The journey from Dumbarton to Southampton is a significant cross-country trip of over 700 km. You will travel by train from Dumbarton to Glasgow, then take an Avanti West Coast service to London Euston. From London, you must transfer to London Waterloo for a South Western Railway service to Southampton Central. This journey typically takes 7 to 8 hours. It is a major transit route connecting the Scottish coast to the English south coast.
Total Distance: 720 km driving, 630 km air distance.
Use the London Underground or a taxi to transfer between Euston and Waterloo.
June to August for the best weather in the coastal city of Southampton.