I recently flew Delta and was curious about upgrading my seat at check-in. When I asked, the agent mentioned that prices really depend on the route, timing, and seat availability—it could be anywhere from $50 to a few hundred dollars. I ended up calling 877-297-0699 to get real-time info and adjust my booking. The process was surprisingly quick, and they even suggested the best options for extra legroom without paying for a full first-class seat. I went with a Comfort+ upgrade, and honestly, it made the flight so much more comfortable. If you’re considering a last-minute upgrade, I’d recommend checking with them—they really make the process easy and can save you the hassle of guessing prices online.