How to answer "Did we live in the U.S. for more than 6 mo.." if one of us went foreign for vacation and unable to return in 6 months due to covid flight restrictions

[DaveF1006]

This was an unforeseen event that prevented you from coming back to the US. My suggestion is to say yes to the question and not count the days you were restricted from coming into the country.

[Carl]

Depending on your citizenship and reason for leaving the U.S. in the first place, being out of the country does not necessisarily mean you were not living here for the entire year, or at least 6 months. For example (and this example may not apply to you) if you were in another country on a tourist visa and got "trapped" because of flight restrictions, your primary country of residence is still the U.S. for the entire tax year.

Now if your post is pertaining to the foreign earned income exclusion, that may change things. You'd need to provide more details so that the reader has more facts to work with in that case.