Parking is free for the first 20 minutes in all lots excluding Valet Parking. The Short Term parking lot is located right in front of Dulles' main terminal building. It is intended primarily for dropping off and picking up passengers. The Daily parking lot is for stays ranging from a few hours to a few days. The Daily Lot is northeast of the terminal.
Daily parking combines the convenience of parking close to the terminal with cheaper rates.
Dulles parking lots do not charge for stays of less than 20 minutes, except for valet parking. A free 24 hour shuttle connects the Long Term lots with the terminal Departures area. For periods of a few hours to several days this is the cheapest option. Allow more time for transportation to the terminal however. Follow signs for Valet Service Center as you enter the parking lot.