https://knowt.com/note/ea6972e4-c09d-4ebd-beb4-fe75898b982c/1-833—290—6411-Can-I-change-t
To change a flight ticket without incurring penalties, act within the 24-hour risk-free cancellation window available on most U.S.-based airlines. For non-refundable tickets, many airlines have waived change fees, but you’ll need to pay any fare difference
