Do you need a passport to fly state to state

No

Adult passengers 18 and over must show valid identification at the airport checkpoint in order to travel. Driver's licenses or other state photo identity cards issued by Department of Motor Vehicles (or equivalent) U.S. passport U.S. passport card DHS trusted traveler cards (Global Entry, NEXUS, SENTRI, FAST) U.S. Department of Defense ID, including IDs issued to dependents Permanent resident card Border crossing card DHS-designated enhanced driver's license Federally recognized, tribal-issued photo ID HSPD-12 PIV card Foreign government-issued passport Canadian provincial driver's license or Indian and Northern Affairs Canada card Transportation worker identification credential U.S. Citizenship and Immigration Services Employment Authorization Card (I-766) https://www.tsa.gov/travel/security-screening/identification