Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast to Halifax as you normally would.
For a flight from Belfast to Halifax, you will be flying into Halifax Intl. Halifax Intl (YHZ) is just 16.7 mi from the center of the city. Halifax Intl is the only Halifax airport and it handles 0 inbound flights from Belfast per day. 0 airlines have flights to Halifax Intl from Belfast on a regular basis.