SEA is a good option.

Mainline non-stops to ATL, CVG, DFW, SLC and JFK. All DL flights operate out of the brand new A gates, which has fairly nice Crown Room.

Plus, there are non-stops to NRT, TPE, AMS, HNL, MSP, DTW, MEM, EWR, IAH, CLE and ANC on SkyTeam partner airlines.