Cheap flights from London Heathrow Airport to Chicago from €402

The cheapest month to fly to Chicago from London Heathrow Airport is in February. Flight prices, which tend to average around €556, 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 €630.

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 €756 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 €694 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.

Historically, on average around 10% 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 181 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. 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 6% of their flights experiencing any sort of delay.

As of September 2026, there are 37 flights per day flying from London Heathrow Airport to Chicago. The most common time of day flights depart is 11:00, with 51% of flights taking off in the afternoon.

As of September 2026, there are 265 flights per week flying from London Heathrow Airport to Chicago. The most common day of the week flights depart is Mon, with 18% of flights taking off on this day.