| Killarney to Octeville | 381.76 mi (614.39 km) |
| Killarney to Oignies | 550.77 mi (886.38 km) |
| Killarney to Oissel | 499.78 mi (804.31 km) |
| Killarney to Olivet | 583.10 mi (938.41 km) |
| Killarney to Ollioules | 940.80 mi (1,514.06 km) |
| Killarney to Olonne-sur-Mer | 516.21 mi (830.76 km) |
| Killarney to Oloron-Sainte-Marie | 738.34 mi (1,188.25 km) |
| Killarney to Onet Village | 768.17 mi (1,236.26 km) |
| Killarney to Onnaing | 577.88 mi (930.01 km) |
| Killarney to Orange | 855.21 mi (1,376.33 km) |
| Killarney to Orchies | 561.24 mi (903.23 km) |
| Killarney to Orleans | 581.94 mi (936.54 km) |
| Killarney to Orly | 571.07 mi (919.05 km) |
| Killarney to Ormesson-sur-Marne | 575.57 mi (926.29 km) |
| Killarney to Orsay | 564.34 mi (908.22 km) |
