| San Felice Circeo to Popovo | 686.39 mi (1,104.64 km) |
| San Felice Circeo to Provadia | 745.03 mi (1,199.01 km) |
| San Felice Circeo to Radnevo | 665.00 mi (1,070.22 km) |
| San Felice Circeo to Radomir | 514.60 mi (828.17 km) |
| San Felice Circeo to Rakitovo | 569.58 mi (916.65 km) |
| San Felice Circeo to Rakovski | 615.55 mi (990.63 km) |
| San Felice Circeo to Razgrad | 702.26 mi (1,130.17 km) |
| San Felice Circeo to Razlog | 537.73 mi (865.38 km) |
| San Felice Circeo to Ruse | 677.89 mi (1,090.95 km) |
| San Felice Circeo to Samokov | 543.87 mi (875.27 km) |
| San Felice Circeo to Sandanski | 528.13 mi (849.95 km) |
| San Felice Circeo to Sevlievo | 627.52 mi (1,009.89 km) |
| San Felice Circeo to Shumen | 720.73 mi (1,159.90 km) |
| San Felice Circeo to Silistra | 745.51 mi (1,199.78 km) |
| San Felice Circeo to Sliven | 686.73 mi (1,105.18 km) |
