| Champaign to Orbetello | 4,837.58 mi (7,785.33 km) |
| Champaign to Oria | 5,180.99 mi (8,338.00 km) |
| Champaign to Oristano | 4,831.48 mi (7,775.51 km) |
| Champaign to Orta Nova | 5,067.16 mi (8,154.81 km) |
| Champaign to Orte | 4,884.54 mi (7,860.91 km) |
| Champaign to Ortona | 4,970.44 mi (7,999.15 km) |
| Champaign to Orvieto | 4,862.60 mi (7,825.60 km) |
| Champaign to Orzinuovi | 4,666.24 mi (7,509.58 km) |
| Champaign to Osimo | 4,885.74 mi (7,862.83 km) |
| Champaign to Ospitaletto | 4,665.63 mi (7,508.61 km) |
| Champaign to Ostuni | 5,168.55 mi (8,317.98 km) |
| Champaign to Ottaviano | 5,038.10 mi (8,108.04 km) |
| Champaign to Ovada | 4,644.61 mi (7,474.78 km) |
| Champaign to Ozieri | 4,821.41 mi (7,759.31 km) |
| Champaign to Paceco | 5,081.16 mi (8,177.34 km) |
