Qatar Airways Privilege Club launched a bonus miles offer on March 1 for flights through May 31, 2019 and they just extended the booking window that was supposed to end on March 15.
Members can earn 5X the miles in premium and 4X in economy between March 1 – 31, 2019, and 3X in premium and 2X in economy April – May 31 for tickets issued by March 31.
You can access Qatar Airways here.
Note that this offer is only valid for tickets that are issued between March 1 – 31. You also need to register for this targeted offer on Qatar’s website.
Qatar Airways appears to run these bonus Qmiles offers every few months (most of the time back to back).
You do, however, need to pay attention to the booking deadline requirement and whether only tickets issued on Qatar’s own channels qualify (read the fine print).
I would be hesitant to credit flights to Privilege Club due to the huge devaluation that was done last year and for the fact that you cannot book partner awards online or even on the phone. You need to request them via email that can take days to get a reply to.