Finnair flights from London to Chicago (LON - CHI)
Cheapflights users flying from London to Chicago on Finnair typically fly into Chicago O'Hare Intl and depart from London Heathrow. Select your dates above for pricing.
Finnair flights from London to Chicago in 2025
Find detailed information about Finnair flights from London to Chicago. Explore the options provided by Finnair to plan your journey from London to Chicago. Data last updated 30 April 2025.
Find Finnair flight deals from London to Chicago
Cheapest Finnair flights from London to ChicagoExplore the most affordable Finnair flight options available from London to Chicago. Find the lowest fares with prices last updated on 30 April 2025.
Explore the most affordable Finnair flight options available from London to Chicago. Find the lowest fares with prices last updated on 30 April 2025.
Travel insights for Finnair flights from London to Chicago
Get recent, data-driven insights about Finnair flights from London to Chicago including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from London to Chicago with Finnair?
Use this chart to determine the optimal time to book a return flight from London to Chicago. Price data was last updated on 25 April 2025.
Booking with Finnair 80 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Chicago. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from London to Chicago with Finnair?
Currently, the most affordable month to book a Finnair flight from London to Chicago in April, with an average price of £406. Conversely, traveling with Finnair from London to Chicago in July will be the most expensive, with an average cost of £505. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
Weekly Finnair flight availability from London to Chicago
The most Finnair flights from LON to CHI are scheduled on a Monday (5 on average). You will have fewer Finnair flight options on Thursday, which is when the least amount of flights are scheduled (4 on average).
Rainfall in Chicago by month
Plan your trip to Chicago by taking into account the average rainfall totals by month.
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.
Temperature in Chicago by month
Plan your trip to Chicago by taking into account the average temperature totals by month.
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).
Best time to book a flight from London to Chicago
Have a flexible travel schedule? Discover the best time to fly to Chicago from London with our price prediction graph.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Fly from London to Chicago on another airline
Consider alternative airlines that service the Chicago area. Flight routes are based on user searches made on Cheapflights and were last updated on 30 April 2025.
See what others are saying about Finnair
Read reviews and see what other travellers are saying about their experiences with Finnair. Get insights from real passengers regarding the airline's services, customer satisfaction, and overall travel experience. Use these reviews to inform your decision when choosing Finnair for your next flight. Reviews last updated 30 April 2025.
Overview
Food
Comfort
Crew
Entertainment
Boarding