- 4 missing buses.
- 1 Service 53 bus will perform one (1) down-route trip as Service 53 from Loyang Avenue (Bus Stop 98011 - Blk 149A) towards Bishan Interchange before Weekends & Public Holidays AM Peak, departing at 0600 hours.
- 1 Service 53 bus will perform one (1) down-route trip as Service 53 from Pasir Ris Drive 12 (Bus Stop 77339 - Opp Blk 756) towards Bishan Interchange via Changi Airport Terminal 2 before Weekends & Public Holidays, departing at 0525 hours.
- 1 Service 53 bus will perform one (1) down-route trip as Service 53 from Serangoon Central (Bus Stop 66379 - Blk 206) towards Bishan Interchange via Changi Airport Terminal 2 before Weekdays AM Peak, departing at 0535 hours.
- 2 Service 53 buses will perform one (1) down-route trip as Service 53 from Serangoon Central (Bus Stop 66379 - Blk 206) towards Bishan Interchange via Changi Airport Terminal 2 before Weekends & Public Holidays AM Peak.
- Saturdays: Departing at 0535 hours & 0541 hours.
- Sundays & Public Holidays: Departing at 0535 hours & 0551 hours.
- 2 Service 53 buses will perform one (1) down-route trip as Service 53 from Tampines Road (Bus Stop 64201 - Aft Hougang Ave 3) towards Bishan Interchange via Changi Airport Terminal 2 Terminal before Weekends & Public Holidays AM Peak.
- Saturdays: Departing at 0530 hours & 0540 hours.
- Sundays & Public Holidays: Departing at 0530 hours & 0539 hours.
- 2 Service 53 buses will perform one (1) down-route trip as Service 53 from Tampines Road (Bus Stop 64209 - Aft Defu Ave 1) towards Bishan Interchange before Weekdays, Sundays & Public Holidays AM Peak.
- Weekdays: Departing at 0535 hours & 0544 hours.
- Sundays & Public Holidays: Departing at 0555 hours & 0608 hours.
- 2 Service 53 buses will perform one (1) supplementary trip as Short Trip 53A during Weekdays AM Peak.
- 3 Service 53 buses will perform one (1) down-route trip as Service 53 from Pasir Ris Drive 12 (Bus Stop 77339 - Opp Blk 756) towards Bishan Interchange via Changi Airport Terminal 2 before & during Weekdays AM Peak, departing at 0520 hours, 0623 hours & 0651 hours.
- 3 Service 53 buses will perform one (1) down-route trip as Service 53 from Tampines Road (Bus Stop 64201 - Aft Hougang Ave 3) towards Bishan Interchange via Changi Airport Terminal 2 before Weekdays AM Peak, departing at 0520 hours, 0530 hours & 0540 hours.
- 3 Service 53 buses will perform one (1) down-route trip as Service 53 from Tampines Road (Bus Stop 64209 - Aft Defu Ave 1) towards Bishan Interchange before Saturdays AM Peak, departing at 0535 hours, 0551 hours & 0607 hours.
- 5 Service 53 buses will perform one (1) down-route trip as Service 53 from Loyang Avenue (Bus Stop 98011 - Blk 149A) towards Bishan Interchange before Weekdays AM Peak, departing at 0530 hours, 0540 hours, 0550 hours, 0600 hours & 0626 hours respectively.
- Several Service 53 buses will perform down-route trips as Service 53 from Terminal 3 Basement (Bus Stop 95109 - Changi Airport Ter 3) towards Bishan Interchange via Changi Airport Terminal 2 during Fridays, Weekends & Public Holidays PM Off-Peak.
- Fridays: Departing between 2145 hours & 2324 hours.
- Saturdays: Departing between 1914 hours & 2325 hours.
- Sundays & Public Holidays: Departing between 1923 hours & 2328 hours.
- This service practises jumpbus on Weekdays.
- Mondays-Thursdays: 18A-20P / 10S / 3E / 2T (33 buses)
- Fridays: 19A-21P / 9S / 2E / 2T (33 buses)
- Saturdays: 15A-21P / 1E (22 buses)
- Sundays & Public Holidays: 19A-21P / 1S / 1E / 1T (24 buses)
- Special Weekdays: 21A-16P / 4S / 1E (26 buses)
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