| Widnes to Smolyan | 1,503.26 mi (2,419.26 km) |
| Widnes to Sofia | 1,399.57 mi (2,252.40 km) |
| Widnes to Sopot | 1,456.74 mi (2,344.39 km) |
| Widnes to Sozopol | 1,582.83 mi (2,547.32 km) |
| Widnes to Sredets | 1,565.98 mi (2,520.21 km) |
| Widnes to Stamboliyski | 1,471.59 mi (2,368.29 km) |
| Widnes to Stara Zagora | 1,501.45 mi (2,416.35 km) |
| Widnes to Svilengrad | 1,552.80 mi (2,498.98 km) |
| Widnes to Svishtov | 1,438.31 mi (2,314.73 km) |
| Widnes to Targovishte | 1,502.71 mi (2,418.37 km) |
| Widnes to Teteven | 1,426.11 mi (2,295.11 km) |
| Widnes to Troyan | 1,445.11 mi (2,325.68 km) |
| Widnes to Tryavna | 1,476.47 mi (2,376.15 km) |
| Widnes to Tutrakan | 1,470.66 mi (2,366.79 km) |
| Widnes to Varna | 1,557.21 mi (2,506.09 km) |
