| Idaho Falls to Orbetello | 5,538.78 mi (8,913.80 km) |
| Idaho Falls to Oria | 5,842.68 mi (9,402.89 km) |
| Idaho Falls to Oristano | 5,590.47 mi (8,997.00 km) |
| Idaho Falls to Orta Nova | 5,738.36 mi (9,234.99 km) |
| Idaho Falls to Orte | 5,574.20 mi (8,970.81 km) |
| Idaho Falls to Ortona | 5,641.78 mi (9,079.56 km) |
| Idaho Falls to Orvieto | 5,551.52 mi (8,934.31 km) |
| Idaho Falls to Orzinuovi | 5,339.14 mi (8,592.52 km) |
| Idaho Falls to Osimo | 5,551.24 mi (8,933.85 km) |
| Idaho Falls to Ospitaletto | 5,335.09 mi (8,586.00 km) |
| Idaho Falls to Ostuni | 5,827.87 mi (9,379.05 km) |
| Idaho Falls to Ottaviano | 5,727.91 mi (9,218.17 km) |
| Idaho Falls to Ovada | 5,339.80 mi (8,593.58 km) |
| Idaho Falls to Ozieri | 5,567.78 mi (8,960.48 km) |
| Idaho Falls to Paceco | 5,826.14 mi (9,376.27 km) |
