| Dumbarton to Popovo | 1,609.42 mi (2,590.12 km) |
| Dumbarton to Provadia | 1,661.21 mi (2,673.46 km) |
| Dumbarton to Radnevo | 1,649.40 mi (2,654.45 km) |
| Dumbarton to Radomir | 1,531.32 mi (2,464.42 km) |
| Dumbarton to Rakitovo | 1,599.52 mi (2,574.18 km) |
| Dumbarton to Rakovski | 1,615.40 mi (2,599.74 km) |
| Dumbarton to Razgrad | 1,611.08 mi (2,592.79 km) |
| Dumbarton to Razlog | 1,583.06 mi (2,547.68 km) |
| Dumbarton to Ruse | 1,576.86 mi (2,537.70 km) |
| Dumbarton to Samokov | 1,563.19 mi (2,515.72 km) |
| Dumbarton to Sandanski | 1,592.80 mi (2,563.36 km) |
| Dumbarton to Sevlievo | 1,584.49 mi (2,549.98 km) |
| Dumbarton to Shumen | 1,638.15 mi (2,636.35 km) |
| Dumbarton to Silistra | 1,611.24 mi (2,593.04 km) |
| Dumbarton to Sliven | 1,645.09 mi (2,647.51 km) |
