of $1498. Due to high demand the most expensive time to fly is mid December, with an average price of $2844. Planning your trip to low-cost times can easily save you $1346 on economy flights and even more on first-class flights. Generally, any price below $1699 can be considered a good price for a round-trip SEA to LST flight.

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

SEA to LST Flight Prices

Compared to other flights, the SEA to LST flight is more expensive than the average and costs more than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.13, 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. Thursdays are the most expensive days to fly to Launceston, and Fridays are the most expensive days to return to Seattle. Selecting flights on the least expensive days could save you up to $185 (10%) 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 $1667. Return trip prices are from the LST 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 LST can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 15 hour 51 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from SEA to LST while comparing.

Destination alternative #1: Hobart Airport (HBA) in Hobart

  • 90 miles (145 km) away from LST
  • Usually 2.77% less expensive than LST
  • 2-layover flights available

See SEA to HBA flights


Flight Hacking SEA to LST

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 LST — but Champion Traveler does!

Hack #1: Sydney (SEA > SYD > LST)

  • Price for both tickets: $1282
  • Average savings: $417 (24.52%)

See SEA to SYD flights

Hack #2: Melbourne (SEA > MEL > LST)

  • Price for both tickets: $1299
  • Average savings: $400 (23.52%)

See SEA to MEL flights

Hack #3: Brisbane (SEA > BNE > LST)

  • Price for both tickets: $1389
  • Average savings: $310 (18.25%)

See SEA to BNE flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 11 major airlines flying this route most often: Air Canada, Air New Zealand, Alaska, Cathay Pacific, China Eastern, Delta, Qantas, Singapore Airlines, United, Virgin Atlantic, Virgin Australia, and potentially more during busy seasons.

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

The distance between the two airports is roughly 8257 miles or 13288 kilometers.

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

The real-world flight time for a nonstop SEA to LST flight is about 15 hour 51 minutes.

How many flights go between Seattle, WA and Launceston?

It depends on the day of the week and the date, but a typical day might have around 18 available flights from SEA to LST.


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 LST
Destination airport name Launceston Airport
City Launceston
Country Australia
Latitude -41.5
Longitude 147.2


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.