Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is London (81% of total searches to Northern Europe). The next most popular destinations are Dublin (8%) and Edinburgh (7%). Searches for hotels in Copenhagen (4%) are also popular.
KAYAK users have found double rooms in Northern Europe for as cheap as $20 (Tallinn) in the last 3 days. The average price is $364.