Southwest is offering double Rapid Rewards from April 7 through May 26th.

Registration Required

You can register here.

Details

Take advantage of our Double Credit Days promotion—one bonus Rapid Rewards credit on every flight you take on Southwest Airlines. That means you can earn two credits for every one-way flight (four credits when you travel roundtrip) from any city that Southwest serves. At that rate, you’ll earn a free flight* to any of more than 65 destinations after just four roundtrip flights!

Purchase a Business Select Fare with this promotion, and you’ll receive 2.25 credits for shorthaul flights and 3.0 credits for longhaul flights.

• Register for this promotion between April 7 and May 26, 2010.
• Book a flight for yourself between April 7 and May 26, 2010.
• Complete your travel between April 7and May 26, 2010. 

Terms and Conditions

*The Rapid Rewards Award is free, but travel is subject to the government-imposed September 11th Security Fee of up to $10 per roundtrip.  Travel good on Southwest Airlines published, scheduled service.

One additional credit per one-way will be issued for all fares, except Business Select.  Business Select Customers will receive 2.25 credits for flights less than 750 miles and 3.0 credits for flights 750 miles or more.  Member must register for this promotion between April 7 and May 26, 2010 to qualify, and registration must be completed prior to commencement of travel.  Valid on new reservations only.  Reservation must be booked between April 7 and May 26, 2010.  Qualifying travel must be completed between April 7 and May 26, 2010.  Rapid Rewards account number must be entered at the time of booking.  Members will receive one bonus credit per qualifying one-way flight.  Travel on an Award or Companion Pass does not qualify for promotion.  Bonus flight credits do not count toward A-List qualification.  Rapid Rewards credit will post to your account within four days of completing travel.  Changes made to the itinerary after purchase may eliminate qualification for this promotion.  All Rapid Rewards rules and regulations apply.  BN024

(Hat tip to Lucky)