| Oulu to Popovo | 1,497.14 mi (2,409.42 km) |
| Oulu to Provadia | 1,510.29 mi (2,430.58 km) |
| Oulu to Radnevo | 1,569.50 mi (2,525.87 km) |
| Oulu to Radomir | 1,555.25 mi (2,502.93 km) |
| Oulu to Rakitovo | 1,592.21 mi (2,562.42 km) |
| Oulu to Rakovski | 1,570.33 mi (2,527.19 km) |
| Oulu to Razgrad | 1,484.74 mi (2,389.45 km) |
| Oulu to Razlog | 1,600.13 mi (2,575.16 km) |
| Oulu to Ruse | 1,464.28 mi (2,356.53 km) |
| Oulu to Samokov | 1,568.63 mi (2,524.46 km) |
| Oulu to Sandanski | 1,622.26 mi (2,610.78 km) |
| Oulu to Sevlievo | 1,519.33 mi (2,445.12 km) |
| Oulu to Shumen | 1,502.53 mi (2,418.09 km) |
| Oulu to Silistra | 1,445.48 mi (2,326.28 km) |
| Oulu to Sliven | 1,543.28 mi (2,483.67 km) |
