Nonstop Flights: Seattle to/from Denver, Oakland, or Phoenix $91-$124 round-trip [April-May] – Southwest / United / Delta / Alaska Airlines

Southwest, United, Alaska Airlines, and Delta have posted competing round-trip flights from Seattle (SEA) to Denver, Oakland, or Phoenix (DEN, OAK, PHX) for $91-$124, NONSTOP. Flights April to May. Weekends…