Malev Hungarian seems to fly twice a week in 2009.
In april 2010 they also seem to be using their 737-700 on the route.
Malev seems to offer the return flight for 284 euro in octorber 2009.
You can add to that price the connection to other cities in Europe.
Sometimes Malev offers these flights for around 375 euro in total
return with a connexion in Budapest. If insead you fly non-stop from Paris
you seem to be paying iover 500 euro with Air France. But then you can have a daytime flight.