15% off Southwest tickets for Visa Signature cardholders

(expires April 30)

Southwest offers 15% off flights through June 1, 2011. You will need to enter your Visa Signature card number in order to get a coupon e-mailed to you. One coupon per Visa Signature card. Of course, if you have an account with, say, Bank of America that lets you generate virtual card numbers, I think there is probably no limit to the number of coupons you can get.  But you should hurry, because this offer will likely run out of coupons before April 30.