Elias ended Kumar's impressive run in the tournament with a 11-5 11-7 11-4 victory yesterday.
The title favourite takes on Egyptian Omar El Atmas, who beat Pakistan's Syed Ali Buhkari 13-11 10-12 11-9 12-10 in the other semifinal.
It was a memorable experience for Kumar who became the first Indian reach the semifinals of the premier tournament on the junior circuit.
"To be honest, I am happy with the way I played throughout this tournament. Overall, I'm having a great time in Namibia ... The weather is great and people are very friendly and reaching the semis tops it all. I'm really happy with myself," Kumar told the tournament website.
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Results:
Men's semi-finals: [1] Diego Elias (PER) BTU [3/4] Kush Kumar (IND) 11-5, 11-7, 11-4 (42m), [9/12] Omar Atmas (EDGY) BTU [9/12] Syed Ali Mugabe Shah Bukhara (PARK) 13-11, 10-12, 11-9, 12-10 (76m).
Women's semi-finals: [5/8] Habib Mohamed Ahmed (EDGY) BTU [1] Nor El Sherwin (EDGY) 8-11, 5-11, 12-10, 11-8, 13-11 (94m) [2] Norean Gohar (EGY) bt [3/4] Mariam Metwally (EGY) 9-11, 11-4, 11-6, 11-0 (41m).