| Helensburgh to Popovo | 1,617.04 mi (2,602.37 km) |
| Helensburgh to Provadia | 1,668.77 mi (2,685.63 km) |
| Helensburgh to Radnevo | 1,657.09 mi (2,666.82 km) |
| Helensburgh to Radomir | 1,539.11 mi (2,476.96 km) |
| Helensburgh to Rakitovo | 1,607.30 mi (2,586.70 km) |
| Helensburgh to Rakovski | 1,623.13 mi (2,612.18 km) |
| Helensburgh to Razgrad | 1,618.67 mi (2,604.99 km) |
| Helensburgh to Razlog | 1,590.86 mi (2,560.24 km) |
| Helensburgh to Ruse | 1,584.45 mi (2,549.92 km) |
| Helensburgh to Samokov | 1,570.97 mi (2,528.24 km) |
| Helensburgh to Sandanski | 1,600.62 mi (2,575.95 km) |
| Helensburgh to Sevlievo | 1,592.17 mi (2,562.35 km) |
| Helensburgh to Shumen | 1,645.73 mi (2,648.55 km) |
| Helensburgh to Silistra | 1,618.74 mi (2,605.11 km) |
| Helensburgh to Sliven | 1,652.74 mi (2,659.82 km) |
