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Cheap flights from London Heathrow Airport to Illinois from £386

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 19/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
24 Jun — 1 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 19 June 2025.

Round-trip from

£415

One-way from

£386

Popular in

August

Cheapest in

February

Average price

£536

Good round-trip deal

£490 or less

Good one-way deal

£453 or less
British Airways
  • British Airways
  • 11/9-19/9
  • 2 total stops
  • 24h 44m total
  • London to Illinois
Aer Lingus
  • Aer Lingus
  • 19/9
  • 1 total stop
  • 11h 10m total
  • London to Illinois
Highest demand for flights based on searches. 12% potential increase in price (£56 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Average for round-trip flights in June 2025
Price to beat on a round-trip flight from London Heathrow to Illinois.
Price to beat on a one-way flight from London Heathrow to Illinois.

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 19 June 2025.

Thu 11/910:05LHR - ORD
1 stop13h 24mBritish Airways
Sat 20/918:52ORD - LHR
1 stop11h 53mBritish Airways
Deal found 17/6£415
Fri 29/808:30LHR - ORD
2 stops20h 55mLufthansa
Thu 9/1008:50ORD - LHR
1 stop16h 05mLufthansa
Deal found 18/6£416
Mon 8/908:40LHR - MDW
2 stops15h 57mDelta
Thu 18/909:30MDW - LHR
1 stop17h 25mDelta
Deal found 18/6£416
Fri 5/909:30LHR - ORD
2 stops14h 42mAir Canada
Sat 13/910:50ORD - LHR
1 stop15h 45mAir Canada
Deal found 18/6£417
Tue 9/906:30LHR - ORD
2 stops15h 43mDelta
Fri 19/918:10ORD - LHR
1 stop11h 15mDelta
Deal found 17/6£418
Fri 22/808:00LHR - ORD
1 stop14h 10mTAP AIR PORTUGAL
Mon 25/818:10ORD - LHR
1 stop34h 10mTAP AIR PORTUGAL
Deal found 18/6£419
Sun 7/906:30LHR - ORD
1 stop13h 40mKLM
Thu 18/913:16ORD - LHR
1 stop11h 29mKLM
Deal found 16/6£420
Fri 5/908:40LHR - MDW
2 stops18h 46mVirgin Atlantic
Wed 10/909:30MDW - LHR
2 stops15h 15mVirgin Atlantic
Deal found 17/6£420
Fri 5/906:50LHR - ORD
1 stop11h 15mBrussels Airlines
Mon 15/918:00ORD - LHR
Nonstop8h 20mBrussels Airlines
Deal found 17/6£421
Sat 23/820:05LHR - ORD
1 stop22h 05mMultiple Airlines
Sat 6/912:50ORD - LHR
1 stop12h 05mMultiple Airlines
Deal found 17/6£422
Mon 6/1010:20LHR - ORD
1 stop11h 50mScandinavian Airlines
Wed 5/1119:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 18/6£424
Thu 25/909:15LHR - ORD
Nonstop8h 35mAmerican Airlines
Sat 27/922:35ORD - LHR
Nonstop7h 40mAmerican Airlines
Deal found 18/6£428

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 19 June 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 11/9

10:05-17:29

1 stop13h 24m

Chicago O'Hare Intl

Sat 20/9

18:52-12:45

1 stop11h 53m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 29/8

08:30-23:25

2 stops20h 55m

Chicago O'Hare Intl

Thu 9/10

08:50-06:55

1 stop16h 05m

£416

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Mon 8/9

08:40-18:37

2 stops15h 57m

Chicago Midway

Thu 18/9

09:30-08:55

1 stop17h 25m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 5/9

09:30-18:12

2 stops14h 42m

Chicago O'Hare Intl

Sat 13/9

10:50-08:35

1 stop15h 45m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/9

06:30-16:13

2 stops15h 43m

Chicago O'Hare Intl

Fri 19/9

18:10-11:25

1 stop11h 15m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 22/8

08:00-16:10

1 stop14h 10m

Chicago O'Hare Intl

Mon 25/8

18:10-10:20

1 stop34h 10m

£419

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 7/9

06:30-14:10

1 stop13h 40m

Chicago O'Hare Intl

Thu 18/9

13:16-06:45

1 stop11h 29m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 5/9

06:50-12:05

1 stop11h 15m

Chicago O'Hare Intl

Mon 15/9

18:00-08:20

Nonstop8h 20m

£421

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 23/8

20:05-12:10

1 stop22h 05m

Chicago O'Hare Intl

Sat 6/9

12:50-06:55

1 stop12h 05m

£422

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Mon 24/11

06:20-18:07

2 stops17h 47m

Chicago Midway

Wed 3/12

13:00-06:55

2 stops11h 55m

£422

Flights are sorted by cheapest return flights first.

Deals found on 18/6

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.

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 19 June 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 19 June 2025.

The most flights from LHR to USIL are scheduled on a Monday (53 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (47 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 19 June 2025.
Read reviews from past customers who have flown Delta, KLM and Austrian Airlines from London to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

7.9

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very Good

Comfort

7.9

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Comfort

7.9

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 £386 on Aer Lingus. Other airlines that offer cheap prices include TAP AIR PORTUGAL from £406 and British Airways from £420 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?

    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 (93%), Austrian Airlines (93%), United Airlines( 93%).

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

    Looking at all options, your cheapest flight can be booked for £377. While the most popular route (London Heathrow - Chicago O'Hare Intl) can be booked for £333 on average our data indicates £1,529 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

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

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 19 June 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£344Average£477FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£353Average£502FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£367Average£608FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Virgin AtlanticCheapest£385Average£584FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£394Average£640FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£400Average£577FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£401Average£587FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£403Average£574FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest£404Average£625FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£408Average£708FlexibilityNo cancel feeOn-time70%
Search British Airways 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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Yes! Cheapflights helps users easily find flights from Heathrow to Illinois with no change fees.

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