The largest point-spread upsets in NFL history during the Super Bowl era are tied at 20 points — achieved three times.
On October 15, 1967, the Minnesota Vikings defeated the Green Bay Packers 10–7 at Lambeau Field as 20-point underdogs. The Vikings passed for just 25 yards but forced three turnovers.
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On September 29, 1968, the Buffalo Bills beat the New York Jets 37–35 as 20-point underdogs. Bills defenders intercepted five passes by Joe Namath — two returned for touchdowns.
On September 22, 1974, the San Diego Chargers edged the Cincinnati Bengals 20–17 as 20-point underdogs. Quarterback Dan Fouts scored the winning rushing touchdown in the fourth quarter.
Super Bowl III remains the largest upset in Super Bowl history: the New York Jets defeated the Baltimore Colts 16–7 on January 12, 1969, as 18-point underdogs. Joe Namath guaranteed the win beforehand.
Other notable large-margin upsets include Washington’s 24–14 win over Dallas on December 3, 1995, as 17.5-point underdogs; the Giants’ 27–21 win at Dallas on November 10, 1968, also as 17.5-point underdogs; the Cleveland Browns’ win over Baltimore on October 20, 1968, as 17.5-point underdogs; and the Denver Broncos’ 17–10 win at New England on November 6, 1966, as 17.5-point underdogs.
The biggest upset of the 2026 season occurred in Week 6, when the Arizona Cardinals beat the Los Angeles Rams as 13.5-point underdogs.
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