Those of you already in or planning to be in the United Kingdom or Ireland this year now have another reason to be happy about that. Aer Arann, one of Ireland’s main airlines, is offering a 20% discount on all flights taken in 2008 between cities in Ireland and the UK. The catch is that you’ve got to book your tickets by midnight on July 13 – that’s this Sunday.

So, if you’re already planning a holiday in – let’s say – Dublin or Edinburgh, you can get a great deal on a short flight across the water to visit – for instance – Cork or Cardiff. Aer Arann covers lots of cities in the UK and Ireland, which means there should be plenty of temptation to add a quick side-trip to your vacation.

Thanks to the Europe a la Carte blog for the heads-up about this deal; to find out more about the deal, including prices & restrictions, go to the main Aer Arann page and click on the big flashing “20% off” logo on the left.