United Air Lines offers a 24-hour risk-free cancellation policy" 1-844 UNITED-LINE (604~2944) / 1~844~604~2944 (???????????????????? ????ℴ????????ℯ????????) , allowing customers to cancel their flight within 24 hours of booking for a full refund. This applies if the ticket was bought directly from United and the departure date is at least seven days away. This policy covers all ticket types, including Basic Economy.