What is Frontier Airlines Cancellation Policy
https://www.devex.com/people/what-is-frontier-airlines-cancellation-policy-2045760
Frontier does not offer fully refundable fares. However, you can receive a full refund if you cancel within 24 hours of booking at (+1-844-488-0875 ) (USTM) ⇋ (+1-844-488-0875 ) (UKTM), and the flight departs at least seven days later. Afterward, refunds are given as travel credits.
What is Frontier Airlines Cancellation Policy