You can buy miles with a 100% bonus from Flying Blue, KLM & Air France’s frequent flyer program, until September 30, 2021. To get the 100% bonus, you have to purchase at least 20,000 miles (+ bonus) for €550.
You normally pay €27.50 for every 1,000 miles. On top of that, there is currently a bonus of up to 100%. This means that instead of €27.50, you’d actually only pay €13.75 per 1,000 miles. This also results in a price of 1.375 cents/mile.
Without a status, you can buy a maximum of 100,000 miles per calendar year from Flying Blue. In addition, you’ll currently receive the bonus and thus up to 200,000 miles. Elite members can buy up to 300,000 (+ 300,000 bonus) miles.
Source: One Mile At A Time – Thanks!