Fares on LCAs are a lottery, surely everybody understands that?
If, like me, you wanted to travel to Nice from Luton on 1 Sept you have 5 flights to choose from. On the 07:10 the fare is £31.50, on the 10:00 and 13:25 departures the single fare is £171.50 but if you travel on the 17:45 or 19:55 services it will only cost you £16.50.
BA fares on that date (ex LHR) ranged from £30 - £46.
For the flight timings I required BA came out at £119 return and easy at £79-90 but on different services on the same dates I could have paid as much as £279.90 on EasyJet - significantly more expensive than the dearest BA option at £130.70
Caveat emptor
edited for dodgy capitalisation