Flight Tacoma International Airport departs from Seattle Tacoma International Airport at 06:02 and arrives at Dallas Fort Worth International Airport at 12:03.The flight has a short stop at Dallas.
The flighttime is about 4h 01m. The distance travelled ("as the bird flies"): 2841 Km. So the average speed is roughly 707 Km.
There is an 2 hour time difference between Seattle and Dallas