WASHINGTON, May 1 -- Mortgage rates in the United States moved higher this week, ending a three-week decline as global energy market volatility and inflation concerns pushed borrowing costs upward.

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According to the latest market update, the average 30-year fixed mortgage rate climbed to 6.3%, reversing the downward trend seen over the past three weeks. The 15-year fixed mortgage rate also increased, rising to 5.64% from 5.58% a week earlier.

Analysts linked the rise in mortgage rates largely to higher oil prices, which surged amid escalating geopolitical tensions involving the United States and Iran. Rising crude prices have renewed inflation concerns, prompting investor...