Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Sebastian (51% of total searches to Atlantic Coast). The next most popular destinations are Bilbao (33%) and Vigo (8%). Searches for hotels in A Coruña (8%) are also popular.
KAYAK users have found double rooms in Atlantic Coast for as cheap as $26 (Santiago de Compostela) in the last 3 days. The average price is $282.