Things to Know Before You Go
Flights to London range from $800 to $1,200 or more depending on time of year and the flexibility of ticket. US citizens don’t need a visa to enter the country.
The US Dollar is weaker than the British Pound — 1 pound nets you $1.58. Avoid pricey black cabs, and instead go for lower priced mini cabs, or a daily travel card that will get you unlimited service on the buses, London Underground and rails around the city and beyond.
VisitLondon.com has more info.