U.S. nationals, including U.S. dual nationals, must use a U.S. passport to enter and leave the United States.
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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.
According to the UK government, the United States is among the visa-waiver nations. Therefore, as a U.S. citizen, you can enter the territory of the United Kingdom for a period of up to 6 (six) months with no need to apply for a visa. But, of course, a valid U.S. passport is required.
The U.S. passport book and U.S. passport card are both accepted as ID for domestic flights. You may not have heard about the U.S. passport card before. The passport card cannot be used for international air travel, but it is still a great ID to have in your wallet.
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. citizens under age 16 may present a birth certificate or alternative proof of citizenship when entering by land or sea. All travelers must have a passport book for international air travel. Please note that hospital-issued birth certificates, voter registration cards, and affidavits cannot be used.
While you will not need a visa before you visit the UK for less than six months, it is highly advised that you bring documentation similar to that which you would provide for a visa application. This can include evidence of your flight home and the amount of savings you have to support yourself.
If you are traveling within the next two weeks, you may be able to visit the U.S. Passport Office for same-day or next-day processing. Please contact my office for additional assistance. My office is always available to assist you with the issuance or renewal of your passport.