Find the cheapest car hire prices
No, Hertz isn't present at Dulles (IAD).
You can find SiXT rent a car at Washington Dulles International (IAD).
Yes, Enterprise has car rental services at Dulles (IAD)
Yes, there are companies like Caro Car, 1car, Runcar, or Hertz that's not located directly at the airport with either drop-off or shuttle service.
You can find Thrifty, Hertz, Enterprise, Enterprise, National Car, Go Rentals, Budget, Avis, and Sixt at Dulles Airport.