| Longmont to Popovo | 5,918.04 mi (9,524.16 km) |
| Longmont to Provadia | 5,961.91 mi (9,594.76 km) |
| Longmont to Radnevo | 5,968.55 mi (9,605.45 km) |
| Longmont to Radomir | 5,864.70 mi (9,438.33 km) |
| Longmont to Rakitovo | 5,930.77 mi (9,544.65 km) |
| Longmont to Rakovski | 5,940.42 mi (9,560.18 km) |
| Longmont to Razgrad | 5,915.83 mi (9,520.61 km) |
| Longmont to Razlog | 5,917.41 mi (9,523.14 km) |
| Longmont to Ruse | 5,883.27 mi (9,468.21 km) |
| Longmont to Samokov | 5,895.02 mi (9,487.12 km) |
| Longmont to Sandanski | 5,929.12 mi (9,542.00 km) |
| Longmont to Sevlievo | 5,903.54 mi (9,500.83 km) |
| Longmont to Shumen | 5,941.95 mi (9,562.65 km) |
| Longmont to Silistra | 5,903.80 mi (9,501.25 km) |
| Longmont to Sliven | 5,958.63 mi (9,589.50 km) |
