Verified answer

It's 447miles according to google maps. The most commonly used mode of transport is probably by Plane, if you mean by car you can drive to Dover and take either the Eurotunnel or the Ferry. You can also go Portsmouth to Le Havre and then drive to Paris.

or you can catch a train from Cardiff to London Paddington; then the Underground to St Pancras and a Eurostar train to Paris

www.firstgreatwestern.co.uk

www.eurostar.com