The average train between Heathrow Terminal 5 and SIS Building takes 1h and the fastest train takes 57 min. The train runs at least 6 times per hour from Heathrow Terminal 5 to SIS Building. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run every 10 minutes between Heathrow Terminal 5 and SIS Building. The earliest departure is at 10:43 AM in the morning, and the last departure from Heathrow Terminal 5 is at 6:53 PM which arrives into SIS Building at 7:52 PM. All services require a transfer at Green Park station and take an average of 1h. The schedules shown below are for the next available departures.

1h • 1 change

57 min • 1 change

1h • 1 change

58 min • 1 change
Want to know about travelling from Heathrow Terminal 5 to SIS Building? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct train from Heathrow Terminal 5 to SIS Building. However, there are services departing from Heathrow Terminal 5 station and arriving at SIS Building station via Green Park station station. The journey, including transfers, takes approximately 1h.
Heathrow Terminal 5 to SIS Building train services, operated by London Underground (Tube), depart from Heathrow Terminal 5 station.
Heathrow Terminal 5 to SIS Building train services, operated by London Underground (Tube), arrive at Green Park station.
The distance between Heathrow Terminal 5 and SIS Building is 25.4 km. The road distance is 31 km.
London Underground (Tube) operates a subway from Heathrow Terminal 5 station to Green Park station every 10 minutes. Tickets cost £15–60 and the journey takes 49 min.