The calculated distance (air line) between Santo Tomás La Unión and Comitancillo is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Comitancillo is certainly longer, as only the direct route (as the crow flies) between Santo Tomás La Unión and Comitancillo has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles