| Chattanooga to Orbetello | 4,930.06 mi (7,934.17 km) |
| Chattanooga to Oria | 5,281.87 mi (8,500.35 km) |
| Chattanooga to Oristano | 4,901.62 mi (7,888.39 km) |
| Chattanooga to Orta Nova | 5,166.62 mi (8,314.87 km) |
| Chattanooga to Orte | 4,980.50 mi (8,015.34 km) |
| Chattanooga to Ortona | 5,071.61 mi (8,161.96 km) |
| Chattanooga to Orvieto | 4,959.24 mi (7,981.12 km) |
| Chattanooga to Orzinuovi | 4,772.51 mi (7,680.61 km) |
| Chattanooga to Osimo | 4,990.60 mi (8,031.59 km) |
| Chattanooga to Ospitaletto | 4,773.19 mi (7,681.70 km) |
| Chattanooga to Ostuni | 5,270.52 mi (8,482.08 km) |
| Chattanooga to Ottaviano | 5,131.19 mi (8,257.86 km) |
| Chattanooga to Ovada | 4,743.00 mi (7,633.12 km) |
| Chattanooga to Ozieri | 4,896.75 mi (7,880.56 km) |
| Chattanooga to Paceco | 5,152.35 mi (8,291.91 km) |
