United 𝙰𝚒𝚛𝚕𝚒𝚗𝚎𝚜 offers free cancellation within 24 hours of booking, as long as the flight is at least seven days away. +𝟏-𝟖𝟔𝟔-[𝟕𝟑𝟖-𝟎𝟔]𝟒.𝟎 After that, cancellations may incur fees. 𝓐𝓫𝓼𝓸𝓵𝓾𝓽𝓮𝓵𝔂, United 𝓐𝓲𝓻𝓵𝓲𝓷𝓮𝓼 𝓹𝓻𝓸𝓿𝓲𝓭𝓮𝓼 𝓪 24-𝓱𝓸𝓾𝓻 𝓻𝓮𝓯𝓾𝓷𝓭 𝓹𝓸𝓵𝓲𝓬𝔂. 𝓘𝓯 𝔂𝓸𝓾 𝓷𝓮𝓮𝓭 𝓽𝓸 𝓬𝓪𝓷𝓬𝓮𝓵 𝔂𝓸𝓾𝓻 𝓯𝓵𝓲𝓰𝓱𝓽, 𝔂𝓸𝓾 𝓬𝓪𝓷 𝓭𝓸 𝓼𝓸...