Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Covilhã (50% of total searches to Serra da Estrela). The next most popular destination is Manteigas (50%).
KAYAK users have found double rooms in Serra da Estrela for as cheap as S$ 73 (Covilhã) in the last 3 days. The average price is S$ 172.