| Delfzijl to Popovo | 1,117.62 mi (1,798.63 km) |
| Delfzijl to Provadia | 1,168.80 mi (1,881.01 km) |
| Delfzijl to Radnevo | 1,159.51 mi (1,866.05 km) |
| Delfzijl to Radomir | 1,047.00 mi (1,684.98 km) |
| Delfzijl to Rakitovo | 1,113.99 mi (1,792.79 km) |
| Delfzijl to Rakovski | 1,127.15 mi (1,813.97 km) |
| Delfzijl to Razgrad | 1,118.89 mi (1,800.69 km) |
| Delfzijl to Razlog | 1,099.47 mi (1,769.43 km) |
| Delfzijl to Ruse | 1,084.76 mi (1,745.75 km) |
| Delfzijl to Samokov | 1,077.93 mi (1,734.76 km) |
| Delfzijl to Sandanski | 1,110.82 mi (1,787.70 km) |
| Delfzijl to Sevlievo | 1,094.41 mi (1,761.29 km) |
| Delfzijl to Shumen | 1,145.93 mi (1,844.19 km) |
| Delfzijl to Silistra | 1,118.52 mi (1,800.08 km) |
| Delfzijl to Sliven | 1,154.06 mi (1,857.27 km) |
