Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Belfast (79% of total searches to Ulster). The next most popular destinations are Donegal (9%) and Londonderry (9%). Searches for hotels in Portrush (3%) are also popular.
KAYAK users have found double rooms in Ulster for as cheap as $22 (Belfast) in the last 3 days. The average price is $232.