Operated by SMRT
| Direction | First bus (wkday) | Last bus | AM peak | AM off-peak | PM peak | PM off-peak |
|---|---|---|---|---|---|---|
| Gali Batu Ter → Bt Merah Int | 05:20 | 23:25 | 8–11 min | 10–15 min | 15 min | 14–15 min |
| Bt Merah Int → Opp Blk 635A | 06:15 | 23:45 | 11–14 min | 9–14 min | 8–11 min | 12–16 min |
First/last bus are at the origin stop, weekdays. Frequencies are LTA's scheduled ranges in minutes.