| Thornton Heath to Orbetello | 815.90 mi (1,313.06 km) |
| Thornton Heath to Oria | 1,131.99 mi (1,821.77 km) |
| Thornton Heath to Oristano | 897.03 mi (1,443.63 km) |
| Thornton Heath to Orta Nova | 1,022.13 mi (1,644.97 km) |
| Thornton Heath to Orte | 851.60 mi (1,370.52 km) |
| Thornton Heath to Ortona | 924.63 mi (1,488.05 km) |
| Thornton Heath to Orvieto | 828.92 mi (1,334.02 km) |
| Thornton Heath to Orzinuovi | 618.74 mi (995.76 km) |
| Thornton Heath to Osimo | 835.87 mi (1,345.21 km) |
| Thornton Heath to Ospitaletto | 615.91 mi (991.22 km) |
| Thornton Heath to Ostuni | 1,118.35 mi (1,799.82 km) |
| Thornton Heath to Ottaviano | 1,005.99 mi (1,618.99 km) |
| Thornton Heath to Ovada | 617.14 mi (993.19 km) |
| Thornton Heath to Ozieri | 864.36 mi (1,391.05 km) |
| Thornton Heath to Paceco | 1,112.75 mi (1,790.79 km) |
