Operated by SBST
| Direction | First bus (wkday) | Last bus | AM peak | AM off-peak | PM peak | PM off-peak |
|---|---|---|---|---|---|---|
| Toa Payoh Int → Boon Lay Int | 05:10 | 23:30 | 10–12 min | 8–13 min | 8–13 min | 11–15 min |
| Boon Lay Int → Toa Payoh Int | 05:30 | 24:00 | 7–12 min | 7–15 min | 10–11 min | 11–15 min |
First/last bus are at the origin stop, weekdays. Frequencies are LTA's scheduled ranges in minutes.