Originally Posted by acf573
I don't know the exact ratios, but it's something like 9000 points will get you a flight for $110 or less. I would much rather have a cash back card. This way, you earn your cash and you can spend it on whatever you want. With Capital One, you're more restricted because you have to redeem in fairly large chunks.
You can redeem CapitalOne miles for cash (at 1% cash back). Their miles expire, so DO make sure to redeem them prior to that.
CapitalOne does not have currency conversion fee. It is best for purchases outside of US.