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Cheap flights from London Heathrow Airport to Illinois from £389

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
5 May — 12 May1
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 30 April 2025.

Round-trip from

£415

One-way from

£389

Popular in

August

Cheapest in

February

Average price

£504

Good round-trip deal

£537 or less

Good one-way deal

£532 or less
Icelandair
  • Icelandair
  • 28/8-7/9
  • 2 total stops
  • 24h 40m total
  • London to Illinois
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14/5
  • 14/5
  • 2 total stops
  • 23h 42m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£58 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 30 April 2025.

Mon 5/506:00LHR - ORD
1 stop13h 20mMultiple Airlines
Mon 12/519:05ORD - LHR
1 stop11h 55mMultiple Airlines
Deal found 28/4£414
Thu 8/509:00LHR - ORD
1 stop15h 15mLufthansa
Fri 16/518:05ORD - LHR
Nonstop8h 15mLufthansa
Deal found 29/4£415
Thu 8/508:40LHR - ORD
2 stops15h 42mAir Canada
Sun 11/512:00ORD - LHR
2 stops12h 30mAir Canada
Deal found 29/4£415
Tue 13/512:10LHR - ORD
1 stop33h 45mUnited Airlines
Wed 21/516:25ORD - LHR
1 stop32h 30mUnited Airlines
Deal found 29/4£416
Tue 16/913:10LHR - ORD
Nonstop8h 45mBritish Airways
Tue 23/920:40ORD - LHR
Nonstop7h 50mBritish Airways
Deal found 29/4£419
Thu 15/513:05LHR - ORD
1 stop14h 10mIcelandair
Tue 3/619:25ORD - LHR
1 stop18h 55mIcelandair
Deal found 29/4£420
Fri 5/1214:10LHR - ORD
Nonstop8h 50mFinnair
Sat 17/118:45ORD - LHR
Nonstop7h 50mFinnair
Deal found 30/4£435
Mon 8/1207:05LHR - ORD
2 stops15h 40mScandinavian Airlines
Sun 14/1219:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 29/4£438
Fri 5/908:30LHR - ORD
Nonstop9h 00mAustrian Airlines
Wed 17/918:00ORD - LHR
Nonstop8h 20mAustrian Airlines
Deal found 29/4£439
Wed 7/506:30LHR - ORD
1 stop14h 10mDelta
Mon 19/520:12ORD - LHR
1 stop10h 58mDelta
Deal found 29/4£442
Thu 8/512:30LHR - ORD
1 stop14h 03mAmerican Airlines
Mon 19/515:58ORD - LHR
1 stop13h 07mAmerican Airlines
Deal found 29/4£443
Thu 18/911:45LHR - MDW
1 stop12h 51mVirgin Atlantic
Mon 22/909:30MDW - LHR
1 stop17h 25mVirgin Atlantic
Deal found 29/4£444

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 30 April 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

Thu 28/8

13:05-21:15

1 stop14h 10m

Chicago O'Hare Intl

Sun 7/9

19:25-11:55

1 stop10h 30m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 13/5

12:10-15:55

1 stop33h 45m

Chicago O'Hare Intl

Wed 21/5

16:25-06:55

1 stop32h 30m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 10/5

06:00-19:30

2 stops19h 30m

Chicago O'Hare Intl

Sun 18/5

10:53-10:00

2 stops17h 07m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 16/9

13:10-15:55

Nonstop8h 45m

Chicago O'Hare Intl

Tue 23/9

20:40-10:30

Nonstop7h 50m

£419

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 16/5

14:25-17:00

Nonstop8h 35m

Chicago O'Hare Intl

Tue 20/5

11:50-06:15

1 stop12h 25m

£423

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 15/5

08:40-14:10

1 stop11h 30m

Chicago O'Hare Intl

Tue 20/5

07:00-06:25

1 stop17h 25m

£426

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 13/5

06:00-12:10

1 stop12h 10m

Chicago O'Hare Intl

Wed 21/5

18:19-21:00

2 stops20h 41m

£429

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 13/5

11:05-14:10

Nonstop9h 05m

Chicago O'Hare Intl

Wed 21/5

19:45-12:20

1 stop34h 35m

£432

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 5/9

11:05-14:10

Nonstop9h 05m

Chicago O'Hare Intl

Sat 20/9

18:00-08:20

Nonstop8h 20m

£439

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 10/5

06:30-14:10

1 stop13h 40m

Chicago O'Hare Intl

Mon 19/5

14:45-11:25

1 stop14h 40m

£442

Flights are sorted by cheapest return flights first.

Deals found on 30/4

Showing 1-10 of 57 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 30 April 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 30 April 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 (46 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

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.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

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).

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 30 April 2025.
Read reviews from past customers who have flown Delta, Alaska Airlines and KLM from London to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,934 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Alaska Airlines
8.0
Very Good
9,968 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,275 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
780 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 £391 on Aer Lingus. Other airlines that offer cheap prices include TAP AIR PORTUGAL from £394 and SWISS from £416 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: United Airlines (90%), SWISS (89%), Air Canada( 87%).

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

    Looking at all options, your cheapest flight can be booked for £417. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £378 on average our data indicates £1,228 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

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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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Luton to Newark flights
Luton to Los Angeles flights
Gatwick to Miami flights
Gatwick to Hobby flights
Stansted to Newark flights
London City to LaGuardia flights
Heathrow to Midway flights
Gatwick to Seattle flights

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 30 April 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£345Average£479FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£354Average£501FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£368Average£601FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Austrian AirlinesCheapest£407Average£554FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£409Average£575FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£413Average£587FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£414Average£576FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£417Average£677FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Brussels AirlinesCheapest£422Average£635FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Aer LingusCheapest£427Average£579FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

Fly with Cheapflights

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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?

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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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