Currently, the most affordable month to book a Finnair flight from London Heathrow Airport to Chicago in February, with an average price of £399. Conversely, traveling with Finnair from London Heathrow Airport to Chicago in January will be the most expensive, with an average cost of £497. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
The most Finnair flights from LHR to CHI are scheduled on a Monday (4 on average). You will have fewer Finnair flight options on Monday, which is when the least amount of flights are scheduled (4 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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