| Ludlow to Popovo | 1,466.65 mi (2,360.35 km) |
| Ludlow to Provadia | 1,522.61 mi (2,450.41 km) |
| Ludlow to Radnevo | 1,497.50 mi (2,409.99 km) |
| Ludlow to Radomir | 1,367.05 mi (2,200.05 km) |
| Ludlow to Rakitovo | 1,436.73 mi (2,312.19 km) |
| Ludlow to Rakovski | 1,458.91 mi (2,347.88 km) |
| Ludlow to Razgrad | 1,471.02 mi (2,367.38 km) |
| Ludlow to Razlog | 1,416.64 mi (2,279.86 km) |
| Ludlow to Ruse | 1,436.50 mi (2,311.83 km) |
| Ludlow to Samokov | 1,400.34 mi (2,253.62 km) |
| Ludlow to Sandanski | 1,423.39 mi (2,290.73 km) |
| Ludlow to Sevlievo | 1,434.05 mi (2,307.88 km) |
| Ludlow to Shumen | 1,498.06 mi (2,410.89 km) |
| Ludlow to Silistra | 1,479.17 mi (2,380.49 km) |
| Ludlow to Sliven | 1,497.78 mi (2,410.45 km) |
