Dhaka: India's emphatic victory was set-up by fast bowler Avesh Kumar, who claimed three wickets for 34 runs. Pant's 50 off 18 balls is the fastest recorded half-century in the history of under-19 internationals.
The Rahul Dravid-coached India topped Group D with an all-win record and now faces the second-placed team from Group A - Bangladesh or Namibia - in the Super League quarter-final in Fatullah on 6 February.
Qualifier Nepal, which knocked out defending champion South Africa from the Super League, awaits the winner of Tuesday's clash between Bangladesh and Namibia in the quarter-final in Mirpur on 5 February.
Pakistan and Sri Lanka, which have already qualified for the Super League quarter-finals, face-off in Mirpur on Wednesday to determine the group winner.
Teams, which do not make the Super League, will feature in the eight-nation Plate championships.
Afghanistan beat Canada by four wickets in Sylhet
Canada - 147 (Muslim Musa 3-31, Shamsurrahman Wali 3-21)
Afghanistan - 149 for 6 (Tariq Stanikzai 56, Miraj Patel 3-17)
India beat Nepal by seven wickets in Mirpur
Nepal - 169 for 8 (Avesh Khan 3-34, Dagar 2-32, Sundar 2-20)
India - 175 for 3 (Pant 78, Kishan 52)
New Zealand beat Ireland by four wickets in Fatullah
Ireland - 212 (Tector 56, Ravindra 3-36, Finnie 3-20)
New Zealand - 213 for 6 (Allen 97, Phillips 58, Anders 4-32)
Super League quarter-finals line-up:
Plate Championship quarter-finals line-up: