The average train between Llanelli and Heathrow Terminal 4 takes 4h 32m and the fastest train takes 3h 52m. There is a train service every few hours from Llanelli to Heathrow Terminal 4. 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 hourly between Llanelli and Heathrow Terminal 4. The earliest departure is at 5:03 AM in the morning, and the last departure from Llanelli is at 11:10 PM which arrives into Heathrow Terminal 4 at 7:57 AM. All services require a transfer at Swansea and take an average of 4h 32m. The schedules shown below are for the next available departures.


3h 54m • 2 changes


3h 54m • 2 changes


4h 6m • 2 changes


4h 6m • 2 changes


3h 54m • 2 changes


3h 54m • 2 changes


4h 6m • 2 changes


4h 6m • 2 changes


3h 54m • 2 changes


3h 54m • 2 changes


4h 6m • 2 changes


4h 6m • 2 changes
Want to know about travelling from Llanelli to Heathrow Terminal 4? 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 Llanelli to Heathrow Terminal 4. However, there are services departing from Llanelli station and arriving at Heathrow Terminal 4 station via London Paddington. The journey, including transfers, takes approximately 4h 32m.
Llanelli to Heathrow Terminal 4 train services, operated by Transport for Wales, depart from Swansea station.
Llanelli to Heathrow Terminal 4 train services, operated by Transport for Wales, arrive at London Paddington station.
Book your Llanelli to Heathrow Terminal 4 train tickets online with Transport for Wales, Great Western Railway (GWR) and Elizabeth Line (TfL).
The distance between Llanelli and Heathrow Terminal 4 is 258 km. The road distance is 350 km.
Great Western Railway (GWR) operates a train from Swansea to London Paddington hourly. Tickets cost £85–170 and the journey takes 2h 52m.