The Islanders have been on both sides of blown leads and found themselves on the wrong side again Tuesday night against the Flyers — until the game’s final 41 seconds.

Despite a dominant first-period performance in which the Islanders emerged with a commanding three-goal advantage, the Flyers rallied with a two-goal second period and tied the game with 93 seconds left in the third.

But the Islanders prevailed, with Ryan Pulock notching a goal with 41 seconds left in regulation to take a 5-3 win and extend their point streak at Barclays Center to 15 games, dating back to last season, and improving to 7-0-3 in Brooklyn this season.

“The biggest thing for me is that no matter how the game is going, we’re just staying with the process,” head coach Barry Trotz said after the win. “There’s no panic on our bench. I think we’ve seen that in the last little while. We’ve responded in the right times and tonight we did again.”

The Islanders couldn’t build off of their first period, allowing Philadelphia to have its way in the second. Going on the power play at 14:34 of the second when Kevin Hayes was sent off for tripping, the Islanders watched as the Flyers had the best opportunity of the stretch, as winger Michael Raffl nearly scored on a shorthanded breakaway.

But the Islanders’ strong start and ability to keep their heads at the end of the third enabled them to pick up a much-needed win before their upcoming four-game road trip out west.

“That was huge obviously,” Pulock said of preventing the Flyers from stealing a valuable point in the standings. “Them getting the late goal there to tie it up and then finding a way to get it done and not give them those points, could be very big at the end of the year.”

It wasn’t all good news for the Islanders, who lost a key player in the first period when Casey Cizikas collided with Ivan Provorov in the corner and went down hard. He had to be helped off the ice, unable to put any weight on his left leg and did not return.

The Islanders’ first line set the tone early, buzzing from the initial puck drop and generating a handful of shots in the opening minutes. Josh Bailey finished what they started, one-timing the puck from the slot before it was deflected off a Philly stick and in for a 1-0 lead at 7:45 of the first. It was his fifth point in the past five games.

A well-executed two-on-one between Matt Martin and Leo Komarov, which led to Martin netting his fifth goal of the season, put the Islanders up 2-0 at 11:13. But the Isles weren’t done as Jordan Eberle cleaned up a rebound at 15:36 after a shot from Mathew Barzal was stopped by goaltender Brian Elliott.

At that point, the Islanders had three goals on just nine shots.

The Flyers got on the board at 9:34 of the second on a goal by Travis Konecny. Roughly 2 ¹/₂ minutes later, Robert Hagg capitalized on a rebound to make it a one-goal game with just over eight minutes left in the middle frame.

Sean Couturier knotted the game 3-3 with 93 seconds left in regulation, before Pulock saved the day. Leo Komarov sealed the deal with an empty-netter.

“There’s lots of stretches of hockey that we’ve been playing pretty well,” Trotz said. “You’re not going to get a complete game every night, the league is too hard. And the teams are so close. So you’re going to have to weather storms and [in] the second period we weathered a storm.

“We weathered a storm at the end of the game and they didn’t weather ours at the end.”