| Saint-Nazaire to Oria | 1,089.40 mi (1,753.22 km) |
| Saint-Nazaire to Oristano | 741.38 mi (1,193.14 km) |
| Saint-Nazaire to Orta Nova | 973.85 mi (1,567.26 km) |
| Saint-Nazaire to Orte | 786.89 mi (1,266.37 km) |
| Saint-Nazaire to Ortona | 880.33 mi (1,416.75 km) |
| Saint-Nazaire to Orvieto | 765.89 mi (1,232.57 km) |
| Saint-Nazaire to Orzinuovi | 593.08 mi (954.47 km) |
| Saint-Nazaire to Osimo | 803.90 mi (1,293.75 km) |
| Saint-Nazaire to Ospitaletto | 596.56 mi (960.06 km) |
| Saint-Nazaire to Ostuni | 1,078.70 mi (1,736.00 km) |
| Saint-Nazaire to Ottaviano | 937.37 mi (1,508.56 km) |
| Saint-Nazaire to Ovada | 551.94 mi (888.27 km) |
| Saint-Nazaire to Ozieri | 723.41 mi (1,164.21 km) |
| Saint-Nazaire to Paceco | 984.65 mi (1,584.64 km) |
| Saint-Nazaire to Pachino | 1,145.47 mi (1,843.46 km) |
