Many private pilots don't file flight plans for local flights, they aren't required. I know I wouldn't file a flight plan to go from the closest GA airport to to my house to my work locations, it's less than 40 miles as the crow flies. I'd contact Seattle Center, tell them I'm flying direct to the appropriate airport from my departure point and get my altitude assignment. Everything is done at that point, other than landing at my destination. I would be flying through controlled air space the whole way and through the traffic patterns of THREE major airports, possibly landing at one of two of them depending on my work schedule