Tynes redeemed himself with the game winner, after missing a 36-yard attempt as time expired in the fourth quarter of a game played in frigid temperatures at historic Lambeau Field. He also kicked two other field goals in the win.
Eli Manning completed 21 of 40 passes for 255 yards for New York (13-6), who will play the New England Patriots in Super Bowl XLII Feb. 3 in Glendale, Ariz.
Brett Favre went 19 of 35 passing for 236 yards, two touchdowns and two interceptions for the Packers (14-4), who were trying to win their first conference title in 11 years.
Donald Driver had five receptions for 141 yards and a score.