Skyscanner, which compares both ‘no frills' carriers and scheduled airlines, has found that in many scenarios, ‘low cost' carriers can be more expensive than their ‘full fare' counterparts, depending on the travellers' individual needs.
Due to the complexity of the fare structures, with additional charges for check-in bags, food, seat selection, and different fees depending on how the flight is paid for, getting the cheapest flights now depends on entirely on the individual's travel situation.
Basic Traveller with hand luggage only – fly RyanairFor one adult and one child flying with hand luggage only, and purchasing no food or drink onboard, no-frills carriers such as Ryanair and easyJet still tend to offer the lowest fares, with BA being the most expensive.

Flights for one adult and one child, from a London airport, to Malaga, departing 1 July, returning 8 July 2012. Searches made on 25 April 2012
Flying with 20kg check-in bag – fly easyJetAdditional fees vary considerably from airline to airline; in the same scenario, adding the cost of a 20kg check-in bag, easyJet becomes the cheapest option, and Ryanair's fee jumps by £70, making it just £10 cheaper than BA, which moves in to third place.

Flights for one adult and one child, from a London airport, to Malaga, departing 1 July, returning 8 July 2012. Searches made on 25 April 2012
Skiers and Golfers – fly BAFor those wanting to carry sports equipment, scheduled airlines can offer the lowest fares. Whereas BA and Swiss carry skis or golf clubs as part of the normal baggage allowance for no extra fee, easyJet charge £50 and Ryanair charge a whopping £100, adding a considerable amount to the total fare.
Skyscanner compared the total costs for one adult flying from a London airport for a ski holiday to Geneva and a golf holiday to Faro, and found that BA offered the cheapest fare in both examples, once sports equipment was added.

Sam Baldwin, Skyscanner Travel Editor commented:
"The airline offering the cheapest fare depends entirely on the individual's needs. For the lone passenger travelling with just hand baggage, no-frills airlines generally still offer the cheapest fares. But for families, groups, or those carrying sports equipment, it is much less clear cut, and in many cases, scheduled airlines may offer the best deals."
www.Skyscanner.net