| Llantrisant to Orbetello | 928.67 mi (1,494.54 km) |
| Llantrisant to Oria | 1,256.50 mi (2,022.14 km) |
| Llantrisant to Oristano | 987.00 mi (1,588.42 km) |
| Llantrisant to Orta Nova | 1,144.67 mi (1,842.16 km) |
| Llantrisant to Orte | 968.65 mi (1,558.90 km) |
| Llantrisant to Ortona | 1,047.19 mi (1,685.30 km) |
| Llantrisant to Orvieto | 946.10 mi (1,522.60 km) |
| Llantrisant to Orzinuovi | 741.01 mi (1,192.54 km) |
| Llantrisant to Osimo | 960.14 mi (1,545.20 km) |
| Llantrisant to Ospitaletto | 739.47 mi (1,190.06 km) |
| Llantrisant to Ostuni | 1,243.39 mi (2,001.04 km) |
| Llantrisant to Ottaviano | 1,123.67 mi (1,808.37 km) |
| Llantrisant to Ovada | 729.99 mi (1,174.81 km) |
| Llantrisant to Ozieri | 959.19 mi (1,543.66 km) |
| Llantrisant to Paceco | 1,214.39 mi (1,954.37 km) |
