Hey, thats a good website, some of the reports are better than the equivalent available from the CAA, but of course it does help if you can speak Spanish.
You can separate departures and arrivals so on the LDY-ALC route you get (from the LDY perspective):
......................JUNE...............JULY.............AUGUST...............TOTALS
DEPARTURES.....1459...96%.......1600...94%....1405...83%..........4464...91%
ARRIVALS...........980...65%.......1444...85%....1590...93%..........4014...82%
TOTALS.............2439...81%......3044...89%....2995...88%..........8478...86%
Interesting but no real surprises.
1) The arrivals figure for June (ie: from ALC to LDY) shows that the route is indeed an outward route taking people to holiday in Spain rather than taking Spaniards to holiday here in the rain.
2) By the end of August, 450 more people had departed than arrived, so presuming that these people are returning rather than emigrating, then these arrivals will be reflected in September and October's arrival figures which should be higher than departures.
3) The above pattern could have been predicted from the differences in flight prices on the Ryanair website, that Arrivals were cheaper than departures in June and July while they were more expensive in August and September.
4) The October loadings, particularly the outwards loadings, will obviously suffer due to the ending of the seaonal flights in the same way that inward loadings suffered in June at the start of the season. I'm not sure it made any sense to end the flights on October 22nd since Halloween is a huge festival in Derry and would have been the one chance to get inward visitors, thus filling the flights and increasing loadings for October.
5) Ignoring available seats on the first two inward flights in June, as presumably these flights would have been fairly empty, gives a much more respectable inward loading of 86%. Obviously Ryanair would not be ignoring these flights while calculating yeilds etc, but it maybe indicates that the seaon could be successfully extended into May and maybe April (ie: from Easter onwards) rather than October which seems out of season. But in any case a seasonal flight will always suffer from low loadings at the beginning and end of the season. Not sure the demand is there for an all year service.