No, Belavia has no scheduled flights out of Dublin. However, Belavia does fly out of Kaliningrad. There are also other airline options to choose from if you still want to book a flight from Dublin. Smartavia, for example, is an airline that flies out of Dublin on a regular basis.
Saint Petersburg Pulkovo is the most popular airport that Belavia serves, followed by Minsk Intl 2 and Moscow Domodedovo.