If you’re arriving at Terminal 2, Terminal 3, follow signs to the Heathrow Express station. From there, take a Heathrow Express service to London Paddington – transfer time is 15 minutes.
In Terminal 5 the station is at basement level and reached by lift or escalator. All trains call at Heathrow Terminals 2 and 3 and then run non-stop to London Paddington – total transfer time is 21 minutes.
In Terminal 4, take the free transfer to Heathrow Terminals 2 and 3 (departures every 15 minutes, travel time four minutes). From there, take a Heathrow Express service to London Paddington – transfer time is 15 minutes.
see as : https://www.heathrowexpress.com/timetable-schedule/heathrow-london
In Terminal 5 the station is at basement level and reached by lift or escalator. All trains call at Heathrow Terminals 2 and 3 and then run non-stop to London Paddington – total transfer time is 21 minutes.
In Terminal 4, take the free transfer to Heathrow Terminals 2 and 3 (departures every 15 minutes, travel time four minutes). From there, take a Heathrow Express service to London Paddington – transfer time is 15 minutes.
see as : https://www.heathrowexpress.com/timetable-schedule/heathrow-london
free shuttle bus or heathrow express (free)