The price of tickets for low-cost airlines for a specific route has a much larger spread than that of regular airlines. It depends on the time to departure, demand and competition on the route. Unlike regular airlines, low-cost airlines rarely offer cheap tickets more than 3 months before departure. This is because canceling a flight for which tickets have been sold is much easier than canceling a flight for which 100 tickets have been sold, so they stimulate demand only several months before departure when the flight schedule is already more stabilized. This is due to the desire to maintain flexibility in planning the route grid over the long term.
The price will depend on the demand for a particular flight. Low-cost airline tickets purchased at the cheapest fare cannot be returned or exchanged. The cheapest tickets are usually sold 15 days before departure. However, it cannot be said that when buying a ticket on the last day, you will definitely pay cosmic money.
They will not feed you either. Although you will be able to buy lunch during the flight. However, given the flight time (in Europe it is usually no more than 2-3 hours), you, quite possibly, will not have time to get hungry.