| 05/09/2021 |
 |
Stage 1 : Penzance - Bodmin | 180 km | |
| 06/09/2021 |
|
Stage 2 : Sherford - Exeter | 184 km | |
| 07/09/2021 | Stage 3 : Carmarthenshire - Carmarthenshire | 18 km | ||
| 08/09/2021 |
|
Stage 4 : Aberaeron - Great Orme, Llandudno | 210 km | |
| 09/09/2021 |
|
Stage 5 : Alderley Park - Warrington | 152 km | |
| 10/09/2021 |
|
Stage 6 : Carlistle - Gateshead | 198 km | |
| 11/09/2021 |
|
Stage 7 : Hawick - Edinburgh | 194 km | |
| 12/09/2021 |
|
Stage 8 : Stonehaven - Aberdeen | 173 km |
Stage 3 Tour of Britain 2021 (Carmarthenshire - Carmarthenshire)
| Stage 3: Carmarthenshire-Carmarthenshire | Total: 18km |
|---|
| Classement | ||
|---|---|---|
| 1. | Wout Van Aert | 31:42:22 |
| 2. | Ethan Hayter | +0:06 |
| 3. | Julian Alaphilippe | +0:27 |
| 4. | Mikkel Frolich Honore | +0:41 |
| 5. | Michael Woods | +1:00 |
| 6. | Rohan Dennis | +1:14 |
| 7. | Daniel Martin | +1:16 |
| 8. | Kristian Sbaragli | +1:43 |
| 9. | Mark Donovan | +2:04 |
| 10. | Carlos Rodriguez | +2:07 |