The 24-hour risk-free cancellation policy is applicable to all bookings made for flights made through several channels, including the airport, the reservation centre, and the official website of Sun Country Airlines.
Through the airline's website or by getting in touch with customer care, travellers who make direct reservations with Sun Country Airlines can quickly cancel their travel plans.

https://www.travomojo.com/cancellation-policy/sun-country-cancellation-policy/