You'll have to either: Apply for a standard Visitor Visa. There is a cost for this, and it must be applied for three months before travel. Be able to visit Britain and Northern Ireland for six months without needing a visa.
People Also Ask
If you are from the US, an EU Member State, or certain Commonwealth countries, you do not need a visa for the UK for up to six months.
Citizens Need A Visa To Travel To The UK. 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.
U.S. citizens with valid passports traveling for tourism or business can enter France without a visa for a period of 90 days within each six-month period.
Your identity document (for example your passport or identity card) will be checked when you arrive at a UK port or airport to make sure you're allowed to come into the country. It should be valid for the whole of your stay. You may also need a visa to come into or travel through the UK, depending on your nationality.
Personal travel of 30 days or less: A U.S. citizen with a regular passport may obtain a no fee visitor visa upon arrival. Stays longer than 30 days: Visitors on a 30-day visa may request a visa extension, which is at the discretion of immigration officials.
The UK Electronic Travel Authorization is a new visa waiver for non-visa nationals. Although Americans do not need to apply for the ETA yet, they will need to in the coming years.
You must have a valid passport to enter the UK. It should be valid for the whole of your stay. You may also need a visa, depending on which country you're from. Check if you need a visa to come to the UK.
Even for a destination as safe and welcoming as the United Kingdom you may find yourself wondering, “Is it safe to travel to London?” Thankfully, the answer is that London is at least as safe for tourists as any other major city in the world, and safer than many.