Bank rewards · By Points Frog Editorial ·
A 25% transfer bonus and a 25% reduction in bank points are different calculations. The bonus multiplies the miles received by 1.25. For a fixed mileage target, dividing by 1.25 reduces the required input by 20%.
Flying Blue’s current US Amex partner page lists a 25% transfer promotion through October 31, 2026. The example below explains the arithmetic; the account’s actual ratio, increments and eligibility still determine a real transfer.
Work backward from the award target
Suppose an award needs 50,000 miles and the ordinary transfer ratio is one point to one mile. Without a bonus, the required input would be 50,000 points, assuming no existing airline balance.
With a 25% bonus, divide 50,000 by 1.25. The result is 40,000 points. The input falls by 10,000, which is 20% of the original 50,000-point requirement.
Multiplying 40,000 by 1.25 confirms the output: 50,000 miles. This check helps keep the bonus on the receiving side of the calculation rather than subtracting the wrong percentage from the input.
Apply the bonus to the shortfall
If the airline account already contains 12,000 miles, the shortfall for the same award is 38,000. At the assumed base ratio and bonus, divide 38,000 by 1.25 to obtain 30,400 points before increment rules.
If the real transfer must use 1,000-point increments, the member would need to round according to those rules. A 31,000-point transfer at the illustrative ratio would produce 38,750 miles, leaving 750 beyond the shortfall.
The remainder is part of the transaction. It is not evidence that the ticket itself became cheaper in miles. The award still requires its quoted mileage amount.
Include the other booking inputs
A transfer bonus does not remove the ticket’s cash charges. Record taxes, fees and any applicable transfer cost alongside the bank points required.
Also search the actual passenger count and travel dates. A mathematical transfer target is useful only when the intended award is available and suitable. A promotional deadline does not hold a seat.
Review the fare conditions before moving points. Baggage, flexibility and lounge eligibility belong to the ticket rather than the percentage displayed on the transfer promotion.
Check the final preview
Use the offer shown in the member’s own account. The final preview should identify the points sent and expected miles received, including the applicable bonus.
The reusable method is to subtract the existing miles from the award target, divide the shortfall by the actual conversion multiplier, and apply the transfer increment. That turns a percentage headline into a precise input calculation, with the booking’s availability and conditions checked separately.
Plan the rest of the journey
Use the Membership Rewards calculator and program directory for broader rewards context. The calculator’s valuation is an estimate; the actual booking supplies the points required and cash charges. For the flight segment, Lounge Frog’s airline page and CDG airport guide provide existing travel resources. Check the lounge directory separately: an award booking alone does not establish entry to every lounge.
Source: Official program information. Checked October 13, 2026. Numerical examples are hypothetical unless explicitly identified as a published program rule.