Many people visit Chatuchak market and never knew that there is a butterfly-park in the area. There is no admission-fee to visit the butterfly-park and it is very close to the BTS Mo Chit Station. See the map below for better direction. You will note that it is also close to the JJ Mall as well as the MRT Chatuchack Station.
The Bangkok Butterfly Garden is home to thousands of colorful butterflies which are all housed underneath a giant 15-meter-tall open-air dome. The butterfly park is large and makes for a good day trip with its 1,100 square meters area. There is also exhibition rooms showcasing life cycle of insects and makes for a good learning experience for children. The opening hours is Tuesday – Sunday, 8.30 a.m.-4.30 p.m. Note that the park is not too far from the Bangkok Bus Station in Thailand.