Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Singapore (59% of total searches to Southeast Asia). The next most popular destinations are Bangkok (20%) and Denpasar (11%). Searches for hotels in Kuala Lumpur (9%) are also popular.
KAYAK users have found double rooms in Southeast Asia for as cheap as $10 (Ho Chi Minh City) in the last 3 days. The average price is $180.