What is the 24 hour rule for KLM?

Passengers can receive a full refund if they cancel their flight at least 24 hours before departure. Southwest Airlines offers refunds if you cancel your flight at least 3 hours before departure. If you booked a ticket for travel to or from the US, the refund will be credited within a week. Here are some key points of Southwest Airlines’ 24-hour cancellation policy:
If your flight is canceled due to unavoidable situations like weather or natural disasters, you can get a full refund.
Southwest Airlines allows passengers to receive a full refund for tickets booked through the airline.
Any unused airfare can be converted into eCredit, which can be used for future flights.
Passengers can make changes to their flights without paying the $200 cancellation fee.
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