In an interview with CNN, US Transportation Secretary Pete Buttigieg said travellers are entitled to automatic cash refunds, which have to be prompt.
The rules, announced by the Transportation Department today, also require airlines to provide upfront information about fees for baggage and changing flights.
Although many airlines have done away with change fees and disclose fees on their websites, Mr Buttigieg estimated that more transparency with some airlines and websites would make it easier for travellers to shop around.
The rule would formalise the requirement that passengers receive refunds if a domestic flight is delayed by more than three hours or if an international flight is delayed by more than six hours.
It would also require a refund of any baggage fees for bags that arrive more than 12 hours late and a refund of the fee for a purchased service like Wi-Fi or upgraded seating if the airline doesn't deliver.
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