Delta Airlines understands that travel plans can change. If you miss your flight, Delta may allow you to stand by for another flight on the same day or rebook for a later time, depending on availability and fare type. It’s crucial to notify Delta as soon as possible—either online, through the Fly Delta app, or at the airport desk. For refundable or flexible tickets, rebooking is often easier, while non-refundable tickets may incur change fees or result in a loss of ticket value. In case of emergencies, Delta may waive fees on compassionate grounds.