When have the minnesota vikings been in the super bowl?
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In what years have the Minnesota Vikings been in the super bowl?
1970, 1974, 1975, and 1977
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Which Super Bowls have the Minnesota Vikings been in?
IV, VIII, IX, and XI
List of Super Bowl champions
https://en.wikipedia.org/wiki/List%20of%20Super%20Bowl%20champions
List of Minnesota Vikings seasons
https://en.wikipedia.org/wiki/List%20of%20Minnesota%20Vikings%20seasons
The franchise has been conference champions three times since the merger, but has never won the Super Bowl. 
List of Minnesota Vikings seasons
Super Bowl IV, the fourth and final AFL–NFL World Championship Game in professional American football, was played on January 11, 1970
Super Bowl IV
Super Bowl VIII was played on January 13, 1974.
Super Bowl VIII
Super Bowl IX  was played on January 12, 1975.
Super Bowl IX
Super Bowl XI was played on January 9, 1977, at the Rose Bowl.
Super Bowl XI
The Minnesota Vikings have appeared in Super Bowls  IV, VIII, IX, and XI. Those four games were played on 1970, 1974, 1975, and 1977. The team has never won the Super Bowl.