From my experience, Priceline Express Deals are usually non-refundable, so cancellations can be tricky. I found that out when I booked one for a quick Vegas trip but ended up needing to cancel after my work schedule changed. Online, it looked like I was stuck, but I decided to call 866-204-0803 just to see if there was any wiggle room. The rep was super helpful—while they confirmed Express Deals are mostly non-changeable, they still walked me through my options and managed to help me switch to a different flight at a small fee. It wasn’t a full refund, but it saved me from losing the entire ticket. Now I always keep that number handy—it’s the fastest way to instantly book, cancel, or modify flights when plans change, especially with deals that come with stricter rules.