Frontier Airlines' cancellation policy frequently doesn't provide a complete reimbursement. Travel credits that can be applied to upcoming Frontier flights are frequently given as refunds. The kind of fare, the time of cancellation, and any relevant insurance or protection policies purchased will determine the availability and terms of refunds. There are cancellation costs with Frontier Airlines

https://travobravo.com/frontier-airlines/how-to-cancel-flight-on-frontier-airlines/
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https://travobravo.com/frontier-airlines/how-to-cancel-flight-on-frontier-airlines/

Cancel Frontier flight via official website through “Manage Booking” and click on “Cancel Booking”. Get a full refund on flights canceled within 24 hours.