| Castel San Giorgio to Popovo | 616.99 mi (992.95 km) |
| Castel San Giorgio to Provadia | 673.93 mi (1,084.59 km) |
| Castel San Giorgio to Radnevo | 589.84 mi (949.26 km) |
| Castel San Giorgio to Radomir | 442.76 mi (712.55 km) |
| Castel San Giorgio to Rakitovo | 493.19 mi (793.71 km) |
| Castel San Giorgio to Rakovski | 540.65 mi (870.10 km) |
| Castel San Giorgio to Razgrad | 633.70 mi (1,019.85 km) |
| Castel San Giorgio to Razlog | 460.92 mi (741.77 km) |
| Castel San Giorgio to Ruse | 611.62 mi (984.31 km) |
| Castel San Giorgio to Samokov | 470.00 mi (756.39 km) |
| Castel San Giorgio to Sandanski | 449.42 mi (723.28 km) |
| Castel San Giorgio to Sevlievo | 557.02 mi (896.44 km) |
| Castel San Giorgio to Shumen | 650.45 mi (1,046.80 km) |
| Castel San Giorgio to Silistra | 679.68 mi (1,093.84 km) |
| Castel San Giorgio to Sliven | 613.48 mi (987.31 km) |
