- | 6 Episodes

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1975 | 22 Episodes

Season 1 of Welcome Back, Kotter premiered on September 9, 1975.

1976 | 23 Episodes

Season 2 of Welcome Back, Kotter premiered on September 23, 1976.

1977 | 27 Episodes

Season 3 of Welcome Back, Kotter premiered on September 29, 1977.

1978 | 23 Episodes

Season 4 of Welcome Back, Kotter premiered on November 25, 1978.