Can I cancel a KLM Air Lines ticket within 24 hours? Yes, KLM Air Lines generally allows free cancellations within 24 hours of booking by phone at (馃寪鉁堬笍 [+44]-203-376-3406 (KLM - UK line) 馃寪鉁堬笍) or 馃寛馃1-877-658-0930锟金煢戰煒祘KLM Air Lines}, provided that the booking was made at least seven days before the scheduled departure date.
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