| Klamath Falls to Orbetello | 5,898.18 mi (9,492.21 km) |
| Klamath Falls to Oria | 6,183.64 mi (9,951.60 km) |
| Klamath Falls to Oristano | 5,968.26 mi (9,604.99 km) |
| Klamath Falls to Orta Nova | 6,084.34 mi (9,791.80 km) |
| Klamath Falls to Orte | 5,929.16 mi (9,542.06 km) |
| Klamath Falls to Ortona | 5,989.41 mi (9,639.03 km) |
| Klamath Falls to Orvieto | 5,906.60 mi (9,505.75 km) |
| Klamath Falls to Orzinuovi | 5,692.38 mi (9,160.99 km) |
| Klamath Falls to Osimo | 5,898.41 mi (9,492.57 km) |
| Klamath Falls to Ospitaletto | 5,687.25 mi (9,152.74 km) |
| Klamath Falls to Ostuni | 6,168.25 mi (9,926.84 km) |
| Klamath Falls to Ottaviano | 6,080.43 mi (9,785.51 km) |
| Klamath Falls to Ovada | 5,700.41 mi (9,173.92 km) |
| Klamath Falls to Ozieri | 5,941.75 mi (9,562.32 km) |
| Klamath Falls to Paceco | 6,195.86 mi (9,971.27 km) |
