|| 78–67 |- style="background:#fbb" | 146 || September 13 || @ Giants || 2–7 || Juan Marichal (22–6) || Larry Jackson (14–14) || None || 11,930 || 78–68 |- style="background:#bfb" | 147 || September 14 || @ Giants || 2–0 || Jim Bunning (17–11) || Gaylord Perry (20–7) || None || 8,328 || 79–68 |- style="background:#fbb" | 148 || September 16 || @ Astros || 4–6 || Mike Cuellar (11–9) || Chris Short (18–9) || None || 10,920 || 79–69 |- style="background:#fbb" | 149 || September 17 || @ Astros || 2–11 || Larry Dierker (9–7) || John Morris (1–1) || None || 10,291 || 79–70 |- style="background:#bfb" | 150 || September 18 || @ Dodgers || 4–0 || Larry Jackson (15–14) || Claude Osteen (16–12) || None || 36,183 || 80–70 |- style="background:#fbb" | 151 || September 19 || @ Dodgers || 1–6 || Don Drysdale (11–16) || Jim Bunning (17–12) || None || 24,900 || 80–71 |- style="background:#fbb" | 152 || September 20 || @ Dodgers || 1–11 || Sandy Koufax (25–8) || Chris Short (18–10) || None || 41,726 || 80–72 |- style="background:#bfb" | 153 || September 21 || @ Dodgers || 3–2 || Rick Wise (5–6) || Claude Osteen (16–13) || None || 35,770 || 81–72 |- style="background:#bfb" | 154 || September 23 || Cardinals || 5–4 (12) || Ray Culp (7–4) || Dick Hughes (1–1) || None || 6,896 || 82–72 |- style="background:#bfb" | 155 || September 24 || Cardinals || 5–4 || Jim Bunning (18–12) || Al Jackson (13–14) || None || 8,186 || 83–72 |- style="background:#bfb" | 156 || September 25 || Cardinals || 4–3 (13) || Bob Buhl (6–8) || Nelson Briles (4–15) || None || 4,628 || 84–72 |- style="background:#bfb" | 157 || September 26 || Pirates || 5–4 (11) || Jim Bunning (19–12) || Billy O'Dell (5–5) || None || 8,289 || 85–72 |- style="background:#bbb" | – || September 27 || Pirates || colspan=6 | Postponed (rain); Makeup: September 28 as a traditional double-header |- style="background:#fbb" | 158 || September 28 (1) || Pirates || 1–2 || Steve Blass (11–6) || Jim Bunning (19–13) || Tommie Sisk (1) || see 2nd game || 85–73 |- style="background:#fbb" | 159 || September 28 (2) || Pirates || 2–4 || Bob Veale (16–12) || Larry Jackson (15–15) || None || 7,213 || 85–74 |- style="background:#bfb" | 160 || September 30 || Dodgers ||