| Caernarfon to Bougival | 405.78 mi (653.04 km) |
| Caernarfon to Bouguenais | 428.25 mi (689.20 km) |
| Caernarfon to Boulogne-Billancourt | 410.36 mi (660.41 km) |
| Caernarfon to Boulogne-sur-Mer | 300.95 mi (484.33 km) |
| Caernarfon to Bourg-de-Peage | 699.66 mi (1,125.99 km) |
| Caernarfon to Bourg-en-Bresse | 639.20 mi (1,028.69 km) |
| Caernarfon to Bourg-la-Reine | 415.47 mi (668.64 km) |
| Caernarfon to Bourg-les-Valence | 700.74 mi (1,127.73 km) |
| Caernarfon to Bourges | 511.68 mi (823.48 km) |
| Caernarfon to Bourgoin-Jallieu | 674.70 mi (1,085.83 km) |
| Caernarfon to Bressuire | 466.41 mi (750.61 km) |
| Caernarfon to Brest | 328.33 mi (528.40 km) |
| Caernarfon to Bretigny-sur-Orge | 424.04 mi (682.42 km) |
| Caernarfon to Breuillet | 422.53 mi (680.00 km) |
| Caernarfon to Briancon | 752.41 mi (1,210.89 km) |
