Alaska Airlines has roundtrip airfares to and from Kansas City (MCI) and Seattle (SEA) for $196 or $206 including taxes/fees. This is nonstop service.
Travel Availability for $196
Departs MCI: Jan 31; Feb 4, 7
Departs SEA: Jan 31; Feb 1, 4, 7, 8, 11, 14
Travel Availability for $206
Departs MCI: Feb 1, 3, 8, 10
Departs SEA: Feb 2, 3, 5, 6, 9, 10, 12, 13.
Book it on Alaska Airlines