applefares.com, A site highly
recommended in the newsgroup to search for fares on most low cost
airlines.
Kayak.co.uk:- Just about the
best search engine I've found so far.
lowfareflights.co.uk
have asked to be included on this page and their site appears well laid
out and the information quite extensive and certainly worth looking at.
For long haul flights try:-
Kayak.co.uk:- Just about the
best search engine I've found so far.
Skyscanner.net:- This
site I have seen mentioned and recommended it quite a few places. Will
often find the cheapest if not the most convenient routing. Well worth a
look especially if on a budget.
Flight Comparison it has had an odd mention in the newsgroup so
worth a look, but it is limited to the number of sources it searches.
I am always happy to include sites on this page recommended to me, so
if you use one you are willing to recommend please do so.