The calculated distance (air line) between Güimar and San Sebastián de la Gomera is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to San Sebastián de la Gomera is certainly longer, as only the direct route (as the crow flies) between Güimar and San Sebastián de la Gomera has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles