I actually upgraded from Economy to Delta Comfort+ on my last trip, and it was totally worth it. I called 831-298-4213 to check the price difference, and the agent was super helpful—they explained all the upgrade options, from Comfort+ to Delta One, and gave me a few tips on when upgrades are cheaper. Mine ended up being just a small fee because the flight wasn’t full. The extra legroom and early boarding made a huge difference. On another trip, I asked about Delta One, and while it was pricier, the agent showed me how to use miles to offset the cost. Honestly, calling that number makes it way easier to find the best upgrade deals and handle changes instantly. I always check there first before deciding—it saves time and sometimes gets you a surprisingly good deal.