After winning Saturday's feature race, Gasly opened up a 12 point buffer over Antonio Giovinazzi heading into the final race.
The second of the Prema team cars had a poor start dropping to sixth where he stayed for the remainder of the race.
In the end, Gasly came home in ninth to secure the championship by eight points.
Kiwi Mitch Evans put in a strong performance in the final race of the year to finish eighth.
Charles Leclerc was crowned GP3 Champion despite failing to finish the final race of the season.
His closest title rival, Alexander Albon did everything in his power to take the win – scoring the four points for pole position before leading the early stages of the title-decider prior to a Safety Car intervention.
With Albon's advantage negated, Jack Aitken took the fight to the English/Thai racer. The duo eventually collided whilst battling for the race lead, ending Albon's championship hopes.
He brandished the move by Ferrucci as ‘stupid', but it failed to dampen his title victory.
FIA World Rallycross
Andreas Bakkerud won the final round of the World Rallycross Championship in Argentina.
Pole-sitter Bakkerud headed Johan Kristoffersson into the first turn – who earned his front row start by virtue of winning the other semi-final.
Bakkerud and Kristoffersson were having a spirited battle up the front of the pack and although battling with each other, were able to pull clear of the field.
Toomas Heikkinen made short work of the field to cross the line in third position after starting from the back of the grid.
Newly corned champion Mattias Ekstrom didn't have the rub of the green and dropped to fifth after being passed by DTM star, Timo Scheider.
However, the Swede's EKS squad claimed the Team's Championship after Timmy Hansen in the Peugeot-Hansen machine missed out on the semi-finals.
World Touring Car Championship
Gabriele Tarquini and Mehdi Bennani shared the spoils in the final round of the World Touring Car Championship held under lights in Qatar.
Former F1 driver, Tarquini handed Lada its final win before seeing off its WTCC program.
He brought his bright yellow car home in front of Tom Chilton and another Brit, Rob Huff.
In the second race, Moroccan, Bennani backed up his first ever pole position to come home with his third career win – his second this season for Sebastien Loeb Racing Citroen.
Former Supercars driver, Robert Dahlgren didn't have the best finish to his season, grinding his Volvo to a halt after a collision with Chilton late in the race.
Tiago Monteiro came out on top of a race long battle to secure third in the championship with fifth in the final heat.
His Honda team had to work overtime to get the car on the grid after a monster shunt in the opening race.
Four-time world champion Yvan Muller bowed out of the series by finishing fourth and sixth for Citroen in the two races.