| Hertford to Karditsa | 1,357.70 mi (2,185.01 km) |
| Hertford to Kastoria | 1,276.83 mi (2,054.85 km) |
| Hertford to Katerini | 1,335.26 mi (2,148.89 km) |
| Hertford to Keratsini | 1,490.99 mi (2,399.51 km) |
| Hertford to Kerkyra | 1,272.37 mi (2,047.69 km) |
| Hertford to Kiato | 1,457.05 mi (2,344.89 km) |
| Hertford to Kifisia | 1,492.45 mi (2,401.86 km) |
| Hertford to Kilkis | 1,315.34 mi (2,116.83 km) |
| Hertford to Komotini | 1,409.93 mi (2,269.06 km) |
| Hertford to Korinthos | 1,467.20 mi (2,361.22 km) |
| Hertford to Koropi | 1,503.84 mi (2,420.19 km) |
| Hertford to Korydallos | 1,491.37 mi (2,400.12 km) |
| Hertford to Kos | 1,682.83 mi (2,708.25 km) |
| Hertford to Kozani | 1,306.67 mi (2,102.89 km) |
| Hertford to Lagos | 1,395.88 mi (2,246.45 km) |
