Willis made 4 of 7 from long range to total 20 points, Lynn had 17 points and seven assists and Coleman had 17 points and nine rebounds for NJIT (14-10).
The Highlanders, who have won nine of their last 10 games, raced to an early lead, were up 38-24 at the half and led 59-35 midway through the second half. Delaware State never challenged in the second period.
NJIT made 26 of 60 from the floor (43.3 percent) while limiting the Hornets to 19-of-59 shooting (32.2 percent). The Highlanders also had 21 assists, seven steals and six blocked shots.