As has been mentioned in many similar posts, this is the same response you would have received from any other domestic airline. No cash refunds on non-refundable tickets, credit in the form of travel funds good for one year after original purchase date. I do suggest waiting until the day of departure to cancel, if something changes such as policy change or Southwest cancels the flight you may be able to receive an extension or cash refund, it's doubtful, but possible. --TheMiddleSeat
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