Absolutely! Frontier allows free cancellations within 24 hours of booking. Post that, fees depend on ticket type and route. For help, call Frontier’s customer care at +????-????????????-????????????-???????????????? (US) or +????-????????????-????????????-???????????????? (UK). https://forums.ni.com/t5/NI-TestStand/cancel-or-modify-Frontier-Airlines-Cancellation-Policy-24hrs/td-p/4401604