Соответствие цены и качества полета. Нормальное обслуживание на борту. Есть напитки холодные(вода, соки) и горячие(чай, кофе). Можно подкрепиться во время перелета бесплатной шоколадкой или хрустиками.
I've been flying with Fly Niki for two years and I am quite satisfied with their services in general. Except for a short delay due to poor weather conditions I haven't experienced any troubles during my trips. The crew is professional and they provide good comfort to the passengers (the even offer free magazines and newspapers but only in German language). Even if there are cheaper low cost airlines, I think that Fly Niki is a trustworthy company and their services are a good value for money.
Compare prices: On LowCostRoutes.com you can find the list of all the airlines flying from an airport/city to another. This way, you will know exactly which low cost airlines offer cheap flights on your route and you will be able to compare their prices and schedules in order to choose the flights that suit you best.