It is the first time since the 1988 season that the Bengals will compete in the Super Bowl.
McPherson held his nerve to seal a brilliant road win for the underdog Bengals, who trailed 21-3 in the first half following three touchdown passes from Chiefs quarterback Patrick Mahomes at Arrowhead Stadium.
Quarterback Joe Burrow threw two touchdown passes as the Bengals scored 21 unanswered points to take a 24-21 lead, with the Chiefs unable to score a game-winning touchdown after reaching the Bengals’ four-yard line inside the final two minutes.
Harrison Butker’s 44-yard field goal sent the game into overtime and the Chiefs won the coin toss to get the ball first, meaning a touchdown would secure a third straight Super Bowl appearance without the Bengals having the chance to respond.
However, after two incomplete passes Mahomes was intercepted by safety Vonn Bell and the Bengals drove down the field to set up McPherson for the game winner from 31 yards.
The 18-point comeback equals the record in either an AFC or NFC Championship game, set by the Indianapolis Colts in 2006.
It is the first time since the 1988 season that the Bengals have reached the Super Bowl, where they will face either the San Francisco 49ers or the Los Angeles Rams.
The 49ers beat the Bengals 20-16 in Super Bowl XXIII.