Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Copenhagen (57% of total searches to Baltic Sea). The next most popular destinations are Saint Petersburg (22%) and Stockholm (14%). Searches for hotels in Helsinki (8%) are also popular.
KAYAK users have found double rooms in Baltic Sea for as cheap as RM 51 (Gdansk) in the last 3 days. The average price is RM 870.