London Underground's Piccadilly Line provides the most cost-effective rail route between Heathrow and the capital.
Can I use my oyster on the Elizabeth Line to Heathrow?
Yes, Oyster cards are accepted for most journeys, except for stations west of West Drayton. Contactless payment cards are accepted at all stations on the Elizabeth line, or if you use an Oyster card, you can buy a paper ticket if you're travelling beyond West Drayton.