BOSTON — If the Bruins really want to be taken seriously, they will have to prove themselves to be a harder out away from TD Garden.

But on Causeway Street, they are about as good as anyone.

In their last home game until Feb. 26, the B’s beat the Philadelphia Flyers, 6-3, on Thursday to sweep all nine home games in January and improve their home record to 21-8-1.

Fraser Minten and Casey Mittelstadt led the way with three-point nights (1-2-3 totals each) and Jeremy Swayman made 33 saves.

The only blemish on the night was the loss of Pavel Zacha to an upper body injury, leaving the game with 6:55 left in the second period. His prognosis was not immediately known.

The B’s will end their pre-Olympic portion of the schedule with two tough road games, the Stadium Series tilt against the Tampa Bay Lightning at Raymond James Stadium on Sunday and then finish up with a game against the surging defending Stanley Cup champion Florida Panthers next Wednesday.

The B’s took an early 2-0 lead with two goals in 41 seconds midway through the first period.

The Bruins were already missing No. 1 centerman Elias Lindholm (upper body) and the absence was noticeable when the B’s got the first power play of the game. The fourth-ranked PP looked disjointed and the advantage went by without so much as a scoring chance.

But the B’s eventually got on the board on back-to-back shifts.

The first one came from the new second line with Minten taking Zacha’s spot between Viktor Arvidsson and Mittelstadt, which had been the B’s most constant line. At 9:49, Arvidsson notched his 13th of the season when his one-timer off a Mittelstadt feed sneaked under goalie Samuel Ersson’s pads.

Then on the next shift, Zacha notched his 15th of the year when he took a quick feed from Morgan Geekie and went upstairs to beat Ersson, snapping a seven-game goal-less skid.

It appeared as though the Flyers had cut their deficit shortly after that. Chistian Dvorak picked off a Jonathan Aspirot pass in the neutral zone and the Flyers immediately went on the attack. Swayman stopped the clean break-in from Nikita Grebenkin but Dvorak scored on the rebound.

But after coach Marco Sturm’s challenged for goalie interference, it was ruled that Grebenkin, who had his stick in between Swayman’s glove arm and body, impeded Swayman and the goal came off the board.

The B’s took a 3-0 lead at 2:27 of the second but then handed a goal right back.

First, Minten scored off the rush, benefiting from an Ersson softy when his wrister slipped under the goalie’s pads once again for the rookie’s 14th goal.

Less than a minute later, however, Sean Kuraly served up a pizza to Travis Konecny all alone in the slot. He had time and space and he wasn’t going to miss, beating Swayman under the glove.

At that point, the game was up and down with nary a whistle. Philly was starting to spend more time in the B’s zone while Ersson had made a couple of good saves at the other end to keep the Flyers within striking distance.

But the B’s new second line picked up their third goal of the night at 16:12. After some excellent pressure, Ersson made a good stop on Andrew Peeke on a backdoor play, but Mittelstadt swooped in to lift a backhander into the top shelf to make it 4-1, his 11th .

Just 2:28 later, Tanner Jeannot made it 5-1 with his sixth when he got in the way off a Peeke slapper and it beat Ersson.

Again, the B’s gave one back before the end of the period. Nikita Zadorov missed the net on a shot and it rimmed all the way around and out of the zone to give Konecny a clean breakaway. Swayman stopped Konecny but Grebenkin followed it up for the goal with 55 seconds left in the period.

The B’s cruised for the third period until Marat Khusnutdinov (12) scored an empty-netter with 3:30 left before Matvei Michkov scored a late PP goal.

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