| Holyoke to Smolyan | 4,696.05 mi (7,557.55 km) |
| Holyoke to Sofia | 4,593.54 mi (7,392.58 km) |
| Holyoke to Sopot | 4,653.29 mi (7,488.75 km) |
| Holyoke to Sozopol | 4,781.53 mi (7,695.13 km) |
| Holyoke to Sredets | 4,764.49 mi (7,667.71 km) |
| Holyoke to Stamboliyski | 4,666.13 mi (7,509.40 km) |
| Holyoke to Stara Zagora | 4,698.75 mi (7,561.91 km) |
| Holyoke to Svilengrad | 4,749.33 mi (7,643.31 km) |
| Holyoke to Svishtov | 4,636.95 mi (7,462.45 km) |
| Holyoke to Targovishte | 4,701.43 mi (7,566.22 km) |
| Holyoke to Teteven | 4,622.63 mi (7,439.40 km) |
| Holyoke to Troyan | 4,642.20 mi (7,470.90 km) |
| Holyoke to Tryavna | 4,674.41 mi (7,522.74 km) |
| Holyoke to Tutrakan | 4,668.83 mi (7,513.75 km) |
| Holyoke to Varna | 4,755.52 mi (7,653.27 km) |
