This is the Stonehenge postcode SP4 7DE, so if you got one of those satnav, you can just key the postcode in and it will give you the direction on how to get there. But if you don’t have a satnav, you can use this information I got from Stonehenge website as a guide of getting there.
2 miles west on the junction of A303 and A344/360
From London Gatwick Airport
Take the M23 motorway and join the M25 motorway, following the signs for Heathrow Airport.
From the M25, exit at junction 12 for the M3 motorway towards Basingstoke.
Once on the M3 follow it to junction 8 signed A303 Andover.
Continue on the A303 ALL the way until you reach a roundabout.
Go straight over this and 2 miles on bear right onto the A344 and the car park is on the right hand side about 500 metres on.
From London Heathrow Airport
Follow signs to the M4 West.
Continue for about 2 miles and come off at junction 4b onto the M25 South bound.
Follow the signs for Gatwick Airport. From the M25, exit at junction 12 for the M3 motorway towards Basingstoke.
Then follow the directions as above.
I am sure you won’t miss it, as you can see the big stones on the roadside when you’re at the area. I have been there recently and took these lovely photos of Stonehenge.