| Barrhead to Popovo | 1,599.48 mi (2,574.11 km) |
| Barrhead to Provadia | 1,651.42 mi (2,657.70 km) |
| Barrhead to Radnevo | 1,639.17 mi (2,637.98 km) |
| Barrhead to Radomir | 1,520.67 mi (2,447.28 km) |
| Barrhead to Rakitovo | 1,588.93 mi (2,557.14 km) |
| Barrhead to Rakovski | 1,605.01 mi (2,583.02 km) |
| Barrhead to Razgrad | 1,601.23 mi (2,576.93 km) |
| Barrhead to Razlog | 1,572.36 mi (2,530.46 km) |
| Barrhead to Ruse | 1,566.98 mi (2,521.81 km) |
| Barrhead to Samokov | 1,552.60 mi (2,498.66 km) |
| Barrhead to Sandanski | 1,582.01 mi (2,546.00 km) |
| Barrhead to Sevlievo | 1,574.28 mi (2,533.56 km) |
| Barrhead to Shumen | 1,628.30 mi (2,620.50 km) |
| Barrhead to Silistra | 1,601.65 mi (2,577.61 km) |
| Barrhead to Sliven | 1,635.00 mi (2,631.28 km) |
