Flight Tacoma International Airport departs from Seattle Tacoma International Airport at 13:00 and arrives at Boston General Edward Lawrence Logan International Airport at 23:17.The flight has a short stop at New York.
The flighttime is about 7h 17m. The distance travelled ("as the bird flies"): 5698 Km. So the average speed is roughly 782 Km.
There is an 3 hour time difference between Seattle and Boston