| Echelon to Orbetello | 4,282.05 mi (6,891.30 km) |
| Echelon to Oria | 4,635.15 mi (7,459.55 km) |
| Echelon to Oristano | 4,250.67 mi (6,840.80 km) |
| Echelon to Orta Nova | 4,519.73 mi (7,273.81 km) |
| Echelon to Orte | 4,333.11 mi (6,973.47 km) |
| Echelon to Ortona | 4,425.22 mi (7,121.70 km) |
| Echelon to Orvieto | 4,312.01 mi (6,939.52 km) |
| Echelon to Orzinuovi | 4,127.82 mi (6,643.09 km) |
| Echelon to Osimo | 4,345.20 mi (6,992.92 km) |
| Echelon to Ospitaletto | 4,128.84 mi (6,644.72 km) |
| Echelon to Ostuni | 4,624.05 mi (7,441.69 km) |
| Echelon to Ottaviano | 4,483.08 mi (7,214.82 km) |
| Echelon to Ovada | 4,096.44 mi (6,592.58 km) |
| Echelon to Ozieri | 4,246.28 mi (6,833.73 km) |
| Echelon to Paceco | 4,501.38 mi (7,244.28 km) |
