From 1969 to 1972 with Seattle, and in his one season as a player with Portland, he was a player-coach. He retired from playing in 1975 and was the full-time coach of the Trail Blazers for one more season. After a season off from coaching, he again became coach of the SuperSonics when he replaced Bob Hopkins who was fired 22 games into the 1977–78 season after a dismal 5-17 start. The SuperSonics won 11 of their first 12 games under Wilkens and made the playoffs in back-to-back years, losing in seven games to the Washington Bullets in the 1978 NBA Finals before returning to the 1979 NBA Finals and defeating the Washington Bullets in five games for their first and only NBA title.