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Cheap flights from London Heathrow Airport to Illinois from £367

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
6 dic — 13 dic1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Illinois

Keep the following information in mind while searching for Heathrow to Illinois flight deals. Data was last updated 6 novembre 2025.

Round-trip from

£409

One-way from

£367

Popular in

July

Cheapest in

February

Average price

£494

Good round-trip deal

£585 or less

Good one-way deal

£462 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 23/11-30/11
  • 4 total stops
  • 33h 35m total
  • London to Illinois
Search Deals
Finnair
  • Finnair
  • 21/4
  • Nonstop
  • 9h 05m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£63 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from London Heathrow to Illinois.
Search Deals
Price to beat on a one-way flight from London Heathrow to Illinois.
Search Deals

Find flight deals from Heathrow to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Illinois
Explore the most affordable flight options available from Heathrow to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 novembre 2025.

dom 23/1106:40LHR - ORD
2 stops16h 05mScandinavian Airlines
dom 30/1119:20ORD - LHR
2 stops17h 30mScandinavian Airlines
Deal found 3/11£409
sab 22/1115:35LHR - ORD
2 stops31h 10mScandinavian Airlines
dom 23/1119:20ORD - LHR
1 stop17h 10mScandinavian Airlines
Deal found 3/11£410
dom 23/1110:20LHR - ORD
1 stop12h 25mScandinavian Airlines
sab 29/1119:20ORD - LHR
2 stops17h 30mScandinavian Airlines
Deal found 3/11£410
mer 12/1121:05LHR - ORD
2 stops25h 40mScandinavian Airlines
mer 26/1119:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 3/11£411
mar 18/1121:05LHR - ORD
2 stops25h 40mScandinavian Airlines
mer 26/1119:20ORD - LHR
1 stop16h 20mScandinavian Airlines
Deal found 3/11£413
lun 24/1106:40LHR - ORD
1 stop16h 05mScandinavian Airlines
lun 8/1219:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 4/11£413
sab 22/1106:40LHR - ORD
2 stops40h 05mScandinavian Airlines
sab 29/1119:20ORD - LHR
2 stops15h 40mScandinavian Airlines
Deal found 4/11£414
gio 20/1110:20LHR - ORD
1 stop12h 25mScandinavian Airlines
dom 23/1119:20ORD - LHR
2 stops15h 05mScandinavian Airlines
Deal found 5/11£417
ven 21/1110:20LHR - ORD
1 stop12h 25mScandinavian Airlines
sab 29/1119:20ORD - LHR
1 stop20h 20mScandinavian Airlines
Deal found 4/11£417
mer 3/1211:45LHR - MDW
2 stops18h 02mVirgin Atlantic
mer 10/1213:14MDW - LHR
2 stops12h 51mVirgin Atlantic
Deal found 5/11£521
mer 10/1208:40LHR - MDW
2 stops15h 38mDelta
mar 16/1209:34MDW - LHR
1 stop17h 11mDelta
Deal found 4/11£524
mar 25/1111:45LHR - MDW
2 stops17h 55mVirgin Atlantic
mer 3/1212:50MDW - LHR
1 stop11h 35mVirgin Atlantic
Deal found 5/11£539

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 6 novembre 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

Fly from

Heathrow

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

lun 2/3

07:05-16:45

2 stops15h 40m

Chicago O'Hare Intl

dom 8/3

20:20-18:50

2 stops17h 30m

£412

LondonChicago

LHR - ORD

LHRORD

London Heathrow

sab 7/2

15:35-16:55

2 stops31h 20m

Chicago O'Hare Intl

sab 14/2

19:20-16:25

2 stops15h 05m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

ven 20/3

07:05-17:45

2 stops15h 40m

Chicago O'Hare Intl

dom 22/3

20:20-16:25

2 stops15h 05m

£427

LondonChicago

LHR - ORD

LHRORD

London Heathrow

mar 25/11

19:50-16:45

2 stops26h 55m

Chicago O'Hare Intl

mer 11/2

19:20-18:50

2 stops17h 30m

£428

LondonChicago

LHR - ORD

LHRORD

London Heathrow

dom 16/11

06:40-16:45

2 stops16h 05m

Chicago O'Hare Intl

dom 7/12

19:20-16:25

2 stops15h 05m

£457

LondonChicago

LHR - ORD

LHRORD

London Heathrow

mer 3/12

21:05-16:45

2 stops25h 40m

Chicago O'Hare Intl

mer 10/12

07:00-09:20

2 stops20h 20m

£478

LondonChicago

LHR - ORD

LHRORD

London Heathrow

mer 21/1

08:30-15:20

1 stop12h 50m

Chicago O'Hare Intl

mer 28/1

17:50-07:55

Nonstop8h 05m

£499

LondonChicago

LHR - ORD

LHRORD

London Heathrow

mer 3/12

07:40-11:00

Nonstop9h 20m

Chicago O'Hare Intl

mer 10/12

21:05-11:15

Nonstop8h 10m

£516

LondonChicago

LHR - ORD

LHRORD

London Heathrow

gio 20/11

16:20-18:30

1 stop32h 10m

Chicago O'Hare Intl

sab 22/11

18:28-08:30

1 stop32h 02m

£522

LondonChicago

LHR - ORD

LHRORD

London Heathrow

mer 10/12

06:30-16:59

2 stops16h 29m

Chicago O'Hare Intl

mar 16/12

08:55-08:45

1 stop17h 50m

£524

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 60 results
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Best time to book a flight from Heathrow to Illinois

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

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Illinois

What is the cheapest month to book a flight from London Heathrow Airport to Illinois?

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of £367). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of £516). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to IL?

Find hourly flight availability from Heathrow to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 novembre 2025.

When flying from London Heathrow Airport to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 27% versus a flight in the afternoon.

What is the cheapest day to fly from London Heathrow Airport to Illinois?

Use this chart to determine the cheapest time to fly return from Heathrow to Illinois. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to Illinois flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London Heathrow Airport to Illinois

Explore weekly flight availability from Heathrow to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 6 novembre 2025.

The most flights from LHR to USIL are scheduled on a Wednesday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 6 novembre 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Illinois, such as Finnair, Aer Lingus, andIcelandair. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,335 reviews
Check prices

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Crew

8.1

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

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.
Finnair
7.6
Good
1,335 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Crew

8.1

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

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.
Aer Lingus
7.2
Good
1,365 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Crew

8.1

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

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.
Icelandair
7.1
Good
571 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Crew

8.1

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

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.
Lufthansa
6.8
Okay
7,555 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Crew

8.1

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

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.
British Airways
6.7
Okay
7,496 reviews
Finnair
7.6
Good
1,335 reviews
Check prices

Food

6.7

Entertainment

6.9

Overall

7.6

Boarding

7.6

Crew

8.1

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

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.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London Heathrow Airport to Illinois?

    Departing from London Heathrow Airport to Illinois will take you 14h 54m. The distance from London Heathrow Airport to Illinois is about 4186 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from London Heathrow Airport to Illinois one-way?

    One-way options have recently been found by users for as low as £367 on Finnair. Other airlines that offer cheap prices include United Airlines from £369 and Austrian Airlines from £374 one-way.

  • What are the most popular routes from London Heathrow Airport to Illinois?

    The most popular flight routes from London Heathrow Airport to Illinois are London Heathrow - Chicago O'Hare Intl, London Heathrow - Chicago Midway and London Heathrow - Lambert-St Louis.

  • What are the most reliable airlines from London Heathrow Airport to Illinois?

    Before booking your flight to Illinois from London Heathrow Airport, check out the most reliable airlines to get you to your destination on time: Air Canada (84%), Austrian Airlines (84%), United Airlines( 84%).

  • What are the cheapest flights from London Heathrow Airport to Illinois?

    Looking at all options, your cheapest flight can be booked for £373. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £385 on average, our data indicates £1,306 when flying from London Heathrow Airport to Illinois.

  • Can I find deals for flights from Heathrow to Illinois that include hotel bookings?

    Yes. In addition to deals on Heathrow to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Illinois.

  • Can I find deals for business class flights from Heathrow to Illinois?

    Yes. Cheapflights offers flight deals from Heathrow to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to Illinois?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of £367). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of £516). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Heathrow to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Heathrow to Illinois

Discover the top 10 airlines that operate flights from Heathrow to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 6 novembre 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£350Average£466FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£355Average£575FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Scandinavian AirlinesCheapest£370Average£494FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£379Average£629FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£381Average£606FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Brussels AirlinesCheapest£397Average£556FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£408Average£592FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£416Average£584FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£416Average£620FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£420Average£688FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Illinois?

Cheapflights helps you search for flights from Heathrow to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Illinois?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Heathrow to Illinois for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Heathrow to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Heathrow to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Illinois become cheaper?

Of course! You can now track prices for flights from Heathrow to Illinois and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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