| Luton to Popovo | 1,363.62 mi (2,194.53 km) |
| Luton to Provadia | 1,419.75 mi (2,284.87 km) |
| Luton to Radnevo | 1,394.17 mi (2,243.70 km) |
| Luton to Radomir | 1,263.68 mi (2,033.69 km) |
| Luton to Rakitovo | 1,333.35 mi (2,145.83 km) |
| Luton to Rakovski | 1,355.52 mi (2,181.50 km) |
| Luton to Razgrad | 1,368.12 mi (2,201.77 km) |
| Luton to Razlog | 1,313.32 mi (2,113.58 km) |
| Luton to Ruse | 1,333.60 mi (2,146.22 km) |
| Luton to Samokov | 1,296.96 mi (2,087.25 km) |
| Luton to Sandanski | 1,320.15 mi (2,124.58 km) |
| Luton to Sevlievo | 1,330.77 mi (2,141.66 km) |
| Luton to Shumen | 1,395.14 mi (2,245.25 km) |
| Luton to Silistra | 1,376.73 mi (2,215.63 km) |
| Luton to Sliven | 1,394.57 mi (2,244.34 km) |
