On 20 August 2018, it was announced that Gasly would drive for Red Bull for the year 2019 season, partnering Max Verstappen following the departure of Daniel Ricciardo to Renault. He struggled with the RB15, being consistently off teammate Verstappen’s pace.
Gasly only out-qualified Verstappen on one occasion, in Canada, when Verstappen was hampered by a red flag in qualifying. In both China and Monaco, he recorded the fastest lap of the race. Gasly’s best result of the season came at the British Grand Prix, finishing 4th after Verstappen and Sebastian Vettel in front were involved in a collision.
He came under increasing pressure at the Hungarian Grand Prix, after being lapped by Verstappen during a race in which he could have assisted Verstappen from being passed by Lewis Hamilton for the race win, had Gasly been close enough behind.