| Foster City to Devnya | 6,543.84 mi (10,531.29 km) |
| Foster City to Dimitrovgrad | 6,576.15 mi (10,583.29 km) |
| Foster City to Dobrich | 6,526.98 mi (10,504.16 km) |
| Foster City to Dospat | 6,569.22 mi (10,572.15 km) |
| Foster City to Dupnitsa | 6,507.18 mi (10,472.29 km) |
| Foster City to Elhovo | 6,589.52 mi (10,604.81 km) |
| Foster City to Etropole | 6,492.08 mi (10,447.99 km) |
| Foster City to Gabrovo | 6,519.29 mi (10,491.78 km) |
| Foster City to Gorna Oryahovitsa | 6,510.46 mi (10,477.57 km) |
| Foster City to Gotse Delchev | 6,564.48 mi (10,564.51 km) |
| Foster City to Harmanli | 6,589.95 mi (10,605.51 km) |
| Foster City to Haskovo | 6,582.73 mi (10,593.87 km) |
| Foster City to Ihtiman | 6,512.48 mi (10,480.82 km) |
| Foster City to Isperih | 6,497.38 mi (10,456.52 km) |
| Foster City to Kardzhali | 6,596.06 mi (10,615.34 km) |
