| Vila Nova de Gaia to Orbetello | 1,023.20 mi (1,646.69 km) |
| Vila Nova de Gaia to Oria | 1,368.11 mi (2,201.76 km) |
| Vila Nova de Gaia to Oristano | 906.32 mi (1,458.59 km) |
| Vila Nova de Gaia to Orta Nova | 1,260.03 mi (2,027.82 km) |
| Vila Nova de Gaia to Orte | 1,082.95 mi (1,742.84 km) |
| Vila Nova de Gaia to Ortona | 1,185.95 mi (1,908.60 km) |
| Vila Nova de Gaia to Orvieto | 1,068.40 mi (1,719.42 km) |
| Vila Nova de Gaia to Orzinuovi | 976.15 mi (1,570.96 km) |
| Vila Nova de Gaia to Osimo | 1,137.42 mi (1,830.50 km) |
| Vila Nova de Gaia to Ospitaletto | 984.89 mi (1,585.02 km) |
| Vila Nova de Gaia to Ostuni | 1,362.69 mi (2,193.04 km) |
| Vila Nova de Gaia to Ottaviano | 1,201.03 mi (1,932.86 km) |
| Vila Nova de Gaia to Ovada | 904.94 mi (1,456.36 km) |
| Vila Nova de Gaia to Ozieri | 919.97 mi (1,480.55 km) |
| Vila Nova de Gaia to Paceco | 1,145.35 mi (1,843.26 km) |
