Gliding is one of the cheapest forms of flying, with an hourly cost well under half that of powered aircraft training. For details of the costs, please see the Tariff.
If you are starting from scratch it's quite expensive while you're learning, as you need to fly regularly and may have several flights in one day. Once you're a solo pilot it gets a whole lot cheaper, especially if you buy a share in a glider of your own.
In club aircraft the cost depends on how long you're airborne. An average training flight costs in the region of £25 and most people take 50-100 flights to achieve solo standard, typically spread over 6 months to a year. There is a huge amount of variation, depending on how old you are (younger pilots tend to learn faster) and how frequently you fly (you learn much faster if you fly regularly). If you come on one of our week-long summer courses you'll probably save yourself a lot of time and money in training.