Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Manteigas (67% of total searches to Serra da Estrela). The next most popular destination is Seia (33%).
KAYAK users have found double rooms in Serra da Estrela for as cheap as 100 ﷼ (Seia) in the last 3 days. The average price is 910 ﷼.