If what you are looking for is the utmost comfort and peace of mind when transferring from the airport to the Washington DC area, you can opt for a black car service.
The best option is to book online and in advance the transfer to or from the airport so you will have your own driver waiting for you and you don't have to negotiate prices with cabs or transfer companies. You can get from 118 USD a vehicle for 3 people. There are also 6-seater cars and minibuses for 10 passengers.
Reservations must be made at least 24 hours in advance and there is free cancellation up to 24 hours before. At the airport the driver will be waiting for you with a sign with your name on it, as soon as you leave the baggage claim area and enter the public arrivals hall. If you are in a hotel or apartment, the driver will be waiting outside the building. If you have the possibility to park your vehicle, sometimes you can wait for them at the reception.
For airport transfers you must indicate the scheduled arrival time of your
flight.
Dulles International Airport offers Smarte Carte luggage carts for rent. These are
located on the departures level (curbside), on the arrivals level next to the
baggage claim carousels and in the international arrivals hall next to the baggage
claim carousels.
The cars can be rented with a credit card or cash.
Normally they wait 1 hour from the actual landing time of the
flight.
Dulles International Airport offers Smarte Carte luggage carts for rent. These are
located on the departures level (curbside), on the arrivals level next to the
baggage claim carousels and in the international arrivals hall next to the baggage
claim carousels.
The cars can be rented with a credit card or cash.