Credit card transfer bonuses (September): 40% to Copa Airlines, 30% to British Airways, 30% to Hilton and more

Transfer bonuses can offer lucrative opportunities to help you maximize your points and miles and work your way toward fantastic award redemptions. You can sometimes get significantly more value from your rewards by transferring them to an airline or hotel partner during one of these bonus periods.Remember, though, that these are limited-time offers: You'll need to act fast if you find one that suits your travel plans.We've compiled transfer bonus updates for most major programs with transferable rewards to make it easier to track these offers. Just note that transfer bonuses are sometimes targeted, so some may not be available to you.Active credit card transfer bonusesWe're currently seeing these transfer bonuses:Transfer fromTransfer toBonus details End dateTransfer ratioAmerican Express Membership RewardsBritish Airways Club, Iberia Club or Aer Lingus AerClub30%Sept. 271,000 points equals 1,300 AviosAmerican Express Membership RewardsHilton Honors30%Oct. 141,000 points equals 2,600 pointsCapital One milesJapan Airlines Mileage Bank30%Sept. 301,000 miles equals 975 milesChase Ultimate RewardsAir Canada Aeroplan20%Sept. 301,000 points equals 1,200 pointsCiti ThankYou RewardsLeader...