| Chalco to Orbetello | 5,100.23 mi (8,208.02 km) |
| Chalco to Oria | 5,433.52 mi (8,744.41 km) |
| Chalco to Oristano | 5,112.87 mi (8,228.36 km) |
| Chalco to Orta Nova | 5,321.87 mi (8,564.72 km) |
| Chalco to Orte | 5,143.80 mi (8,278.15 km) |
| Chalco to Ortona | 5,224.41 mi (8,407.88 km) |
| Chalco to Orvieto | 5,121.44 mi (8,242.16 km) |
| Chalco to Orzinuovi | 4,918.20 mi (7,915.08 km) |
| Chalco to Osimo | 5,137.11 mi (8,267.38 km) |
| Chalco to Ospitaletto | 4,916.46 mi (7,912.28 km) |
| Chalco to Ostuni | 5,420.22 mi (8,722.99 km) |
| Chalco to Ottaviano | 5,298.62 mi (8,527.31 km) |
| Chalco to Ovada | 4,903.73 mi (7,891.80 km) |
| Chalco to Ozieri | 5,098.64 mi (8,205.46 km) |
| Chalco to Paceco | 5,359.82 mi (8,625.80 km) |
