The NFL teams have finished the season with eighteen wins and one loss:
the 1984 San Francisco 49ers, who beat the Miami Dolphins 38-16 in Super Bowl XIX
the 1985 Chicago Bears, who beat the New England Patriots 46-10 in Super Bowl XX
the 2007 New England Patriots, who completed a "perfect regular season" and won their divisional and conference playoffs, before losing Super Bowl XLII to the New York Giants 17-21.