Cheap flights from London Heathrow Airport to Chicago from €448

The cheapest month to fly to Chicago from London Heathrow Airport is in February. Flight prices, which tend to average around €319, 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 €340.

On average, the least expensive day to fly to Chicago from London Heathrow Airport is on a Friday. momondo users have found tickets for Friday departures for as low as €1,048. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to Chicago on Tuesday is €3,188.

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 €755. 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 morning when prices are €1,612 on average. Flights to Chicago from London Heathrow Airport in the morning 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 €655 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 €513 on momondo.

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 177 minutes.

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

Wednesday is statistically the day of the week that experiences the fewest 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 fewest delays on this route over the last 12 months, with about 5% of their flights experiencing any sort of delay.

As of May 2026, there are 49 flights per day flying from London Heathrow Airport to Chicago. The most common time of day flights depart is 11:00, with 52% of flights taking off in the afternoon.

As of May 2026, there are 348 flights per week flying from London Heathrow Airport to Chicago. The most common day of the week flights depart is Wed, with 15% of flights taking off on this day.