Beginning on January 26th, all air passengers arriving to the US from a foreign country are required to get tested for COVID-19 no more than 3 days before their flight departs and to provide proof of the negative result or documentation of having recovered from COVID-19 to the airline before boarding the flight.
Travellers will need to be tested with a viral test (NAAT or antigen test) to determine if they are currently infected with COVID-19. Also, travellers will need to ensure that they receive their results before their flight departs and have paper or electronic documentation to show the negative result to the airline. The test result documentation must include information that identifies the person, a specimen collection date and the type of test.
Airlines must confirm the negative test result or documentation of recovery for all passengers before boarding. If a passenger chooses not to provide a test result or documentation of recovery, the airline must deny boarding to the passenger.
If you are arriving on a direct flight to the US, your test must be done within the 3 days before your flight to the US departs. If you are arriving to the US via one or more connecting flights, your test must be done in the 3 days before the first flight in your itinerary, but only if the connecting flights were booked as a single passenger record with a final destination in the US and each connection (layover) is no longer than 24 hours long. If your connecting flight to the US was booked separately or a connection in your itinerary lasts longer than 24 hours, you will need to get tested within the 3 days before your flight that arrives in the US.
If your flight is delayed before departure, you will need to get re-tested if the delay causes your test to fall outside of the 3-day pre-departure testing period requirement.
Even those travellers who have received a COVID-19 vaccination will still be subject to the negative COVID-19 testing requirement.
More detailed information from the CDC can be accessed here,
The CSA is monitoring this matter closely and will provide further updates when more information is available.