Delta, American, and Alaska Airlines have round-trip flights from Phoenix (PHX) to Seattle (SEA, LAS, SFO, MSP, SLC, PDX) for $63-$117, NONSTOP. Flights September to November. Weekends available. Origin/Destination reversible. Seattle is the cheapest. The other destinations are about $100-ish.
Click for more details and booking links Nonstop Flights: Phoenix to/from Seattle, Las Vegas, San Francisco, Minneapolis, Salt Lake, and Portland Oregon $63-$117 r/t [September-November] – Alaska Airlines / Delta / American