Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Singapore (63% of total searches to Southeast Asia). The next most popular destinations are Johor Bahru (17%) and Bangkok (13%). Searches for hotels in Kuala Lumpur (7%) are also popular.
KAYAK users have found double rooms in Southeast Asia for as cheap as S$ 8 (Ho Chi Minh City) in the last 3 days. The average price is S$ 143.