| Castellammare del Golfo to Opwijk | 989.90 mi (1,593.08 km) |
| Castellammare del Golfo to Ostend | 1,033.05 mi (1,662.53 km) |
| Castellammare del Golfo to Oud-Heverlee | 971.82 mi (1,564.00 km) |
| Castellammare del Golfo to Oud-Turnhout | 995.50 mi (1,602.10 km) |
| Castellammare del Golfo to Oudenaarde | 995.50 mi (1,602.10 km) |
| Castellammare del Golfo to Oudenburg | 1,028.71 mi (1,655.55 km) |
| Castellammare del Golfo to Oupeye | 945.24 mi (1,521.21 km) |
| Castellammare del Golfo to Overijse | 971.49 mi (1,563.46 km) |
| Castellammare del Golfo to Overpelt | 981.26 mi (1,579.19 km) |
| Castellammare del Golfo to Paal | 974.66 mi (1,568.57 km) |
| Castellammare del Golfo to Peer | 975.33 mi (1,569.64 km) |
| Castellammare del Golfo to Pepinster | 933.17 mi (1,501.79 km) |
| Castellammare del Golfo to Peruwelz | 976.15 mi (1,570.96 km) |
| Castellammare del Golfo to Perwez | 956.01 mi (1,538.55 km) |
| Castellammare del Golfo to Philippeville | 935.76 mi (1,505.96 km) |
