| Kalkar to Devnya | 1,148.57 mi (1,848.45 km) |
| Kalkar to Dimitrovgrad | 1,125.25 mi (1,810.91 km) |
| Kalkar to Dobrich | 1,144.39 mi (1,841.71 km) |
| Kalkar to Dospat | 1,091.89 mi (1,757.22 km) |
| Kalkar to Dupnitsa | 1,023.85 mi (1,647.73 km) |
| Kalkar to Elhovo | 1,156.36 mi (1,860.98 km) |
| Kalkar to Etropole | 1,028.67 mi (1,655.48 km) |
| Kalkar to Gabrovo | 1,077.27 mi (1,733.71 km) |
| Kalkar to Gorna Oryahovitsa | 1,079.30 mi (1,736.97 km) |
| Kalkar to Gotse Delchev | 1,080.51 mi (1,738.92 km) |
| Kalkar to Harmanli | 1,142.01 mi (1,837.88 km) |
| Kalkar to Haskovo | 1,129.53 mi (1,817.80 km) |
| Kalkar to Ihtiman | 1,040.73 mi (1,674.89 km) |
| Kalkar to Isperih | 1,098.33 mi (1,767.59 km) |
| Kalkar to Kardzhali | 1,135.67 mi (1,827.69 km) |
