| Reading to Orbetello | 845.36 mi (1,360.47 km) |
| Reading to Oria | 1,164.96 mi (1,874.82 km) |
| Reading to Oristano | 920.11 mi (1,480.77 km) |
| Reading to Orta Nova | 1,054.50 mi (1,697.06 km) |
| Reading to Orte | 882.32 mi (1,419.96 km) |
| Reading to Ortona | 956.96 mi (1,540.08 km) |
| Reading to Orvieto | 859.66 mi (1,383.49 km) |
| Reading to Orzinuovi | 650.75 mi (1,047.28 km) |
| Reading to Osimo | 868.64 mi (1,397.95 km) |
| Reading to Ospitaletto | 648.30 mi (1,043.34 km) |
| Reading to Ostuni | 1,151.46 mi (1,853.10 km) |
| Reading to Ottaviano | 1,036.99 mi (1,668.87 km) |
| Reading to Ovada | 646.37 mi (1,040.23 km) |
| Reading to Ozieri | 888.77 mi (1,430.33 km) |
| Reading to Paceco | 1,139.32 mi (1,833.55 km) |
