| South Bend to Popovo | 5,223.95 mi (8,407.14 km) |
| South Bend to Provadia | 5,274.84 mi (8,489.03 km) |
| South Bend to Radnevo | 5,264.05 mi (8,471.67 km) |
| South Bend to Radomir | 5,142.21 mi (8,275.59 km) |
| South Bend to Rakitovo | 5,211.24 mi (8,386.68 km) |
| South Bend to Rakovski | 5,229.23 mi (8,415.63 km) |
| South Bend to Razgrad | 5,225.17 mi (8,409.10 km) |
| South Bend to Razlog | 5,193.00 mi (8,357.33 km) |
| South Bend to Ruse | 5,191.08 mi (8,354.24 km) |
| South Bend to Samokov | 5,174.80 mi (8,328.04 km) |
| South Bend to Sandanski | 5,201.03 mi (8,370.25 km) |
| South Bend to Sevlievo | 5,199.22 mi (8,367.33 km) |
| South Bend to Shumen | 5,252.18 mi (8,452.57 km) |
| South Bend to Silistra | 5,223.01 mi (8,405.62 km) |
| South Bend to Sliven | 5,259.92 mi (8,465.03 km) |
