You can cancel United Airlines flights and get a refund depending on the ticket type and timing. United allows free cancellation within 24 hours of booking if the booking was made at least seven days before the flight. This applies to all ticket types, including Basic Economy. After 24 hours, Basic Economy tickets cannot be canceled or refunded. Non-refundable tickets canceled after 24 hours usually incur a cancellation fee, which varies by route and fare class. After the fee, you may receive a travel credit valid for one year from the original issue date. Refundable tickets can be canceled anytime before the flight for a full refund to the original payment method. Refund processing may take several days. Award tickets booked with miles can be canceled, and miles redeposited, but fees may apply if you do not show up. To cancel, you can use United’s website or customer service. Always check your fare rules for details.