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Cheap flights from London Heathrow Airport to Illinois from £291

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
16 Jul — 23 Jul1
1 adult

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 11 July 2025.

Round-trip from

£408

One-way from

£291

Popular in

August

Cheapest in

February

Average price

£648

Good round-trip deal

£541 or less

Good one-way deal

£598 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 1/12-14/1
  • 3 total stops
  • 65h 35m total
  • London to Illinois
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14/10
  • 14/10
  • 3 total stops
  • 46h 37m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£53 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 July 2025
Search Deals
Price to beat on a round-trip flight from London Heathrow to Illinois.
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Price to beat on a one-way flight from London Heathrow to Illinois.
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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 11 July 2025.

Mon 1/1219:50LHR - ORD
2 stops50h 55mScandinavian Airlines
Sun 11/119:10ORD - LHR
1 stop14h 50mScandinavian Airlines
Deal found 10/7£408
Sun 24/818:45LHR - ORD
1 stop27h 55mTAP AIR PORTUGAL
Sun 31/818:00ORD - LHR
1 stop17h 45mTAP AIR PORTUGAL
Deal found 10/7£409
Sat 6/906:30LHR - ORD
1 stop14h 25mLufthansa
Sun 14/916:00ORD - LHR
Nonstop8h 20mLufthansa
Deal found 10/7£411
Sat 6/921:25LHR - ORD
1 stop29h 50mIcelandair
Fri 12/922:15ORD - LHR
1 stop16h 05mIcelandair
Deal found 10/7£411
Thu 18/909:50LHR - ORD
1 stop11h 55mBritish Airways
Tue 30/916:55ORD - LHR
Nonstop7h 55mBritish Airways
Deal found 9/7£413
Wed 10/908:40LHR - ORD
1 stop13h 15mMultiple Airlines
Sun 21/916:00ORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 10/7£417
Mon 8/906:00LHR - ORD
1 stop15h 55mSWISS
Mon 15/919:05ORD - LHR
1 stop16h 45mSWISS
Deal found 9/7£419
Wed 10/915:05LHR - ORD
1 stop28h 15mAustrian Airlines
Wed 17/912:50ORD - LHR
1 stop15h 50mAustrian Airlines
Deal found 9/7£420
Thu 25/906:50LHR - ORD
2 stops14h 05mAir Canada
Mon 29/910:50ORD - LHR
1 stop13h 40mAir Canada
Deal found 10/7£424
Sun 17/811:55LHR - ORD
1 stop29h 24mJetBlue
Fri 22/806:15ORD - LHR
1 stop32h 30mJetBlue
Deal found 9/7£436
Fri 31/1006:30LHR - MDW
2 stops20h 14mVirgin Atlantic
Sat 8/1118:45MDW - LHR
1 stop11h 30mVirgin Atlantic
Deal found 9/7£437
Wed 20/809:20LHR - MDW
1 stop14h 27mKLM
Sun 14/919:15MDW - LHR
1 stop11h 55mKLM
Deal found 10/7£445

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 11 July 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

Mon 1/12

19:50-16:45

2 stops50h 55m

Chicago O'Hare Intl

Wed 14/1

19:20-16:00

1 stop14h 40m

£408

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 24/8

18:45-16:40

1 stop27h 55m

Chicago O'Hare Intl

Sun 31/8

18:00-17:45

1 stop17h 45m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Sat 13/9

21:25-11:45

Nonstop8h 20m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

21:25-21:15

1 stop29h 50m

Chicago O'Hare Intl

Fri 12/9

22:15-20:20

1 stop16h 05m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 18/9

09:50-15:45

1 stop11h 55m

Chicago O'Hare Intl

Tue 30/9

16:55-06:50

Nonstop7h 55m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Sun 21/9

16:00-06:20

Nonstop8h 20m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 8/9

06:00-15:55

1 stop15h 55m

Chicago O'Hare Intl

Mon 15/9

19:05-17:50

1 stop16h 45m

£419

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

09:05-13:20

1 stop34h 15m

Chicago O'Hare Intl

Wed 17/9

18:00-08:20

Nonstop8h 20m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 25/9

06:50-14:55

2 stops14h 05m

Chicago O'Hare Intl

Mon 29/9

10:50-06:30

1 stop13h 40m

£424

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 17/8

11:55-11:19

1 stop29h 24m

Chicago O'Hare Intl

Fri 22/8

06:15-20:45

1 stop32h 30m

£436

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 47 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, 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?

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 11 July 2025.

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

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 11 July 2025.

The most flights from LHR to USIL are scheduled on a Monday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (48 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 11 July 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Illinois, such as Delta, KLM, andAustrian Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,951 reviews
Check prices

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,951 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
811 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,312 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,467 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

  • 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 £394 on Aer Lingus. Other airlines that offer cheap prices include Icelandair from £406 and WestJet from £542 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 (89%), Austrian Airlines (89%), United Airlines( 89%).

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

    Looking at all options, your cheapest flight can be booked for £402. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £375 on average our data indicates £1,826 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

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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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£340Average£467FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£349Average£500FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£363Average£609FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Virgin AtlanticCheapest£381Average£578FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£389Average£600FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£394Average£572FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£397Average£575FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£398Average£567FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest£400Average£631FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£402Average£564FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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

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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.

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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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