To guarantee a fast and comprehensive security procedure, Washington Dulles International Airport is manned by highly skilled employees and outfitted with cutting-edge security screening equipment. In order to give themselves enough time for check-in, security screening, and any necessary customs processes, passengers are urged to arrive at least two hours before their flight for domestic travel and three hours before an international trip. For travelers who qualify, United Airlines IAD Terminal has TSA Pre Check lanes, which speed up the security check process.