Visitors to the UK now need an electronic travel authorization to travel from the United States. Make sure to get one before you fly across the pond for your fish and chips with mushy peas.
Before flying to the United Kingdom from the United States, make sure you have an electronic travel authorization.
You can apply online or using an app on your phone and it only takes a few minutes.
Here's a step-by-step guide I wrote for NerdWallet.