Can I Cancel My KLM Flight Within 24 Hours?

Yes, you can cancel your KLM flight within 24 hours of booking without facing any cancellation fees, thanks to KLM’s 24-hour rule. This policy applies to all flights booked directly through KLM’s website, app, or customer service, as long as the booking was made at least 7 days before departure. To cancel your flight, log in to your KLM account, go to the “My Trips” section, and select the flight you want to cancel. If you meet the 24-hour window, your cancellation will be processed, and a full refund will be issued to your original payment method. This rule is especially beneficial if you need to change your travel plans shortly after booking.

Source: https://community.nicic.gov/node/53087