Can't find any cheap flights Ireland-Spain

Used to be able to fly Dub>Mad for less than €40 return, and Dublin-Malaga for less than €50, I'm talking here about 2011. Now all I see are Madrid for €90+, and Malaga for €120+. I know the Spanish have raised airport taxes, but that can't be the sole reason for such a hike in prices. I did fly Dublin-Tenerife in December for €140 return which is O.K. for a 4 1/2 hour flight. Just booked Dublin>Madrid with Aerlingus end of February for €123 rtn, Ryr was €93. Aerlingus has more convenient departure times in this case.

A bit more on this --- Surprised there hasn't been more talk about this, or maybe I missed it.

I went Dub>Tenerife in November for €140 which compares well to what I paid 2 years ago(€110), cheap for 9 hours in the air.

Cheapest lights to Canaries increase by 30%, flights to Madrid, Malaga by 300%.

Does it have to do with having less aircraft in the air in winter months? then not having then to fill seats at very low prices.