Operated by SBST
| Direction | First bus (wkday) | Last bus | AM peak | AM off-peak | PM peak | PM off-peak |
|---|---|---|---|---|---|---|
| Serangoon Int → Yishun Int | 06:00 | 00:15 | 10–12 min | 9–14 min | 9–17 min | 15–17 min |
| Yishun Int → Serangoon Int | 06:00 | 24:00 | 10–12 min | 9–15 min | 8–12 min | 15–17 min |
First/last bus are at the origin stop, weekdays. Frequencies are LTA's scheduled ranges in minutes.