Just came across Lufthansa‘s Meilenschnäppchen for November.
Apart from their business class offerings to the US for only 55.000 miles return, flights to Nagoya for Sakura for 70.000 miles seem to be a real bargain. Especially if you are planning to visit Japan anyhow. Period of travel March 1st to April 15th 2019.
For Bloom 2019 please check the dedicated site of JNTO regularly.