| Romanshorn to Devnya | 930.64 mi (1,497.73 km) |
| Romanshorn to Dimitrovgrad | 880.41 mi (1,416.88 km) |
| Romanshorn to Dobrich | 932.85 mi (1,501.27 km) |
| Romanshorn to Dospat | 833.30 mi (1,341.06 km) |
| Romanshorn to Dupnitsa | 764.90 mi (1,230.99 km) |
| Romanshorn to Elhovo | 919.03 mi (1,479.04 km) |
| Romanshorn to Etropole | 782.66 mi (1,259.56 km) |
| Romanshorn to Gabrovo | 840.64 mi (1,352.89 km) |
| Romanshorn to Gorna Oryahovitsa | 848.58 mi (1,365.65 km) |
| Romanshorn to Gotse Delchev | 818.20 mi (1,316.76 km) |
| Romanshorn to Harmanli | 897.76 mi (1,444.81 km) |
| Romanshorn to Haskovo | 883.15 mi (1,421.29 km) |
| Romanshorn to Ihtiman | 788.58 mi (1,269.10 km) |
| Romanshorn to Isperih | 882.89 mi (1,420.87 km) |
| Romanshorn to Kardzhali | 884.89 mi (1,424.09 km) |
