The calculated distance (air line) between Avignon and Saint-Martin-de-Crau is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Saint-Martin-de-Crau is certainly longer, as only the direct route (as the crow flies) between Avignon and Saint-Martin-de-Crau has been calculated here.
Air line (approximately)
34 kilometers
19 nautical miles