Canceling a United Airlines flight depends on the fare type. While Basic Economy fares generally cannot be refunded, standard fares offer more flexibility. You may cancel within 24 hours of booking to receive a full refund. For other ticket types, fees may apply. If you’re a MileagePlus member, you might have additional benefits. Review the terms for your specific booking by visiting United’s website or contacting their support for guidance. Ensure you’re within the allowed timeframe to maximize your refund options.