Air France-KLM Flying Blue has launched its March promotional awards that are valid for travel through August 30, 2021, and must be booked by March 30.,,50% off the usual number of miles required (although sometimes the rebate is capped at 25%).

You can access Flying Blue’s web page for promotional awards 
here or 
here.,,You can also book these as one-way. These are not only for flights originating from Europe, as all the destinations are valid for both directions. Flying Blue used to divide Europe into zones 1, 2, and 3 but seems to use the designation EUROPE for all these from now on.,