When visiting Greece you will figure out that once is never enough. You cannot fully enjoy the whole of Greece as a tourist, visiting only once, especially since there are so many unique places in both the mainland and the islands. This is what makes the need for cheap flights more than a necessity, and what made the several airlines introduce frequent flights to Greece, in very affordable prices.
When visiting from some major European capitals and cities, especially from the UK, France and Germany there are many flights towards Athens and Crete, or even direct charter flights to many big islands, such as Mykonos and Rhodes or Santorini and Corfu, daily, in very reasonable costs. The fact is that those countries are the main tourist hub for Greece, and in some cases cheap flights to the country are indeed necessary: If you consider how many thousands of tourists, youngsters mostly come to some of the Greek Islands, on a budget, every year, for many or fewer days you can understand why some major airlines introduced charter flights to Greece, costing some tens of Euros. You can actually find flights to many destinations in Greece costing no more than 50 Euros, which is a great price, especially during the high touristic season in summer.
In some cases, as with Easy Jet for example, visitors from Germany and the UK can fly to Greece with even less money than that, depending on the day and time of the year. Many visitors seem to prefer this way of travelling, because if offers a very cost effective solution and moreover, most of these flights are really more frequent than the regular scheduled flights. The airports in Greece, both in Athens and the major islands, can accommodate hundreds of flight daily, a number that skyrockets during summer. It is said that Venizelos, the airport of Athens accommodates 1000 flights every day during the summer months, with thousands of visitors coming, either as their final destination or boarding for another island or city.
If looking for a cheap flight to Greece, consulting with a tourist agency is a good idea, as most airlines tend to sell their cheapest tickets and packages to those agencies, attracting more and more visitors this way. In some cases if you contact the airline directly you might get higher prices, just because this is the arrangement with the tourist agencies. If you are an internet savvy then looking online for cheap flights is also a great solution. There are specific websites that specialize in cheap flights to Greece, such as priceline.co.uk etc, and they can offer you the best solution for the day and time of the year you need, choosing among several flights.
All this of course has boosted the Greek economy, which depends a lot on its tourism, significantly, while the visitors and numerous tourists benefit from good packages and very reasonable prices, in order to visit their favorite destination and island in Greece.