| Welwyn Garden City to Noventa Vicentina | 699.12 mi (1,125.13 km) |
| Welwyn Garden City to Novi di Modena | 696.91 mi (1,121.56 km) |
| Welwyn Garden City to Novi Ligure | 637.40 mi (1,025.80 km) |
| Welwyn Garden City to Nuoro | 914.10 mi (1,471.10 km) |
| Welwyn Garden City to Occhiobello | 718.44 mi (1,156.22 km) |
| Welwyn Garden City to Oderzo | 710.25 mi (1,143.04 km) |
| Welwyn Garden City to Oggiono | 600.62 mi (966.61 km) |
| Welwyn Garden City to Olbia | 881.29 mi (1,418.30 km) |
| Welwyn Garden City to Oleggio | 587.29 mi (945.15 km) |
| Welwyn Garden City to Olgiate Comasco | 588.22 mi (946.65 km) |
| Welwyn Garden City to Olgiate Olona | 593.36 mi (954.92 km) |
| Welwyn Garden City to Omegna | 565.57 mi (910.19 km) |
| Welwyn Garden City to Opera | 616.98 mi (992.94 km) |
| Welwyn Garden City to Oppeano | 686.21 mi (1,104.35 km) |
| Welwyn Garden City to Orbassano | 587.85 mi (946.05 km) |
