Bus Service 21

!	TRAVEL ADVISORY					!
	From Sunday, 14 November 2024 to 31 October 2025, Train services on the Bukit Panjang LRT will end an hour earlier at 22:30 every Thursday to Sunday (except Public Holidays). This is to facilitate the upgrading of the BPLRT signalling system, as well as the testing of the new and retrofitted Light Rail Vehicles (LRVs) on the BPLRT network. Please refer here for more information. From Thursday, 2 January 2025, City Direct Services 675, 676, 677 & 678 will be introduced to provide a faster connection to the city for commuters along the North-East Corridor. Please refer here for more information. From Sunday, 12 January 2025, bus service 967 will be introduced to enhance connectivity for commuters in Marsiling and Admiralty to nearby transport nodes and local amenities in Woodlands. Please refer here for more information. From Monday, 13 January 2025, bus service 912M will be withdrawn with the introduction of new bus service 967 under the Land Transport Authority’s Bus Connectivity Enhancement Programme (BCEP). Please refer here for more information.

Service 21
Route Information
Route	Pasir Ris Interchange ↔ St. Michael's Terminal
Route Length	27.4 km (towards St. Michael's) 25.0 km (towards Pasir Ris)
Travelling Time	130 mins (2 h 10 mins)
Operator	(Bishan – Toa Payoh Bus Package)

Bus Service 21 spans from Central to East, serving many residential areas throughout its route, such as Whampoa, Balestier, Boon Keng, Kallang, Paya Lebar, Eunos, Kaki Bukit, Bedok Reservoir, Tampines and Pasir Ris. Its lengthy route and large coverage makes it an important inter-town route, and as a result, journey time is relatively long for its length.

Introduced in 1992, the route originally ran between Pasir Ris Int and Lorong 1 Geylang Ter before being extended to St. Michael’s in 1993 following the merger with then-Service 4. Service 21 made history on 26 June 2006 as the first wheelchair-accessible bus service in Singapore following the debut of Volvo B9TL (CDGE) buses on the route.

The route has several key sectors offering important connections, such as that between St. Michael’s Estate and Novena MRT, Farrer Park and the Geylang district, as well as that between Eunos MRT and Bedok Reservoir Road. As such, in addition to demand from inter-town connections, the route experiences high demand throughout the day, and relies on fleet comprising mostly of double-decker buses. Around Farrer Park, the route plies very different stretches in either direction. The route was amended to serve Jalan Tenteram in both directions in April 2016.

Service 21 uses coloured information plates.

21

(towards Pasir Ris Interchange)

21

(towards Saint Michael's Terminal)

Short-Trip Service 21A operates only on Sundays and Public Holidays, and supplements the high demand for Service 21 from the Geylang area to Kitchener Road near Little India.

Service Information

Bus Duty & Fleet

Service 21/21A

Depot	Fleet Size		Fleet
	21	21A
Ang Mo Kio Depot (AMDEP)	29 Ang Mo Kio: 21 Bedok North: 8	4	10 Single Deckers	11 Double Deckers
			SBS6014Y SBS6624L Mercedes-Benz O530 Citaro SBS5023C SBS5109P SBS8280G SBS8287M SBS8289H SBS8816L SBS8823R SBS8830U Scania K230UB	SG6222A SG6223Y SG6233T SG6261L MAN ND323F SBS3158K SBS3186DA SBS3847E SBS3904Z SG5116E SG5118A Volvo B9TL
Bedok North Depot (BNDEP)		N/A	5 Single Deckers	3 Double Deckers
			SBS8179S SBS8230B SBS8532E SBS8662M SBS8667A Scania K230UB	SBS3013U SBS7668D SG5023P Volvo B9TL

Notes

1 missing AMDEP DD. Several random BNDEP DDs will operate on Service 21 on Weekends & Public Holidays. Several random AMDEP DDs will operate on Service 21 on Sundays & Public Holidays. Full DD fleet for BNDEP on Weekends & Public Holidays. Majority DD fleet for AMDEP on Sundays & Public Holidays. Weekdays: Ang Mo Kio 12A-12P / 7S / 2T; Bedok North 7A-6P / 1S (29 buses) Saturdays: Ang Mo Kio 12A-15P / 1T; Bedok North 7A-7P (23 buses) Sundays & Public Holidays: Ang Mo Kio 8A-10P / 2S / 6T; Bedok North 6A-7P (25 buses) Special Weekdays: Ang Mo Kio 12A-12P / 3E / 4S; Bedok North 6A-6P / 1E / 1T (28 buses) Special Saturdays: Ang Mo Kio 11A-13P / 2T; Bedok North 7A-8P (24 buses) Special Sundays: Ang Mo Kio 9A-11P / 3S / 3T; Bedok North 6A-7P (25 buses)

Service 21 duty allocation
Ang Mo Kio
Weekdays (12A-12P / 7S / 2T)
	A/P	SBS3158K, SBS3186D, SBS3847E, SBS3904Z, SBS5023C, SBS6014Y, SBS6624L, SG5116E, SG6222A, SG6223Y, SG6233T & SG6261L
	S	SBS5109P, SBS8280G, SBS8287M, SBS8289H & SBS8816L
	T	SBS8823R & SBS8830U
Saturdays (12A-15P / 1T)
	A/P	SBS5023C, SBS8287M, SBS3186D, SG5116E, SG6222A, SG6223Y, SG6233T & SG6261L
	P	SBS8823R
	T	SBS3158K
Sundays & Public Holidays (8A-10P / 2S / 6T)
	A/P	SBS3158K, SBS6014Y, SBS6624L, SG6222A, SG6223Y, SG6233T & SG6261L
	P	SBS3847E
	S	SG5116E
	T	SBS3186D
Bedok North
Weekdays (7A-6P / 1S)
	A/P	SBS3013U, SBS7668D, SBS8179S, SBS8532E, SBS8662M & SG5023P
	A	SBS8230B
	S	SBS8667A
Saturdays (7A-7P)
	A/P	SBS3013U, SBS7668D, SG5023P & 4 Random DDs
Sundays & Public Holidays (6A-7P)
	A/P	SBS3013U, SBS7668D, SG5023P & 3 Random DDs
	P	Random DD

Route Information

Frequency

Period	AM Peak (First Bus - 08:30)	AM Off Peak (08:31 - 16:59)	PM Peak (17:00 - 19:00)	PM Off Peak (19:01 - Last Bus)
towards St. Michael's	07 - 15 minutes	08 - 16 minutes	11 - 16 minutes	12 - 16 minutes
towards Pasir Ris	10 - 15 minutes	08 - 15 minutes	08 - 17 minutes	12 - 16 minutes

Special Departures

• Aft Lor 106 Changi 82069
  Changi Rd → St. Michael's Ter 52499
  Whampoa Rd
  • Weekdays: 05:55 & 06:10
  • Saturdays: 05:55 & 06:06
  • Sundays & Public Holidays: 05:55 (SBS3158K)
• Bef Lor 18 Geylang 80089
  Geylang Rd → St. Michael's Ter 52499
  Whampoa Rd
  • Sundays & Public Holidays: 17:51 (SBS3186D), 18:15 & 18:31
• Eunos Stn/Int 82061
  Sims Ave → Pasir Ris Int 77009
  Pasir Ris Dr 3
  • Weekdays: 05:50, 06:00, 06:18 & 06:31

Service 21A

SBS6166S on Short-Trip Service 21A

• Bef Lor 18 Geylang 80089
  Geylang Rd → Bef Tai Hoe Hotel 07231
  Kitchener Rd
  • Sundays & Public Holidays: 16:52 (SBS3186D), 17:11 (DD), 17:22 (DD), 17:42 (DD) & 17:56

Direction 1 (Pasir Ris → St. Michael's)

[Show/Hide Full Route Details]

Bus Stops		Nearby Attraction	Weekdays		Saturdays		Suns / PHs
			First bus	Last bus	First bus	Last bus	First bus	Last bus
Pasir Ris Int(Berth B1) 77009 Pasir Ris Dr 3		EW1Pasir Ris	05:30	00:00	05:30	00:00	05:30	00:00
Downtown East 78109 Pasir Ris Dr 3			05:33	00:03	05:33	00:03	05:33	00:03
Blk 467 78081 Pasir Ris Dr 6			05:35	00:05	05:35	00:05	05:34	00:05
Blk 446 78071 Pasir Ris Dr 6			05:37	00:06	05:36	00:06	05:35	00:06
Blk 442 78069 Pasir Ris Dr 1			05:38	00:07	05:37	00:07	05:36	00:07
Blk 191 78031 Pasir Ris St 12			05:39	00:08	05:38	00:08	05:37	00:08
Bef Blk 187 78181 Pasir Ris St 11			05:40	00:08	05:38	00:08	05:37	00:08
Aft Blk 182 78191 Pasir Ris St 11			05:43	00:11	05:41	00:11	05:40	00:11
Blk 269A 98099 Pasir Ris Dr 1			05:44	00:12	05:43	00:13	05:42	00:12
Opp Blk 149A 98019 Loyang Ave			05:47	00:15	05:45	00:15	05:44	00:15
Blk 370 76249 Tampines Ave 7			05:52	00:19	05:50	00:20	05:49	00:19
Blk 390 76239 Tampines Ave 7			05:53	00:20	05:51	00:21	05:50	00:20
Opp Tampines East Stn 76229 Tampines Ave 7		DT33Tampines East	05:54	00:21	05:52	00:22	05:51	00:21
Blk 230E 76219 Tampines Ave 7			05:55	00:22	05:53	00:23	05:52	00:21
Blk 233 76209 Tampines Ave 7			05:56	00:23	05:54	00:24	05:53	00:22
Opp Tampines Stn/Int 76149 Tampines Ave 4		EW2DT32Tampines	05:58	00:24	05:56	00:25	05:54	00:23
Opp Century Sq 76139 Tampines Ave 4			05:59	00:25	05:57	00:26	05:55	00:24
Blk 147 76069 Tampines Ave 5			06:01	00:27	05:59	00:27	05:57	00:26
Bef Tampines West Stn 75059 Tampines Ave 1		DT31Tampines West	06:03	00:29	06:01	00:29	05:59	00:28
Blk 960A 75069 Bedok Resvr Rd			06:05	00:31	06:03	00:31	06:02	00:30
The Clearwater Condo 75349 Bedok Resvr Rd			06:05	00:31	06:03	00:31	06:02	00:30
Waterfront Key 84609 Bedok Resvr Rd			06:07	00:33	06:05	00:33	06:04	00:32
Aft Waterfront Waves 84639 Bedok Resvr Rd			06:08	00:33	06:06	00:33	06:04	00:32
Waterfront Isle 84619 Bedok Resvr Rd			06:09	00:34	06:06	00:34	06:05	00:33
Blk 716 84629 Bedok Resvr Rd			06:10	00:34	06:07	00:34	06:05	00:33
Blk 713 84479 Bedok Resvr Rd			06:11	00:35	06:08	00:35	06:06	00:34
Blk 703 84469 Bedok Resvr Rd			06:12	00:36	06:09	00:36	06:07	00:35
Aft Bedok Ind Pk C 84481 Bedok Resvr Rd			06:15	00:38	06:12	00:38	06:09	00:36
Blk 629 84491 Bedok Resvr Rd			06:16	00:39	06:13	00:39	06:10	00:37
Blk 609 72079 Bedok Resvr Rd			06:18	00:40	06:15	00:40	06:11	00:38
Blk 121 72069 Bedok Resvr Rd			06:19	00:41	06:16	00:41	06:12	00:39
Opp Blk 646 72029 Bedok Resvr Rd			06:20	00:42	06:17	00:42	06:13	00:40
Opp Blk 322 72019 Jln Eunos			06:22	00:43	06:19	00:43	06:14	00:41
Opp Blk 16 83119 Jln Eunos			06:25	00:45	06:21	00:45	06:16	00:43
Opp Eunos Stn 83109 Jln Eunos		EW7Eunos	06:25	00:46	06:22	00:46	06:17	00:43
Aft Lor 106 Changi 82069 Changi Rd			05:55	00:48	05:55	00:48	05:55	00:45
Joo Chiat Cplx 82049 Changi Rd			05:57	00:49	05:57	00:50	05:57	00:47
Blk 14 Mkt/FC 82029 Geylang Rd			05:58	00:51	05:58	00:51	05:58	00:48
City Plaza 82109 Geylang Rd			05:59	00:52	05:59	00:52	05:59	00:49
Opp Lor 39 Geylang 81069 Geylang Rd			06:01	00:52	06:00	00:53	06:01	00:50
Aft Lor 34 Geylang 81049 Geylang Rd			06:02	00:54	06:01	00:54	06:02	00:51
Aft Lor 28 Geylang 81029 Geylang Rd			06:03	00:54	06:02	00:55	06:03	00:52
Bef Lor 18 Geylang 80089 Geylang Rd	21A		06:04	00:56	06:04	00:57	06:04	00:54
Opp Mohd Salleh Mque 80069 Geylang Rd	21A		06:06	00:57	06:05	00:58	06:06	00:55
Aft Sims Way 80049 Geylang Rd	21A		06:08	00:59	06:07	01:00	06:09	00:57
Kallang Stn/Opp Blk 2C 80101 Lor 1 Geylang	21A	EW10Kallang	06:08	01:00	06:08	01:01	06:08	00:58
Opp Kallang Pl 60051 Boon Keng Rd	21A		06:11	01:02	06:11	01:04	06:10	01:01
Bef Lavender St 60099 Bendemeer Rd	21A		06:13	01:04	06:13	01:06	06:12	01:03
Hoa Nam Bldg 07329 Jln Besar	21A		06:14	01:05	06:14	01:07	06:13	01:04
Bef Tai Hoe Hotel 07231 Kitchener Rd	21A		06:16	01:07	06:16	01:09	06:16	01:06
Aft Farrer Pk Stn Exit G 07211 S'goon Rd		NE8Farrer Park	06:18	01:08	06:18	01:11	06:18	01:07
Sri Vadapathira K Tp 07221 S'goon Rd			06:19	01:09	06:19	01:12	06:19	01:08
S'pore Khalsa Assn 50249 Balestier Rd			06:21	01:11	06:21	01:13	06:21	01:09
S'pore Indian Assn 50239 Balestier Rd			06:22	01:11	06:22	01:14	06:22	01:10
Opp Natl Skin Ctr 50129 Moulmein Rd			06:24	01:13	06:25	01:16	06:25	01:11
St. Joseph Instn Jnr 50119 Moulmein Rd			06:26	01:14	06:27	01:17	06:27	01:13
Opp Novena Ch 50031 Thomson Rd		NS20Novena	06:28	01:16	06:27	01:19	06:27	01:14
Novena Lodge 50041 Thomson Rd			06:29	01:17	06:28	01:20	06:28	01:15
Bef Jln Dusun 50161 Balestier Rd			06:32	01:18	06:30	01:22	06:30	01:16
Zhongshan Mall 50171 Balestier Rd			06:33	01:19	06:32	01:23	06:32	01:17
Bef Balestier Plaza 50191 Balestier Rd			06:35	01:20	06:33	01:24	06:33	01:18
Shaw Plaza 50201 Balestier Rd			06:36	01:21	06:34	01:24	06:34	01:19
Opp Balestier Pt 50211 Balestier Rd			06:37	01:22	06:35	01:25	06:35	01:20
Blk 82 50991 Whampoa Dr			06:38	01:23	06:38	01:27	06:36	01:21
Blk 29 52129 Jln Bahagia* 21(towards St. Michael's Terminal)			06:40	01:24	06:40	01:28	06:39	01:22
Blk 19 52049 Jln Tenteram* 21(towards St. Michael's Terminal)			06:41	01:25	06:41	01:29	06:40	01:23
Opp Blk 65 52119 Jln Tenteram* 21(towards St. Michael's Terminal)			06:43	01:27	06:43	01:31	06:42	01:25
St. Michael's Ter(Berth B1) 52499 Whampoa Rd			06:45	01:28	06:46	01:32	06:42	01:26

^* Do check the direction of the bus as both directions stop at this bus stop.

Direction 2 (St. Michael's → Pasir Ris)

[Show/Hide Full Route Details]

Bus Stops	Nearby Attraction	Weekdays		Saturdays		Suns / PHs
		First bus	Last bus	First bus	Last bus	First bus	Last bus
St. Michael's Ter(Berth B1) 52499 Whampoa Rd		05:30	00:00	05:30	00:00	05:30	00:00
Blk 114 52451 Whampoa Rd		05:31	00:01	05:31	00:01	05:31	00:01
Blk 29 52129 Jln Bahagia* 21(towards Pasir Ris Interchange)		05:32	00:02	05:32	00:02	05:32	00:02
Blk 19 52049 Jln Tenteram* 21(towards Pasir Ris Interchange)		05:33	00:03	05:33	00:03	05:33	00:03
Opp Blk 65 52119 Jln Tenteram* 21(towards Pasir Ris Interchange)		05:35	00:04	05:35	00:05	05:35	00:05
Opp NKF 52099 Kim Keat Rd		05:36	00:05	05:36	00:06	05:36	00:06
Bef Kim Keat Lane 50159 Kim Keat Rd		05:37	00:06	05:37	00:07	05:37	00:07
Aft Pegu Rd 50209 Balestier Rd		05:38	00:07	05:38	00:08	05:38	00:08
Opp Shaw Plaza 50199 Balestier Rd		05:38	00:07	05:39	00:08	05:39	00:08
Opp Public Mansion 50189 Balestier Rd		05:39	00:08	05:40	00:09	05:40	00:09
Opp Zhongshan Mall 50179 Balestier Rd		05:40	00:09	05:41	00:10	05:41	00:00
Aft Irrawaddy Rd 50169 Balestier Rd		05:41	00:10	05:42	00:11	05:42	00:11
Opp Thomson Med Ctr 50059 Thomson Rd		05:43	00:12	05:43	00:13	05:43	00:13
Opp Novena Lodge 50049 Thomson Rd		05:43	00:12	05:44	00:13	05:44	00:13
Novena Stn 50038 Thomson Rd	NS20Novena	05:45	00:14	05:46	00:14	05:46	00:15
Revival Ctr Ch 50111 Moulmein Rd		05:47	00:15	05:47	00:16	05:47	00:16
Natl Skin Ctr 50121 Moulmein Rd		05:48	00:16	05:49	00:17	05:49	00:17
NorthLight Sch 50231 Balestier Rd		05:50	00:18	05:51	00:19	05:51	00:19
Blk 122 50331 Mcnair Rd		05:52	00:19	05:52	00:20	05:52	00:20
Blk 107 50349 Towner Rd		05:53	00:19	05:53	00:21	05:53	00:21
Boon Keng Stn/Blk 22 60199 Boon Keng Rd	NE9Boon Keng	05:54	00:20	05:54	00:22	05:54	00:22
Bef Kallang Pl 60059 Boon Keng Rd		05:56	00:22	05:56	00:24	05:56	00:24
Opp Kallang Stn/Blk 2C 80109 Lor 1 Geylang	EW10Kallang	05:59	00:24	05:59	00:26	05:59	00:26
Aft Lor 1 Geylang 80051 Sims Ave		06:00	00:25	06:00	00:27	06:00	00:27
Yi Xiu Fty Bldg 80071 Sims Ave		06:02	00:27	06:01	00:29	06:01	00:29
Bef Lor 23 Geylang 80091 Sims Ave		06:07	00:30	06:05	00:32	06:06	00:32
Aft Aljunied Stn 81011 Sims Ave	EW9Aljunied	06:05	00:29	06:04	00:31	06:04	00:31
Blk 134 81031 Sims Ave		06:06	00:30	06:05	00:32	06:05	00:32
Sims Ville 81051 Sims Ave		06:08	00:32	06:06	00:34	06:07	00:34
Aft Paya Lebar Quarter 82011 Sims Ave	EW8CC9Paya Lebar	06:10	00:33	06:08	00:35	06:09	00:35
Blk 416 82032 Sims Ave		06:11	00:34	06:09	00:36	06:10	00:36
Eunos Stn/Int 82061 Sims Ave	EW7Eunos	05:50	00:36	06:11	00:38	06:12	00:38
Eunos Stn 83101 Jln Eunos		05:52	00:38	06:13	00:39	06:14	00:39
Blk 17 83111 Jln Eunos		05:53	00:39	06:14	00:40	06:15	00:40
Blk 322 72011 Jln Eunos		05:55	00:41	06:16	00:42	06:17	00:42
Blk 646 72021 Bedok Resvr Rd		05:57	00:42	06:17	00:43	06:19	00:43
Blk 122 72061 Bedok Resvr Rd		05:58	00:44	06:19	00:45	06:21	00:45
Blk 133 72071 Bedok Resvr Rd		05:59	00:45	06:20	00:46	06:22	00:46
Blk 140 84499 Bedok Resvr Rd		06:01	00:46	06:21	00:47	06:23	00:47
Opp Bedok Ind Pk C 84489 Bedok Resvr Rd		06:03	00:48	06:23	00:49	06:25	00:49
Opp Blk 701 84461 Bedok Resvr Rd		06:05	00:50	06:24	00:50	06:27	00:50
Blk 745 84471 Bedok Resvr Rd		06:06	00:51	06:25	00:51	06:28	00:51
Opp Blk 716 84621 Bedok Resvr Rd		06:07	00:52	06:26	00:52	06:29	00:52
Opp Waterfront Isle 84611 Bedok Resvr Rd		06:09	00:53	06:27	00:53	06:30	00:53
Opp Waterfront Waves 84631 Bedok Resvr Rd		06:09	00:54	06:28	00:54	06:31	00:54
Opp Waterfront Key 84601 Bedok Resvr Rd		06:10	00:54	06:28	00:54	06:31	00:54
Opp The Clearwater Condo 75341 Bedok Resvr Rd		06:11	00:55	06:30	00:55	06:33	00:56
Blk 954D 75061 Bedok Resvr Rd		06:13	00:56	06:31	00:56	06:34	00:57
Tampines West Stn Exit B 75051 Tampines Ave 1	DT31Tampines West	06:14	00:58	06:33	00:58	06:36	00:59
Blk 938 76061 Tampines Ave 5		06:16	01:00	06:35	01:00	06:38	01:01
UOB Tampines Ctr 76131 Tampines Ave 4		06:18	01:01	06:37	01:01	06:40	01:03
Tampines Stn/Int 76141 Tampines Ave 4	EW2DT32Tampines	06:20	01:02	06:38	01:02	06:41	01:04
Blk 423 76201 Tampines Ave 7		06:23	01:04	06:40	01:04	06:43	01:06
Blk 449 76211 Tampines Ave 7		06:25	01:05	06:41	01:05	06:44	01:07
Tampines East Stn Exit A 76221 Tampines Ave 7	DT33Tampines East	06:26	01:06	06:42	01:06	06:45	01:08
Opp Blk 390 76231 Tampines Ave 7		06:29	01:08	06:44	01:08	06:46	01:09
Blk 497D 76241 Tampines Ave 7		06:29	01:09	06:45	01:09	06:47	01:10
Blk 149A 98011 Loyang Ave		06:32	01:12	06:48	01:12	06:50	01:13
Blk 156 98091 Pasir Ris Dr 1		06:34	01:14	06:50	01:13	06:51	01:14
Opp White Sands Pr Sch 78199 Pasir Ris St 11		06:36	01:15	06:51	01:15	06:53	01:16
Opp Blk 187 78189 Pasir Ris St 11		06:38	01:17	06:53	01:16	06:54	01:17
Blk 104 78039 Pasir Ris St 12		06:39	01:17	06:53	01:17	06:55	01:18
Opp Pasir Ris Polyclinic 78061 Pasir Ris Dr 1		06:39	01:18	06:54	01:17	06:55	01:18
Blk 429 78079 Pasir Ris Dr 6		06:41	01:20	06:56	01:18	06:56	01:19
Blk 405 78089 Pasir Ris Dr 6		06:44	01:22	06:58	01:20	06:58	01:21
Opp Downtown East 78101 Pasir Ris Dr 3		06:46	01:24	07:00	01:22	07:00	01:23
Pasir Ris Int(Alighting) 77009 Pasir Ris Dr 3	EW1Pasir Ris	06:50	01:27	07:03	01:25	07:03	01:26

^* Do check the direction of the bus as both directions stop at this bus stop.

Historical Information

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Pasir Ris ↔ Lor 1 Geylang	1992	29 November	Introduced between Pasir Ris Int and Lor 1 Geylang Ter under TransitLink Network Integration Exercise Phase 10.
	Pasir Ris ↔ St. Michael's	1993	23 May	Integrated with Service 4 and extended to St Michael's Ter under TransitLink Network Integration Exercise Phase 13.
		1994	TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2001	18 February	Serves new staggered bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Ch.
		2002	TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Bendemeer Rd, Jln Besar, Kitchener Rd and Serangoon Rd under North East Line Rationalisation Phase 1.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards St. Michael's Ter with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards St. Michael's Ter, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2006	26 June	Designated wheelchair-accessible bus service (WAB).
	21Pasir Ris ↔ St. Michael's 21AGeylang Rd → Kitchener Rd	2014	25 May	21AIntroduced from Geylang Rd (Bef Lor 18 Geylang) to Kitchener Rd (Bef Tai Hoe Hotel) on Sundays and Public Holidays. Wheelchair-accessible bus service (WAB) at launch.
		2016	24 April	Amended to ply Jln Tenteram in both directions.
		2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR4Pasir Ris East station on the Cross Island Line.