Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Sebastian (55% of total searches to Atlantic Coast). The next most popular destinations are Bilbao (32%) and A Coruña (7%). Searches for hotels in Santiago de Compostela (6%) are also popular.
KAYAK users have found double rooms in Atlantic Coast for as cheap as $28 (Bilbao) in the last 3 days. The average price is $288.