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Delta Airlines [delta.com] have roundtrip airfares from Boston (BOS) to Seattle (SEA) for $ 216. This is nonstop service. The next best fare for nonstop is on Alaska Airlines for almost $ 100 more.

Travel Availability:
beginning departures Jan 11 – Feb 1, daily except Tuesdays
returns Jan 11 – Feb 8

My sample travel dates Jan 11-18, 2017

Book it on Expedia [expedia.com], Priceline [priceline.com], Orbitz [orbitz.com] or CheapOAir [cheapoair.com].