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Cheap flights from London Heathrow Airport to Illinois from £310

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 19/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
13 Mar — 20 Mar1
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 8 March 2025.

Round-trip from

£410

One-way from

£310

Popular in

August

Cheapest in

February

Average price

£494

Good round-trip deal

£567 or less

Good one-way deal

£585 or less
Air Canada
  • Air Canada
  • 25/4-29/4
  • 2 total stops
  • 29h 35m total
  • London to Illinois
Search Deals
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 12/6
  • 1 total stop
  • 14h 10m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£57 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 March 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.
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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 8 March 2025.

Fri 14/307:40LHR - ORD
1 stop12h 30mMultiple Airlines
Mon 17/320:30ORD - LHR
2 stops29h 40mMultiple Airlines
Deal found 7/3£410
Mon 21/406:30LHR - ORD
1 stop12h 25mLufthansa
Mon 28/418:05ORD - LHR
Nonstop8h 15mLufthansa
Deal found 7/3£411
Thu 20/308:55LHR - ORD
1 stop13h 20mUnited Airlines
Thu 27/310:00ORD - LHR
2 stops16h 10mUnited Airlines
Deal found 6/3£413
Mon 17/306:00LHR - ORD
1 stop12h 55mSWISS
Mon 31/315:45ORD - LHR
1 stop13h 40mSWISS
Deal found 7/3£414
Mon 21/409:15LHR - ORD
Nonstop8h 30mFinnair
Mon 28/419:15ORD - LHR
Nonstop7h 55mFinnair
Deal found 7/3£420
Thu 1/509:15LHR - ORD
Nonstop8h 30mBritish Airways
Mon 5/517:40ORD - LHR
Nonstop7h 40mBritish Airways
Deal found 6/3£421
Mon 21/408:30LHR - ORD
Nonstop9h 05mAustrian Airlines
Mon 28/416:05ORD - LHR
Nonstop8h 15mAustrian Airlines
Deal found 7/3£423
Fri 16/506:30LHR - ORD
1 stop13h 40mVirgin Atlantic
Thu 22/510:05ORD - LHR
1 stop14h 40mVirgin Atlantic
Deal found 7/3£431
Mon 21/408:30LHR - ORD
Nonstop9h 05mBrussels Airlines
Mon 28/416:05ORD - LHR
Nonstop8h 15mBrussels Airlines
Deal found 7/3£431
Fri 21/312:30LHR - MDW
1 stop14h 53mAir France
Mon 24/313:16MDW - LHR
1 stop12h 49mAir France
Deal found 7/3£441
Fri 21/312:30LHR - MDW
1 stop14h 53mVirgin Atlantic
Mon 24/312:51MDW - LHR
1 stop12h 29mVirgin Atlantic
Deal found 7/3£442
Thu 24/411:20LHR - MDW
1 stop12h 39mKLM
Mon 28/415:02MDW - LHR
1 stop11h 53mKLM
Deal found 7/3£443

Find flights from Heathrow to Illinois within your budget

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 8 March 2025.

Fly from

Heathrow

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 17/3

20:05-17:15

1 stop26h 10m

Chicago O'Hare Intl

Sun 30/3

18:05-08:20

Nonstop8h 15m

£410

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 21/4

06:30-12:55

1 stop12h 25m

Chicago O'Hare Intl

Mon 28/4

18:05-08:20

Nonstop8h 15m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 1/5

06:00-13:20

1 stop13h 20m

Chicago O'Hare Intl

Mon 5/5

16:05-06:20

Nonstop8h 15m

£412

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 20/3

08:55-17:15

1 stop13h 20m

Chicago O'Hare Intl

Thu 27/3

10:00-07:10

2 stops16h 10m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 17/3

06:00-13:55

1 stop12h 55m

Chicago O'Hare Intl

Mon 31/3

15:45-11:25

1 stop13h 40m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 15/4

21:25-21:15

1 stop29h 50m

Chicago O'Hare Intl

Tue 29/4

19:30-11:55

1 stop10h 25m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 21/4

09:15-11:45

Nonstop8h 30m

Chicago O'Hare Intl

Mon 28/4

19:15-09:10

Nonstop7h 55m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 1/5

09:15-11:45

Nonstop8h 30m

Chicago O'Hare Intl

Mon 5/5

17:40-07:20

Nonstop7h 40m

£421

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 16/5

06:30-14:10

1 stop13h 40m

Chicago O'Hare Intl

Thu 22/5

10:05-06:45

1 stop14h 40m

£431

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 21/4

08:30-11:35

Nonstop9h 05m

Chicago O'Hare Intl

Mon 28/4

16:05-06:20

Nonstop8h 15m

£431

Flights are sorted by cheapest return flights first.

Deals found on 7/3

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.

Travel insights for flights from Heathrow to Illinois

Get recent, data-driven insights about flights from Heathrow to Illinois including ideal travel times, pricing trends, and more.

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 8 March 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.

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 8 March 2025.
Read reviews from past customers who have flown Delta, KLM and Finnair 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
8,024 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

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
8,024 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

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
1,322 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

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
1,271 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

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
7.5
Good
765 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

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

SWISS
7.5
Good
1,566 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Crew

8.5

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 £310 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Icelandair from £374 and Aer Lingus from £395 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 (92%), Austrian Airlines (92%), United Airlines( 92%).

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

    Looking at all options, your cheapest flight can be booked for £442. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £284 on average our data indicates £1,260 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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Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
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Stansted to Stewart flights
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Gatwick to LaGuardia flights
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Stansted to John F Kennedy Intl flights
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Gatwick to Orlando flights
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Gatwick to Boston flights
London City to Miami flights
Heathrow to Hobby flights
London City to Los Angeles flights
Gatwick to Los Angeles flights
Luton to John F Kennedy Intl flights
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London City to Orlando flights
Heathrow to Tampa flights
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London City to Boston flights
Heathrow to George Bush Intcntl flights
Gatwick to Las Vegas flights
Gatwick to San Francisco flights
Heathrow to Charlotte flights
Stansted to Boston flights
Stansted to Newark flights
Heathrow to Ontario flights
London City to Las Vegas flights
Gatwick to O'Hare Intl flights
London City to San Francisco flights
Gatwick to Dulles Intl flights
London City to Dulles Intl flights
London City to O'Hare Intl flights
Heathrow to Santa Ana 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 8 March 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£360Average£525FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£367Average£522FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£382Average£591FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
LufthansaCheapest£427Average£581FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£429Average£614FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£430Average£608FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£435Average£735FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£443Average£584FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Austrian AirlinesCheapest£454Average£591FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£463Average£734FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

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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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