Information, not legal advice. RefundRules summarizes US DOT rules from 14 CFR Part 260. It does not know your ticket, the airline's records, or facts you leave out. Confirm with the airline and the DOT before relying on it.
If Southwest Airlines delays your checked bag past the DOT time standard, you can ask for the bag fee back. Here is what the rule says.
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Bag fee refund is owed if a Mishandled Baggage Report is filed and the bag is not delivered within 12 hours (domestic), 15 hours (international, longest nonstop US segment 12 hours or less) or 30 hours (international, longest nonstop over 12 hours) of the last segment's arrival, or the bag is lost.
7 business days for credit card purchases; 20 calendar days for cash, check, debit card and other forms of payment. Note: the DOT consumer page says 20 business days; the regulation text says 20 calendar days.
Yes, when the bag is not delivered within the DOT time standard. The rule covers the bag fee, not other losses.
A Mishandled Baggage Report, your receipt or proof of the fee, and a written request to the airline.
7 business days for credit card purchases and 20 calendar days for other payment types.
Lost or damaged luggage claims are separate from the bag fee refund. Use the checker for the fee and keep your claim paperwork for the rest.
Official sources: DOT refunds, DOT automatic refund rule, file a DOT complaint. This page is not affiliated with Southwest Airlines.