Leclerc now looked locked in for victory, but there was great doubt over second place.
Hamilton, who earlier had a five-second penalty for moving before the lights went out at the start, was 20 seconds back from his team-mate, but Verstappen was closing in and Russell was going with the Dutchman, having dropped back with a pit stop on lap 34 forced by a slow puncture.
But on lap 48, Verstappen spun off at Stowe. Red Bull team principal Laurent Mekies said the rear wing did not close properly, meaning Verstappen had less downforce as he turned in, causing his loss of control.
Verstappen’s off brought out the safety car, and initially it looked as if there would be a short blast to the finish with the Ferrari drivers contesting victory on fresh tyres.
But Russell did not pit, so he would have taken any restart between them, which would have delayed Hamilton’s charge, even by a few seconds.
But Verstappen had crashed with only four laps to go, and there was doubt about whether the incident would be cleared in time.
As the cars came around to approach the start of the final lap, the timing screen initially said the safety car would pull in, but a few seconds later that message was replaced by another saying it would stay out.
The full post-race FIA statement said: “The safety-car period regulation states that one lap must be completed following the unlapping procedure.
“This process was followed by race operations. The ‘safety car in this lap’ message was displayed erroneously due to a software error.”
The safety-car finish guaranteed Leclerc’s first win since the 2024 US Grand Prix in Austin.
Russell’s podium was his first at his home race and he said: “Really pleased to be standing here, even though it was a very lucky race. I had the puncture but I was lucky to get the safety car at the end.”
Hamilton said: “I just didn’t have it today. I jumped the start, got a five-second penalty but Charles had the pace on me today. I struggled with the balance of the car. I gave it everything and I am grateful to be up here.”
Lando Norris took fourth for McLaren after a solid but quiet race as the world champions wait for upgrades due at the Hungarian Grand Prix this month.
Red Bull’s Isack Hadjar was fifth, followed by the Racing Bulls of Liam Lawson and 18-year-old British rookie Arvid Lindblad.
Norris’ team-mate Oscar Piastri dropped to the back after being involved in a first-lap incident and recovered to 11th, behind the Audi of Gabriel Bortoleto and Alpine’s Franco Colapinto and Pierre Gasly.