Braden Holtby made 30 saves, finally giving up a goal to the Jets midway through the third period. He had blanked Winnipeg in each of their last two meetings, including a 4-0 victory Thursday.
Ovechkin gave Washington a 4-0 lead 7:35 into the second period and he delivered the Capitals' final goal on the power play with 4:02 to play in the third.
Washington now trails the first-place Jets by five points in the Southeast Division.
The lockout-shortened season has produced some strange scheduling in the NHL this year and that was the case with this game, in which Washington played a second straight night against the same team on the road. That had never happened before in the history of the Washington franchise.