The calculated distance (air line) between Chalfont St Giles and Amersham on the Hill is approximately 3 miles respectively 5 kilometers.
By car or train, the actual journey to Amersham on the Hill is certainly longer, as only the direct route (as the crow flies) between Chalfont St Giles and Amersham on the Hill has been calculated here.
Air line (approximately)
5 kilometers
3 nautical miles