Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from O'ahu to Santa Maria Huatulco as you normally would.
Most people fly into Santa Maria Huatulco (HUX) if they book a flight to Santa Maria Huatulco from O'ahu. Huatulco is conveniently located just 5.7 mi from Santa Maria Huatulco’s city center.