Update: this popular deal may have sold out. See more deals >

Southwest is offering a slightly unusual discount voucher, valid for today only. You can save 31% on the price of any flight, good for travel on October 31 only. Just book your flights at the airline’s website and use the promo code TREAT31. These are the rules:

– Round-trip purchase required.

– 7-day advance purchase required.

– Discount applies to Wanna Get Away fares only.

– Discount is taken from your base fare; taxes and fees added separately.

– Code expires 11:59pm local time tonight.

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