Air France KLM's Flying Blue program has launched a new "mystery offer" for buying miles, giving members either up to an 80% bonus or a discount of up to 45% on their purchase. The offer runs through September 16, 2026, and which deal you get depends on your account — you'll only find out after logging in. Personally, I received the discount offer, which is slightly weaker than past promotions that offered a 100% bonus or a 50% discount, but it can still be worthwhile if you're short on miles for a specific redemption.
How the Two Offers Stack Up
The discount offer is tiered based on how many miles you buy: purchase 4,000 to 10,000 miles for a 35% discount, 15,000 to 20,000 miles for a 40% discount, and 25,000 or more miles for a 45% discount. On the bonus side, buying 4,000 to 20,000 miles nets you a 50% bonus, 22,000 to 48,000 miles gets you 60% bonus, and 50,000 or more miles gives you an 80% bonus. At the 45% discount level, you're paying just under 1.68 cents per point, while the 80% bonus option costs about 1.69 cents per point — nearly identical pricing.
For context, Flying Blue's A Plague Tale promo rewards often offer better redemption value than what you'd pay for miles at these rates, making this a solid option if you're topping off your account for a specific flight or upgrade. Past offers have been more generous, but this one still beats buying miles at the standard rate without any promotion.
When Buying Miles Makes Sense
This deal is best for travelers who are close to a redemption and need a small boost, rather than those looking to stockpile miles speculatively. If you're eyeing a Call of Duty trip to Europe or a business-class upgrade, calculating the cash value of the miles against the ticket price is essential — you want to ensure you're not overpaying. The key is to compare the cost of buying miles with the cash price of the same flight; if the miles cost less, it's a win.
Frequent flyers should also consider Flying Blue's Promo Rewards, which offer discounted award seats on select routes. These can provide exceptional value, and buying miles at this rate can make those redemptions even sweeter. Just remember that miles are non-refundable and expire after 24 months of inactivity, so don't buy more than you plan to use.
A Slightly Weaker Offer, But Still Worth It
Compared to previous Flying Blue promotions that offered a 100% bonus or 50% discount, this deal is a step down — but it's still a solid opportunity for those with a specific redemption in mind. The mystery element adds a bit of suspense, though most members will likely see the discount offer, as it's more common in these campaigns. If you received the bonus offer, the 80% bonus on 50,000 miles effectively gives you 90,000 miles for the price of 50,000, which is a strong value.
For Amazon Prime members or those who use Apple One, this is a straightforward way to boost your travel options without a subscription. The offer ends September 16, 2026, so there's plenty of time to decide, but don't wait too long — these deals tend to pop up periodically, and missing this window means waiting for the next one.
The Bottom Line for Travelers
If you're planning an Air France or KLM flight and need miles to secure a better fare or upgrade, this offer is a reasonable buy — especially if you qualify for the 45% discount or 80% bonus. Just run the numbers against the cash price of your ticket to ensure you're getting value. For casual travelers without an immediate redemption in mind, it's better to pass and wait for a stronger promotion. Either way, it's a reminder that loyalty program miles are most valuable when used strategically, not hoarded.
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