Find cheap Finnair flights to Illinois from £407

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Flight Deals

Cheap Finnair Flight Deals to Illinois

 
Here are some of the best deals found on KAYAK recently from Finnair to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return Finnair flight deals from the United Kingdom to Illinois

Tue, 10 Feb - Tue, 3 Mar
Finnair Logo
15:45 - 18:45LHR-ORD
9h 00mdirect
Finnair Logo
20:45 - 10:25ORD-LHR
7h 40mdirect
£508Finnair
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Wed, 10 Dec - Wed, 17 Dec
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17:00 - 08:17LHR-ORD
21h 17m2 stops
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16:52 - 09:30ORD-LHR
10h 38m1 stop
£511Finnair
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Mon, 2 Mar - Sun, 8 Mar
Finnair Logo
11:00 - 13:50LHR-ORD
8h 50mdirect
Finnair Logo
20:36 - 07:00ORD-LHR
29h 24m1 stop
£519Finnair
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Tue, 12 May - Sun, 17 May
Finnair Logo
09:45 - 21:25LHR-ORD
17h 40m2 stops
Finnair Logo
18:30 - 06:55ORD-LHR
30h 25m1 stop
£523Finnair
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Mon, 2 Mar - Sun, 8 Mar
Finnair Logo
14:10 - 17:00LHR-ORD
8h 50mdirect
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20:36 - 07:00ORD-LHR
29h 24m1 stop
£524Finnair
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Wed, 28 Jan - Wed, 25 Feb
Finnair Logo
17:00 - 09:03LHR-STL
22h 03m2 stops
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11:34 - 06:20STL-LHR
12h 46m2 stops
£539Finnair
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Fri, 1 May - Thu, 7 May
Finnair Logo
10:20 - 17:50LHR-ORD
13h 30m1 stop
Finnair Logo
21:15 - 11:15ORD-LHR
8h 00mdirect
£540Finnair
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Thu, 7 May - Tue, 12 May
Finnair Logo
10:20 - 17:50LHR-ORD
13h 30m1 stop
Finnair Logo
17:00 - 06:50ORD-LHR
7h 50mdirect
£540Finnair
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Thu, 30 Apr - Thu, 7 May
Finnair Logo
07:30 - 17:50LHR-ORD
16h 20m1 stop
Finnair Logo
17:00 - 06:55ORD-LHR
7h 55mdirect
£545Finnair
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Fri, 20 Feb - Fri, 27 Feb
Finnair Logo
14:10 - 17:00LHR-ORD
8h 50mdirect
Finnair Logo
13:18 - 06:15ORD-LHR
10h 57m1 stop
£546Finnair
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Good to know

Low seasonNovember
Cheapest flight£407
Average price round-trip£637
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly and prices are also 3% lower on average.
Flight from London Heathrow Airport to Chicago
(price for this month)

KAYAK's insights & trends for flights to Illinois

Get data-powered insights and trends for flights to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest day to fly to Illinois?

The average price of all flights from the United Kingdom to Illinois clicked on KAYAK for each day over the last 12 months.

Based on KAYAK data, the cheapest day to fly to Illinois is Wednesday when return tickets can be as cheap as £623. On the other hand, the most expensive day to fly is Saturday, when return prices are £686 on average.

What is the cheapest month to fly from the United Kingdom to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from the United Kingdom to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from the United Kingdom to Illinois is September, when tickets cost £475 (return) on average. On the other hand, the most expensive months are November and December, when the average cost of round-trip tickets is £722 and £705 respectively.

How far in advance should I book a flight from the United Kingdom to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below-average price on a flight from the United Kingdom to Illinois, you should book around 2 weeks before departure, which saves you about 21% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

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Finnair customer reviews

7.6
Good1,334 verified ratings
8.1Crew
7.4Comfort
7.6Boarding
6.9Entertainment
6.7Food
Traveller rating:
Sort by:
D
8.0 Very Good
All reviews good because...flight from BWI to London ,economy seats was miserable. I usually book 1,step up from economy but this would have added 1500 bucks 1 way. Bit the bullet and upgraded for retun flight, otherwise all ratings would have been rock bottom.
A
4.0 Mediocre
Cattle Call Boarding and rude attendants.
A
4.0 Mediocre
Economy seat but they charge as business class!!
S
10.0 Wonderful
Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly
A
2.0 Poor
Flight was cancelled, and again today
A
6.0 Okay
It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.
A
8.0 Very Good
Good with how much I paid for the flight.
S
8.0 Very Good
Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.
S
10.0 Wonderful
Very good
A
10.0 Wonderful
This was an absolutely exceptional flight. The flight attendants were extremely attentive and very friendly. They seemed to go out of their way to make us comfortable and to make sure that we had everything we needed., We were in business and were very happy with the size and the details for our pods. We would definitely recommend Finnair and will definitely be flying with them again.
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Everything you need to know for your flight to Illinois