Yes, Hawaii is strictly a domestic flight for any traveler flying from the United States mainland or its territories. Because Hawaii is the 50th U.S. state, you do not need to go through Customs and Border Protection (CBP) or show a passport when arriving from another state. However, as of May 7, 2025, you MUST have a REAL ID-compliant driver's license or an alternative like a passport to pass through the TSA checkpoint. While the flight is domestic, there is one unique "extra" step: the Department of Agriculture (USDA) inspection. When leaving Hawaii for the mainland, your carry-on and checked bags must pass through an agricultural X-ray to ensure you aren't carrying protected fruits, plants, or pests that could harm mainland ecosystems. For 2026 travelers, this means you should arrive at the HNL or OGG airport slightly earlier than a standard domestic flight, but you can rest easy knowing that your "domestic" status remains intact throughout the journey.