The calculated distance (air line) between Rēzekne and Daugavgrīva is approximately 130 miles respectively 210 kilometers.
By car or train, the actual journey to Daugavgrīva is certainly longer, as only the direct route (as the crow flies) between Rēzekne and Daugavgrīva has been calculated here.
Air line (approximately)
210 kilometers
113 nautical miles