The 24-hour rule
US federal law (the DOT 24-hour rule) guarantees a full cash refund on any flight booked at least 7 days before departure, as long as you cancel within 24 hours of purchase. It applies to every fare class, including Basic Economy. This is the cleanest path to a price-drop refund: rebook at the new lower fare to lock it in, then cancel the original ticket. The refund hits your card within 7 business days.

