The average train between Cardiff and Millwall takes 2h 27m and the fastest train takes 2h 16m. The train service runs several times per day from Cardiff to Millwall. 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 3 times a day between Cardiff and Millwall. The earliest departure is at 8:50 AM in the morning, and the last departure from Cardiff is at 8:22 PM which arrives into Millwall at 10:44 PM. All services require a transfer, and take on average 2h 27m. The schedules shown below are for the next available departures.

2h 31m • 1 change

2h 31m • 1 change

2h 16m • 1 change

2h 16m • 1 change
Want to know about travelling from Cardiff to Millwall? 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 Cardiff to Millwall. However, there are services departing from Cardiff station and arriving at Millwall station via London Paddington. The journey, including transfers, takes approximately 2h 27m.
Cardiff to Millwall train services, operated by Great Western Railway (GWR), depart from Cardiff Central station.
Cardiff to Millwall train services, operated by Great Western Railway (GWR), arrive at London Paddington station.
Book your Cardiff to Millwall train tickets online with Great Western Railway (GWR) and Elizabeth Line (TfL).
The distance between Cardiff and Millwall is 218.5 km. The road distance is 244 km.
Great Western Railway (GWR) operates a train from Cardiff Central to London Paddington hourly. Tickets cost £65–120 and the journey takes 2h 21m.