The calculated distance (air line) between Vilnius and Dainava (Kaunas) is approximately 55 miles respectively 88 kilometers.
By car or train, the actual journey to Dainava (Kaunas) is certainly longer, as only the direct route (as the crow flies) between Vilnius and Dainava (Kaunas) has been calculated here.
Air line (approximately)
88 kilometers
47 nautical miles