The win meant Delhi are now unbeaten in their last five matches, winning three of them, while Bengaluru have lost three of their last five matches.
Matej Poplatnik scored a brace (23rd, 55th minutes) to put Kerala Blasters in the driving seat and young midfielder Sahal Abdul Samad finished things off in the 71st minute to score his first ever ISL goal.
Before this match, Mumbai had gone down 1-0 to Jamshedpur FC in an 'away' game and 2-0 to FC Goa in their previous home game.
Bengaluru FC have been dominant like last season, while defending champions Chennaiyin have been in woeful form, to say the least.
The result sees Bengaluru extend their lead atop the ISL table to four points, while Kerala Blasters remain winless in 14 matches and are rooted to the ninth spot.
FC Goa added a point to their tally to make it 25 points from 14 matches and remain third in the standings while Delhi are rooted to the eighth spot.
Edu Bedia and star striker Ferran Corominas struck on either side of the break at the Mumbai Football Arena to help FC Goa beat Mumbai City FC 2-0.
The three points helped Delhi Dynamos climb above Kerala Blasters to the eighth spot in the ISL standings, courtesy of a head-to-head advantage.
Chencho smashed the second goal for Bengaluru in 71st minute after United striker Federico Gallego got the equaliser in the 60th minute.
Mumbai and Bengaluru are on top of the league table with 27 points each, though Mumbai have played 13 matches, one more than the visitors.
Edu Garcia's free-kick in the 85th minute gave ATK an unexpected lead but a Matej Poplatnik goal just three minutes later saw the spoils shared.
Pritam Kotal represented Dynamos 24 times in the tournament, scoring a goal each in both the seasons.
Bengaluru FC are the only team who are unbeaten so far, although they have only played six matches.
Brazilian defender Vieira scored the winner in the 82nd minute to hand the Stallions their fifth loss from seven matches.
Bengaluru broke the Kerala hearts with nine minutes to go. Xisco released Miku into the box and the latter's return was sent goalwards by the Spaniard.
Last season when Bengaluru FC came to Kochi on the eve of New Year, they thumped three goals in what was Rene Meulensteen's final game in charge.
ATK suffered an injury blow to their key forward Kalu Uche in the first-half as they looked desperate to firm up their attacking prowess.
The visitors had several opportunities to score the equalizer as they won several free headers inside the Goa box but just could not test Nawaz.
Dynamos head into the game following a two-week break due to international fixtures but defender Rana Gharami believes that a long gap has allowed his team to prepare well for this game.
ISL claimed that Gaurav Mukhi, at 16, was the youngest ever to score in the tournament's history when he scored against Bengaluru FC, the debate over the forward's age began instantly, thanks to his moustache and well-built physique.
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