| Romanshorn to Montalegre | 928.31 mi (1,493.97 km) |
| Romanshorn to Montemor-o-Novo | 1,075.38 mi (1,730.66 km) |
| Romanshorn to Montemor-o-Velho | 1,030.19 mi (1,657.93 km) |
| Romanshorn to Montijo | 1,102.07 mi (1,773.61 km) |
| Romanshorn to Mortagua | 1,000.19 mi (1,609.65 km) |
| Romanshorn to Moura | 1,068.20 mi (1,719.10 km) |
| Romanshorn to Murtosa | 1,005.67 mi (1,618.47 km) |
| Romanshorn to Nazare | 1,069.77 mi (1,721.63 km) |
| Romanshorn to Nelas | 980.43 mi (1,577.85 km) |
| Romanshorn to Obidos | 1,083.76 mi (1,744.14 km) |
| Romanshorn to Odemira | 1,141.35 mi (1,836.83 km) |
| Romanshorn to Odivelas | 1,109.02 mi (1,784.80 km) |
| Romanshorn to Oeiras | 1,119.42 mi (1,801.53 km) |
| Romanshorn to Olhao | 1,136.82 mi (1,829.53 km) |
| Romanshorn to Oliveira de Azemeis | 994.68 mi (1,600.79 km) |
