CDC Requires Negative COVID-19 Test for All Air Passengers Entering U.S. Advertisement Incoming passengers will need to show a negative test results within three days prior to departure. January 17, 2021 • By Centers for Disease Control and Prevention CDC Expands Negative COVID-19 Test Requirement to All Air Passengers Entering the United States The Centers for Disease Control and Prevention is expanding the requirement for a negative COVID-19 test to all air passengers entering the United States. Testing before and after travel is a critical layer to slow the introduction and spread of COVID-19. This strategy is consistent with the current phase of the pandemic and more efficiently protects the health of Americans.