Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Edmonton to Galway as you normally would.
Edmonton (YEG) is the airport you will fly out of if you book a flight from Edmonton to Galway. You should not have trouble finding flights to Galway from Edmonton; 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 Edmonton airport to Galway. It is only a 26.9 km journey to Edmonton (YEG) from Edmonton’s city centre.