Cheap flights from London Heathrow Airport to Chicago from €498

The cheapest month to fly to Chicago from London Heathrow Airport is in February. Flight prices, which tend to average around €599, are often lower during this time because this is during the off-season. If you don’t want to visit Chicago in February, then you should wait until January to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of €674.

At midday is the cheapest time of day to fly from London Heathrow Airport to Chicago when you can find flight prices for as low as €792. Flying to Chicago at midday is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are €1,099 on average. Flights to Chicago from London Heathrow Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to Chicago from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around €807 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from London Heathrow Airport for as low as €722 on momondo.

There is only 1 cabin class available to choose from on London Heathrow Airport to Chicago 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 10% on your flight if you consider stops on a London Heathrow Airport to Chicago flight.

Historically, on average around 8% 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 179 minutes.

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

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

According to our data, United Airlines have had the fewest delays on this route over the last 12 months, with about 5% of their flights experiencing any sort of delay.

As of November 2026, there are 33 flights per day flying from London Heathrow Airport to Chicago. The most common time of day flights depart is 10:00, with 58% of flights taking off in the afternoon.

As of November 2026, there are 237 flights per week flying from London Heathrow Airport to Chicago. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.