The Sonics' all-time regular-season record is 1,745-1,585. They won the NBA championship in 1979 and lost in the NBA...

Sonics year by year
The Sonics’ all-time regular-season record is 1,745-1,585. They won the NBA championship in 1979 and lost in the NBA Finals in 1978 and 1996.
Year W-L Pct. Coach Leading scorer Playoffs
1967-68 23-59 .280 Al Bianchi Walt Hazzard, 23.9 None
1968-69 30-52 .366 Bianchi Bob Rule, 24.0 None
1969-70 36-46 .439 Lenny Wilkens Rule, 24.6 None
1970-71 38-44 .463 Wilkens Spencer Haywood, 20.6 None
1971-72 47-35 .573 Wilkens Haywood, 26.2 None
1972-73 26-56 .317 Tom Nissalke, Bucky Buckwalter Haywood, 29.2 None
1973-74 36-46 .439 Bill Russell Haywood, 23.5 None
1974-75 43-39 .524 Russell Haywood, 22.4 Lost to Golden State in conference semifinals
1975-76 43-39 .524 Russell Fred Brown, 23.1 Lost to Phoenix in first round
1976-77 40-42 .488 Russell Brown, 17.2 None
1977-78 47-35 .573 Bob Hopkins, Wilkens Gus Williams, 18.1 Lost to Washington in NBA Finals
1978-79 52-30 .634 Wilkens Williams, 19.2 Beat Washington to win NBA title
1979-80 56-26 .683 Wilkens Williams, 22.1 Lost to Lakers in conference finals
1980-81 34-48 .415 Wilkens Jack Sikma, 18.7 None
1981-82 52-30 .634 Wilkens Williams, 23.4 Lost to San Antonio in conference finals
1982-83 48-34 .585 Wilkens Williams, 20.0 Lost to Portland in first round
1983-84 42-40 .512 Wilkens Sikma, 19.1 Lost to Dallas in first round
1984-85 31-51 .378 Wilkens Tom Chambers, 21.5 None
1985-86 31-51 .378 Bernie Bickerstaff Chambers, 18.5 None
1986-87 39-43 .476 Bickerstaff Dale Ellis, 24.9 Lost to Lakers in conference finals
1987-88 44-38 .536 Bickerstaff Ellis, 25.8 Lost to Denver in first round
1988-89 47-35 .573 Bickerstaff Ellis, 27.5 Lost to Lakers in conference semifinals
1989-90 41-41 .500 Bickerstaff Ellis, 23.5 None
1990-91 41-41 .500 K.C. Jones Xavier McDaniel, 21.8 Lost to Portland in first round
1991-92 47-35 .573 Jones, George Karl Ricky Pierce, 21.7 Lost to Utah in conference semifinals
1992-93 55-27 .671 Karl Pierce, 18.2 Lost to Phoenix in conference finals
1993-94 63-19 .768 Karl Shawn Kemp, 18.1 Lost to Denver in first round
1994-95 57-25 .695 Karl Gary Payton, 20.6 Lost to Lakers in first round
1995-96 64-18 .780 Karl Kemp, 19.6 Lost to Chicago in NBA Finals
1996-97 57-25 .695 Karl Payton, 21.8 Lost to Houston in conference semifinals
1997-98 61-21 .744 Karl Vin Baker, 19.2 Lost to Lakers in conference semifinals
1998-99 25-25 .500 Paul Westphal Payton, 21.7 None
1999-2000 45-37 .549 Westphal Payton, 24.2 Lost to Utah in first round
2000-01 44-38 .536 Westphal, Nate McMillan Payton, 23.1 None
2001-02 45-37 .549 McMillan Payton, 22.1 Lost to San Antonio in first round
2002-03 40-42 .488 McMillan Ray Allen, 24.5 None
2003-04 37-45 .451 McMillan Allen, 23.0 None
2004-05 52-30 .634 McMillan Allen, 23.9 Lost to San Antonio in conference semifinals
2005-06 35-47 .427 Bob Weiss, Bob Hill Allen, 25.1 None
2006-07 31-51 .378 Hill Allen, 26.4 None
2007-08 20-62 .244 P.J. Carlesimo Kevin Durant, 20.3 None
Game highs
Points 58 Fred Brown March 23, 1974 at Golden State
Rebounds 30 Jim Fox Dec. 26, 1973 vs. Lakers
Assists 25 Nate McMillan Feb. 23, 1987 vs. Clippers