The Heathrow Express station is close to T3. Once you start down the ramp to the inter-terminal walkway it's only about 2 minutes to the station entrance. Add a couple more minutes to get from Arrivals to that ramp, plus 2-4 minutes to reach the platforms by lift or escalators.
What tube line is Heathrow Terminal 3 on?
the Piccadilly lineServing Terminals 2, 3, 4 and 5, the Piccadilly line runs a frequent service between the airport and a number of locations in central London, along with convenient connections to other Tube and rail services.
Is there a train station inside Heathrow airport?
Heathrow Airport has three stations: Heathrow Terminals 1-2-3, Heathrow Terminal 4 and Heathrow Terminal 5. You can travel between the terminals free of charge. From all three Heathrow Airport stations, the Heathrow Express train runs direct to London Paddington station. It takes 15-21 minutes to complete the journey.