The calculated distance (air line) between San Bartolomé Milpas Altas and Cobán is approximately 63 miles respectively 102 kilometers.
By car or train, the actual journey to Cobán is certainly longer, as only the direct route (as the crow flies) between San Bartolomé Milpas Altas and Cobán has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles