These are YA novels with time loops, time travel, or alternate timelines. For more time travel YA, click here.
Me, Myself & Him by Chris Tebbetts
If I See You Again Tomorrow by Robbie Couch
Going Bicoastal by Dahlia Adler
Another Dimension of Us by Mike Albo
Against the Stars by Christopher Hartland
Bonus: Coming in August, Pride and Prejudice and Pittsburgh by Rachael Lippincott, and in 2024, Time and Time Again by Chatham Greenfield