| Caerphilly to Juprelle | 383.71 mi (617.52 km) |
| Caerphilly to Jurbise | 318.71 mi (512.92 km) |
| Caerphilly to Kalmthout | 330.79 mi (532.36 km) |
| Caerphilly to Kampenhout | 338.56 mi (544.86 km) |
| Caerphilly to Kapelle-op-den-Bos | 329.81 mi (530.78 km) |
| Caerphilly to Kapellen | 329.82 mi (530.79 km) |
| Caerphilly to Kasterlee | 352.53 mi (567.33 km) |
| Caerphilly to Keerbergen | 341.30 mi (549.27 km) |
| Caerphilly to Kinrooi | 387.39 mi (623.45 km) |
| Caerphilly to Knokke-Heist | 280.42 mi (451.29 km) |
| Caerphilly to Koekelare | 269.59 mi (433.87 km) |
| Caerphilly to Koekelberg | 330.29 mi (531.55 km) |
| Caerphilly to Koksijde | 255.36 mi (410.96 km) |
| Caerphilly to Kontich | 332.13 mi (534.50 km) |
| Caerphilly to Kortemark | 273.08 mi (439.48 km) |
