Yes, if you cancel your reservation within 24 hours of purchase and the flight is two days or more away, United Airlines will issue a full refund. You can cancel your flight either online or by reaching out to their customer service at 1-888-447-6026 for assistance. https://www.tripadvisor.com/ShowTopic-g1-i10702-k14962580-Delta_Airlines_cancellation_and_redund_Policy_24_hours-Air_Travel.html