| Llantwit Major to Orbetello | 926.53 mi (1,491.11 km) |
| Llantwit Major to Oria | 1,255.74 mi (2,020.91 km) |
| Llantwit Major to Oristano | 982.65 mi (1,581.42 km) |
| Llantwit Major to Orta Nova | 1,143.65 mi (1,840.53 km) |
| Llantwit Major to Orte | 967.00 mi (1,556.24 km) |
| Llantwit Major to Ortona | 1,046.22 mi (1,683.73 km) |
| Llantwit Major to Orvieto | 944.48 mi (1,519.99 km) |
| Llantwit Major to Orzinuovi | 740.17 mi (1,191.19 km) |
| Llantwit Major to Osimo | 959.45 mi (1,544.09 km) |
| Llantwit Major to Ospitaletto | 738.81 mi (1,189.00 km) |
| Llantwit Major to Ostuni | 1,242.71 mi (1,999.94 km) |
| Llantwit Major to Ottaviano | 1,122.02 mi (1,805.72 km) |
| Llantwit Major to Ovada | 728.02 mi (1,171.64 km) |
| Llantwit Major to Ozieri | 955.27 mi (1,537.36 km) |
| Llantwit Major to Paceco | 1,210.97 mi (1,948.86 km) |
