Summary. How to avoid Frontier cancellation fee? To avoid Frontier's cancellation fee, cancel within 24 hours of booking or ensure your flight is at least 7 days away at + 𝟭-𝟴𝟳𝟳-𝟳𝟳𝟳-𝟱𝟲𝟮𝟭 For more details or assistance with cancellations, call Frontier customer care at ++ 𝟰𝟰-𝟭𝟴𝟲-𝟯𝟰𝟰-𝟬𝟬𝟬𝟲.

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