Flight Tacoma International Airport departs from Seattle Tacoma International Airport at 05:15 and arrives at Boston General Edward Lawrence Logan International Airport at 15:38.The flight has a short stop at Denver.
The flighttime is about 7h 23m. The distance travelled ("as the bird flies"): 5698 Km. So the average speed is roughly 772 Km.
There is an 3 hour time difference between Seattle and Boston