| Cities | Distance |
|---|---|
| Grefrath to Oria | 922.51 mi (1,484.63 km) |
| Grefrath to Oristano | 797.12 mi (1,282.85 km) |
| Grefrath to Orta Nova | 821.79 mi (1,322.54 km) |
| Grefrath to Orte | 675.87 mi (1,087.70 km) |
| Grefrath to Ortona | 727.42 mi (1,170.66 km) |
| Grefrath to Orvieto | 654.02 mi (1,052.54 km) |
| Grefrath to Orzinuovi | 441.93 mi (711.22 km) |
| Grefrath to Osimo | 636.45 mi (1,024.27 km) |
| Grefrath to Ospitaletto | 434.37 mi (699.06 km) |
| Grefrath to Ostuni | 907.47 mi (1,460.43 km) |
| Grefrath to Ottaviano | 821.59 mi (1,322.23 km) |
| Grefrath to Ovada | 474.78 mi (764.09 km) |
| Grefrath to Ozieri | 753.64 mi (1,212.87 km) |
| Grefrath to Paceco | 970.88 mi (1,562.48 km) |
| Grefrath to Pachino | 1,097.99 mi (1,767.05 km) |