United is known for offering its cheapest flights on off-peak days, particularly on Tuesdays, Wednesdays, and Saturdays. These days tend to have fewer travelers, allowing....
https://support.us.edu/hc/en-us/community/posts/27005670360343--Travel-Guide-What-is-the-cheapest-day-to-buy-flights-on-United

What is the cancellation policy for United Airlines? United Airlines provides a 24 hour cancellation policy. If you need to cancel your United flight, you....
https://community.smartsheet.com/profile/203404/UnitedCancellations

United is known for offering its cheapest flights on off-peak days, particularly on Tuesdays, Wednesdays, and Saturdays. These days tend to have fewer travelers, allowing....
https://www.transfermarkt.com/-travel-guide-what-is-the-cheapest-day-to-buy-flights-on-united-/thread/forum/659/thread_id/2624/page/1#anchor_2844

Yes, United Airlines offers a 24-hour risk-free cancellation policy You can cancel any flight within 24 hours of booking for a full refund , as....
https://www.transfermarkt.com/-ua-policy-what-is-the-cancellation-policy-for-united-airlines-instant-cancel-amp-amp-refunds/thread/forum/659/thread_id