In the USA do they test for covid while in transit?

I'm taking a flight from YVR to SEA. My options are a direct flight (more expensive) or a flight that stops in SFO or PDX.

I'm going to take a PCR test prior to boarding but my question is, if I take a flight that stops, should I be wary of the connection time in case something goes wrong? Do they test me for COVID again?

Best Answer

should I be wary of the connection time in case something goes wrong?

No.

You need to show your test at check-in before boarding the first leg of your flight. Then you get your boarding passes and you are all set. There is no need to retest even if you miss your connection.

Test sample must be taken 3 days before departure (not arrival).

https://www.cdc.gov/coronavirus/2019-ncov/travelers/testing-international-air-travelers.html