| Solon to Popovo | 5,061.04 mi (8,144.95 km) |
| Solon to Provadia | 5,113.58 mi (8,229.51 km) |
| Solon to Radnevo | 5,098.00 mi (8,204.43 km) |
| Solon to Radomir | 4,971.79 mi (8,001.32 km) |
| Solon to Rakitovo | 5,041.28 mi (8,113.15 km) |
| Solon to Rakovski | 5,061.50 mi (8,145.69 km) |
| Solon to Razgrad | 5,063.21 mi (8,148.44 km) |
| Solon to Razlog | 5,021.77 mi (8,081.75 km) |
| Solon to Ruse | 5,028.88 mi (8,093.21 km) |
| Solon to Samokov | 5,004.84 mi (8,054.51 km) |
| Solon to Sandanski | 5,028.71 mi (8,092.93 km) |
| Solon to Sevlievo | 5,033.58 mi (8,100.76 km) |
| Solon to Shumen | 5,090.30 mi (8,192.05 km) |
| Solon to Silistra | 5,063.81 mi (8,149.41 km) |
| Solon to Sliven | 5,095.51 mi (8,200.43 km) |
