The average train between Llanelli and Heathrow Terminal 4 takes 4h 48m and the fastest train takes 3h 54m. 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 6:31 AM in the morning, and the last departure from Llanelli is at 11:11 PM which arrives into Heathrow Terminal 4 at 8:12 AM. All services require a transfer at Cardiff Central and take an average of 4h 48m. The schedules shown below are for the next available departures.


3h 55m • 2 changes

4h 36m • 2 changes

4h 36m • 2 changes

4h 30m • 2 changes

3h 54m • 2 changes

4h 3m • 2 changes

3h 59m • 2 changes

4h 30m • 2 changes

4h 3m • 2 changes

3h 59m • 2 changes

4h 10m • 2 changes

4h 35m • 2 changes

3h 55m • 2 changes

4h 36m • 2 changes

4h 36m • 2 changes

4h 30m • 2 changesWant 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 Cardiff Central. The journey, including transfers, takes approximately 4h 48m.
Llanelli to Heathrow Terminal 4 train services, operated by Transport for Wales, depart from Llanelli 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.
You can take a train from Llanelli to Heathrow Terminal 4 via Cardiff Central and London Paddington in around 4h 20m.