Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kuala Lumpur to Galapagos as you normally would.
Related info for your journey
Useful info, stats and facts about Kuala Lumpur to Galapagos flights.
This is defined as Kuala Lumpur Intl Airport (KUL) and Baltra Airport (GPS). Codes like Baltra Airport are often used to just call airports uniquely. Kuala Lumpur Subang Airport (SZB), Malacca Batu Berendum Airport (MKZ) are some additional IATA codes for airports related to your trip.