| Knottingley to Orbetello | 964.93 mi (1,552.91 km) |
| Knottingley to Oria | 1,265.53 mi (2,036.68 km) |
| Knottingley to Oristano | 1,058.64 mi (1,703.71 km) |
| Knottingley to Orta Nova | 1,159.17 mi (1,865.50 km) |
| Knottingley to Orte | 996.34 mi (1,603.45 km) |
| Knottingley to Ortona | 1,062.33 mi (1,709.65 km) |
| Knottingley to Orvieto | 973.71 mi (1,567.03 km) |
| Knottingley to Orzinuovi | 760.13 mi (1,223.30 km) |
| Knottingley to Osimo | 972.00 mi (1,564.28 km) |
| Knottingley to Ospitaletto | 755.72 mi (1,216.21 km) |
| Knottingley to Ostuni | 1,251.18 mi (2,013.58 km) |
| Knottingley to Ottaviano | 1,148.99 mi (1,849.12 km) |
| Knottingley to Ovada | 767.98 mi (1,235.94 km) |
| Knottingley to Ozieri | 1,024.20 mi (1,648.29 km) |
| Knottingley to Paceco | 1,268.21 mi (2,040.99 km) |
