No, it is not necessary to have a passport to travel to Hawaii from the mainland United States. Hawaii is one of the 50 states of the United States, and travel between Hawaii and the mainland is considered domestic travel. For U.S. citizens, a government-issued photo identification, such as a driver’s license, is sufficient for travel between Hawaii and the mainland. However, if you are traveling from a U.S. territory or a foreign country, you will need a valid passport or other acceptable travel documents. It’s always a good idea to check the latest travel requirements and documentation guidelines before your trip, as they can be subject to change.