Dulles lies in two unincorporated communities, Chantilly and Dulles. It is west of Herndon and southwest of Sterling. Washington Dulles Airport is the largest airport in the Washington metropolitan area. It is one of the nation's busiest airports. The airport has over 23 million passengers a year. Daily, more than 60,000 passengers leave Washington Dulles to more than 125 destinations around the world. Dulles is the busiest airport in Virginia. It is also the busiest in the Baltimore Washington Metropolitan Area. It is accessible via the Washington Metro's Silver line.