In addition to Real ID-compliant driver's licenses and identification cards, the following documents are also acceptable for flying within the United States: S. passport or passport card. DHS trusted traveler cards (e.g., Global Entry, NEXUS, SENTRI and FAST)

To fly Southwest Airlines domestically in 2026, all passengers aged 18 and older must present a REAL ID-compliant government-issued photo ID. This is a critical requirement as of May 7, 2025; standard driver's licenses that are not "REAL ID" (marked with a gold star) are no longer accepted at TSA checkpoints. If you don't have a REAL ID, a valid U.S. Passport, Global Entry card, or permanent resident card is required. For 2026 travelers who find themselves without a valid ID, the TSA has introduced the "TSA ConfirmID" service, which allows identity verification for a $45 fee in some cases. For international Southwest flights (e.g., to Mexico or the Caribbean), you must have a valid Passport that matches the name on your booking exactly. Additionally, if you are traveling with a "lap child" under age 2, Southwest requires you to bring a copy of the child's birth certificate to verify their age at the check-in counter.