Key Points

  • Chase ran a 20% transfer bonus to Air France-KLM Flying Blue from late August through September 30, 2025, turning 1,000 Ultimate Rewards points into 1,200 Flying Blue miles.
  • The bonus was useful for a narrow set of redemptions, mostly off-peak Europe economy and Flying Blue Promo Rewards, but Chase to Flying Blue bonuses are rare and worth waiting for.
  • The next likely window is whenever Chase rotates its quarterly transfer promos, so set an alert at Frequent Miler and TPG and have a redemption picked out before you transfer.

TL;DR

Chase ran a 20% Flying Blue transfer bonus in September 2025. It was a fine bonus, not a great one. Flying Blue's sweet spots are Promo Rewards and off-peak Europe economy. Chase rarely repeats this transfer pairing, so plan ahead.

What the bonus was

Back in September 2025, Chase ran a 20% transfer bonus from Ultimate Rewards to Air France-KLM Flying Blue. The window opened late August and ran through September 30, 2025 at 11:59 PM ET. Transfer 1,000 Chase points, end up with 1,200 Flying Blue miles. Minimum transfer 1,000 points, instant most of the time, occasional log-out-and-back-in to make the miles show up.

That was the whole offer. Not a 30% bonus. Not a "drop everything" event. A solid, mid-tier promo that quietly opened and closed without much drama.

For context on the year that surrounded it: Chase had also run 20% to Flying Blue in January 2025, and a 25% bonus had run in May 2025. Three Flying Blue promos in one calendar year was actually unusually busy for Chase. The pairing normally surfaces once or twice and then disappears for a year-plus stretch. If you missed September 2025, you probably waited until well into 2026 to see another one, and that is why this matters even now: knowing what these bonuses look like when they appear, and what they are worth, is how you avoid impulse-transferring the next time one shows up.

A worked Flying Blue sweet spot

The reason Flying Blue gets attention from points nerds isn't the standard award chart. It's the Promo Rewards. Every month, Flying Blue publishes a list of routes at 25% to 50% off, and the floors get genuinely interesting. US to Europe in economy has shown up at 12,500 miles one-way during Promo Rewards months. That's not a typo, and it's the cheapest legitimate way to fly to Europe on points that I track.

Run the math with the September 2025 bonus stacked on top. A US-to-Europe Promo Rewards economy seat at 12,500 miles needed only 10,417 Chase points after the 20% bonus, plus roughly $200 in taxes and fuel surcharges depending on the route. Even at the standard non-promo rate, a Detroit-to-Paris economy redemption at 50,000 miles needed only 41,667 Chase points after the bonus, with taxes typically landing around $200 to $250.

Where Flying Blue stops being interesting is business class to Europe. Award space in J on Air France and KLM has been brutal for two-plus years, and a transfer bonus doesn't fix availability. That part of the chart looks great on paper and is nearly impossible to actually book.

Why Chase rarely runs Flying Blue bonuses

Chase's transfer partner promos lean heavily toward Hyatt, Air Canada Aeroplan, Marriott Bonvoy, and Virgin Atlantic. Those four make up the bulk of Chase's promo calendar in any given year. Flying Blue gets one, maybe two slots, and there's a structural reason: Flying Blue is also an Amex transfer partner, a Citi transfer partner, and a Capital One transfer partner. Air France-KLM doesn't need to pay Chase to drive transfers when four banks all feed the same loyalty program.

So when Chase does run a Flying Blue bonus, it's usually shorter, smaller, and lighter on the marketing than the Hyatt or Aeroplan promos. September 2025 fit that pattern.

Where to watch for the next one

If you want to catch the next Chase to Flying Blue bonus the moment it drops, three watch points:

  1. Frequent Miler's transfer bonus tracker. Updated within hours of any new promo. The single best source.
  2. Chase's own Ultimate Rewards portal. Banner promos appear inside the transfer flow before they hit blogs.
  3. TPG and Doctor of Credit alerts. Both push notifications fast. Set a keyword filter for "Flying Blue" if you use either.

Have your redemption picked out before you transfer. Flying Blue miles expire after 24 months of inactivity, point transfers do not count as activity, and dynamic pricing means the seat you priced last week may cost more this week. Speculative transfers into Flying Blue are how points die.

The takeaway

The September 2025 Chase to Flying Blue 20% bonus was a fine, narrow promo that helped if you had a specific Promo Rewards redemption or an off-peak Europe economy plan, and was a pass for almost everyone else. The bigger lesson is the meta one: Chase to Flying Blue promos are rare, modest, and best used surgically. When the next one lands, know your route, run the math, transfer once, book immediately.

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