If you have a Visa Signature credit card, you can save 15% off your next Southwest Airlines Wanna Get Away roundtrip fare.

To get this discount, enter your card number and e-mail at www.visa.com/signaturesouthwest and you will be sent an e-mail containing a single-use promo code good for 15% off a round-trip Southwest ticket. Some restrictions do apply. Purchase must be made between January 20, 2011 and April 30, 2011 for travel between January 20, 2011 and June 1, 2011 and the ticket must be for a Wanna Get Away Fare. Blackout dates include February 17-28, April 21-25 and May 20-25, 2011.

If you have more than one Visa Signature credit card, each card is eligible to receive a single-use promo code. In addition, each code can be applied to the purchase of tickets for up to eight passengers on the same PNR on southwest.com.