Last updated: October 1, 2026
A 25% transfer bonus from Amex Membership Rewards to Air France-KLM Flying Blue is live for US cardholders through October 31, 2026. That is as good as this corridor usually gets — the same 25% ran in June — and it is still not a reason to dump a Membership Rewards balance into Flying Blue “just in case.”
Transfer if you can already see the seat, you have priced the cash taxes and carrier surcharge, and you know whether you are buying a Light award or a Standard award. Flying Blue miles are a one-way door. Amex will not take them back, and the September award restructure means the mileage number on the promo page is no longer the product you remember.
Before you move points: Plug your spending into the credit card optimizer so you know whether Membership Rewards is even the currency you should be earning. A transfer bonus does not fix a wallet that should be on a different card.
The promo, without the fluff
American Express is running this on the US Membership Rewards side. The bonus is hard-coded into the transfer ratio, so you should see 1,250 Flying Blue miles per 1,000 Membership Rewards points on the transfer screen. There is nothing to register for.
| Detail | What you actually get |
|---|---|
| Window | October 1–October 31, 2026 |
| Who | US Amex Membership Rewards |
| Base ratio | 1:1 (1,000 MR → 1,000 Flying Blue miles) |
| Bonus ratio | 1,000 MR → 1,250 Flying Blue miles |
| How it posts | Built into the ratio at the moment you transfer |
| How many times | Unlimited |
| Per-transfer cap | 999,999 points |
| Speed | Usually instant |
| Registration | None |
Confirm the ratio on your own Amex transfer page before you submit. A screen that still shows 1:1 means the bonus is not on your account. Transfers are usually instant, which is the only speed that matters: find the seat, transfer, book. If a transfer hangs, do not fire a second one until the first resolves.
Before and after: the only math that matters
The bonus is 25% more miles, which means you need 20% fewer Membership Rewards points for the same award. One divided by 1.25 is 0.8.
| Membership Rewards transferred | Flying Blue miles at 1:1 | Flying Blue miles with the 25% bonus | Extra miles |
|---|---|---|---|
| 10,000 | 10,000 | 12,500 | 2,500 |
| 20,000 | 20,000 | 25,000 | 5,000 |
| 36,000 | 36,000 | 45,000 | 9,000 |
| 45,000 | 45,000 | 56,250 | 11,250 |
| 48,000 | 48,000 | 60,000 | 12,000 |
| 60,000 | 60,000 | 75,000 | 15,000 |
| 80,000 | 80,000 | 100,000 | 20,000 |
| 100,000 | 100,000 | 125,000 | 25,000 |
The rows that matter for the awards below are 36,000, 45,000, 48,000, and 60,000 Membership Rewards. If you cannot point at one of those and a date, you are not ready to transfer.
September changed what those miles buy
Flying Blue devalued awards in September 2026 and split the old single price into Light, Standard, and Flex. The headline saver number did not vanish. It got thinner. On transatlantic business class, plan around these baselines:
| Fare brand | Transatlantic business, one way | What you are actually buying |
|---|---|---|
| Light | About 60,000 miles | The cheap award. No lounge. Limited bags. Limited changes and refunds unless your Flying Blue status already gives you those benefits. |
| Standard | About 75,000 miles | The flexible award. This is the closer match to what a “normal” business award used to include. |
| Flex | Higher than Standard | The most flexible brand. Read the fare rules in the booking flow. Do not assume a published price. |
A 60,000-mile business award in October 2026 is not last spring’s 60,000-mile business award. Transfer 48,000 Membership Rewards, book Light, and then discover you cannot change the date or enter the lounge, and the bonus still produced a bad ticket. Standard costs more miles on purpose. The transfer bonus is how you buy that flexibility back.
When to transfer — and when to leave the points alone
Move Membership Rewards only when all four of these are true:
- The seat is on the calendar. A specific Air France or KLM flight, cabin, and date, with the Membership Rewards cost already calculated.
- You know the brand. Light is acceptable for this trip, or you have priced Standard and you are transferring enough to buy it.
- The cash co-pay is fine. Awards still collect taxes and a carrier-imposed surcharge. Miles do not cover that. Price it on Air France or KLM first.
- These points are spare. You are not raiding a balance you need for another Amex partner, another traveler, or a signup bonus that is still posting.
Leave the balance where it is if any of these are true:
- You do not have a booking. “I fly to Europe every year” is not a booking. A Flying Blue stash does not create a business-class seat.
- Your dates might move. Light is the wrong tool for a trip that is still a maybe, unless status already restores changes or refunds.
- The only space you like is extraExclusive and you cannot see that fare in your account. Details below.
- Another currency is the one you can spare. Chase Ultimate Rewards, Capital One miles, and Citi ThankYou Points also transfer to Flying Blue. This 25% does not ride along. Check the live ratio in that issuer’s tool. A plain Chase transfer can still be right if Chase is the surplus balance. It is a worse ratio than this bonus.
- You want to “do something” about a different devaluation. Chase just cut Hyatt transfers for Sapphire Preferred and Ink Business Preferred, which we covered in the Chase Hyatt 4:3 guide. That is not a reason to convert Amex points into speculative Flying Blue miles.
The expensive version of this promo is transferring 100,000 Membership Rewards on October 30 because the bonus is ending, then refreshing an empty calendar for six months.
Stack the bonus with October Promo Rewards
Flying Blue’s October 2026 Promo Rewards are the other half of the deal. Book by October 31, 2026, for travel through March 31, 2027, and selected routes are discounted about 25% off the new baseline. Space is the constraint. The discount is not a fare you can demand.
The promo page leads with one mileage number. After September, that number is the Light price. Standard is discounted from its own higher baseline and shows up as a separate price in the booking flow. Confirm both before you transfer. These are October 2026 planning figures, not a promise that your date has a seat.
The business-class stack
| Award | Flying Blue miles | Amex MR at 1:1 | Amex MR with the 25% bonus |
|---|---|---|---|
| Transatlantic business Light, no promo | 60,000 | 60,000 | 48,000 |
| Transatlantic business Standard, no promo | 75,000 | 75,000 | 60,000 |
| Europe–Seattle business Light promo | 45,000 | 45,000 | 36,000 |
| Europe–Seattle business Standard promo | 56,250 | 56,250 | 45,000 |
| Europe–Mexico City business promo (KLM) | 45,000 | 45,000 | 36,000 |
| Europe–Orlando business promo (Air France, extraExclusive) | 45,000 | 45,000 | 36,000 |
| Europe–Cancun business promo (Air France, extraExclusive) | 45,000 | 45,000 | 36,000 |
Two results are worth memorizing, and they hold only when the seat exists:
- 45,000 ÷ 1.25 = 36,000 Membership Rewards for Europe–Seattle business Light, one way. The same 36,000-point math applies to the 45,000-mile Mexico City, Orlando, and Cancun business promos, with the extraExclusive catch on Orlando and Cancun.
- 56,250 ÷ 1.25 = 45,000 Membership Rewards for Europe–Seattle business Standard, one way.
Promo Light with no transfer bonus costs 45,000 Membership Rewards. Promo Standard with the 25% bonus also costs 45,000 Membership Rewards. If you were willing to spend 45,000 Amex points on the restricted Light fare, the bonus buys the flexible Standard fare for the same Amex outlay — on a route where that 56,250-mile Standard promo is actually bookable. That is the transfer worth making. Not a speculative top-up.
Against a non-promo Light award at 1:1 (60,000 Membership Rewards), the full stack cuts business Light to 36,000. That is 24,000 Membership Rewards saved, and you only capture it if the promo seat is there.
Light versus Standard, in plain language
Light is the price people screenshot: no lounge, a tighter bag allowance, and limited changes or refunds unless Flying Blue status already includes them. Fine for a simple nonstop on dates that will not move. A bad buy if the itinerary is fragile.
Standard costs more miles and gives the flexibility back. On a Seattle-style promo, 56,250 miles is 25% off the roughly 75,000-mile Standard baseline, and the bonus prices it at 45,000 Membership Rewards. If you want the award people mean by “business class to Europe on points,” price Standard.
Flex sits above that. Use it only when the booking flow shows a price and rules you have actually read.
extraExclusive is a gate, not a footnote
Europe–Seattle business (Air France, 45,000 miles) and Europe–Mexico City business (KLM, 45,000 miles) are ordinary promo awards. Europe–Orlando and Europe–Cancun business, also 45,000 miles on Air France, are marked extraExclusive. That flag can limit the fare to members who hold Flying Blue’s paid Extra subscription. If you cannot see the seat in the account that will issue the ticket, do not transfer toward it.
These long-haul prices are for travel between Europe and the named city, in either direction, at the lowest displayed price, and only when space exists. They are not every US departure, every date, or a stopover you can force online.
Economy and premium promos are real, and they are not the business headline
The month is not only business class. A few verified October examples:
| Promo | Flying Blue miles | Amex MR with the 25% bonus |
|---|---|---|
| Europe–Shanghai, Singapore, or Hong Kong economy | 22,500 | 18,000 |
| Europe–Miami premium economy | 30,000 | 24,000 |
| Europe–Boston, Houston, or Montreal economy | 18,750 | 15,000 |
| Europe–Beijing business (KLM) | 63,750 | 51,000 |
Beijing is the row to read twice. That October promo is business at 63,750 miles (51,000 Membership Rewards), not a 22,500-mile economy award. The 22,500-mile economy promos are Shanghai, Singapore, and Hong Kong. Economy can mop up a small balance. Business class is why this bonus exists.
Who should pull the trigger
Transfer if you already hold Membership Rewards and you have a flight. Those points usually sit on a card you already decided to keep: the Amex Gold for dining and groceries, or the Amex Platinum for the premium coupon book. The promo does not change whether those annual fees are worth it.
Pull the trigger when you can book Air France or KLM through March 31, 2027 at a promo price, or on any date where non-promo Light at 48,000 Membership Rewards or Standard at 60,000 still beats cash after the surcharge. You have either accepted Light, or you are using the bonus to buy Standard for the same 45,000 Membership Rewards Light would have cost at 1:1. Transfer into the Flying Blue account that will issue the ticket, and move only what the booking needs.
A couple on Seattle–Europe in business Standard is the clean version of the deal: two seats at 56,250 miles is 112,500 Flying Blue miles, or 90,000 Membership Rewards (112,500 ÷ 1.25). Real redemption. Also a lot of points to move before both seats are visible at that price.
Alternatives: move the right currency
Chase, Capital One, and Citi all transfer to Flying Blue. That is useful, and it is why you should not be sentimental about which balance moves.
| Currency | Does this 25% apply? | When to use it instead |
|---|---|---|
| Amex Membership Rewards | Yes, through October 31, 2026 | You have MR and a specific Flying Blue booking. This is the best ratio on the table. |
| Chase Ultimate Rewards | No. This bonus is on Amex’s side. | Your Chase balance is the surplus, or you hold a 1:1 Hyatt card and would rather not touch it. Confirm the ratio Chase shows you. |
| Capital One miles | No | You do not have Membership Rewards, or your Venture miles are the ones you can afford to strand. |
| Citi ThankYou Points | No | Same test: spare balance, live ratio, seat already found. |
If you hold both Amex and Chase, spend the Amex points here. A 1.25 transfer beats 1:1. Save Chase for partners Amex does not have, or for World of Hyatt if you still transfer there at 1:1. Sapphire Reserve still does. Sapphire Preferred and Ink Business Preferred do not, as of October 1 — that split is in the Hyatt ratio article.
If you are still choosing which card should earn the next hundred thousand points, this bonus is a data point, not a strategy. Compare Bilt Palladium vs Venture X, then the 2025 travel cards guide, then the optimizer on your actual spending. A 25% bonus on a currency you earn slowly loses to a 1:1 transfer of a currency you earn every month.
Pay cash when the surcharge plus the opportunity cost of the points is close to a changeable revenue fare. Wait for the next bonus if you do not have a seat. This corridor sees a transfer bonus more than once a year, and 25% is the typical high end. Missing October is annoying. Stranding six figures of Membership Rewards is expensive.
The verdict
Take the October 2026 Amex-to-Flying Blue bonus when the award is already on the screen.
Remember 36,000 Membership Rewards for a promo business Light award at 45,000 miles (Europe–Seattle, and the same mileage on Mexico City; Orlando and Cancun only if you can book the extraExclusive fare). Prefer 45,000 Membership Rewards for promo business Standard at 56,250 miles if you want a ticket you can live with. That is the same Amex cost as the Light promo without a bonus. Use the bonus to buy the better fare, not to hoard the cheaper one.
Outside the promo, transatlantic business is about 48,000 Membership Rewards in Light or 60,000 in Standard. Legitimate when the seat and the surcharge cooperate. Not a reason to pre-fund a Flying Blue account.
Do not transfer speculatively, do not transfer for a city you cannot see, and do not transfer Chase, Capital One, or Citi points expecting this 25% to appear. The ratio is hard-coded on the US Amex transfer page, the window closes October 31, 2026, and the miles are only worth more if a booking exists on the other side.
Find the seat. Read Light versus Standard. Price the cash co-pay. Then transfer exactly what that ticket requires.
This article reflects the US Amex Membership Rewards to Flying Blue transfer bonus and Flying Blue Promo Rewards as published for October 1–31, 2026, including the Light / Standard / Flex award structure introduced in Flying Blue’s September 2026 devaluation. Transfer ratios, promo routes, extraExclusive eligibility, taxes, and carrier-imposed surcharges change. Confirm the ratio on Amex’s transfer page and the fare rules on Air France or KLM before you move points. Transfers are one-way.
