Cheap flights from London Heathrow Airport to Chicago from $681

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 $1,055.

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 $1,282 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 $1,162 on momondo.

There are 2 cabin classes 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 3% on your flight if you consider stops on a London Heathrow Airport to Chicago flight.

As of October 2026, prices for London Heathrow Airport to Chicago flights are approximately 14% cheaper when compared to flights at the same time last year.

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 October 2026, there are 35 flights per day flying from London Heathrow Airport to Chicago. The most common time of day flights depart is 11:00, with 56% of flights taking off at midday.

The number of flights available between London Heathrow Airport and Chicago is 251 per week as of October 2026. The most frequent departure day is Wed, with 18% of weekly flights leaving on this day.