RyanAir flies to almost all the countries of Europe. You could also either visit the RyanAir website or go to the RyanAir office in your city or call them or send them an e-mail requesting them to provide you with the specific information about the cheapest flights on RyanAir.

RyanAir flies to and from the following cities in England: Birmingham, Blackpool, Bournemouth, Bristol, Leeds, Liverpool, London, Manchester, Middlesbrough, Newcastle upon Tyne, Newquay, Nottingham and Sheffield.

It also flies to and from the cities of Aberdeen, Edinburgh, Glasgow and Inverness in Scotland, the city of Londonderry in Northern Ireland and the cities of Cork, Dublin, Killarney, Knock and Limerick, which are located in the Republic of Ireland.

 Try some of these sites.
Cheapflights (europe)

mse flightchecker
airline network .........
Flybudget ... Who flies where
ryanair destination guide ..........
Ryanair .............
Cheapflights (worldwide)