Today only, Ryanair is offering a serious fare sale. 150,000 fares on flights during the last three weeks of January are going for €1/£1 apiece.
There are restrictions, of course. This fare is only available between mid-day Monday and mid-day Thursday, and not on all routes. The promotion ends at midnight, so there isn’t time to check fares and availability to see how many cheap fares actually turn up. We’re going to trust that the fares are there and encourage readers to try to find them.
A partial list of covered routes can be found here (in PDF format.)