Cheap flights from London to the United States from £256

The cheapet airlines for a one-way flight from London to USA are Iberia (£256), Norse Atlantic UK (£259), and A.P.G. (£262).

The most popular route from London to USA is London Heathrow - New York John F Kennedy Intl. You may also consider London Heathrow - Newark or London Gatwick - New York John F Kennedy Intl.

Consider SriLankan Airlines (94%), KLM (88%) or Air France (88%) when booking your flight. These represent the most reliable airlines when flying from London to USA.

While on average a flight from London to USA is generally £3,472, our data shows the cheapest flight currently is £375. When looking at the most popular route, (London Heathrow - New York John F Kennedy Intl), you can expect to pay £290 for that flight.

Yes. In addition to deals on London to USA flights, Cheapflights offers holiday packages that include both flights and hotel.

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to USA.

Yes. Cheapflights offers flight deals from London to USA by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Currently, January is the cheapest month in which you can book a flight from London to USA (average of £575). Flying from London to USA in July is currently the most expensive (average of £811). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

To do your part when it comes to eco-friendly air travel, we recommend booking a slightly more expensive direct ticket from the Cheapflights website. The journey will take approximately 11 hours when booking a direct flight to USA from London; you will be able to book with either Finnair or Virgin Active. Several other airlines offer one-stop flights, which will be more cost-effective but increase your carbon footprint drastically. Finnair is doing its part to reduce its carbon emissions by 50% in the next coming years. They have swapped out their fleet of crafts to the "green" aircraft - the A350, which puts out at least 25% fewer emissions.

When booking your flight keep a few things in mind to be a contributor to more sustainable travel. Firstly, make sure you are on time to catch your flight. If the pilot is forced to catch up the time he will be burning weight of extra fuel per minute. Make sure you pack light. Reducing the weight of your bag reduces your carbon footprint by 5%. Pre-book your meal directly with the airline. This will allow the airline to prepare and store only the meals needed for the flight, without having excess options that result in food waste. You can also bring your own recycled water bottle and ask for it to be refilled to avoid buying pre-bottled water on board.