Trips within the US and Puerto Rico do not require a passport, but do need a REAL ID (or another acceptable alternative) to fly domestically in the U.S. You can use a U.S. passport, a U.S. passport card, or a military ID instead of a REAL ID. If you do not have these, you can still fly by paying a $45 fee to use the TSA ConfirmID verification process at the airport. Traveling outside the United States requires an up-to-date passport. Passports cost approximately $175 and are not included in the trip cost. To learn more about how to apply for a U.S. Passport, visit here.