Pittsburgh has flights to Seattle. https://www.usatoday.com/story/travel/flights/todayinthesky/2017/11/15/alaska-airlines-adds-pittsburgh-its-route-map/8676250

Pittsburgh has flights to Seattle. https://www.usatoday.com/story/travel/flights/todayinthesky/2017/11/15/alaska-airlines-adds-pittsburgh-its-route-map/867625001/ https://www.usatoday.com/story/travel/flights/todayinthesky/... Also, Northern Virginia is the location of Dulles. Montgomery county would also use Dulles or BWI which has 3 flights per day. Interestingly, with traffic, Washington D.C. is not within 45 minutes of Dulles so Washington D.C. is probably just looking at Reagan which has 1 flight per day to Seattle.