If you're traveling internationally, the short answer is no, you cannot use an expired passport. You must renew your passport if it's expired or will expire within the next six months.
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U.S. nationals, including U.S. dual nationals, must use a U.S. passport to enter and leave the United States. U.S. dual nationals may also be required by the country of their foreign nationality to use that country's passport to enter and leave that country.
U.S. citizen children under the age of 16 (or under 19, if traveling with a school, religious, or other youth group) must present a valid passport, birth certificate or other proof of citizenship. The birth certificate can be original, a photocopy, or a certified copy.
Yes, you can book and pay for the flight. However, you'll need a valid passport in order to check-in, so be sure to leave enough time to receive your new passport. If you don't get your passport in time, you'll lose any money you've paid for your ticket that isn't refundable or lost to change fees.
If your passport's time is almost up, don't wait — start the renewal process now. You can't travel while your renewal application is being processed, and you need to make sure your travel documents are valid for at least six months past the dates of any planned international trips.
You can only remain outside the United States, however, as long as you re-enter the U.S. before the expiration date printed on your travel document. The travel document is valid for one year after it's issued, typically within 150 days (in some cases longer) after submitting your application materials to USCIS.
You may book a flight before having your passport in hand. Please just make sure that you make your booking the same name/spelling as it will be on your passport. *For security reasons, you will be refused to board your flight if the ticket and the passport name/spelling are not the same.
Answer: United States passports are valid until midnight on the date of expiration. You can legitimately travel on the date your passport expires without any problems.