Hartley played for the Saints for six seasons (2008-2013). After a brilliant first season in which he made all 13 of his field goal attempts, he came through big in 2009. He booted four field goals in an overtime win at Washington to keep the Saints unbeaten. Hartley drilled a 40-yard field goal to kick the Saints into the Super Bowl, beating the Vikings 31-28 in overtime.
In Super Bowl XLIV, Hartley became the first kicker in Super Bowl history to kick three field goals of 40 yards or more as the Saints defeated the Indianapolis Colts 31-17.