An investigation was launched after the discovery was made at the chalk headland near Eastbourne, East Sussex, by the coastguard and police at 7am on Monday.
The identities have not yet been confirmed, but the bodies were thought to be those of a 42-year-old woman and her five-year-old son from Maidstone in Kent, a Sussex Police spokesman said.
He said: “The deaths are not being treated as suspicious.
“Inquiries are at an early stage and no further information is available at this time.”
A Vauxhall Corsa was believed to have been found at the scene and was being investigated by police in connection with the deaths.
It follows the discovery of three bodies at the base of the cliffs near Eastbourne on Wednesday.
Police said the three deaths were not being treated as suspicious and were not linked to one another.
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