| Belfast to Noventa Vicentina | 1,003.69 mi (1,615.28 km) |
| Belfast to Novi di Modena | 1,002.39 mi (1,613.19 km) |
| Belfast to Novi Ligure | 942.31 mi (1,516.51 km) |
| Belfast to Nuoro | 1,211.70 mi (1,950.04 km) |
| Belfast to Occhiobello | 1,023.45 mi (1,647.08 km) |
| Belfast to Oderzo | 1,012.35 mi (1,629.22 km) |
| Belfast to Oggiono | 906.25 mi (1,458.47 km) |
| Belfast to Olbia | 1,180.68 mi (1,900.12 km) |
| Belfast to Oleggio | 892.83 mi (1,436.88 km) |
| Belfast to Olgiate Comasco | 893.89 mi (1,438.58 km) |
| Belfast to Olgiate Olona | 899.00 mi (1,446.81 km) |
| Belfast to Omegna | 871.16 mi (1,402.00 km) |
| Belfast to Opera | 922.63 mi (1,484.83 km) |
| Belfast to Oppeano | 991.11 mi (1,595.03 km) |
| Belfast to Orbassano | 891.22 mi (1,434.29 km) |
