| Mont-de-Marsan to Smolyan | 1,283.67 mi (2,065.87 km) |
| Mont-de-Marsan to Sofia | 1,197.02 mi (1,926.42 km) |
| Mont-de-Marsan to Sopot | 1,268.24 mi (2,041.03 km) |
| Mont-de-Marsan to Sozopol | 1,418.16 mi (2,282.30 km) |
| Mont-de-Marsan to Sredets | 1,394.47 mi (2,244.19 km) |
| Mont-de-Marsan to Stamboliyski | 1,265.66 mi (2,036.89 km) |
| Mont-de-Marsan to Stara Zagora | 1,316.24 mi (2,118.28 km) |
| Mont-de-Marsan to Svilengrad | 1,354.93 mi (2,180.55 km) |
| Mont-de-Marsan to Svishtov | 1,284.97 mi (2,067.95 km) |
| Mont-de-Marsan to Targovishte | 1,350.44 mi (2,173.32 km) |
| Mont-de-Marsan to Teteven | 1,240.41 mi (1,996.25 km) |
| Mont-de-Marsan to Troyan | 1,263.18 mi (2,032.90 km) |
| Mont-de-Marsan to Tryavna | 1,302.22 mi (2,095.72 km) |
| Mont-de-Marsan to Tutrakan | 1,342.34 mi (2,160.29 km) |
| Mont-de-Marsan to Varna | 1,416.67 mi (2,279.92 km) |
