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

Departing from London Heathrow Airport to Illinois will take you 11h 05m. The distance from London Heathrow Airport to Illinois is about 3939 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 £400 on Delta. Other airlines that offer cheap prices include Virgin Atlantic from £405 and Brussels Airlines from £407 one-way.

In terms of precipitation, rainfall in Illinois 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 Illinois when rainfall is around 43.0 mm.

If weather is an important factor for your trip to Illinois, 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).

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 cheapest flights from London Heathrow Airport to Illinois?

Looking at all options, your cheapest flight can be booked for £410. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £330 on average, our data indicates £802 when flying from London Heathrow Airport to Illinois.

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 (75%), Austrian Airlines (75%), United Airlines( 75%).

What are the most popular airlines that fly from London Heathrow Airport to Illinois?

When booking a flight from London Heathrow Airport to Illinois, you may want to consider flying on American Airlines, Finnair or British Airways as they are the most popular for this route.

How far in advance should I book a flight from London Heathrow Airport to Illinois?

To save up to 35% on this flight, we recommend booking at least 56 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from London Heathrow Airport to Illinois from £488 1-2 weeks out and tickets from £658 for flights departing within the next 72 hours.

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

February can be a great time to fly to Illinois from London Heathrow Airport with a flight ticket averaging about £509. Cheapflights users have found deals in the month of February for as cheap as £312. The most expensive prices can be found in the month of July.

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.

£347+ Cheap Flights from London Heathrow Airport to Illinois

Cheap flight deals from Heathrow to Illinois

Round-trip from	£394
Popular in	July
Cheapest in	February
Average price	£436
Good round-trip deal	£494 or less
Good one-way deal	£491 or less

British Airways
1/10-6/10
1 total stop
19h 35m total
London to Illinois

Search Deals

Highest demand for flights based on searches. 14% potential increase in price (£61 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 September 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

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 15 September 2025.

Wed 1/1009:50LHR - ORD

1 stop11h 55mBritish Airways

Mon 6/1017:40ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 15/9£394

Fri 3/1007:40LHR - ORD

1 stop14h 05mAmerican Airlines

Fri 10/1013:43ORD - LHR

1 stop10h 37mAmerican Airlines

Deal found 14/9£394

Fri 19/906:50LHR - ORD

1 stop11h 15mMultiple Airlines

Mon 22/921:50ORD - LHR

Nonstop7h 55mMultiple Airlines

Deal found 12/9£395

Mon 8/1219:50LHR - ORD

2 stops50h 55mScandinavian Airlines

Sat 10/119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 14/9£396

Thu 9/1007:45LHR - ORD

2 stops14h 50mUnited Airlines

Tue 14/1014:39ORD - LHR

1 stop10h 16mUnited Airlines

Deal found 15/9£397

Thu 6/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Wed 12/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/9£397

Sun 14/1212:15LHR - ORD

1 stop11h 05mIcelandair

Thu 15/118:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 15/9£398

Fri 7/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Mon 10/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£399

Tue 23/909:15LHR - ORD

Nonstop8h 35mBritish Airways

Sun 5/1022:35ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 15/9£400

Mon 24/1115:45LHR - ORD

Nonstop9h 00mBritish Airways

Sun 30/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 15/9£400

Thu 9/1007:45LHR - ORD

2 stops14h 50mUnited Airlines

Mon 13/1018:00ORD - LHR

1 stop15h 40mUnited Airlines

Deal found 15/9£401

Thu 25/913:05LHR - MDW

1 stop14h 31mVirgin Atlantic

Sun 28/912:43MDW - LHR

1 stop12h 32mVirgin Atlantic

Deal found 13/9£401

Best flights from Heathrow to Illinois
Discover carefully curated flight deals from Heathrow to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 September 2025.

Tue 9/1207:05LHR - ORD

2 stops39h 40mScandinavian Airlines

Fri 9/119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 14/9£396

Wed 1/1007:45LHR - ORD

2 stops14h 50mUnited Airlines

Sun 12/1014:08ORD - LHR

1 stop13h 27mUnited Airlines

Deal found 14/9£397

Mon 15/1212:15LHR - ORD

1 stop11h 05mIcelandair

Thu 15/118:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 15/9£398

Fri 26/906:50LHR - ORD

1 stop11h 15mMultiple Airlines

Sun 28/921:25ORD - LHR

Nonstop8h 20mMultiple Airlines

Deal found 15/9£403

Thu 30/1013:35LHR - ORD

Nonstop9h 25mAustrian Airlines

Thu 6/1117:50ORD - LHR

Nonstop8h 05mAustrian Airlines

Deal found 15/9£414

Thu 9/1009:15LHR - ORD

1 stop14h 21mBritish Airways

Mon 13/1016:52ORD - LHR

1 stop11h 28mBritish Airways

Deal found 14/9£418

Fri 3/1008:40LHR - ORD

2 stops15h 24mDelta

Tue 7/1018:20ORD - LHR

1 stop10h 40mDelta

Deal found 14/9£422

Fri 14/1106:30LHR - MDW

2 stops17h 48mVirgin Atlantic

Sat 22/1113:47MDW - LHR

1 stop11h 18mVirgin Atlantic

Deal found 13/9£422

Wed 3/1206:30LHR - STL

1 stop13h 25mLufthansa

Thu 15/113:15STL - LHR

1 stop10h 40mLufthansa

Deal found 13/9£630

Sat 22/1106:15LHR - SPI

2 stops17h 33mAmerican Airlines

Tue 25/1118:18SPI - LHR

2 stops32h 12mAmerican Airlines

Deal found 12/9£643

Sat 13/1220:35LHR - ORD

1 stop26h 45mIcelandair

Thu 8/118:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 14/9£400

Sat 27/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Mon 6/1018:00ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 14/9£413

Direct flights from Heathrow to Illinois
Explore direct flight options from Heathrow to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 15 September 2025.

Wed 29/1010:25LHR - ORD

Nonstop9h 20mLufthansa

Wed 5/1117:50ORD - LHR

Nonstop8h 05mLufthansa

Deal found 14/9£396

Thu 6/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Wed 12/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/9£397

Fri 3/1012:15LHR - ORD

Nonstop8h 35mBritish Airways

Mon 6/1020:40ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£398

Fri 7/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Mon 10/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£399

Sat 1/1112:35LHR - ORD

Nonstop8h 40mBritish Airways

Fri 14/1117:10ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 15/9£400

Mon 24/1115:45LHR - ORD

Nonstop9h 00mBritish Airways

Sun 30/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 15/9£400

Mon 6/1008:30LHR - ORD

Nonstop9h 00mAustrian Airlines

Sun 12/1021:25ORD - LHR

Nonstop8h 20mAustrian Airlines

Deal found 13/9£407

Thu 30/1007:40LHR - ORD

Nonstop9h 20mUnited Airlines

Thu 6/1115:45ORD - LHR

Nonstop8h 10mUnited Airlines

Deal found 15/9£408

Wed 19/1111:00LHR - ORD

Nonstop8h 50mBritish Airways

Sun 23/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£409

Sat 27/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Sat 4/1021:25ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 15/9£413

Fri 6/210:25LHR - ORD

Nonstop9h 20mUnited Airlines

Fri 20/215:45ORD - LHR

Nonstop8h 10mUnited Airlines

Deal found 15/9£414

Sun 9/1114:10LHR - ORD

Nonstop8h 50mBritish Airways

Thu 13/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/9£414

Last-minute flights from Heathrow to Illinois
Discover last-minute flight deals from Heathrow to Illinois. Data last updated 15 September 2025 and is based on user searches.

Sat 20/906:00LHR - ORD

1 stop12h 55mMultiple Airlines

Wed 24/916:00ORD - LHR

Nonstop8h 20mMultiple Airlines

Deal found 14/9£396

Sat 20/906:00LHR - ORD

1 stop12h 55mMultiple Airlines

Thu 25/914:53ORD - LHR

1 stop12h 47mMultiple Airlines

Deal found 14/9£397

Sat 20/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Sun 21/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Deal found 12/9£403

Sat 20/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Fri 3/1018:00ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 13/9£403

Mon 22/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Mon 29/920:40ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£398

Tue 23/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Fri 3/1022:35ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 13/9£397

Tue 23/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Sun 5/1017:40ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 14/9£399

Tue 23/914:10LHR - ORD

Nonstop8h 35mBrussels Airlines

Tue 30/916:00ORD - LHR

Nonstop8h 20mBrussels Airlines

Deal found 15/9£400

Tue 23/907:30LHR - ORD

2 stops16h 51mLufthansa

Tue 30/922:30ORD - LHR

1 stop12h 10mLufthansa

Deal found 15/9£402

Tue 23/909:45LHR - ORD

2 stops17h 38mFinnair

Sun 5/1007:00ORD - LHR

1 stop19h 05mFinnair

Deal found 14/9£405

Thu 25/914:10LHR - ORD

2 stops22h 41mFinnair

Mon 29/913:59ORD - LHR

1 stop11h 46mFinnair

Deal found 13/9£405

Wed 29/1010:45LHR - MDW

1 stop16h 29mVirgin Atlantic

Wed 5/1113:48MDW - LHR

1 stop11h 17mVirgin Atlantic

Deal found 14/9£405

One-way flights from Heathrow to Illinois
Search for one-way flight options from Heathrow to Illinois. Find affordable one-way fares based on user searches. Data last updated 15 September 2025.

Mon 27/1020:05LHR - ORD

2 stops48h 55mMultiple Airlines

Deal found 15/9£400

Thu 15/109:50LHR - MDW

3 stops38h 18mMultiple Airlines

Deal found 14/9£400

Thu 30/1006:00LHR - STL

3 stops43h 12mMultiple Airlines

Deal found 13/9£400

Tue 7/1013:25LHR - ORD

2 stops29h 20mMultiple Airlines

Deal found 15/9£400

Fri 13/213:00LHR - MDW

1 stop11h 34mDelta

Deal found 15/9£400

Thu 30/1019:55LHR - MDW

3 stops45h 42mMultiple Airlines

Deal found 15/9£402

Fri 31/1012:25LHR - ORD

2 stops24h 53mMultiple Airlines

Deal found 13/9£403

Sun 21/915:05LHR - ORD

3 stops31h 35mMultiple Airlines

Deal found 14/9£404

Fri 12/1219:30LHR - ORD

1 stop27h 15mScandinavian Airlines

Deal found 13/9£405

Fri 3/1006:00LHR - ORD

1 stop16h 30mTAP AIR PORTUGAL

Deal found 13/9£405

Fri 3/1008:30LHR - ORD

Nonstop9h 00mBrussels Airlines

Deal found 14/9£407

Sun 30/1121:00LHR - ORD

2 stops23h 00mBritish Airways

Deal found 13/9£408

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/12

07:05-16:45

2 stops39h 40m

Chicago O'Hare Intl

Fri 9/1

19:20-16:00

1 stop14h 40m

£396

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 1/10

07:45-16:35

2 stops14h 50m

Chicago O'Hare Intl

Sun 12/10

14:08-09:35

1 stop13h 27m

£397

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 15/12

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Thu 15/1

18:30-19:30

1 stop19h 00m

£398

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 13/12

20:35-17:20

1 stop26h 45m

Chicago O'Hare Intl

Thu 8/1

18:30-19:30

1 stop19h 00m

£400

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 26/9

06:50-12:05

1 stop11h 15m

Chicago O'Hare Intl

Sun 28/9

21:25-11:45

Nonstop8h 20m

£403

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 27/9

08:30-11:30

Nonstop9h 00m

Chicago O'Hare Intl

Mon 6/10

18:00-08:20

Nonstop8h 20m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 30/10

13:35-18:00

Nonstop9h 25m

Chicago O'Hare Intl

Thu 6/11

17:50-07:55

Nonstop8h 05m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/2

13:35-17:00

Nonstop9h 25m

Chicago O'Hare Intl

Tue 24/2

21:05-11:15

Nonstop8h 10m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/10

09:15-17:36

1 stop14h 21m

Chicago O'Hare Intl

Mon 13/10

16:52-10:20

1 stop11h 28m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 3/10

08:40-18:04

2 stops15h 24m

Chicago O'Hare Intl

Tue 7/10

18:20-11:00

1 stop10h 40m

£422

Flights are sorted by cheapest return flights first.

Deals found on 13/9

Showing 1-10 of 60 results

...

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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of £595). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of £843). 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?

When flying from London Heathrow Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London Heathrow Airport to Illinois

The most flights from LHR to USIL are scheduled on a Sunday (54 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (42 on average).

Reviews of airlines servicing Illinois

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

1,323 reviews

Check prices

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

1,323 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Aer Lingus

7.2

Good

1,270 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Icelandair

7.0

Good

544 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Lufthansa

6.8

Okay

7,407 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

British Airways

6.7

Okay

7,361 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Related info for your journey

How long is the flight from London Heathrow Airport to Illinois?
Departing from London Heathrow Airport to Illinois will take you 11h 05m. The distance from London Heathrow Airport to Illinois is about 3939 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 £400 on Delta. Other airlines that offer cheap prices include Virgin Atlantic from £405 and Brussels Airlines from £407 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 (75%), Austrian Airlines (75%), United Airlines( 75%).
What are the cheapest flights from London Heathrow Airport to Illinois?
Looking at all options, your cheapest flight can be booked for £410. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £330 on average, our data indicates £802 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of £595). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of £843). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Heathrow to Illinois

Heathrow to John F Kennedy Intl flights

Heathrow to Newark flights

Heathrow to LaGuardia flights

Gatwick to Newark flights

London City to John F Kennedy Intl flights

Gatwick to John F Kennedy Intl flights

Gatwick to LaGuardia flights

London City to Newark flights

Heathrow to Miami flights

Heathrow to Orlando flights

Stansted to John F Kennedy Intl flights

Heathrow to Los Angeles flights

Luton to John F Kennedy Intl flights

Heathrow to Boston flights

Stansted to Newark flights

Heathrow to San Francisco flights

London City to LaGuardia flights

Luton to Newark flights

Heathrow to Dallas/Fort Worth flights

Heathrow to O'Hare Intl flights

Heathrow to Dulles Intl flights

Heathrow to Las Vegas flights

Gatwick to Orlando flights

Heathrow to Baltimore flights

Heathrow to Seattle flights

London City to Miami flights

Heathrow to Tampa flights

Gatwick to Miami flights

London City to Orlando flights

Heathrow to Atlanta flights

Heathrow to Hobby flights

London City to Los Angeles flights

London City to Boston flights

Heathrow to George Bush Intcntl flights

Gatwick to Los Angeles flights

Gatwick to Boston flights

Heathrow to Sky Harbor Intl flights

Gatwick to Las Vegas flights

Gatwick to San Francisco flights

Gatwick to O'Hare Intl flights

Heathrow to Midway flights

Stansted to Miami flights

Heathrow to Austin flights

Heathrow to Reagan-National flights

Heathrow to Philadelphia flights

Gatwick to Dulles Intl flights

Heathrow to Nashville flights

London City to O'Hare Intl flights

Gatwick to Dallas/Fort Worth flights

London City to San Francisco flights

Complete your trip

Illinois car hire

Chicago O'Hare Intl Airport car hire

Chicago Midway Airport car hire

Moline Quad-City Airport car hire

Greater Peoria Airport car hire

Bloomington-Normal Airport car hire

Champaign University-Willard Airport car hire

Springfield Capital Airport car hire

Chicago Greater Rockford Airport car hire

Belleville Airport car hire

Marion Williamson County Airport car hire

Quincy Regional Airport car hire

Direct flights to United States

Top 10 airlines flying from Heathrow to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£338	Average£449	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Scandinavian Airlines	Cheapest£350	Average£478	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£364	Average£608	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Aer Lingus	Cheapest£364	Average£568	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Virgin Atlantic	Cheapest£376	Average£533	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Brussels Airlines	Cheapest£389	Average£546	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Lufthansa	Cheapest£391	Average£570	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Austrian Airlines	Cheapest£397	Average£566	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
British Airways	Cheapest£400	Average£555	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£404	Average£670	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from London Heathrow Airport to Illinois from £347

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.

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 15 September 2025.

Round-trip from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Heathrow to Illinois

Cheapest flights from Heathrow to IllinoisExplore 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 15 September 2025.

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 15 September 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

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.

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?

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 15 September 2025.

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 15 September 2025.

Reviews of airlines servicing Illinois

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.

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?

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

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

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

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

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

How can I find direct flights from Heathrow to Illinois?

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

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

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.

Alternative routes for Heathrow to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Heathrow to Illinois

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?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 15 September 2025.