| Bethesda to Orbetello | 4,409.27 mi (7,096.03 km) |
| Bethesda to Oria | 4,762.10 mi (7,663.86 km) |
| Bethesda to Oristano | 4,378.52 mi (7,046.56 km) |
| Bethesda to Orta Nova | 4,646.71 mi (7,478.16 km) |
| Bethesda to Orte | 4,460.19 mi (7,177.98 km) |
| Bethesda to Ortona | 4,552.09 mi (7,325.88 km) |
| Bethesda to Orvieto | 4,439.06 mi (7,143.97 km) |
| Bethesda to Orzinuovi | 4,254.32 mi (6,846.66 km) |
| Bethesda to Osimo | 4,471.86 mi (7,196.76 km) |
| Bethesda to Ospitaletto | 4,255.26 mi (6,848.18 km) |
| Bethesda to Ostuni | 4,750.94 mi (7,645.91 km) |
| Bethesda to Ottaviano | 4,610.32 mi (7,419.59 km) |
| Bethesda to Ovada | 4,223.33 mi (6,796.80 km) |
| Bethesda to Ozieri | 4,374.03 mi (7,039.31 km) |
| Bethesda to Paceco | 4,629.24 mi (7,450.04 km) |
