London to Cardiff by train Find train times and tickets

Prices explained

Prices explained

At Loco2 we believe in price transparency. We use real data from Loco2 searches to estimate the cheapest fares you should be able to find for your journey.

The cheapest price is the lowest fare we've ever found for this journey. These prices can usually be found by searching when booking opens but they vary due to availability, which depends on factors like the day of the week or time of year.

More popular journeys include 30 day advance and 7 day advance prices. These are updated every two weeks using prices we've found by searching exactly 7 or 30 days from the most recent Thursday (we picked Thursday because this is when average prices are usually found).

30 day and 7 day prices fluctuate based on demand and availability at the time of search. For example, the 7-day price in summer is likely to be more expensive than the same journey in winter.

Prices are sourced in GBP and converted to other currencies using the daily market exchange rate.

We're always seeking to improve how price-checking works, and we welcome feedback on how we can make it better.

More advice about how to find the cheapest tickets can be found in our infographic.

  1. Cheapest price $24.76
  2. 30 day advance $61.30
  • First train
  • Last train
  • Avg changes
  • Fastest journey
    1hr 59m
  1. It is easy to travel by train from London to Cardiff. The best option is to use the Great Western Railway (GWR) services which leave London every 30 minutes on Mondays to Fridays and hourly at weekends, with most trains taking about 2 hrs 15 mins to reach Cardiff.

    The journey from London to the Welsh capital includes some fine countryside as the train speeds west via the Thames Valley and Wiltshire to reach the River Severn. It dives under the river in a long tunnel, emerging in Wales.

    Bookings for this journey typically open 10 to 12 weeks in advance of travel. There are some reasonably good ticket deals on this route, provided you are willing to opt for off-peak trains and can book a month or two prior to travel.


    London Paddington to Cardiff Central

    The direct Great Western trains to Cardiff leave from London Paddington station and arrive at Cardiff Central. Most trains make four or five stops on the 234-km journey. The main towns on the route are Reading and Swindon. Later in the journey, the train skirts the northern edge of Bristol, stopping at the out-of-town Bristol Parkway station. Shortly after leaving that station, the train uses the Severn Tunnel to reach Wales.

Search accommodation in Cardiff


Other journeys to Cardiff View all journeys to Cardiff

Country guide

Trains to the UK

Read our country guide

Child and youth passengers

The definition of "Child" and "Youth" varies by country and rail operator. This is why we ask for the age of young passengers.

Sometimes children below a certain age can travel without a seat for free. If you want to guarantee a seat for child passengers, enter '6' as the age of the child.

Read more about child and youth passenger ages. See also youth discounts and railcards.

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