The estimated journey time from London to Southampton is 2 hours and 10 minutes, but on a good day when there are no traffic the driver can do it in less than 2 hours it is around 80 miles (128 km).
It is a very straightforward journey out of London, the drive towards Heathrow airport using A4 road, one of the most iconic buildings on the route has to be Harrods in Knightsbridge followed by the V&A museum, and the natural history museum on Cromwell road. Follow in to Else Court and you can see the famous Ark building and The Fuller’s Griffin Brewery (London Pride Beer) sometimes you can even smell the beer brewing on the way out to the M4 motorway for 3 junctions passing the junction for (M4 junctions 4) Heathrow airport terminal 2, 3 joined the M25 at Junction 5 on the M4 for 3 junctions on the M25 southbound (clockwise) and then join the M3 at junction 12, M25 and from there it is a straight journey (51 miles) all the way down to the M3 junction 14, M27 and then here you have a few options you can either go round the M27 westbound or cut through the Centre of Southampton.
By using M27 motorway you will come to Southampton from the Westside Down by the docs and follow it straight to the terminal while passing the cargo containers on the way.
If you take the A33 instead, you will come straight through the center of Southampton. This is definitely the most scenic route into Southampton where you get to see more of the city until you reach your cruise terminal.
Whichever option you take to come into Southampton it is approximately 15 to 20-minute drive from when you exit the M3 junction 12.