Operated by SBST
| Direction | First bus (wkday) | Last bus | AM peak | AM off-peak | PM peak | PM off-peak |
|---|---|---|---|---|---|---|
| Buangkok Int → Blk 991B | 06:30 | 00:35 | 14–15 min | — | 14–15 min | 13–22 min |
First/last bus are at the origin stop, weekdays. Frequencies are LTA's scheduled ranges in minutes.