According to the Center for Disease Control and Prevention flu activity peaks between December and February, but it can last as late as May.
AAA is urging travelers to take precautionary measures to protect themselves from getting sick.
These tips include the obvious like get vaccinated at least two weeks before traveling, but they also advise that you monitor activity in the county you may be visiting and get vaccinated accordingly. Another tip is to avoid traveling if you are already sick with flu-like symptoms, as to not infect others that may be on vacation.
If you enroll in the Smart Traveler Enrollment Program, you can stay up to date on any travel advisories and alerts.