Here is a great list of low-cost airlines you can use for travel from the United Kingdom. In parentheses is the year the airline was founded. The airline's official website link is below each listing. Also see our list of low-cost US airlines for more great options if you're looking for great deals or dirt cheap airline tickets from the United States.
Air Southwest (2003)
Website: http://www.airsouthwest.com/
bmibaby (2002)
Website: http://www.bmibaby.com/
EasyJet (1995)
Website: http://www.easyjet.com/
Flybe (1979)
Website: http://www.flybe.com/
Flyglobespan (2002)
Website: http://www.flyglobespan.com/
GB Airways (1931-2008*) *ceased operations
Website: http://www.gbairways.co.uk/
Jet2.com (2002)
Website: http://ww.jet2.com/
Manx2 (2006)
Website: http://www.manx2.com/
Monarch Airlines (1967)
Website: http://www.flymonarch.com/
Thomsonfly (1962, as Euravia)
Website: http://www.thomsonfly.com/
XL Airways (1994 as Sabre)
Website: http://www.xl.com/
Loganair (1962)
Website: http://www.loganair.co.uk/
Zoom Airlines Limited (2006)
Website: http://www.flyzoom.com/
Related information:
List of Low-Cost US Airlines
Find Dirt Cheap Airline tickets
(Note: Airlines listing info from Wikipedia.org)