Lynn set the fastest GT lap of the race as the #97 Aston Martin Vantage he shared with regular FIA World Endurance Championship teammate Maxime Martin and Harry Tincknell had a faultless run to claim Aston's first win at Le Mans since 2017.
The #97 car led for 189 laps of the 346 lap-distance and beat the #51 Ferrari of James Calado, Alessandro Pier Guidi and Daniel Serra by 1m33s to move into second in the WEC GTE Pro drivers' championship with one round to go in Bahrain.
#97 Aston Martin Racing Aston Martin Vantage AMR: Alex Lynn, Maxime Martin, Harry Tincknell
Sam Bloxham / Motorsport Images
After making his first start with Aston Martin, Tincknell said that he knew the Vantage GTE would be a force to be reckoned with from his time battling the British marque at Le Mans in the past two years as a Ford driver.
"High-speed corners, downforce corners we were really strong, it was very impressive but I knew it was going to be the case having followed it through the Porsche Curves in the past," said Tincknell. "And I think raceability was really strong.
"From that side it made battling slightly easier than what I’ve been used to in the past."
Lynn's fastest lap of 3m50.321s was also 0.553s quicker than the time Porsche driver Gianmaria Bruni set to take pole in Friday's Hyperpole session.
Asked by Motorsport.com if his best lap had shown how much pace Aston had in reserve, Lynn said: "I said to Tincks after the race, ‘mate, you should have driven it the last two years’.
"The car has come such a long way and in the end, we had the same Balance of Performance as we had last year before qualifying and even then, we wouldn’t have been able to win with what we had last year."