Washington Dulles International Airport is served by 56 airlines, flying from/to 81 destinationsLongest flight from Washington Dulles International Airport is Washington to 🇿🇦 Cape Town (CPT), which takes around 14 hours and 50 minutes. On an airline like United Airlines. More info on this flight route (IAD-CPT).Shortest flight from Washington Dulles International Airport is Washington to 🇺🇸 Teterboro (TEB), which takes around 40 minutes. On an airline like Netjets Aviation. More info on this flight route (IAD-TEB).