Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Langkawi to Dhaka as you normally would.
Related info for your journey
Useful info, stats and facts about Langkawi to Dhaka flights.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Langkawi Airport to Dhaka Hazrat Shahjalal Intl Airport flight would often be abbreviated as a LGK to DAC flight.