Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Copenhagen (54% of total searches to Baltic Sea). The next most popular destinations are Stockholm (22%) and Helsinki (19%). Searches for hotels in Tallinn (5%) are also popular.
KAYAK users have found double rooms in Baltic Sea for as cheap as S$ 15 (Gdansk) in the last 3 days. The average price is S$ 283.