
You can redeem your Capital One Miles by transferring them to other loyalty programs. The transfer rate varies depending on the airline/hote.
And now, through December 1, 2021, there is a 20% transfer bonus when you transfer your Capital One Miles (from Venture cards or Spark cards) to Air France Flying Blue.
With this offer, for every 1,000 Capital One miles you transfer to Flying Blue, you get 1250 Flying Blue miles compared to the usual 1000.