The San Francisco 49ers have lost one Super Bowl. They have played in six Super Bowls and won five.
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The San Francisco 49ers have gone to the Super Bowl five times, each appearance resulting in a victory. They appeared in Super Bowls in 1981 (XVI), 1984 (XIX), 1988 (XXIII), 1989 (XXIV) and 1994 (XXIX).
One, Super Bowl XIX against the San Francisco 49ers.
The Dallas Cowboys lost Super Bowl V to the Baltimore Colts and Super Bowls X and XIII to the Pittsburgh Steelers.
Through Super Bowl XLII, the Cowboys have not lost back to back Super Bowls. They lost Super Bowl V to the Baltimore Colts and Super Bowls X and XIII to the Pittsburgh Steelers.
Yes, the Buffalo Bills have lost four Super Bowls in which Jim Kelly was the quarterback.
Buffalo Bills