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Southwest Airlines is offering 31% off for flights on Halloween Day – October 31st. The one caveat is that only round trip flights qualify. You must enter promo code TREAT31.
It is unclear if this sale is for today only or today and tomorrow, the terms state:
Discount is valid on new reservations only and purchase must be made starting September 16, 2013 and prior to 11:59 pm for the respective time zone of the originating city on September 17, 2013. Travel
If you already have a flight booked that hadn’t yet gone up in price you can cancel and rebook!