Operated by SBST
| Direction | First bus (wkday) | Last bus | AM peak | AM off-peak | PM peak | PM off-peak |
|---|---|---|---|---|---|---|
| Hougang Ctrl Int → Opp Blk 321 | 17:38 | 19:13 | — | — | 12–15 min | — |
First/last bus are at the origin stop, weekdays. Frequencies are LTA's scheduled ranges in minutes.