Do you want to know how early to cancel a ticket to get a full refund? Prior to canceling a ticket, it is quite necessary for a passenger to know the policies for cancellation so that they can save their money. Finnair 24 hour cancellation policy is one such must-know policy. According to the guidelines of this policy, it is possible for a traveler to get a full refund on a ticket canceled within 24 hours of purchase, provided, the scheduled departure of their flight is not less than 7 days from the date of cancellation. This rule applies to all destinations and fare types and classes. Also, no cancellation fee applies on tickets canceled within 24 hours.