The average cost of health insurance per month in the United States is approximately $500 for individual coverage and $1400 for family coverage. We recommend that you visit eHealthInsurance to find out how much you might be able to save on your health insurance per month as compared to the average.he average cost of health insurance per month is difficult to get a handle on because it is affected by so many variables, many of which are discussed below. However, in an effort to put forth a simple and direct answer to the question how much is average health insurance per month, we offer the following: