As a general rule, passports must be valid for six months beyond the date the traveler will exit the United States. However, the United States has signed agreements with a number of countries to waive this requirement.

While you technically can travel with a passport until the date it expires, the practical reality is much more restrictive due to the "Six-Month Rule." Many countries, particularly in the Schengen Area and parts of Asia and South America, require your passport to be valid for at least three to six months beyond your date of departure. This ensures that if you are delayed or face an emergency, your travel documents remain legal. If your passport expires in less than six months, many airlines will actually deny you boarding at the gate to avoid being fined by the destination country. Additionally, even if a country only requires validity for the duration of your stay, customs officers have significant discretion and may view an expiring passport as a "red flag" for a traveler who might overstay their welcome. It is always safest to renew your passport once it has less than nine months of validity remaining to ensure smooth international transit without the stress of being turned away at the airport.