| Union to Popovo | 5,557.44 mi (8,943.84 km) |
| Union to Provadia | 5,608.01 mi (9,025.23 km) |
| Union to Radnevo | 5,598.03 mi (9,009.16 km) |
| Union to Radomir | 5,476.78 mi (8,814.02 km) |
| Union to Rakitovo | 5,545.74 mi (8,925.01 km) |
| Union to Rakovski | 5,563.45 mi (8,953.51 km) |
| Union to Razgrad | 5,558.49 mi (8,945.53 km) |
| Union to Razlog | 5,527.65 mi (8,895.89 km) |
| Union to Ruse | 5,524.45 mi (8,890.75 km) |
| Union to Samokov | 5,509.31 mi (8,866.38 km) |
| Union to Sandanski | 5,535.77 mi (8,908.96 km) |
| Union to Sevlievo | 5,533.15 mi (8,904.75 km) |
| Union to Shumen | 5,585.48 mi (8,988.96 km) |
| Union to Silistra | 5,555.80 mi (8,941.20 km) |
| Union to Sliven | 5,593.65 mi (9,002.12 km) |
