Yes, you can travel to Hawaii while your Green Card (Form I-485) application is pending because Hawaii is a U.S. state, and the flight is considered domestic. Since you are not leaving the United States, there is no formal immigration or "passport control" involved in the journey. You typically only need a government-issued photo ID, such as a valid driver's license or your foreign passport, to pass through TSA security. However, immigration attorneys often issue a "word of caution": if your flight is forced to make an emergency landing in a foreign territory (which is rare but not impossible for trans-Pacific flights), you could be considered as having "departed" the U.S. without Advance Parole, which can lead to your application being deemed abandoned. To be 100% safe in 2026, many applicants wait until they have their Advance Parole (Travel Document) in hand before any flight that crosses international waters, even if the destination is a U.S. state.