| Ardrossan to Popovo | 1,611.37 mi (2,593.25 km) |
| Ardrossan to Provadia | 1,663.63 mi (2,677.35 km) |
| Ardrossan to Radnevo | 1,650.43 mi (2,656.10 km) |
| Ardrossan to Radomir | 1,530.90 mi (2,463.74 km) |
| Ardrossan to Rakitovo | 1,599.33 mi (2,573.87 km) |
| Ardrossan to Rakovski | 1,615.91 mi (2,600.55 km) |
| Ardrossan to Razgrad | 1,613.31 mi (2,596.37 km) |
| Ardrossan to Razlog | 1,582.45 mi (2,546.70 km) |
| Ardrossan to Ruse | 1,579.02 mi (2,541.18 km) |
| Ardrossan to Samokov | 1,562.96 mi (2,515.34 km) |
| Ardrossan to Sandanski | 1,591.86 mi (2,561.85 km) |
| Ardrossan to Sevlievo | 1,585.61 mi (2,551.79 km) |
| Ardrossan to Shumen | 1,640.40 mi (2,639.96 km) |
| Ardrossan to Silistra | 1,614.27 mi (2,597.91 km) |
| Ardrossan to Sliven | 1,646.60 mi (2,649.94 km) |
