| Guastalla to Devnya | 845.61 mi (1,360.89 km) |
| Guastalla to Dimitrovgrad | 773.15 mi (1,244.26 km) |
| Guastalla to Dobrich | 853.21 mi (1,373.11 km) |
| Guastalla to Dospat | 714.53 mi (1,149.93 km) |
| Guastalla to Dupnitsa | 648.74 mi (1,044.05 km) |
| Guastalla to Elhovo | 817.23 mi (1,315.20 km) |
| Guastalla to Etropole | 678.66 mi (1,092.20 km) |
| Guastalla to Gabrovo | 742.80 mi (1,195.43 km) |
| Guastalla to Gorna Oryahovitsa | 755.82 mi (1,216.38 km) |
| Guastalla to Gotse Delchev | 696.26 mi (1,120.52 km) |
| Guastalla to Harmanli | 790.38 mi (1,272.00 km) |
| Guastalla to Haskovo | 774.32 mi (1,246.15 km) |
| Guastalla to Ihtiman | 678.22 mi (1,091.48 km) |
| Guastalla to Isperih | 802.15 mi (1,290.93 km) |
| Guastalla to Kardzhali | 771.80 mi (1,242.09 km) |
