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$470+ Cheap flights from Heathrow (LHR) to Illinois

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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
abr. 30 — may. 71
mié. 4/30
mié. 5/7
1 adult, Economy
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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 abril 25, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$552
(SWISS)

One-way from

$470
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$676

Good round-trip deal

$646 or less

Good one-way deal

$670 or less
Provider with most accurate pricing for London (LON)-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for London (LON)-Chicago (CHI) flights.
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From London Heathrow to Illinois
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One-way flight from London Heathrow to Illinois
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Highest demand for flights based on searches. 12% potential increase in price ($104 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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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 abril 25, 2025.

This SWISS deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/96:00 amLHR - ORD
1 stop12h 10mSWISS
dom. 5/112:20 pmORD - LHR
1 stop11h 35mSWISS
Deal found 4/25$552
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/281:05 pmLHR - ORD
1 stop11h 10mIcelandair
dom. 9/77:25 pmORD - LHR
1 stop10h 30mIcelandair
Deal found 4/25$553
This Travelocity deal was found by Cheapflights users on 4/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/308:40 amLHR - ORD
1 stop13h 15mMultiple Airlines
mié. 5/76:05 pmORD - LHR
Nonstop8h 15mMultiple Airlines
Deal found 4/23$554
This Lufthansa deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/18:30 amLHR - ORD
1 stop12h 15mLufthansa
lun. 5/54:05 pmORD - LHR
Nonstop8h 15mLufthansa
Deal found 4/24$559
This TravelUp deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/22:25 pmLHR - ORD
Nonstop8h 35mBritish Airways
dom. 5/410:20 pmORD - LHR
Nonstop7h 55mBritish Airways
Deal found 4/24$560
This Air Canada deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/256:50 amLHR - ORD
2 stops14h 00mAir Canada
lun. 9/293:50 pmORD - LHR
1 stop14h 00mAir Canada
Deal found 4/24$564
This World Air Fares deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/96:15 amLHR - ORD
1 stop13h 15mFinnair
dom. 5/184:40 pmORD - LHR
1 stop10h 50mFinnair
Deal found 4/24$573
This Kiwi.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/17:30 pmLHR - ORD
1 stop23h 50mAustrian Airlines
mié. 5/76:05 pmORD - LHR
Nonstop8h 15mAustrian Airlines
Deal found 4/25$575
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/29:30 amLHR - ORD
1 stop14h 52mUnited Airlines
jue. 5/151:07 pmORD - LHR
1 stop11h 38mUnited Airlines
Deal found 4/25$576
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/67:30 pmLHR - ORD
1 stop26h 40mScandinavian Airlines
lun. 10/137:15 pmORD - LHR
1 stop14h 45mScandinavian Airlines
Deal found 4/25$582
This American Airlines deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/12:25 pmLHR - ORD
Nonstop8h 35mAmerican Airlines
jue. 5/158:30 pmORD - LHR
Nonstop8h 00mAmerican Airlines
Deal found 4/24$584
This Netflights deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/811:45 amLHR - MDW
1 stop13h 00mVirgin Atlantic
lun. 5/126:38 pmMDW - LHR
1 stop12h 52mVirgin Atlantic
Deal found 4/25$591

Cheapflights Fare Finder

Customize 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 2,558,603 searches. Data last updated abril 25, 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

vie. 5/9

6:00 am-12:10 pm

1 stop12h 10m

Chicago O'Hare Intl

dom. 5/11

2:20 pm-7:55 am

1 stop11h 35m

$552

LondonChicago

LHR - ORD

LHRORD

London Heathrow

jue. 8/28

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

dom. 9/7

7:25 pm-11:55 am

1 stop10h 30m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

vie. 5/9

8:30 am-2:45 pm

1 stop12h 15m

Chicago O'Hare Intl

lun. 5/12

6:05 pm-8:20 am

Nonstop8h 15m

$556

LondonChicago

LHR - ORD

LHRORD

London Heathrow

jue. 5/8

8:40 am-6:22 pm

2 stops15h 42m

Chicago O'Hare Intl

dom. 5/11

2:00 pm-9:35 am

1 stop13h 35m

$557

LondonChicago

LHR - ORD

LHRORD

London Heathrow

mié. 5/14

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

mié. 5/21

5:55 pm-6:55 am

1 stop31h 00m

$558

LondonChicago

LHR - ORD

LHRORD

London Heathrow

vie. 5/16

6:00 am-1:20 pm

1 stop13h 20m

Chicago O'Hare Intl

lun. 5/19

3:45 pm-9:40 am

1 stop35h 55m

$563

LondonChicago

LHR - ORD

LHRORD

London Heathrow

lun. 9/8

9:15 am-11:50 am

Nonstop8h 35m

Chicago O'Hare Intl

jue. 9/18

8:40 pm-10:30 am

Nonstop7h 50m

$565

LondonChicago

LHR - ORD

LHRORD

London Heathrow

vie. 5/9

6:15 am-1:30 pm

1 stop13h 15m

Chicago O'Hare Intl

dom. 5/18

4:40 pm-9:30 am

1 stop10h 50m

$573

LondonChicago

LHR - ORD

LHRORD

London Heathrow

vie. 9/5

6:00 am-1:20 pm

1 stop13h 20m

Chicago O'Hare Intl

vie. 9/26

2:53 pm-9:40 am

1 stop12h 47m

$580

LondonChicago

LHR - ORD

LHRORD

London Heathrow

lun. 10/6

7:30 pm-4:10 pm

1 stop26h 40m

Chicago O'Hare Intl

lun. 10/13

7:15 pm-4:00 pm

1 stop14h 45m

$582

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

Showing 1-10 of 59 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 round-trip 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of $245). Flying from London Heathrow Airport to Illinois in March is currently the most expensive (average of $321). 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 abril 25, 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 abril 25, 2025.

The most flights from LHR to USIL are scheduled on a Wednesday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (48 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 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 abril 25, 2025.
To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,920 reviews

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
7,920 reviews
Delta
8.0
Very good
7,920 reviews

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
1,333 reviews
Delta
8.0
Very good
7,920 reviews

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
1,272 reviews
Delta
8.0
Very good
7,920 reviews

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
7,920 reviews

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
1,582 reviews
Delta
8.0
Very good
7,920 reviews

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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?

    The cheapest airlines for a one-way flight from London Heathrow Airport to Illinois are TAP AIR PORTUGAL ($509), Aer Lingus ($521), and WestJet ($533).

  • 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?

    No one likes to see their flight delayed. When booking a flight from London Heathrow Airport to Illinois consider choosing United Airlines (90%), SWISS (89%) or Air Canada (87%) as they are the most reliable in getting you off to your destination on time.

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

    Looking for the cheapest flight from London Heathrow Airport to Illinois? While on average our users pay $2,248, our data indicates the cheapest price to be $549. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $493.

  • 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 vacation 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of $245). Flying from London Heathrow Airport to Illinois in March is currently the most expensive (average of $321). 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.

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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 Nashville flights
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London City to San Francisco flights
Luton to Newark flights
London City to O'Hare Intl flights
Heathrow to Midway 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 2,558,603 searches. Data last updated abril 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$580FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$569FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$483Average$677FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$551Average$798FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$562Average$845FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$574Average$729FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$776FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$583Average$798FlexibilityNo cancel feeOn-time71%
FinnairCheapest$613Average$852FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$660Average$1,001FlexibilityNo cancel feeOn-time76%

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