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Both Alaska and Delta Airlines have round trip airfares travelling to and from Denver (DEN) and Seattle (SEA) for $ 156 including taxes and fees. This is nonstop service. On Delta, it is a basic economy fare so choose Alaska if schedule permits.

Travel Availability:
Departs DEN: Most Tues Wed Thur Fri beginning Oct thru March 13, 2018
Departs SEA: Most Tues Wed Thur Fri beginning Oct thru March 13, 2018

Use dates and book it on Priceline [priceline.com], Expedia [expedia.com] or Delta Airlines [delta.com] directly. Bundling hotel will save you money.