U.S. citizens need only a valid passport to enter Great Britain for stays of up to six months. If you’re within six months of your passport’s expiration date, renew it before you leave—nearly extinct passports are not strictly banned, but they make immigration officials anxious, and may cause you problems.

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Passports

We’re always surprised at how few Americans have passports—only 25% at this writing. This number is expected to grow now that it is impossible to reenter the United States from trips to neighboring Canada or Mexico without one. Remember this: A passport verifies both your identity and nationality—a great reason to have one.

U.S. passports are valid for 10 years. You must apply in person if you’re getting a passport for the first time; if your previous passport was lost, stolen, or damaged; or if your previous passport has expired and was issued more than 15 years ago or when you were under 16. All children under 18 must appear in person to apply for or renew a passport. Both parents must accompany any child under 14 (or send a notarized statement with their permission) and provide proof of their relationship to the child.

There are 24 regional passport offices, as well as 7,000 passport acceptance facilities in post offices, public libraries, and other governmental offices. If you’re renewing a passport, you can do so by mail. Forms are available at passport acceptance facilities and online.

The cost to apply for a new passport is $110 for adults, $80 for children under 16; renewals are $110. There is an additional “execution fee” of $25. Allow six weeks for processing, both for first-time passports and renewals. For an expediting fee of $60 you can reduce this time to about two weeks. If your trip is less than two weeks away, you can get a passport even more rapidly by going to a passport office with the necessary documentation. Private expediters can get things done in as little as 48 hours, but charge hefty fees for their services.

Before your trip, make two copies of your passport’s data page (one for someone at home and another for you to carry separately). Or scan the page and email it to someone at home and/or yourself.

Visas

A visa is essentially formal permission to enter a country. Visas allow countries to keep track of you and other visitors—and generate revenue (from application fees). You always need a visa to enter a foreign country; however, many countries routinely issue tourist visas on arrival, particularly to U.S. citizens. When your passport is stamped or scanned in the immigration line, you’re actually being issued a visa. Sometimes you have to stand in a separate line and pay a small fee to get your stamp before going through immigration, but you can still do this at the airport on arrival. Getting a visa isn’t always that easy. Some countries require that you arrange for one in advance of your trip. There’s usually—but not always—a fee involved, and said fee may be nominal ($10 or less) or substantial ($100 or more).

If you must apply for a visa in advance, you can usually do it in person or by mail. When you apply by mail, you send your passport to a designated consulate, where your passport will be examined and the visa issued. Expediters—usually the same ones who handle expedited passport applications—can do all the work of obtaining your visa for you; however, there’s always an additional cost (often more than $50 per visa).

Most visas limit you to a single trip—basically during the actual dates of your planned vacation. Other visas allow you to visit as many times as you wish for a specific period of time. Remember that requirements change, sometimes at the drop of a hat, and the burden is on you to make sure that you have the appropriate visas. Otherwise, you’ll be turned away at the airport or, worse, deported after you arrive in the country. No company or travel insurer gives refunds if your travel plans are disrupted because you didn’t have the correct visa.

U.S. Passport Information

U.S. Department of State (877/487-2778. travel.state.gov/passport.)

U.S. Passport and Visa Expediters

A. Briggs Passport & Visa Expeditors (800/806-0581 or 202/388-0111. www.abriggs.com.)

American Passport Express (800/455-5166. www.americanpassport.com.)

Passport Express (800/362-8196. www.passportexpress.com.)

Travel Document Systems (800/874-5100 or 202/638-3800. www.traveldocs.com.)

Travel the World Visas (866/886-8472. www.world-visa.com.)