London Heathrow is one of the best-connected airports in the world for rail travel. Three separate train services link it to central London, each with different trade-offs on speed, cost, and convenience.
Heathrow Express
The Heathrow Express is the fastest option, running non-stop between Heathrow Central (Terminals 2 and 3) and London Paddington in 15 minutes, with a separate branch to Terminal 5 taking 21 minutes. Trains run every 15 minutes from around 05:10 to 23:25. The standard walk-up fare is £25 one way, but booking online in advance can reduce this to as little as £5.50. It is the right choice when time is tight or when you are travelling with heavy luggage and want a guaranteed seat.
Elizabeth line
The Elizabeth line (formerly Crossrail) is the best value rail option for most passengers. It serves Heathrow Terminals 2, 3, and 4 (Terminal 5 requires a change at Terminal 2/3 or a separate Heathrow Express leg). From Paddington the journey takes around 26 minutes; from Liverpool Street around 50 minutes. Fares are standard Tube prices — roughly £12–£13 from central London with an Oyster or contactless card, or £5.10 with a railcard. Trains run every 10 minutes during the day.
Piccadilly line
The Piccadilly line is the cheapest option and the only one that runs through the night on Fridays and Saturdays. It serves all terminals and connects directly to King's Cross St Pancras, Leicester Square, and Earls Court. The journey from central London takes 45–60 minutes depending on your starting point. Fares are standard Tube prices. The main drawback is that the line stops at every station, making it slow and crowded during peak hours — but for an early morning or late night flight it is hard to beat.
Which service should you choose?
For most passengers the Elizabeth line offers the best balance of speed, cost, and comfort. Use the Heathrow Express if you are running late or travelling on expenses. Use the Piccadilly line for very early or very late flights, or if you are on a tight budget and have time to spare. If you are travelling from south or east London, the Elizabeth line is almost always the most convenient option.
Luggage and accessibility
All three services have space for standard suitcases, but the Heathrow Express has the most generous luggage provision and dedicated overhead racks. The Elizabeth line has good step-free access at Heathrow and most central London stations. The Piccadilly line has step-free access at Heathrow but not at all intermediate stations — check the TfL website if you need step-free travel throughout your journey.
Practical tips
Always use an Oyster or contactless card on the Elizabeth line and Piccadilly line — buying a paper ticket costs significantly more. If you are connecting from another National Rail service, check whether your ticket includes onward travel to Heathrow. Terminal 4 is on a separate loop of the Elizabeth line and Piccadilly line — if you are flying from Terminal 4, allow extra time or take the Heathrow Express from Paddington directly.