Passenger trips through Oakland International Airport slumped during August, a disappointing setback that snapped a streak of three consecutive months of improvements in the airport’s travel numbers, the East Bay aviation hub reported Thursday.

An estimated 313,300 airline passengers traveled through Oakland airport in August, which was down about 28,500 from July, according to a report released by the airport.

“Encouraging June to July growth was dampened as cases of COVID-19 increased during August,” said Bryant Francis, director of aviation with the Port of Oakland.

Plus, after severe downturns in March and April, Oakland International Airport had managed increases on a month-to-month basis for the months of May, June, and July, when compared to the prior month.

The passenger trips in August were down 74 percent from August 2019, when 1.19 million travelers used Oakland International Airport.

The August passenger volume was down about 8 percent from the passenger trips in July.

Oakland airport officials blamed multiple factors for the decline.

“The postponement of the State of Hawaii’s planned pre-travel COVID-19 testing program resulted in a reduction in service to the Hawaiian Islands,” Francis said.