| Celbridge to Oria | 1,433.05 mi (2,306.27 km) |
| Celbridge to Oristano | 1,168.30 mi (1,880.20 km) |
| Celbridge to Orta Nova | 1,322.26 mi (2,127.96 km) |
| Celbridge to Orte | 1,148.36 mi (1,848.11 km) |
| Celbridge to Ortona | 1,224.71 mi (1,970.98 km) |
| Celbridge to Orvieto | 1,125.75 mi (1,811.72 km) |
| Celbridge to Orzinuovi | 918.39 mi (1,478.00 km) |
| Celbridge to Osimo | 1,136.68 mi (1,829.31 km) |
| Celbridge to Ospitaletto | 916.19 mi (1,474.47 km) |
| Celbridge to Ostuni | 1,419.61 mi (2,284.64 km) |
| Celbridge to Ottaviano | 1,303.28 mi (2,097.43 km) |
| Celbridge to Ovada | 910.58 mi (1,465.43 km) |
| Celbridge to Ozieri | 1,141.02 mi (1,836.30 km) |
| Celbridge to Paceco | 1,396.44 mi (2,247.36 km) |
| Celbridge to Pachino | 1,548.32 mi (2,491.77 km) |
