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Booking with British Airways 22 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Chicago. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, the most affordable month to book a British Airways flight from London Heathrow Airport to Chicago in September, with an average price of £371. Conversely, traveling with British Airways from London Heathrow Airport to Chicago in July will be the most expensive, with an average cost of £503. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
The most British Airways flights from LHR to CHI are scheduled on a Monday (6 on average). You will have fewer British Airways flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).
In terms of precipitation, rainfall in Chicago ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Chicago when rainfall is around 43.0 mm.
If weather is an important factor for your trip to Chicago, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).
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