American Express cardholders in the US have a limited window to squeeze extra value from their Membership Rewards points: through October 31, 2026, transfers to Air France-KLM Flying Blue earn a 25% bonus. That turns 100,000 Amex points into 125,000 Flying Blue miles, applied automatically in the transfer ratio — no promo code or registration needed. Transfers are usually instant and can be repeated as often as you like, capped at 999,999 points per transaction.
This isn't a bonus that appears often. The two programs run promotions together roughly once or twice a year, and 25% is at the top end of what's typically offered — the last 25% match ran in June 2026. Anyone sitting on a pile of Amex points with a Europe trip on the horizon is the obvious target.
Flying Blue earns its reputation for a couple of reasons. Air France and KLM release more award seats to their own members than to partner programs, so booking through Flying Blue often unlocks space you simply can't see elsewhere. Its pricing on transatlantic flights is regularly among the best around, and it has become the go-to program since Delta SkyMiles' repeated devaluations pushed most savvy redeemers toward the Air France-KLM side of the partnership. One perk worth knowing: Flying Blue Platinum members get access to extra award availability.
Two caveats before moving points. First, Flying Blue was devalued in September 2026 — awards now use a tiered structure, with the cheapest "Light" fares stripping out inclusions that used to come standard. Matching the old experience means booking a pricier "Standard" fare in miles. Second, every major transferable points currency partners with Flying Blue, so if your flexible points could serve other goals, it's worth deciding whether Amex is the right stash to drain. Once points move to a single airline program, you're exposed to future devaluations.
The classic advice applies: transfer when you have a specific redemption in mind, ideally for flights in the next several months. If you already know you want a business class seat to Paris or Amsterdam, a 25% boost is about as good as this deal gets. If you're hoarding points with no firm plans, the safer play is to wait for your trip to take shape.
