If you've purchased nonrefundable tickets, be aware that each passenger will have travel funds, good for one year from the date you made the purchase -- unless you applied previous travel funds or vouchers, in which case the new funds will take on the expiration date of the funds applied. Southwest may make refund exceptions in special circumstances. It's a longshot, but you can try reaching out to the refund department: For all other refund requests, including refund exceptions for nonrefundable travel: You can write our Refunds Department: Southwest Airlines Refunds Department P.O. Box 36649 Dallas, Texas 75235-1649
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