Cardiff Bus Route 21
Bus timetable and route map · Monday to Friday, Saturday, Sunday
Cardiff Bus Route 21 is a bus route in Cardiff, Penarth and the Vale of Glamorgan, serving Cardiff Bus Interchange, Cross Inn, Lon Ysgubor and St Josephs Convent. Monday to Friday the first bus is at 07:00 and the last at 21:35, every 30 min during the day. Updated 4 October 2026.
Timetable summary
Monday to Friday
- First
- 07:00
- Last
- 21:35
- Buses
- 27
- Daytime
- every 30 min
Saturday
- First
- 07:28
- Last
- 21:35
- Buses
- 24
- Daytime
- every 30 min
Sunday
- First
- 07:55
- Last
- 21:37
- Buses
- 16
- Daytime
- every 1 h
Timetable change: Cardiff Bus’ timetable changes on 22 October 2026. The times below are for the current timetable.
Route 21 to Cardiff Bus Interchange
Destination sign “City Centre” · from Cardiff Bus Interchange · 47 stops
Monday to Friday
Times at the main stops. 24-hour clock. A dot means that trip does not stop there.
| Cardiff Bus Interchange | Cross Inn | Lon-y-Rhyd | Lon Ysgubor | Whitchurch Library | St Josephs Convent | Cardiff Bus Interchange |
|---|---|---|---|---|---|---|
| 07:00 | 07:12 | 07:20 | 07:25 | 07:39 | 07:51 | 08:03 |
| 07:24 | · | · | · | · | · | · |
| 07:27 | 07:42 | 07:51 | 07:59 | 08:16 | 08:32 | 08:50 |
| 08:10 | 08:27 | 08:36 | 08:44 | 08:58 | 09:10 | 09:27 |
| 08:45 | 08:59 | 09:09 | 09:16 | 09:27 | 09:38 | 09:55 |
| 09:15 | 09:29 | 09:39 | 09:46 | 09:57 | 10:08 | 10:25 |
| 09:45 | 09:59 | 10:09 | 10:16 | 10:27 | 10:38 | 10:55 |
| 10:15 | 10:29 | 10:39 | 10:46 | 10:57 | 11:08 | 11:25 |
| 10:45 | 10:59 | 11:09 | 11:16 | 11:27 | 11:38 | 11:55 |
| 11:15 | 11:29 | 11:39 | 11:46 | 11:57 | 12:08 | 12:25 |
| 11:45 | 11:59 | 12:09 | 12:16 | 12:27 | 12:38 | 12:55 |
| 12:15 | 12:29 | 12:39 | 12:46 | 12:57 | 13:08 | 13:25 |
| 12:45 | 12:59 | 13:09 | 13:16 | 13:27 | 13:38 | 13:55 |
| 13:15 | 13:29 | 13:39 | 13:46 | 13:57 | 14:08 | 14:25 |
| 13:45 | 13:59 | 14:09 | 14:16 | 14:27 | 14:38 | 14:55 |
| 14:15 | 14:33 | 14:42 | 14:48 | 15:00 | 15:10 | 15:27 |
| 14:45 | 15:03 | 15:12 | 15:20 | 15:31 | 15:43 | 16:00 |
| 15:15 | 15:33 | 15:42 | 15:50 | 16:01 | 16:13 | 16:30 |
| 15:50 | 16:08 | 16:17 | 16:25 | 16:36 | 16:48 | 17:05 |
| 16:20 | 16:38 | 16:47 | 16:55 | 17:06 | 17:18 | 17:35 |
| 16:50 | 17:08 | 17:17 | 17:25 | 17:36 | 17:48 | 18:05 |
| 17:25 | 17:43 | 17:52 | 18:00 | 18:11 | 18:23 | 18:40 |
| 17:55 | 18:13 | 18:22 | 18:30 | 18:41 | 18:53 | 19:10 |
| 18:40 | 18:57 | 19:05 | 19:11 | 19:21 | 19:31 | 19:48 |
| 19:35 | 19:51 | 19:59 | 20:04 | 20:14 | 20:24 | 20:36 |
| 20:35 | 20:49 | 20:55 | 20:59 | 21:09 | 21:18 | 21:30 |
| 21:35 | 21:49 | 21:55 | 21:59 | 22:09 | 22:18 | 22:30 |
Saturday
Times at the main stops. 24-hour clock. A dot means that trip does not stop there.
| Cardiff Bus Interchange | Cross Inn | Lon-y-Rhyd | Lon Ysgubor | Whitchurch Library | St Josephs Convent | Cardiff Bus Interchange |
|---|---|---|---|---|---|---|
| 07:28 | · | · | · | · | · | · |
| 07:35 | 07:48 | 07:56 | 08:03 | 08:12 | 08:21 | 08:33 |
| 08:40 | 08:53 | 09:01 | 09:08 | 09:17 | 09:26 | 09:38 |
| 09:15 | 09:28 | 09:36 | 09:43 | 09:52 | 10:01 | 10:11 |
| 09:45 | 09:58 | 10:07 | 10:14 | 10:23 | 10:33 | 10:50 |
| 10:15 | 10:28 | 10:37 | 10:44 | 10:53 | 11:03 | 11:20 |
| 10:45 | 10:58 | 11:07 | 11:14 | 11:23 | 11:33 | 11:50 |
| 11:15 | 11:28 | 11:37 | 11:44 | 11:53 | 12:03 | 12:20 |
| 11:45 | 11:58 | 12:07 | 12:14 | 12:23 | 12:33 | 12:50 |
| 12:15 | 12:28 | 12:37 | 12:44 | 12:53 | 13:03 | 13:20 |
| 12:45 | 12:58 | 13:07 | 13:14 | 13:23 | 13:33 | 13:50 |
| 13:15 | 13:28 | 13:37 | 13:44 | 13:53 | 14:03 | 14:20 |
| 13:45 | 13:58 | 14:07 | 14:14 | 14:23 | 14:33 | 14:50 |
| 14:15 | 14:28 | 14:37 | 14:44 | 14:53 | 15:03 | 15:20 |
| 14:45 | 14:58 | 15:07 | 15:14 | 15:23 | 15:33 | 15:50 |
| 15:15 | 15:28 | 15:37 | 15:44 | 15:53 | 16:03 | 16:20 |
| 15:45 | 15:58 | 16:07 | 16:14 | 16:23 | 16:33 | 16:50 |
| 16:15 | 16:28 | 16:37 | 16:44 | 16:53 | 17:03 | 17:20 |
| 17:00 | 17:13 | 17:22 | 17:29 | 17:38 | 17:48 | 18:05 |
| 17:30 | 17:43 | 17:52 | 17:59 | 18:08 | 18:18 | 18:30 |
| 18:35 | 18:48 | 18:56 | 19:03 | 19:12 | 19:21 | 19:33 |
| 19:35 | 19:46 | 19:54 | 20:01 | 20:09 | 20:18 | 20:30 |
| 20:35 | 20:46 | 20:54 | 21:01 | 21:09 | 21:18 | 21:30 |
| 21:35 | 21:46 | 21:54 | 22:01 | 22:09 | 22:18 | 22:30 |
Sunday
Times at the main stops. 24-hour clock. A dot means that trip does not stop there.
| Cardiff Bus Interchange | Cross Inn | Lon-y-Rhyd | Lon Ysgubor | Whitchurch Library | St Josephs Convent | Cardiff Bus Interchange |
|---|---|---|---|---|---|---|
| 07:55 | · | · | · | · | · | · |
| 08:25 | · | · | · | · | · | · |
| 08:32 | 08:46 | 08:54 | 09:01 | 09:09 | 09:19 | 09:35 |
| 09:37 | 09:51 | 09:59 | 10:06 | 10:14 | 10:24 | 10:40 |
| 10:37 | 10:51 | 10:59 | 11:06 | 11:14 | 11:24 | 11:40 |
| 11:37 | 11:51 | 11:59 | 12:06 | 12:14 | 12:24 | 12:40 |
| 12:37 | 12:51 | 12:59 | 13:06 | 13:14 | 13:24 | 13:40 |
| 13:37 | 13:51 | 13:59 | 14:06 | 14:14 | 14:24 | 14:40 |
| 14:37 | 14:51 | 14:59 | 15:06 | 15:14 | 15:24 | 15:40 |
| 15:37 | 15:53 | 16:01 | 16:08 | 16:16 | 16:25 | 16:40 |
| 16:37 | 16:53 | 17:01 | 17:08 | 17:16 | 17:25 | 17:40 |
| 17:37 | 17:53 | 18:01 | 18:08 | 18:16 | 18:25 | 18:40 |
| 18:37 | 18:51 | 18:59 | 19:05 | 19:13 | 19:21 | 19:32 |
| 19:37 | 19:51 | 19:59 | 20:05 | 20:13 | 20:21 | 20:32 |
| 20:37 | 20:49 | 20:57 | 21:03 | 21:11 | 21:19 | 21:30 |
| 21:37 | 21:49 | 21:57 | 22:03 | 22:11 | 22:19 | 22:30 |
All 47 stops in this direction
- Cardiff Bus Interchange #5710WDB48561
- Westgate Street KN #5710AWA10721
- Kingsway GA #5710AWA11092
- Corbett Road #5710AWA11116
- Blackweir #5710AWA10841
- Maindy Stadium #5710AWA10842
- Parkfield Place #5710AWA10843
- North Road Clinic #5710AWA10844
- Cross Inn #5710AWA10851
- Birchgrove #5710AWA10854
- Pantbach Avenue #5710AWA10990
- Welwyn Road #5710AWA10991
- Kyle Avenue #5710AWA10994
- Rhiwbina Stn #5710AWA10996
- Rhiwbina (Shopping Centre) #5710AWA10999
- Lon-y-Rhyd #5710AWA11001
- Heol y Deri #5710AWA11002
- Heol Nant Castan #5710AWA11004
- Heol Llanishen Fach #5710AWA11006
- Heol Uchaf Spar #5710AWA11008
- Heol Lewis #5710AWA11017
- Gron Ffordd #5710AWA11018
- Wenallt Road #5710AWA11021
- Lon Ysgubor #5710AWA11023
- The Deri #5710AWA11024
- Rhiwbina Hill #5710AWA11026
- Caer Wenallt North #5710AWA11028
- Caer Wenallt South #5710AWA11039
- Heol Pant Y Rhyn #5710AWA11055
- Hollybush Inn #5710AWA11056
- Hospital #5710AWA11065
- Whitchurch Library #5710AWA11066
- Plas y Llan #5710AWA11068
- Merthyr Road Shops #5710AWA11070
- Three Elms #5710AWA11071
- Ararat Church #5710AWA11074
- The Philog #5710AWA11076
- Cross Inn #5710AWA11080
- St Josephs Convent #5710AWA10971
- Cathays High School #5710AWA10972
- Blackweir #5710AWA10840
- Rosemount #5710AWA11115
- College Road RK #5710AWA11117
- Law Courts #5710AWA11118
- Kingsway GR #5710AWA11097
- Westgate Street (KG) #5710WDB21799
- Cardiff Bus Interchange #5710WDB48561
Route 21 route map
Questions about Cardiff Bus Route 21
What time is the first Route 21 bus?
Monday to Friday: 07:00. Saturday: 07:28. Sunday: 07:55.
What time is the last Route 21 bus?
Monday to Friday: 21:35. Saturday: 21:35. Sunday: 21:37. A time after midnight belongs to the evening before.
How often does Route 21 run?
Monday to Friday: every 30 min. Saturday: every 30 min. Sunday: every 1 h, between 07:00 and 19:00.
Does Route 21 run at weekends?
Saturday: yes. Sunday: yes.
Where does Route 21 go?
Route 21 serves Cardiff Bus Interchange, Cross Inn, Lon Ysgubor and St Josephs Convent. The full list of stops for each direction is below the timetables.
Are these live bus times?
No. They are the published timetable from Cardiff Bus’ open data, refreshed 4 October 2026. A bus can run early or late, and disruptions are not shown.
Source: Cardiff Bus open data (GTFS schedule for Cardiff Bus), used under the Open Government Licence v3.0. Refreshed 4 October 2026. These are scheduled times; disruptions and service alerts are published by the operator. Contains public sector information licensed under the Open Government Licence v3.0. Changes made: times reformatted into timetables and departure lists.