In terms of precipitation, rainfall in Chicago O'Hare Intl Airport 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 O'Hare Intl Airport when rainfall is around 43.0 mm.

If weather is an important factor for your trip to Chicago O'Hare Intl Airport, 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).

£403+ Finnair Flights from Heathrow to O'Hare Intl

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 Heathrow to O'Hare Intl in 2025

One-way from	£403
Return from	£553
Popular in	July
Cheapest in	September
Average price (all airlines)	£590

Finnair
16/4
Nonstop
8h 40m total
London to Chicago

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Finnair
17/11-1/12
Nonstop
16h 35m total
London to Chicago

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Highest demand for flights from London Heathrow to Chicago O'Hare Intl; 12% potential price increase.

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Best time to find cheap flights from London Heathrow to Chicago O'Hare Intl; 2% potential price drop.

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Average price for all London Heathrow to Chicago O'Hare Intl flights (one-way and round-trip).

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Can I get a flight from London Heathrow Airport to Chicago O'Hare Intl Airport on Finnair for under £598?
London Heathrow Airport to Chicago O'Hare Intl Airport flights on Finnair are currently available under £598. 9 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.

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Enter your travel dates to find the best prices.

Cheapest Finnair flights from Heathrow to O'Hare Intl
Explore the most affordable Finnair flight options available from Heathrow to O'Hare Intl. Find the lowest fares with prices last updated on 22 October 2025.

Mon 24/1112:35LHR - ORD

Nonstop8h 50mFinnair

Tue 2/1218:25ORD - LHR

Nonstop7h 50mFinnair

Deal found 22/10£550

Mon 17/1112:35LHR - ORD

Nonstop8h 50mFinnair

Mon 1/1220:40ORD - LHR

Nonstop7h 45mFinnair

Deal found 20/10£553

Mon 17/1114:10LHR - ORD

Nonstop8h 50mFinnair

Thu 4/1216:04ORD - LHR

1 stop11h 36mFinnair

Deal found 22/10£593

Best Finnair flights from Heathrow to O'Hare Intl
Discover carefully curated Finnair flight deals from Heathrow to O'Hare Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 22 October 2025.

Wed 26/1114:10LHR - ORD

Nonstop8h 50mFinnair

Tue 2/1218:25ORD - LHR

Nonstop7h 50mFinnair

Deal found 22/10£550

Mon 24/1112:35LHR - ORD

Nonstop8h 50mFinnair

Tue 2/1218:25ORD - LHR

Nonstop7h 50mFinnair

Deal found 22/10£550

Wed 4/315:45LHR - ORD

Nonstop9h 00mFinnair

Tue 10/319:45ORD - LHR

Nonstop7h 50mFinnair

Deal found 20/10£562

Direct Finnair flights from Heathrow to O'Hare Intl
Explore direct Finnair flight options from Heathrow to O'Hare Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 22 October 2025.

Mon 24/1112:35LHR - ORD

Nonstop8h 50mFinnair

Tue 2/1218:25ORD - LHR

Nonstop7h 50mFinnair

Deal found 22/10£550

Mon 17/1112:35LHR - ORD

Nonstop8h 50mFinnair

Mon 1/1220:40ORD - LHR

Nonstop7h 45mFinnair

Deal found 20/10£553

Tue 3/311:00LHR - ORD

Nonstop8h 50mFinnair

Tue 10/321:45ORD - LHR

Nonstop7h 40mFinnair

Deal found 20/10£562

Last-minute Finnair flights from Heathrow to O'Hare Intl
Discover last-minute Finnair flight deals from Heathrow to O'Hare Intl. Data last updated 22 October 2025 and is based on user searches.

Mon 24/1112:35LHR - ORD

Nonstop8h 50mFinnair

Tue 2/1218:25ORD - LHR

Nonstop7h 50mFinnair

Deal found 22/10£550

Mon 17/1112:35LHR - ORD

Nonstop8h 50mFinnair

Mon 1/1220:40ORD - LHR

Nonstop7h 45mFinnair

Deal found 20/10£553

Mon 17/1114:10LHR - ORD

Nonstop8h 50mFinnair

Thu 4/1216:04ORD - LHR

1 stop11h 36mFinnair

Deal found 22/10£593

One-way Finnair flights to O'Hare Intl
Search for one-way Finnair flight options to O'Hare Intl. Find affordable one-way fares based on user searches. Data last updated 22 October 2025.

Thu 16/409:15LHR - ORD

Nonstop8h 40mFinnair

Deal found 20/10£403

Mon 15/1212:35LHR - ORD

Nonstop8h 50mFinnair

Deal found 20/10£409

Wed 25/312:35LHR - ORD

Nonstop8h 50mFinnair

Deal found 20/10£412

Travel insights for Finnair flights from Heathrow to O'Hare Intl

Get recent, data-driven insights about Finnair flights from Heathrow to O'Hare Intl including ideal travel times, pricing trends, and more.

Prices

How far ahead should I book a flight from London Heathrow Airport to Chicago O'Hare Intl Airport with Finnair?

Booking with Finnair 15 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Chicago O'Hare Intl Airport. 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 Heathrow Airport to Chicago O'Hare Intl Airport with Finnair?

Currently, the most affordable month to book a Finnair flight from London Heathrow Airport to Chicago O'Hare Intl Airport in April, with an average price of £375. Conversely, traveling with Finnair from London Heathrow Airport to Chicago O'Hare Intl Airport in December will be the most expensive, with an average cost of £483. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Best time to book a flight from Heathrow to O'Hare Intl

Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from Heathrow with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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See what others are saying about Finnair

Finnair

7.6

Good

1,333 reviews

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Overview

Recent reviews

4.0

Mediocre|Sept 2025

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.

8.0

Very Good|Jul 2025

It was okay

2.0

Poor|Jun 2025

They stranded us in the airport

10.0

Wonderful|May 2025

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

10.0

Wonderful|May 2025

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.

1 out of 445

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Finnair flights from London Heathrow Airport to Chicago O'Hare Intl Airport (LHR - ORD)

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 Heathrow to O'Hare Intl in 2025

Find detailed information about Finnair flights from Heathrow to O'Hare Intl. Explore the options provided by Finnair to plan your journey from Heathrow to O'Hare Intl. Data last updated 22 October 2025.

One-way from

Return from

Popular in

Cheapest in

Average price (all airlines)

Can I get a flight from London Heathrow Airport to Chicago O'Hare Intl Airport on Finnair for under £598?

Find Finnair flight deals from Heathrow to O'Hare Intl

Cheapest Finnair flights from Heathrow to O'Hare IntlExplore the most affordable Finnair flight options available from Heathrow to O'Hare Intl. Find the lowest fares with prices last updated on 22 October 2025.

Explore the most affordable Finnair flight options available from Heathrow to O'Hare Intl. Find the lowest fares with prices last updated on 22 October 2025.

Travel insights for Finnair flights from Heathrow to O'Hare Intl

Get recent, data-driven insights about Finnair flights from Heathrow to O'Hare Intl including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from London Heathrow Airport to Chicago O'Hare Intl Airport with Finnair?

What is the cheapest month to book a flight from London Heathrow Airport to Chicago O'Hare Intl Airport with Finnair?

Rainfall in O'Hare Intl by month

Temperature in O'Hare Intl by month

Best time to book a flight from Heathrow to O'Hare Intl

Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from Heathrow 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.

Other Finnair flights from Heathrow

Browse through other Finnair flights departing from Heathrow. Flight routes are based on user searches made on Cheapflights and were last updated on 22 October 2025.

See what others are saying about Finnair

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Cheapest Finnair flights from Heathrow to O'Hare Intl
Explore the most affordable Finnair flight options available from Heathrow to O'Hare Intl. Find the lowest fares with prices last updated on 22 October 2025.