The Seattle Seahawks finished atop the NFC West with a 12–4 record and earned a first round bye and home-field advantage throughout the playoffs. They defeated the Carolina Panthers 31–17 in the NFC Divisional Round. On January 18, 2015, Maxwell recorded six combined tackles, deflected a pass, and intercepted a pass by Aaron Rodgers in the Seahawks' 28–22 overtime victory against the Green Bay Packers in the NFC Championship Game. On February 1, 2015, Maxwell started in Super Bowl XLIX and recorded five combined tackles during the Seahawks 28–24 loss to the New England Patriots.
On March 10, 2015, the Philadelphia Eagles signed Maxwell to a six-year, $63 million contract with $25 million guaranteed.
He started the Philadelphia Eagles' season-opener at the Atlanta Falcons and collected a season-high ten combined tackles and a pass deflection in their 26–24 loss. Maxwell was tasked with covering wide receiver Julio Jones in his Eagles' debut and allowed nine receptions and two touchdowns on 11 targets. His two touchdown receptions allowed were the only two he allowed throughout the season. In Week 7, he made five combined tackles, two pass deflections, and made his first interception as a member of the Philadelphia Eagles during a 27–16 loss at the Carolina Panthers. He missed the last two games (Weeks 16–17) of the regular season after sustaining a shoulder injury in Week 15 during a loss to the Arizona Cardinals. Maxwell finished the season with 64 combined tackles (53 solo), ten pass deflections, two forced fumbles, and two interceptions in 14 games and 14 starts. Maxwell earned an overall grade of 44.4 from Pro Football Focus and ranked 80th among all qualifying cornerbacks in 2015.