| Romanshorn to Opole | 442.81 mi (712.64 km) |
| Romanshorn to Orzesze | 462.50 mi (744.32 km) |
| Romanshorn to Osowa | 617.05 mi (993.04 km) |
| Romanshorn to Ostroda | 628.09 mi (1,010.82 km) |
| Romanshorn to Ostroleka | 657.99 mi (1,058.94 km) |
| Romanshorn to Ostrow Mazowiecka | 661.09 mi (1,063.93 km) |
| Romanshorn to Ostrow Wielkopolski | 471.93 mi (759.50 km) |
| Romanshorn to Ostrowiec Swietokrzyski | 590.10 mi (949.68 km) |
| Romanshorn to Ostrzeszow | 467.56 mi (752.47 km) |
| Romanshorn to Oswiecim | 479.96 mi (772.42 km) |
| Romanshorn to Otwock | 615.85 mi (991.11 km) |
| Romanshorn to Ozarow Mazowiecki | 601.33 mi (967.75 km) |
| Romanshorn to Ozimek | 454.08 mi (730.78 km) |
| Romanshorn to Ozorkow | 536.70 mi (863.73 km) |
| Romanshorn to Pabianice | 529.66 mi (852.40 km) |
