|| Ron Schueler (8–14) || None || 45,181 || 66–69 |- style="background:#fbb" | 136 || September 3 || @ Pirates || 2–8 || Jim Rooker (11–10) || Wayne Twitchell (6–8) || None || 8,168 || 66–70 |- style="background:#bfb" | 137 || September 5 || @ Cubs || 6–5 (11) || Ron Schueler (9–14) || Dave LaRoche (3–4) || Larry Christenson (1) || 1,943 || 67–70 |- style="background:#bfb" | 138 || September 6 || @ Cubs || 4–3 || Dick Ruthven (8–11) || Burt Hooton (4–11) || None || 2,104 || 68–70 |- style="background:#fbb" | 139 || September 7 || @ Cubs || 0–3 || Bill Bonham (11–18) || Steve Carlton (14–11) || None || 10,632 || 68–71 |- style="background:#bfb" | 140 || September 8 || @ Cubs || 11–10 || Gene Garber (3–2) || Tom Dettore (1–3) || None || 14,564 || 69–71 |- style="background:#bfb" | 141 || September 9 || @ Cardinals || 2–0 || Jim Lonborg (15–11) || John Curtis (8–13) || None || 27,801 || 70–71 |- style="background:#bfb" | 142 || September 10 || @ Cardinals || 8–2 || Dick Ruthven (9–11) || Alan Foster (7–10) || None || 27,285 || 71–71 |- style="background:#bfb" | 143 || September 11 || Pirates || 8–5 || Ron Schueler (10–14) || Ramón Hernández (2–2) || None || 21,117 || 72–71 |- style="background:#bfb" | 144 || September 12 || Pirates || 6–4 || Gene Garber (4–2) || Bruce Kison (7–8) || None || 22,135 || 73–71 |- style="background:#fbb" | 145 || September 13 || Cardinals || 3–7 (17) || Ray Bare (1–2) || Jesús Hernáiz (2–3) || None || 35,290 || 73–72 |- style="background:#fbb" | 146 || September 14 || Cardinals || 2–9 || John Curtis (9–13) || Dick Ruthven (9–12) || None || 40,426 || 73–73 |- style="background:#fbb" | 147 || September 15 || Cardinals || 1–3 || Bob Forsch (5–4) || Steve Carlton (14–12) || Al Hrabosky (9) || 30,142 || 73–74 |- style="background:#fbb" | 148 || September 17 || Cubs || 2–4 || Tom Dettore (2–4) || Wayne Twitchell (6–9) || Dave LaRoche (4) || 10,152 || 73–75 |- style="background:#fbb" | 149 || September 18 || Cubs || 2–5 || Steve Stone (8–5) || Jim Lonborg (15–12) || Ken Frailing (1) || 8,133 || 73–76 |- style="background:#fbb" | 150 || September 19 || Cubs || 4–7 || Burt Hooton (6–11) || Ron Schueler (10–15) || Dave LaRoche (5)