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Cheap flights from London to Illinois from £369

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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
17 Apr — 24 Apr1
1 adult

Cheap flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated 12 April 2025.

Round-trip from

£416

One-way from

£369

Popular in

August

Cheapest in

February

Average price

£516

Good round-trip deal

£547 or less

Good one-way deal

£560 or less
British Airways
  • British Airways
  • 8/5-15/5
  • 1 total stop
  • 20h 15m total
  • London to Illinois
Search Deals
11/5
  • 11/5
  • 2 total stops
  • 39h 37m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£62 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 (LON) to Illinois.
Search Deals
Price to beat on a one-way flight from London (LON) to Illinois.
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Find flight deals from London to Illinois

Cheapest flights from London to Illinois
Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 April 2025.

Thu 8/507:40LHR - ORD
1 stop12h 20mBritish Airways
Thu 15/517:00ORD - LHR
Nonstop7h 55mBritish Airways
Deal found 11/4£416
Tue 6/516:35STN - ORD
2 stops34h 40mMultiple Airlines
Wed 14/519:25ORD - STN
2 stops21h 05mMultiple Airlines
Deal found 11/4£416
Tue 6/508:45LHR - ORD
2 stops15h 37mAir Canada
Wed 14/508:40ORD - LHR
1 stop15h 50mAir Canada
Deal found 11/4£417
Wed 30/409:25LCY - ORD
1 stop12h 30mSWISS
Tue 13/519:05ORD - LCY
1 stop11h 25mSWISS
Deal found 11/4£418
Wed 7/506:50LHR - ORD
2 stops13h 57mMultiple Airlines
Wed 14/512:00ORD - LHR
2 stops12h 30mMultiple Airlines
Deal found 11/4£418
Fri 5/921:25LHR - ORD
1 stop29h 50mIcelandair
Sat 13/919:25ORD - LHR
1 stop10h 30mIcelandair
Deal found 11/4£420
Thu 1/514:00LGW - ORD
2 stops16h 58mMultiple Airlines
Thu 8/505:51ORD - LGW
1 stop18h 29mMultiple Airlines
Deal found 10/4£422
Wed 7/506:30LHR - ORD
1 stop14h 10mVirgin Atlantic
Wed 14/513:30ORD - LHR
2 stops17h 05mVirgin Atlantic
Deal found 11/4£422
Sat 19/420:05LHR - ORD
1 stop22h 05mSWISS
Fri 2/518:35ORD - LHR
1 stop12h 25mSWISS
Deal found 11/4£424
Wed 10/915:40LGW - ORD
1 stop11h 35mIcelandair
Wed 17/919:25ORD - LGW
1 stop13h 15mIcelandair
Deal found 11/4£426
Fri 16/512:20LGW - ORD
1 stop31h 15mBritish Airways
Mon 19/517:57ORD - LGW
1 stop32h 38mBritish Airways
Deal found 11/4£427
Sat 19/414:05LHR - ORD
1 stop11h 55mUnited Airlines
Fri 2/508:40ORD - LHR
1 stop15h 50mUnited Airlines
Deal found 11/4£430

Cheapflights Fare Finder

Customise your flight search to find flights from London 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 12 April 2025.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

London

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 8/5

07:40-14:00

1 stop12h 20m

Chicago O'Hare Intl

Thu 15/5

17:00-06:55

Nonstop7h 55m

£416

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 6/5

16:35-21:15

2 stops34h 40m

Chicago O'Hare Intl

Wed 14/5

19:25-22:30

2 stops21h 05m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 6/5

08:45-18:22

2 stops15h 37m

Chicago O'Hare Intl

Wed 14/5

08:40-06:30

1 stop15h 50m

£417

LondonChicago

LCY - ORD

LCYORD

London City

Wed 30/4

09:25-15:55

1 stop12h 30m

Chicago O'Hare Intl

Tue 13/5

19:05-12:30

1 stop11h 25m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 7/5

06:50-14:47

2 stops13h 57m

Chicago O'Hare Intl

Wed 14/5

12:00-06:30

2 stops12h 30m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 5/9

21:25-21:15

1 stop29h 50m

Chicago O'Hare Intl

Sat 13/9

19:25-11:55

1 stop10h 30m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 7/5

06:30-14:40

1 stop14h 10m

Chicago O'Hare Intl

Wed 14/5

13:30-12:35

2 stops17h 05m

£422

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 1/5

14:00-00:58

2 stops16h 58m

Chicago O'Hare Intl

Thu 8/5

05:51-06:20

1 stop18h 29m

£422

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 30/4

14:10-17:15

Nonstop9h 05m

Chicago O'Hare Intl

Tue 13/5

16:05-06:20

Nonstop8h 15m

£424

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 10/9

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Wed 17/9

19:25-14:40

1 stop13h 15m

£426

Flights are sorted by cheapest return flights first.

Deals found on 9/4

Showing 1-10 of 60 results
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Best time to book a flight from London to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from London 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 to Illinois

What is the cheapest month to book a flight from London to Illinois?

Currently, January is the cheapest month in which you can book a flight from London to Illinois (average of £595). Flying from London 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 LON to IL?

Find hourly flight availability from London 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 12 April 2025.

When flying from London 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 to Illinois

Explore weekly flight availability from London 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 12 April 2025.

The most flights from LON 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).

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 12 April 2025.
To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and LOT. 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
7,912 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

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
7,912 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

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
1,321 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

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
LOT
7.6
Good
1,065 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

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
1,269 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

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
7.6
Good
774 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

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 London 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 to Illinois one-way?

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as £380. Users have also found prices from £384 and £403 on Aer Lingus and WestJet, respectively.

  • What are the most popular routes from London to Illinois?

    While some choose either London Gatwick - Chicago O'Hare Intl or London Heathrow - Chicago Midway, London Heathrow - Chicago O'Hare Intl is the most popular route from London to Illinois.

  • What are the most reliable airlines from London to Illinois?

    Before booking your flight to Illinois from London, check out the most reliable airlines to get you to your destination on time: United Airlines (95%), Austrian Airlines (93%), Brussels Airlines( 93%).

  • What are the cheapest flights from London to Illinois?

    Looking for the cheapest flight from London to Illinois? While on average our users pay £1,518, our data indicates the cheapest price to be £426. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £382.

  • Can I find deals for flights from London to Illinois that include hotel bookings?

    Yes. In addition to deals on London to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Illinois.

  • Can I find deals for business class flights from London to Illinois?

    Yes. Cheapflights offers flight deals from London 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 to Illinois?

    Currently, January is the cheapest month in which you can book a flight from London to Illinois (average of £595). Flying from London 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 London 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 London to Illinois

Discover the top 10 airlines that operate flights from London 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 12 April 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£321Average£494FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£364Average£510FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£378Average£605FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£414Average£642FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£418Average£575FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£420Average£593FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£424Average£578FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£428Average£609FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£433Average£665FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Aer LingusCheapest£440Average£591FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Illinois from London today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from London to Illinois?

Cheapflights simply makes it quick and affordable to book flights from London to Illinois by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from London to Illinois with no change fees?

Certainly. Search results for flights to Illinois from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from London to Illinois become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Illinois from London today and book when prices fit your budget.

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