Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Buffalo to Belfast Intl Airport as you normally would.
Buffalo (BUF) is the airport you will fly out of if you book a flight from Buffalo to Belfast Intl. You should not have trouble finding flights to Belfast Intl from Buffalo; the airport handles an average of 0 outbound flights to Belfast Intl per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Buffalo airport to Belfast Intl. It is only a 13.4 km journey to Buffalo (BUF) from Buffalo’s city centre.