Hubert started the race from pole position, after he was classified eighth in the Feature Race. The Frenchman finished Friday's race in ninth, but was promoted following Luca Ghiotto's disqualification.
While Deletraz was close behind the BWT Arden for much of the race, the final handful of laps saw Deletraz close right in onto Hubert, with the two having a drag race to the line, which saw Hubert come out on top.
Guanyu Zhou took his second podium of the season, as he watched the battle between Hubert and Deletraz unfold in front of him.
Dorian Boccolacci matched his best result of the season, crossing the line in fifth place, over ten seconds down on Markelov in front.
While one BWT Arden revelled in the Monaco streets, the other was eliminated from the race as Tatiana Calderon came together with Luca Ghiotto.
Ghiotto got away with the incident, but soon also found himself watching from the sideline when he collided with Mahaveer Raghunathan at the hairpin.
Bahrain International Circuit - Winter testing