Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Abu Dhabi to Galway as you normally would.
Abu Dhabi Intl (AUH) is the airport you will fly out of if you book a flight from Abu Dhabi to Galway. You should not have trouble finding flights to Galway from Abu Dhabi Intl; the airport handles an average of 0 outbound flights to Galway per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Abu Dhabi airport to Galway. It is only a 28.0 km journey to Abu Dhabi Intl (AUH) from Abu Dhabi’s city centre.