| Nonstop Flights: Austin to/from Seattle $113-$114 r/t [April-June] â Alaska Airlines Alaska Airlines has round-trip flights from Austin (AUS) to Seattle (SEA) for $113-$114, NONSTOP. Flights April to June. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. Click for more details and booking links Nonstop Flights: Austin to/from Seattle $113-$114 r/t [April-June] â Alaska Airlines . | 
