Getting from Heathrow Airport to the London Underground (the "Tube") is a straightforward process, as the airport is directly served by the Piccadilly Line. There are three main Underground stations at Heathrow: one shared by Terminals 2 and 3, and individual stations at Terminal 4 and Terminal 5. Following the clearly marked "Underground" signs from the arrivals hall will lead you to the station elevators or escalators. In 2026, you can pay for your journey simply by "tapping" your contactless credit card, mobile wallet, or Oyster card at the yellow readers on the turnstiles; a standard journey to Central London takes approximately 50 to 60 minutes and costs significantly less than the Heathrow Express or a taxi. For a faster but more expensive alternative, the Elizabeth Line also serves the same stations, offering a more modern, air-conditioned experience with fewer stops to major hubs like Paddington and Canary Wharf.