The calculated distance (air line) between Saulkrasti and Jēkabpils is approximately 76 miles respectively 122 kilometers.
By car or train, the actual journey to Jēkabpils is certainly longer, as only the direct route (as the crow flies) between Saulkrasti and Jēkabpils has been calculated here.
Air line (approximately)
122 kilometers
66 nautical miles