| Kirkwall to Popovo | 1,639.91 mi (2,639.19 km) |
| Kirkwall to Provadia | 1,686.78 mi (2,714.60 km) |
| Kirkwall to Radnevo | 1,687.90 mi (2,716.41 km) |
| Kirkwall to Radomir | 1,584.11 mi (2,549.38 km) |
| Kirkwall to Rakitovo | 1,649.57 mi (2,654.73 km) |
| Kirkwall to Rakovski | 1,658.98 mi (2,669.87 km) |
| Kirkwall to Razgrad | 1,638.97 mi (2,637.67 km) |
| Kirkwall to Razlog | 1,637.00 mi (2,634.50 km) |
| Kirkwall to Ruse | 1,605.69 mi (2,584.11 km) |
| Kirkwall to Samokov | 1,613.98 mi (2,597.45 km) |
| Kirkwall to Sandanski | 1,649.56 mi (2,654.70 km) |
| Kirkwall to Sevlievo | 1,622.77 mi (2,611.60 km) |
| Kirkwall to Shumen | 1,665.56 mi (2,680.45 km) |
| Kirkwall to Silistra | 1,631.63 mi (2,625.86 km) |
| Kirkwall to Sliven | 1,679.23 mi (2,702.47 km) |
