| Castelletto sopra Ticino to Popovo | 880.24 mi (1,416.62 km) |
| Castelletto sopra Ticino to Provadia | 941.35 mi (1,514.95 km) |
| Castelletto sopra Ticino to Radnevo | 889.54 mi (1,431.58 km) |
| Castelletto sopra Ticino to Radomir | 741.72 mi (1,193.69 km) |
| Castelletto sopra Ticino to Rakitovo | 810.34 mi (1,304.12 km) |
| Castelletto sopra Ticino to Rakovski | 843.84 mi (1,358.02 km) |
| Castelletto sopra Ticino to Razgrad | 890.31 mi (1,432.82 km) |
| Castelletto sopra Ticino to Razlog | 784.29 mi (1,262.19 km) |
| Castelletto sopra Ticino to Ruse | 857.88 mi (1,380.63 km) |
| Castelletto sopra Ticino to Samokov | 775.86 mi (1,248.63 km) |
| Castelletto sopra Ticino to Sandanski | 785.10 mi (1,263.49 km) |
| Castelletto sopra Ticino to Sevlievo | 833.28 mi (1,341.04 km) |
| Castelletto sopra Ticino to Shumen | 915.26 mi (1,472.97 km) |
| Castelletto sopra Ticino to Silistra | 915.94 mi (1,474.07 km) |
| Castelletto sopra Ticino to Sliven | 899.41 mi (1,447.46 km) |
