"We've been consistent whether we are home or on the road," Jackson said. "We play with an edge, we play with a belief, and now our job is just to chalk them up in the win column. Mission accomplished tonight."
Philadelphia (14-16), making its third stop on an eight-game road trip, made it difficult but came up short two days after beating Memphis 99-89.
Thaddeus Young had 19 points and 10 assists for the Sixers while reserve Nick Young had 13 points.
The Warriors led after one following Jack's off-balance 12-footer off the glass with 2.6 seconds left.
Jack later had some fun after Wright lost his left shoe in the second quarter. Jack picked up the shoe and tossed it into the crowd behind the backboard, then raced down the court and made a 3-pointer to give the Warriors a 41-34 lead. Sixers coach Doug Collins had to call timeout to allow Wright to retrieve his shoe.
"I know the rule is that's not a penalty but I think as a league we need to revisit that," Collins said. "There shouldn't be anything thrown in the stands. If you throw a ball in the stands, you're thrown out of the game. It was a shoe and (then) a 3, sort of a double-whammy."
Jack and Landry, who have provided a boost off the bench for Golden State, combined for 25 points in the first half and the Warriors closed on a 16-4 run to lead 57-42.
Philadelphia pulled to 59-47 early in the third but Lee scored four straight then fed Harrison Barnes with a no-look pass from atop the key for an easy layup to put Golden State up by 18.
Young provided one of the few highlights for the Sixers when he jumped from just inside the free throw line and made a soaring one-handed dunk.
Klay Thompson scored 14 points for the Warriors while Stephen Curry had 11 points, six assists and five rebounds.
NOTES: Golden State improved to 12-2 against the Eastern Conference. ... Richardson was sidelined because of a sore back. ... Philadelphia's Spencer Hawes, coming off a season-high 20 points in the win over Memphis, had two points and was charged with a technical foul early in the second quarter. ... Oakland Raiders wide receiver Darrius Heyward-Bey was among those in attendance.