| Belfast to Popovo | 1,632.74 mi (2,627.64 km) |
| Belfast to Provadia | 1,686.59 mi (2,714.30 km) |
| Belfast to Radnevo | 1,668.49 mi (2,685.17 km) |
| Belfast to Radomir | 1,544.00 mi (2,484.83 km) |
| Belfast to Rakitovo | 1,613.12 mi (2,596.06 km) |
| Belfast to Rakovski | 1,632.17 mi (2,626.73 km) |
| Belfast to Razgrad | 1,635.66 mi (2,632.34 km) |
| Belfast to Razlog | 1,594.77 mi (2,566.53 km) |
| Belfast to Ruse | 1,601.21 mi (2,576.89 km) |
| Belfast to Samokov | 1,576.67 mi (2,537.41 km) |
| Belfast to Sandanski | 1,602.99 mi (2,579.76 km) |
| Belfast to Sevlievo | 1,604.12 mi (2,581.59 km) |
| Belfast to Shumen | 1,662.78 mi (2,675.99 km) |
| Belfast to Silistra | 1,639.44 mi (2,638.43 km) |
| Belfast to Sliven | 1,666.37 mi (2,681.76 km) |
