Capital One's 30% Transfer Bonus to Japan Airlines Ends September 30

Through September 30, Capital One is adding a 30% bonus when you move miles to Japan Airlines Mileage Bank, and this is a genuine sweet spot for premium cabins, as long as you know the transfer is not one to one.

• The catch to know first: Capital One to JAL is normally 1,000 to 750, not 1 to 1. With the 30% bonus, 1,000 Capital One miles become 975 JAL miles for now.
• Why it is still worth a look: JAL Mileage Bank is one of the best ways to book Japan Airlines and other oneworld premium cabins, and even below one to one, the bonus meaningfully narrows the gap.
• Transfer only with a plan: confirm your JAL award space first, then move exactly what the booking needs. Transfers are one way and cannot be reversed.