| Stockton-on-Tees to Orbetello | 1,012.39 mi (1,629.29 km) |
| Stockton-on-Tees to Oria | 1,305.68 mi (2,101.29 km) |
| Stockton-on-Tees to Oristano | 1,112.26 mi (1,790.02 km) |
| Stockton-on-Tees to Orta Nova | 1,201.01 mi (1,932.84 km) |
| Stockton-on-Tees to Orte | 1,041.84 mi (1,676.68 km) |
| Stockton-on-Tees to Ortona | 1,104.69 mi (1,777.83 km) |
| Stockton-on-Tees to Orvieto | 1,019.29 mi (1,640.39 km) |
| Stockton-on-Tees to Orzinuovi | 805.04 mi (1,295.59 km) |
| Stockton-on-Tees to Osimo | 1,013.98 mi (1,631.84 km) |
| Stockton-on-Tees to Ospitaletto | 800.03 mi (1,287.52 km) |
| Stockton-on-Tees to Ostuni | 1,291.06 mi (2,077.77 km) |
| Stockton-on-Tees to Ottaviano | 1,193.41 mi (1,920.60 km) |
| Stockton-on-Tees to Ovada | 816.76 mi (1,314.44 km) |
| Stockton-on-Tees to Ozieri | 1,076.83 mi (1,733.00 km) |
| Stockton-on-Tees to Paceco | 1,318.26 mi (2,121.54 km) |
