| Arendal to Orbetello | 1,112.01 mi (1,789.60 km) |
| Arendal to Oria | 1,300.61 mi (2,093.13 km) |
| Arendal to Oristano | 1,282.05 mi (2,063.26 km) |
| Arendal to Orta Nova | 1,221.71 mi (1,966.15 km) |
| Arendal to Orte | 1,116.53 mi (1,796.88 km) |
| Arendal to Ortona | 1,139.48 mi (1,833.82 km) |
| Arendal to Orvieto | 1,097.21 mi (1,765.79 km) |
| Arendal to Orzinuovi | 903.75 mi (1,454.44 km) |
| Arendal to Osimo | 1,054.36 mi (1,696.82 km) |
| Arendal to Ospitaletto | 893.37 mi (1,437.74 km) |
| Arendal to Ostuni | 1,284.35 mi (2,066.96 km) |
| Arendal to Ottaviano | 1,242.23 mi (1,999.17 km) |
| Arendal to Ovada | 954.99 mi (1,536.91 km) |
| Arendal to Ozieri | 1,235.15 mi (1,987.78 km) |
| Arendal to Paceco | 1,424.99 mi (2,293.30 km) |
