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The San Francisco 49ers.
The Broncos, Vikings, and Bills have all lost four Super Bowls. The Bills and the Vikings have never won the Super Bowl.
redskins
Kansas City Chiefs were the fist team to lose a Super Bowl.
The Minnesota Vikings lost to the Dolphins in Super Bowl VIII, the Steelers in Super Bowl IX, and the Raiders in Super Bowl XI.
Although the Lions had a rich and successful history pre-Super Bowl era, the Lions have never played in a Super Bowl. The Detroit Lions are the only team in the NFC and the only non-expansion team to never have played in a Super Bowl.
Not yet. Harbaugh, whose San Francisco 49ers team lost to the Baltimore Ravens in Super Bowl XLVII in New Orleans, has never won a Super Bowl as a player or head coach.
No National Football League team has ever lost the Super Bowl seven times. The record for most Super Bowl losses is five, held by the Denver Broncos. They have won twice.
Through Super Bowl XLII, that is 31 points by the Dallas Cowboys who lost Super Bowl XIII to the Pittsburgh Steelers, 35-31.
The Patriots lost to the Giants 17-14.
Miami dolphins
The Kansas City Chiefs lost the first Super Bowl to the Green Bay Packers 35-10.