At My Coke Rewards, get a discount code good for $20 off Southwest Airlines Round-Trip Fares for 50 My Coke Rewards points. It's the first airfare discount deal we've seen from My Coke Rewards. The code is good on most Wanna Get Away fares when purchased by December 31 for travel between January 1 and March 12, 2010. Some restrictions apply; click here for more details.