| Didcot to Smolyan | 1,402.09 mi (2,256.45 km) |
| Didcot to Sofia | 1,299.41 mi (2,091.19 km) |
| Didcot to Sopot | 1,359.51 mi (2,187.92 km) |
| Didcot to Sozopol | 1,491.01 mi (2,399.55 km) |
| Didcot to Sredets | 1,472.87 mi (2,370.36 km) |
| Didcot to Stamboliyski | 1,371.98 mi (2,208.00 km) |
| Didcot to Stara Zagora | 1,405.36 mi (2,261.71 km) |
| Didcot to Svilengrad | 1,455.48 mi (2,342.36 km) |
| Didcot to Svishtov | 1,346.22 mi (2,166.54 km) |
| Didcot to Targovishte | 1,411.76 mi (2,272.01 km) |
| Didcot to Teteven | 1,328.85 mi (2,138.58 km) |
| Didcot to Troyan | 1,348.71 mi (2,170.54 km) |
| Didcot to Tryavna | 1,381.71 mi (2,223.64 km) |
| Didcot to Tutrakan | 1,383.10 mi (2,225.88 km) |
| Didcot to Varna | 1,468.92 mi (2,363.99 km) |
