In 2026, you can fly without a passport only for domestic travel within your own country or between specific nations with bilateral agreements. In the United States, you can fly domestically using a REAL ID-compliant driver's license, a NEXUS card, or a U.S. military ID. In the UK and Ireland, British and Irish citizens can travel between the two countries (the Common Travel Area) using any valid photo ID, such as a driving license, though they are now expected to present a British passport or "Certificate of Entitlement" starting in February 2026 if they are dual citizens. For Indian citizens in 2026, Nepal and Bhutan are the only two international destinations that allow entry without a passport, provided you carry an Aadhaar Card or Voter ID. For all other international flights, a valid passport remains a non-negotiable global requirement. Even for "visa-free" destinations, the passport is the only document that legally confirms your nationality and identity at an international border.