Down 25-24 at the break, Ohio opened the second half with a 23-12 run to take a 47-37 lead with 12:18 remaining. Northern Illinois then went nearly nine minutes without scoring, allowing the Bobcats to stretch their lead to 62-40 with 3:47 left.
Kellogg was 6 of 8 from the floor and hit four of five 3-pointers. Ndour made all four free throw attempts, and grabbed eight rebounds.
Ohio (13-4, 3-1 Mid-American) has won ten of its last 11 league road games, its best in program history.
Forward Kennedy Meeks, who has averaged 9.4 points and 6.5 rebounds at North Carolina, has pulled out of the NBA draft and will return to the Tar Heels.
Cal big man Ivan Rabb could have been selected in the top 10 of the NBA draft. Instead, he's returning to Berkeley to make himself, and the Golden Bears, stronger.
Devin Williams' decision last month to sign with an agent and enter the NBA draft has left West Virginia in a tough spot.