| Amarillo to Orbetello | 5,610.70 mi (9,029.54 km) |
| Amarillo to Oria | 5,946.22 mi (9,569.51 km) |
| Amarillo to Oristano | 5,618.15 mi (9,041.54 km) |
| Amarillo to Orta Nova | 5,834.11 mi (9,389.09 km) |
| Amarillo to Orte | 5,655.04 mi (9,100.90 km) |
| Amarillo to Ortona | 5,736.73 mi (9,232.38 km) |
| Amarillo to Orvieto | 5,632.75 mi (9,065.04 km) |
| Amarillo to Orzinuovi | 5,430.70 mi (8,739.87 km) |
| Amarillo to Osimo | 5,649.84 mi (9,092.54 km) |
| Amarillo to Ospitaletto | 5,429.16 mi (8,737.38 km) |
| Amarillo to Ostuni | 5,933.05 mi (9,548.32 km) |
| Amarillo to Ottaviano | 5,809.69 mi (9,349.79 km) |
| Amarillo to Ovada | 5,414.84 mi (8,714.35 km) |
| Amarillo to Ozieri | 5,605.24 mi (9,020.75 km) |
| Amarillo to Paceco | 5,866.17 mi (9,440.68 km) |
