While a passport is not currently required for domestic travel (travel within the United States and its territories),
effective January 22, 2018, air travelers with identification that does not meet the REAL ID Act requirements and whose state does not have an extension must present an alternative form of identification in order to board a domestic flight. Examples of acceptable forms of identification include U.S. military or dependent ID, DHS trusted traveler cards, airline or airport-issued ID, passport book or passport card, or federally recognized tribal-issued photo ID.

We highly recommend getting a passport if you don’t have one. You can find instructions for applying here. The Department of State recommends you apply early to save on fees and ensusre that you will have your passport in time for the trip.

For more information about the change in policy visit the DHS site.