Order your tests at least two weeks in advance of your trip to assure availability.
If you're flying to Canada, you must have a negative PCR test taken within 72 hours of the scheduled departure of your final flight to Canada.
If you're flying to the United States, you must have a negative antigen, PCR or NAAT test taken no more than 3 days before you travel by air into the United States.
You must show proof of your test results even if you have been vaccinated for COVID-19.