| Socorro to Devnya | 6,497.56 mi (10,456.82 km) |
| Socorro to Dimitrovgrad | 6,497.88 mi (10,457.32 km) |
| Socorro to Dobrich | 6,486.70 mi (10,439.34 km) |
| Socorro to Dospat | 6,471.65 mi (10,415.11 km) |
| Socorro to Dupnitsa | 6,404.28 mi (10,306.69 km) |
| Socorro to Elhovo | 6,522.89 mi (10,497.57 km) |
| Socorro to Etropole | 6,403.97 mi (10,306.20 km) |
| Socorro to Gabrovo | 6,445.71 mi (10,373.37 km) |
| Socorro to Gorna Oryahovitsa | 6,443.28 mi (10,369.45 km) |
| Socorro to Gotse Delchev | 6,461.43 mi (10,398.67 km) |
| Socorro to Harmanli | 6,513.88 mi (10,483.08 km) |
| Socorro to Haskovo | 6,503.01 mi (10,465.59 km) |
| Socorro to Ihtiman | 6,418.65 mi (10,329.82 km) |
| Socorro to Isperih | 6,447.66 mi (10,376.51 km) |
| Socorro to Kardzhali | 6,511.54 mi (10,479.30 km) |
