What are the cheapest air travels or websites to check to roam around Europe?Never forget surface travel. Europe has a highly developed railway network. In many markets the trains are so quick they have killed off many flights. That's not to say there are no flights just that the few that remain are there largely to feed a hub. Examples include
There are even routes which have no air service at all
Compare Airline Tickets with Skyscanner.com Skyscanner is a handy flight comparison sight.
discover how to get anywhere Rome2Rio is a handy site that compares flight, bus, train and road options.
I find use Booking.com: 454,198 hotels worldwide. Book your hotel now!
Online Hostel Bookings, Ratings and Reviews and Vacation Rentals, Homes, Apartments & Rooms for Rent - Airbnb for accomodation.
I highly recommend Azuon service when trying to find cheap deals on low-cost carriers. It will quite often even find deals that are not even mentioned on for.ex. Ryanair ad on their site!
I have travelled from Bratislava to Bologna and back for 6 eur with this tool. I have also found and bought a ticket from Budapest to Charleroi and back for under a Euro, but did not travel in the end.