The average train between London and Dumbarton takes 6h 30m and the fastest train takes 5h 57m. There is a train service every few hours from London to Dumbarton. 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 London and Dumbarton. The earliest departure is at 5:48 AM in the morning, and the last departure from London is at 8:03 PM which arrives into Dumbarton at 6:15 AM. All services require a transfer, and take on average 6h 30m. The schedules shown below are for the next available departures.

5h 58m • 1 change

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6h 40m • 1 change

6h 28m • 1 change

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6h • 1 change
Want to know about travelling from London to Dumbarton? 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 London to Dumbarton. However, there are services departing from London station and arriving at Dumbarton station via Edinburgh Waverley. The journey, including transfers, takes approximately 6h 30m.
London to Dumbarton train services, operated by London North Eastern Railway Limited (LNER), depart from King's Cross station.
London to Dumbarton train services, operated by London North Eastern Railway Limited (LNER), arrive at Dumbarton Central station.
Book your London to Dumbarton train tickets online with London North Eastern Railway Limited (LNER), ScotRail and Caledonian Sleeper.
The distance between London and Dumbarton is 573.2 km. The road distance is 721 km.
You can take a train from King's Cross to Dumbarton Central via Edinburgh Waverley in around 6h 17m.