| Irving to Smolyan | 6,098.76 mi (9,815.01 km) |
| Irving to Sofia | 5,994.70 mi (9,647.53 km) |
| Irving to Sopot | 6,049.09 mi (9,735.06 km) |
| Irving to Sozopol | 6,166.16 mi (9,923.47 km) |
| Irving to Sredets | 6,151.79 mi (9,900.36 km) |
| Irving to Stamboliyski | 6,066.09 mi (9,762.43 km) |
| Irving to Stara Zagora | 6,092.21 mi (9,804.46 km) |
| Irving to Svilengrad | 6,144.74 mi (9,889.00 km) |
| Irving to Svishtov | 6,023.82 mi (9,694.40 km) |
| Irving to Targovishte | 6,085.44 mi (9,793.56 km) |
| Irving to Teteven | 6,018.67 mi (9,686.11 km) |
| Irving to Troyan | 6,036.61 mi (9,714.99 km) |
| Irving to Tryavna | 6,065.66 mi (9,761.74 km) |
| Irving to Tutrakan | 6,047.15 mi (9,731.96 km) |
| Irving to Varna | 6,133.73 mi (9,871.29 km) |
