Overview

• American Express is offering a 30% bonus to Marriott Bonvoy from Oct. 1 through Nov. 30, 2025, and a 20% bonus to Air France–KLM Flying Blue from Oct. 1 through Oct. 31, 2025.
• The Marriott offer changes the standard 1:1 setup to a hard‑coded 1,000:1,300 transfer ratio during the promotion window.
• Both promotions are embedded in Amex’s transfer ratios and typically post instantly, with the Flying Blue bonus capped at 999,999 points per transaction but available for unlimited transactions.
• Coverage assesses the Marriott bonus as generally less compelling given lower point valuations, though topping off for a specific stay could still make sense.
• Analysts highlight Flying Blue’s strong transatlantic uses and wider award access on Air France/KLM, while noting taxes and fees on awards and the one‑way nature of bank point transfers.