Distance from Southampton to Portsmouth

The straight-line (great-circle) distance between Southampton and Portsmouth is 24.4 kilometres, too close for a flight to make sense. By road it is about 31 km via Portsmouth Road and M27, which takes around 30 min of driving without stops. The map below shows the route, and the calculator recomputes it for any other pair of places.

About this page

This page is for anyone planning a trip from Southampton to Portsmouth, in the United Kingdom. The straight-line distance comes from the haversine formula (great-circle distance). The road distance and driving time are the fastest car route on the OpenStreetMap road network, computed with OSRM; the actual time depends on traffic, stops and the roads you choose. Tap "Calculate distance" in the calculator to redraw the route live.

Frequently asked questions

What is the distance from Southampton to Portsmouth?

In a straight line it is 24.4 km. By road it is about 31 km, roughly 30 min of driving.

How many kilometres by road between Southampton and Portsmouth?

About 31 km on the fastest route via Portsmouth Road and M27, which takes around 30 min by car. Tap "Calculate distance" in the calculator to see the route on the map.

How is this distance calculated?

The straight-line distance uses the haversine formula, which gives the shortest path between two points on the Earth's surface.