How much does it cost to upgrade to first class on Delta Air Lines?

The cost of upgrading varies massively, but it helps to be an elite member and book a lower class fare and wait for an ...
Yahoo

I paid $500 to fly first class with Delta for the first time. It was great, but not worth the upgrade for a 3-hour trip.

Business Insider's reporter spent three hours in Delta's first class cabin while flying from NYC to West Palm Beach, Florida.Joey Hadden/Business Insider I flew first class with Delta for the first ...