Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast to Moncton as you normally would.
Moncton Intl (YQM) is the airport you will fly into if you book a flight from Belfast to Moncton. You should not have trouble finding flights to Moncton Intl from Belfast; the airport handles an average of 0 inbound flights from Belfast per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Moncton airport from Belfast. It is only a 5.5 mi journey from Moncton Intl (YQM) to Moncton’s city center.