Delta has round-trip flights from Dallas (DFW) to Seattle (SEA) for $179-$200, NONSTOP. Flights May to July. Departures on Tuesday, Wednesday, and Saturday. Very few extended weekends available. Origin/Destination reversible.
A Carry-on bag and also a personal item is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Read More Nonstop Flights: Dallas to/from Seattle $179-$200 r/t [May-July] (Tue, Wed, Sat) – Delta