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).

£381+ 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 2026

One-way from	£381
Return from	£540
Popular in	July
Cheapest in	September
Average price (all airlines)	£635

Finnair
9/9
Nonstop
8h 50m total
London to Chicago

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Finnair
1/9-15/9
Nonstop
16h 40m total
London to Chicago

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Highest demand for flights from London Heathrow to Chicago O'Hare Intl; 9% 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 £675?
London Heathrow Airport to Chicago O'Hare Intl Airport flights on Finnair are currently available under £675. 11 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.

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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 23 March 2026.

Mon 20/410:20

LHR

ORD

1 stop13h 30m

Finnair

Mon 4/522:30

ORD

LHR

Nonstop7h 45m

Finnair

Deal found 18/3£549

Wed 22/411:00

LHR

ORD

1 stop16h 00m

Finnair

Sun 26/422:20

ORD

LHR

2 stops26h 05m

Finnair

Deal found 18/3£559

Mon 27/412:15

LHR

ORD

Nonstop8h 40m

Finnair

Sun 10/520:57

ORD

LHR

1 stop31h 08m

Finnair

Deal found 18/3£567

Airlines

Weekly Finnair flight availability from London Heathrow Airport to Chicago O'Hare Intl Airport

The most Finnair flights from LHR to ORD are scheduled on a Monday (4 on average). You will have fewer Finnair flight options on Friday, which is when the least amount of flights are scheduled (3 on average).

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.

LHR-ORD

Estimated return price

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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 2026

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 23 March 2026.

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Can I get a flight from London Heathrow Airport to Chicago O'Hare Intl Airport on Finnair for under £675?

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 23 March 2026.

Explore the most affordable Finnair flight options available from Heathrow to O'Hare Intl. Find the lowest fares with prices last updated on 23 March 2026.

Best Finnair flights from Heathrow to O'Hare IntlDiscover 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 23 March 2026.

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 23 March 2026.

Direct Finnair flights from Heathrow to O'Hare IntlExplore 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 23 March 2026.

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 23 March 2026.

Last-minute Finnair flights from Heathrow to O'Hare IntlDiscover last-minute Finnair flight deals from Heathrow to O'Hare Intl. Data last updated 23 March 2026 and is based on user searches.

Discover last-minute Finnair flight deals from Heathrow to O'Hare Intl. Data last updated 23 March 2026 and is based on user searches.

One-way Finnair flights to O'Hare IntlSearch for one-way Finnair flight options to O'Hare Intl. Find affordable one-way fares based on user searches. Data last updated 23 March 2026.

Search for one-way Finnair flight options to O'Hare Intl. Find affordable one-way fares based on user searches. Data last updated 23 March 2026.

Weekly Finnair flight availability from London Heathrow Airport to Chicago O'Hare Intl Airport

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.

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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 23 March 2026.

Complete your trip

Complete your trip to O'Hare Intl by adding a car hire and/or hotel booking to your travel itinerary.

Other airlines servicing Heathrow and O'Hare Intl

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Other popular destinations in North America

If O'Hare Intl is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on 23 March 2026.

Popular flights with Finnair

Browse through some of the most popular routes that Finnair offers at this time. Flights are based on user searches made on Cheapflights and were last updated on 23 March 2026.

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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 23 March 2026.

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 23 March 2026.

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 23 March 2026.

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 23 March 2026 and is based on user searches.

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 23 March 2026.