The 2005 season, his first with the Giants after four years with the Falcons, has had both highs and lows. On October 30, Feely accounted for five field goals and three extra points in the Giants' emotional 36-0 win over the Washington Redskins, which was the first game following the death of Giants owner Wellington Mara. He has also had lows, most notably on November 27, when Feely missed three field goals, including two in overtime, during the Giants' 24-21 loss to the Seattle Seahawks. Any one of the three would have won the game for the Giants, who fell to 7-4 and into a tie in the NFC East. Though Feely profusely apologized to his teammates, the rest of the Giants felt that it was not his fault, implying that the Giants had other chances to win the game.

The Seahawks incident also led to a skit on Saturday Night Live on December 3, 2005, with host Dane Cook playing Feely in a fictional NFL Films movie called "The Long Flight Home: The Jay Feely Story".

In the following week against the rival Dallas Cowboys, Feely attempted to kick a field goal which would have put the Giants up by 10 with several minutes to play. However, the 34-yarder hit the left goal-post and bounced out. Despite the miss, the Giants hung on to defeat the Cowboys 17-10, and went on to take first place overall in the NFC East conference.

Two weeks after the Seattle debacle, Jay Feely had sweet redemption when he nailed a 36-yard field goal with 3:55 left in overtime to hand the Giants the win in Philadelphia against the division-rival Eagles, effectively knocking the Eagles, the reigning NFC Champion and the Giants' hated rivals, out of the 2006 playoffs. In addition to the game-winner, Feely added three field goals on three attempts, verifying his status as one of the premier kickers in the NFL.