Ryanair is definitely an option, but you have to keep in mind that only one piece of handluggage (and maximum 10kg – they check the wight of your handluggage) is free! You can check up to a bag of 15 kg for a fee of 15€ or 20kg for 25€ and if necessary a second bag of up to 15 kg for 35€. If your luggage exceeds (even if only slightly) the weight limits, it gets expensive!
A cheap Ryanair flight can turn into a rip-off quickly that way! But keeping that all in mind you can catch great cheap fares – I flew all around Europe with Ryanair for 1 € (sometimes even less) oneway many times.