Through the 2007-08 season, the Supersonics have played in three NBA finals: 1978 - lost to the Washington Bullets
1979 - defeated the Washington Bullets
1996 - lost to the Chicago Bulls
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The Seattle Supersonics (1967-2008) won the NBA Championship in 1979 (1978-1979 season).
They defeated the Washington Bullets in 5 games in the championship series, ending June 1, 1979.
The SuperSonics won the NBA championship in 1979. Overall, the franchise won three Western Conference titles: 1978, 1979, and 1996.