Although you don't have to carry your passport to get into Hawaii, you do need a government-issued photo ID to get on the airplane. Also, if your itinerary includes travel through other countries – either before or after Hawaii – you do need to include your passport when you pack your bags. read more
A Passport is Universal Identification. Although you don't have to carry your passport to get into Hawaii, you do need a government-issued photo ID to get on the airplane. read more
To answer the question simply, if you are a legal US citizen, then you may fly to Hawaii without needing a passport, just like flying to another state. read more