Roundtrip St Louis to Seattle Nonstop Flights on Alaska Airlines

No special codes or coupons are required. Get these roundtrip flights while available.

This deal on roundtrip St Louis to Seattle nonstop flights expires on May 31, 2026.

Travel is available on select dates:

• Departing St Louis (STL): February 7, 10-11, 14, 18, 24-25, 28; March 3-4, 10, 17-18, 24-25, 31; April 1, 4, 7-8, 11, 14-15, 18, 21-22, 25, 28-29; May 5-6, 12-13, 16
• Departing Seattle (SEA): February 10, 17-18, 21, 24-25, 28; March 3-4, 7, 10-11, 17, 31; April 1, 7-8, 11, 14-15, 18, 21, 25, 28-29; May 2, 5-6, 9, 13, 19-20