Wizz Air has made this announcement:

Wizz Air has announced on April 5 that has suspended its routes between Romania and Great Britain, Switzerland and The Netherlands starting from the April 5 until the April 18. The measure is due to new travel restrictions imposed by Romanian authorities on all flights from Romania to these countries in the efforts to limit the Covid-19 pandemic. As a result of the restrictions from Romania and all over Europe, the routes to Belgium, Austria, Spain, France and Germany remain suspended until the April 30.