Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Bangkok (38% of total searches to Southeast Asia). The next most popular destinations are Singapore (37%) and Manila (14%). Searches for hotels in Ho Chi Minh City (11%) are also popular.
KAYAK users have found double rooms in Southeast Asia for as cheap as $6 (Phu Quoc) in the last 3 days. The average price is $132.