(Updated 14 May 2023)
As of 11 May 2023, the requirement to be vaccinated against COVID-19 ended for all air travelers to the US. This requirement expired on the same date for US Federal employees and Federal contractors, as well.*
From the US Embassy in London and US Consulate in Belfast, 12 May 2023:
Update on Change to U.S. Travel Policy Requiring COVID-19 Vaccination for nonimmigrant travel
"The Administration will end the COVID-19 vaccine requirements for international air travelers at the end of the day on May 11, the same day that the COVID-19 public health emergency ends. This means starting May 12, noncitizen nonimmigrant air passengers will no longer need to show proof of being fully vaccinated with an accepted COVID-19 vaccine to board a flight to the United States. CDC’s Amended Order Implementing Presidential Proclamation on Safe Resumption of Global Travel During the COVID-19 Pandemic will no longer be in effect when the Presidential Proclamation Advancing the Safe Resumption of Global Travel During the COVID-19 Pandemic is revoked."
Airline companies no longer need to collect US bound traveler attestations and review documentation on vaccination status or negative test results for COVID-19. Requirements for vaccination which started November 8, 2021 are no longer in place. Airline companies will no longer require from non-US citizens and non-US permanent residents: proof of vaccination from the NHS in the form of the machine readable QR Code "NHS COVID Pass."
Vaccination Proof No Longer Required for Foreign National Non-Immigrants to Enter the United States
Vaccination proof had not been required for US citizens and US permanent residents. Now vaccination proof will not be needed for non-citizen, non-immigrants as well.
Footnotes
[*]White House Statements and Releases, The Biden-Harris Administration Will End COVID-19 Vaccination Requirements for Federal Employees, Contractors, International Travelers, Head Start Educators, and CMS-Certified Facilities, 1 May 2023.