September's version of the Flying Blue Promo Rewards is available to book. As usual you have until the end of the month, 30th September 2019, to book for travel 2 months ahead, so 1st November – 31st December 2019. You need to book the Promo Rewards via Air France or KLM web pages.
The below images show which cities are available this time round.
In Asia/Middle East:
In Caribbean / Indian Ocean:
And finally North America
The list is of similar length to previous months although does seem to be a bit light on the premium cabin front.
Arguably the best value you can have is to Wuhan (if you were going there in the first place, or to New York, Mexico City or Toronto, costing between 45000-48750 Flying Blue miles each way for the business class routes, and 34125 miles for New York.
Don't forget that Flying Blue operates by Zones and the European zone extends as far east as Cyprus and Israel, meaning you can really exploit this if you want to book an open jaw or other non-standard return journey.