24 Hour Cancellation Policy
Sun Country Airlines will allow a customer to cancel a reservation made directly with Sun Country Airlines reservations staff or on our website without penalty for up to 24 hours from the time of making the initial reservation provided the reservation is made more than 7 days (168 hours) in advance of flight departure.
Link- https://medium.com/@willjames2651/s-ya-c-fees-p-y-ultimate-b95a52f758ac