Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Copenhagen (53% of total searches to Baltic Sea). The next most popular destinations are Stockholm (26%) and Gdansk (14%). Searches for hotels in Riga (7%) are also popular.
KAYAK users have found double rooms in Baltic Sea for as cheap as £9 (Gdansk) in the last 3 days. The average price is £139.