According to officials, a technical malfunction was the likely cause.
Kaliningrad is a Russian exclave on the Baltic Sea, positioned between NATO member states Poland and Lithuania.
The Su-30 fighter jet has been used extensively during Russia’s action in Ukraine.
The Russian air force has suffered a string of crashes that some observers have attributed to a higher number of flights amid the fighting in Ukraine. Last month, two Russian fighter jets crashed while on training missions – one into the Pacific and one into the Sea of Azov.