| Euskirchen to Smolyan | 1,057.91 mi (1,702.54 km) |
| Euskirchen to Sofia | 954.19 mi (1,535.62 km) |
| Euskirchen to Sopot | 1,011.59 mi (1,627.99 km) |
| Euskirchen to Sozopol | 1,139.58 mi (1,833.98 km) |
| Euskirchen to Sredets | 1,122.14 mi (1,805.90 km) |
| Euskirchen to Stamboliyski | 1,026.20 mi (1,651.51 km) |
| Euskirchen to Stara Zagora | 1,056.56 mi (1,700.37 km) |
| Euskirchen to Svilengrad | 1,107.66 mi (1,782.61 km) |
| Euskirchen to Svishtov | 994.84 mi (1,601.04 km) |
| Euskirchen to Targovishte | 1,059.86 mi (1,705.68 km) |
| Euskirchen to Teteven | 980.95 mi (1,578.68 km) |
| Euskirchen to Troyan | 1,000.13 mi (1,609.55 km) |
| Euskirchen to Tryavna | 1,031.95 mi (1,660.77 km) |
| Euskirchen to Tutrakan | 1,029.89 mi (1,657.45 km) |
| Euskirchen to Varna | 1,115.99 mi (1,796.02 km) |
