Originally Posted by lunedemiel

I think you should add http://www.skylow.com in your list of websites.
It's the only site where you can search and BOOK a ticket on a LCC.
I used their deal finder tool. I found a Paris- London for less than $1. Of course, you have to add taxes and it's one way. But still, it's nice to feel that you've found the very cheapest flight.