Question: how many united mileageplus miles needed to upgrade?
Answer: Calculating the Necessary Miles For example, upgrading a one-way domestic flight within the Continental U.S. will cost 7,500 miles for a Y fare or 20,000 miles for a S, T, K, L, G, or N fare. There are other levels in between. These upgrades also require a co-pay that ranges from $0 to $250.