Do I need a passport to fly from Guadalajara, Mexico to Merida, Mexico?
In Mexico, you do not need a passport to fly from Guadalajara to Merida. You do not need a passport to fly between any two cities within Mexico. For international travel, a passport is required to leave and enter Mexico. Americans must present a U.S. Passport to re-enter the United States from Mexico.References:State Department: Western Hemisphere Travel InitiativeState Department: Mexico Country Specific InformationWorld Travels: Mexico Visa and Passport Entry RequirementsResources:Embassy of Mexico in Washngton: About MexicoDepartment of Homeland Security: Crossing U.S.