Cheap flights from London to Chicago from $499

The month of September is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from London averaging around $714.

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Thursday when prices can be found for as low as $907. This is often the case because there is less demand to fly during this day of the week. On the other hand, Saturday is the most expensive day to depart from London because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,112.

Flying to Chicago O'Hare Intl Airport from London at noon is the least expensive time of day to depart. momondo users have found prices as low as $915 when looking at flights departing at noon. Try not to purchase tickets in the morning because they tend to be around $964. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from London Heathrow to Chicago O'Hare Intl for the best London - Chicago O'Hare Intl flight prices

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $852 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from London for as low as $790 on momondo.

There are 4 cabin classes available to choose from on London to Chicago O'Hare Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 15% on your flight if you consider stops on a London to Chicago O'Hare Intl Airport flight.

As of August 2026, prices for London to Chicago O'Hare Intl Airport flights are approximately 3% more expensive when compared to flights at the same time last year.

Icelandair, SWISS, and United Airlines are the most popular carriers operating from London to Chicago O'Hare Intl

British Airways, Lufthansa and American Airlines are the top three most popular airlines that fly to Chicago O'Hare Intl Airport from London according to our data. British Airways is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Chicago O'Hare Intl Airport. Keep in mind that there are 8 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 11% of flights between London and Chicago have experienced a delay on any given week. The average delay length over the past 12 months has been 182 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Tuesday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 6% of their flights experiencing any sort of delay.

Reykjavik (KEF) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $804.

Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 11h 38m.

Reykjavik (KEF) has the shortest average layover time for this route: 1h 15m.

49 flights are operational daily from London to Chicago O'Hare Intl Airport as of August 2026. The most popular departure time for this route is 11:00AM, with 50% of flights per day taking off at noon.

As of August 2026, 343 flights take off from London and land in Chicago O'Hare Intl Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.