The calculated distance (air line) between San Marcos Huixtoco and Coyoacán is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Coyoacán is certainly longer, as only the direct route (as the crow flies) between San Marcos Huixtoco and Coyoacán has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles