| Louth to Popovo | 1,377.78 mi (2,217.32 km) |
| Louth to Provadia | 1,431.86 mi (2,304.36 km) |
| Louth to Radnevo | 1,413.35 mi (2,274.57 km) |
| Louth to Radomir | 1,289.46 mi (2,075.18 km) |
| Louth to Rakitovo | 1,358.45 mi (2,186.21 km) |
| Louth to Rakovski | 1,377.14 mi (2,216.29 km) |
| Louth to Razgrad | 1,380.84 mi (2,222.24 km) |
| Louth to Razlog | 1,340.43 mi (2,157.22 km) |
| Louth to Ruse | 1,346.37 mi (2,166.77 km) |
| Louth to Samokov | 1,322.01 mi (2,127.57 km) |
| Louth to Sandanski | 1,349.00 mi (2,171.00 km) |
| Louth to Sevlievo | 1,348.98 mi (2,170.97 km) |
| Louth to Shumen | 1,407.96 mi (2,265.89 km) |
| Louth to Silistra | 1,385.27 mi (2,229.38 km) |
| Louth to Sliven | 1,411.25 mi (2,271.20 km) |
