Fjelstrup is an urban Settlement in Haderslev Municipality, in the region of Southern Denmark, Denmark. Fjelstrup lies at 28 m above sea level. It has 559 inhabitants (2026). The nearest city is Haderslev, 9.3 km to the southwest. Beaches nearby: Hejlsminde (5.3 km), Knud (4.9 km), Sandersvig (5.8 km). Among the landmarks around are Haderslev Cathedral (9.2 km), Skamlingsbanken (10.9 km) and Koldinghus (19.8 km). Among the natural features are Knivsbjerg (22 km) and Fænø Kalv (20 km).