Cheap flights from Chicago O'Hare Intl Airport to the United Kingdom from £183

The cheapest month to fly to United Kingdom from Chicago O'Hare Intl Airport is in February. Flight prices, which tend to average around £444, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of February, then departing from Chicago O'Hare Intl Airport during the month October is also very affordable. Most momondo users find prices during this month for around £480.

The cheapest day to depart from Chicago O'Hare Intl Airport to United Kingdom is on a Sunday. Travellers who choose to depart for United Kingdom on a Sunday will often find tickets for as low as £511. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Chicago O'Hare Intl Airport to United Kingdom for around £674.

The cheapest time of day to fly to United Kingdom is in the evening when flights can be purchased for as low as £571. Try not to purchase tickets in the afternoon because they tend to be around £625. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to United Kingdom from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £588 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Chicago O'Hare Intl Airport for as low as £533 on momondo.

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

Icelandair, Aer Lingus, and British Airways are the most popular carriers operating from Chicago O'Hare Intl to United Kingdom

British Airways, Aer Lingus and Iberia are the top three most popular airlines that fly to United Kingdom from Chicago O'Hare Intl Airport according to our data. British Airways is the first choice among our users, with 56% of people opting to fly with this airline when travelling to United Kingdom. Keep in mind that there are 8 different airlines that fly to United Kingdom on a routine basis, so you have a few additional options to choose from.

Historically, on average around 26% of flights between Chicago and United Kingdom have experienced a delay on any given week. The average delay length over the past 12 months has been 170 minutes.

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

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

According to our data, American Airlines have had the fewest delays on this route over the last 12 months, with about 25% of their flights experiencing any sort of delay.

As of March 2026, 30 flights take off from Chicago O'Hare Intl Airport and land in United Kingdom each day. The most common flight departure time for this route is 18:00, with 86% of daily flights taking off in the evening.

As of March 2026, 212 flights take off from Chicago O'Hare Intl Airport and land in United Kingdom each week. The most common flight departure day for this route is Mon, with 21% of weekly flights taking off on this day.