The Malaysia Airlines 777 exploded over Ukraine on July 17, killing all 298 on board, 193 of them Dutch, with the West accusing Russian backed separatists of shooting it down.
Over 220 coffins have been flown back to the Netherlands, which is tasked with identifying the bodies.
Only two bodies had been identified so far, with the 21 new victims made up of 16 Dutch, including a dual British national, two Malaysians, a German, a Canadian and a Briton, the Dutch justice ministry said in a statement.
Following that decision, two planes carrying 142 police experts from the Netherlands, Australia and Malaysia are flying to the Netherlands today.