| Thornton Heath to Kidbrooke | 7.25 mi (11.67 km) |
| Thornton Heath to Kidderminster | 113.97 mi (183.42 km) |
| Thornton Heath to Kidlington | 58.54 mi (94.21 km) |
| Thornton Heath to Kidsgrove | 147.57 mi (237.49 km) |
| Thornton Heath to Killamarsh | 142.05 mi (228.61 km) |
| Thornton Heath to Killingworth | 257.95 mi (415.13 km) |
| Thornton Heath to Kilmarnock | 342.12 mi (550.58 km) |
| Thornton Heath to Kilsyth | 355.20 mi (571.64 km) |
| Thornton Heath to Kilwinning | 349.16 mi (561.92 km) |
| Thornton Heath to King's Lynn | 95.98 mi (154.46 km) |
| Thornton Heath to Kings Norton | 104.16 mi (167.63 km) |
| Thornton Heath to Kingsnorth | 46.26 mi (74.45 km) |
| Thornton Heath to Kingsteignton | 162.79 mi (261.99 km) |
| Thornton Heath to Kingston upon Hull | 162.24 mi (261.10 km) |
| Thornton Heath to Kingston upon Thames | 8.26 mi (13.29 km) |
