Generally, you cannot use a passport that does not match your current legal name for international travel. If your name has changed due to marriage, divorce, or a court order, most countries—including the U.S., UK, and India—require you to apply for a "re-issue" or a passport amendment to reflect your new identity. Security protocols at border crossings and airline check-in counters rely on a perfect match between your travel documents and your flight booking. If you attempt to travel with an old passport and a ticket in your new name, you will likely be denied boarding. However, if you have already booked a trip in your old name and your passport is still valid, you can sometimes travel by bringing original legal proof of the name change (like a marriage certificate), though this is risky and depends on the airline's specific policy. As of 2026, many frequent travelers are encouraged to update their digital travel IDs and passports immediately after a name change to avoid complications with biometrics and automated "e-gates" that are becoming the global standard for entry.