| Arcata to Orbetello | 6,040.83 mi (9,721.78 km) |
| Arcata to Oria | 6,323.25 mi (10,176.29 km) |
| Arcata to Oristano | 6,113.42 mi (9,838.60 km) |
| Arcata to Orta Nova | 6,224.83 mi (10,017.89 km) |
| Arcata to Orte | 6,071.14 mi (9,770.55 km) |
| Arcata to Ortona | 6,130.23 mi (9,865.66 km) |
| Arcata to Orvieto | 6,048.61 mi (9,734.29 km) |
| Arcata to Orzinuovi | 5,834.26 mi (9,389.33 km) |
| Arcata to Osimo | 6,039.22 mi (9,719.19 km) |
| Arcata to Ospitaletto | 5,828.97 mi (9,380.82 km) |
| Arcata to Ostuni | 6,307.78 mi (10,151.40 km) |
| Arcata to Ottaviano | 6,221.93 mi (10,013.23 km) |
| Arcata to Ovada | 5,843.36 mi (9,403.98 km) |
| Arcata to Ozieri | 6,086.41 mi (9,795.13 km) |
| Arcata to Paceco | 6,339.80 mi (10,202.92 km) |
