Today only, Southwest Airlines cuts 40% off select roundtrip Wanna Get Away Fares via coupon code "EARLYDEAL". (The discount can apply to flights for up to 8 people.) That's the largest percent-off discount we've seen for this airline since August, when it took 50% off. The coupon code is good towards travel on Tuesdays and Wednesdays from December 11 until February 12, 2013. Blackout dates and additional taxes and fees apply.