The calculated distance (air line) between Phnom Penh and Biên Hòa is approximately 136 miles respectively 219 kilometers.
By car or train, the actual journey to Biên Hòa is certainly longer, as only the direct route (as the crow flies) between Phnom Penh and Biên Hòa has been calculated here.
Air line (approximately)
219 kilometers
118 nautical miles