There are a number of factors which determine if international travel is deductible or not.
Here is an IRS publication which provides the information on Business Travel Deductions: https://www.irs.gov/taxtopics/tc511
Here is a link which provides information for US citizens who live or travel abroad: https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-residents-abroad-filing-requ....
