Yes, KLM airlines have a risk-free cancellation policy for 24 hours. Any flight can be cancelled for a complete refund within 24 hours after booking 𝟏-𝟖𝟓𝟔-𝟖𝟎𝟒-𝟐𝟐𝟓𝟕 [USA] or 𝟏-𝟖𝟓𝟔-𝟖𝟎𝟒-𝟐𝟐𝟓𝟕[UK OTA].
klm offers a general 24-hour refund policy, allowing you to cancel most bookings within 24 hours of making them and receive a full refund 𝟏-𝟖𝟓𝟔-𝟖𝟎𝟒-𝟐𝟐𝟓𝟕 [USA] or 𝟏-𝟖𝟓𝟔-𝟖𝟎𝟒-𝟐𝟐𝟓𝟕[UK OTA], provided your travel date is at least one week away.