| Hemel Hempstead to Nyon | 478.84 mi (770.62 km) |
| Hemel Hempstead to Oberriet | 543.72 mi (875.04 km) |
| Hemel Hempstead to Obersiggenthal | 490.03 mi (788.63 km) |
| Hemel Hempstead to Oberwil | 462.92 mi (744.99 km) |
| Hemel Hempstead to Oberwingert | 505.89 mi (814.15 km) |
| Hemel Hempstead to Oftringen | 484.59 mi (779.87 km) |
| Hemel Hempstead to Olten | 482.46 mi (776.45 km) |
| Hemel Hempstead to Onex | 486.27 mi (782.57 km) |
| Hemel Hempstead to Opfikon | 502.24 mi (808.28 km) |
| Hemel Hempstead to Ostermundigen | 487.52 mi (784.59 km) |
| Hemel Hempstead to Payerne | 476.63 mi (767.06 km) |
| Hemel Hempstead to Pfaffikon | 512.97 mi (825.55 km) |
| Hemel Hempstead to Plan-les-Ouates | 487.66 mi (784.82 km) |
| Hemel Hempstead to Pratteln | 467.81 mi (752.87 km) |
| Hemel Hempstead to Prilly | 481.36 mi (774.68 km) |
