| Letchworth to Bougival | 239.01 mi (384.65 km) |
| Letchworth to Bouguenais | 337.47 mi (543.11 km) |
| Letchworth to Boulogne-Billancourt | 242.85 mi (390.82 km) |
| Letchworth to Boulogne-sur-Mer | 117.53 mi (189.14 km) |
| Letchworth to Bourg-de-Peage | 536.65 mi (863.65 km) |
| Letchworth to Bourg-en-Bresse | 468.82 mi (754.49 km) |
| Letchworth to Bourg-la-Reine | 247.78 mi (398.76 km) |
| Letchworth to Bourg-les-Valence | 539.21 mi (867.78 km) |
| Letchworth to Bourges | 357.98 mi (576.11 km) |
| Letchworth to Bourgoin-Jallieu | 507.42 mi (816.62 km) |
| Letchworth to Bressuire | 355.19 mi (571.62 km) |
| Letchworth to Brest | 311.30 mi (500.99 km) |
| Letchworth to Bretigny-sur-Orge | 258.10 mi (415.37 km) |
| Letchworth to Breuillet | 258.46 mi (415.95 km) |
| Letchworth to Briancon | 581.21 mi (935.36 km) |
