Can I get a flight from London Heathrow Airport to Chicago on Finnair for under £800?

Cheapflights currently has 11 LHR-CHI flights for under £800. Flights to Chicago will vary based on many factors, like date and time. Click here to find the best price for your dates on Cheapflights.

£411+ Finnair Flights from Heathrow to Chicago

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 Chicago in 2025

One-way from	£411
Return from	£482
Popular in	July
Cheapest in	February
Average price (all airlines)	£567

Finnair
15/12
Nonstop
8h 50m total
London to Chicago

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Finnair
2/3-10/3
1 total stop
21h 20m total
London to Chicago

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Highest demand for flights from London Heathrow to Chicago; 11% potential price increase.

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

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

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Can I get a flight from London Heathrow Airport to Chicago on Finnair for under £800?
Cheapflights currently has 11 LHR-CHI flights for under £800. Flights to Chicago will vary based on many factors, like date and time. Click here to find the best price for your dates on Cheapflights.

Find Finnair flight deals from Heathrow to Chicago

Enter your travel dates to find the best prices.

Cheapest Finnair flights from Heathrow to Chicago
Explore the most affordable Finnair flight options available from Heathrow to Chicago. Find the lowest fares with prices last updated on 10 October 2025.

Mon 10/1114:10LHR - ORD

Nonstop8h 50mFinnair

Sun 23/1120:08ORD - LHR

1 stop28h 52mFinnair

Deal found 9/10£510

Thu 6/1114:10LHR - ORD

Nonstop8h 50mFinnair

Sun 9/1118:35ORD - LHR

1 stop30h 45mFinnair

Deal found 9/10£539

Sat 8/1115:35LHR - ORD

2 stops23h 17mFinnair

Sat 22/1120:45ORD - LHR

1 stop29h 05mFinnair

Deal found 9/10£561

Best Finnair flights from Heathrow to Chicago
Discover carefully curated Finnair flight deals from Heathrow to Chicago that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 10 October 2025.

Mon 10/1114:10LHR - ORD

Nonstop8h 50mFinnair

Sun 23/1120:08ORD - LHR

1 stop28h 52mFinnair

Deal found 9/10£510

Thu 6/1114:10LHR - ORD

Nonstop8h 50mFinnair

Sun 9/1118:35ORD - LHR

1 stop30h 45mFinnair

Deal found 9/10£539

Sat 8/1115:35LHR - ORD

2 stops23h 17mFinnair

Sat 22/1111:40ORD - LHR

2 stops13h 20mFinnair

Deal found 9/10£561

Direct Finnair flights from Heathrow to Chicago
Explore direct Finnair flight options from Heathrow to Chicago based on user searches, and compare prices and availability for your desired travel dates. Data last updated 10 October 2025.

Tue 21/1009:15LHR - ORD

Nonstop8h 35mFinnair

Wed 12/1120:40ORD - LHR

Nonstop7h 45mFinnair

Deal found 8/10£637

Sun 30/1115:45LHR - ORD

Nonstop9h 00mFinnair

Mon 1/1221:45ORD - LHR

Nonstop7h 50mFinnair

Deal found 9/10£1,294

Tue 23/1214:10LHR - ORD

Nonstop8h 50mFinnair

Sun 4/118:30ORD - LHR

Nonstop7h 45mFinnair

Deal found 9/10£1,587

Last-minute Finnair flights from Heathrow to Chicago
Discover last-minute Finnair flight deals from Heathrow to Chicago. Data last updated 10 October 2025 and is based on user searches.

Mon 10/1114:10LHR - ORD

Nonstop8h 50mFinnair

Sun 23/1120:08ORD - LHR

1 stop28h 52mFinnair

Deal found 9/10£510

Thu 6/1114:10LHR - ORD

Nonstop8h 50mFinnair

Sun 9/1118:35ORD - LHR

1 stop30h 45mFinnair

Deal found 9/10£539

Sat 8/1115:35LHR - ORD

2 stops23h 17mFinnair

Sat 22/1120:45ORD - LHR

1 stop29h 05mFinnair

Deal found 9/10£561

Travel insights for Finnair flights from Heathrow to Chicago

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

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

Booking with Finnair 84 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.

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

Currently, the most affordable month to book a Finnair flight from London Heathrow Airport to Chicago in April, with an average price of £377. Conversely, traveling with Finnair from London Heathrow Airport to Chicago in December will be the most expensive, with an average cost of £486. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Weekly Finnair flight availability from London Heathrow Airport to Chicago

The most Finnair flights from LHR to CHI are scheduled on a Monday (5 on average). You will have fewer Finnair flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Chicago 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

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 Heathrow to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago 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.

Browse thousands of different options on Cheapflights for your next trip

See what others are saying about Finnair

Finnair

7.6

Good

1,332 reviews

Check prices

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 444

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Finnair flights from London Heathrow Airport to Chicago (LHR - 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 Heathrow to Chicago in 2025

Find detailed information about Finnair flights from Heathrow to Chicago. Explore the options provided by Finnair to plan your journey from Heathrow to Chicago. Data last updated 10 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 on Finnair for under £800?

Find Finnair flight deals from Heathrow to Chicago

Cheapest Finnair flights from Heathrow to ChicagoExplore the most affordable Finnair flight options available from Heathrow to Chicago. Find the lowest fares with prices last updated on 10 October 2025.

Explore the most affordable Finnair flight options available from Heathrow to Chicago. Find the lowest fares with prices last updated on 10 October 2025.

Travel insights for Finnair flights from Heathrow to Chicago

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

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

Use this chart to determine the optimal time to book a return flight from Heathrow to Chicago. Price data was last updated on 10 October 2025.

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

Weekly Finnair flight availability from London Heathrow Airport to Chicago

Rainfall in Chicago by month

Plan your trip to Chicago by taking into account the average rainfall totals by month.

Temperature in Chicago by month

Plan your trip to Chicago by taking into account the average temperature totals by month.

Best time to book a flight from Heathrow to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago 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 10 October 2025.

See what others are saying about Finnair

Overview

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Travel Smart

Cheapest Finnair flights from Heathrow to Chicago
Explore the most affordable Finnair flight options available from Heathrow to Chicago. Find the lowest fares with prices last updated on 10 October 2025.