I wrote my own client-side multi-flight planning app about four years ago, using web scraping to include Ryanair, Easyjet and others, in order to plan a cheap vacation. A particular problem with Ryanair is, I believe, that they are explicitly against any kind of disintermediation or technology-enabled price competition.
You cannot scrape their prices because they keep bumping them by a cent for each N tickets (so they can say that "only N seats left for X euro, book now before it's too late" all the time), and also because you cannot reliably reverse engineer all their random fees.
Actually, I can scrape the prices, because it was my personal client, only ever run by me, with fresh prices confirmed by faking a run through the booking process.
