Answer
Only 2 airlines flies between belfast and glasgow. the first one is flybe that flies from belfast george best city airport (bhd) with 3 daily flights glasgow international airport (gla) from sunday thru thursday, 4 daily flights on friday and 2 daily flights on saturday.
easyjet flies out of belfast international airport (bfs) with 4 daily flights to gla from monday thru friday and 3 daily flights on saturday and sunday.
all flight are schedule as a 45 minutes flight.
although, ryanair operates out of glasgow prestwick airport (pik), they do not operate into belfast. the closest northern ireland airport that they do operate into is derry.
