Flying Blue members can redeem just 55,000 miles for a one-way flight from Hanoi to Boston or Orlando, and you can, at least theoretically, have a stopover in Paris, too, without extra charge (read more here).
You can access Flying Blue here.
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I made several rate searches for various Air France destinations in North America but could only bring up this 55K award rate to Boston and Orlando.
Hanoi – Boston
The 55,000 miles one-way business class rate is widely available.
The taxes and mostly fees come at roughly $470 for this routing.
These Flying Blue award flash sales are great but somewhat unusual city pairs.
Also, the Air France and KLM websites don’t always bring up the award calendar (read more here) that allows you to see the availability for months at a time, which is really helpful.
It seems that the regular award price from Vietnam to North America is around 200,000 miles, so these award sales are a great way to save some miles.