Most hotels near SeaTac are not that great. Cedarbrook lodge is probably the nicest option.

Not sure if you are transiting overnight, or just have an early flight. If the latter, I’d consider just staying downtown. An Uber from downtown at 6am takes under 20 minutes. Meanwhile, because of the way the roads near SEA are laid out, the drive from the airport hotels on Tukwila Int’l Blvd to the airport to departures can take 10 minutes or more if you’re unlucky with the red lights (plus add in waiting for the shuttle…) So, staying in SeaTac might not actually save much time.