Effective January 26, all airline passengers to the United States ages two years and older must provide either a negative COVID-19 viral test taken within three calendar days of travel or provide a positive test result and documentation from a licensed health care provider or public health official of having recovered from COVID-19 in the 90 days preceding travel. Passengers must also attest, under penalty of law, to having received a negative qualifying test result or to recovery from COVID-19 and medical clearance to travel.   
Airlines must deny boarding to passengers who do not meet these requirements.
If you are planning to return to the U.S., you should contact your airline for specific information about testing requirements for travelers. Because airlines may adopt and modify their own specific policies to implement CDC’s new rule, you should contact the carrier for your U.S.-bound flight and not rely on information from other carriers or information or experience from previous trips.
For the latest updates and for information on where to get COVID tested in Laos, please also read the U.S. Embassy in Laos’ COVID-19 information page.