Heathrow and its terminals are serviced by the Heathrow Hoppa bus which travels between all the hotels in the area collecting guests and dropping them off at each terminal. The cost of the Hoppa Bus is £4.50 each way. In some cases such as the Holiday Inn Slough a taxi service is provided and the cost is already included within the price of your booking.
Hotels such as the Sofitel and Hilton Terminal 4 are so close to the airport that customers can walk to flight check in.