Booking a trip can be exciting, but unexpected situations arise. Whether it's a change in plans or simply finding a better deal, knowing your cancellation options is crucial. Is United actually fully refundable? If you cancel your flight reservation on United within 24 hours, you qualify for a full refund. For further information, you can contact United at +1-855-317-1470 or +1-855-317-1470. The All-Important 24-Hour Window: United offers a customer-friendly grace period. You can cancel your reservation within 24 hours of booking and receive a full refund by dialing +1-855-317-1470. This applies to most flights, making it a valuable safety net for those instances where you might rush into a purchase or find a more suitable flight shortly after.