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Cheap flights from London to Illinois from £318

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 23/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
26 Mar — 2 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 21 March 2025.

Round-trip from

£415

One-way from

£318

Popular in

August

Cheapest in

February

Average price

£495

Good round-trip deal

£563 or less

Good one-way deal

£585 or less
British Airways
  • British Airways
  • 8/5-14/5
  • 2 total stops
  • 40h 29m total
  • London to Illinois
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23/5
  • 23/5
  • 1 total stop
  • 30h 41m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£59 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 March 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 21 March 2025.

Thu 8/515:05LGW - ORD
1 stop26h 04mBritish Airways
Wed 14/511:45ORD - LGW
1 stop14h 25mBritish Airways
Deal found 20/3£415
Mon 21/421:25LHR - ORD
1 stop26h 50mIcelandair
Fri 25/422:15ORD - LHR
1 stop16h 05mIcelandair
Deal found 20/3£415
Wed 24/915:40LGW - ORD
1 stop11h 35mIcelandair
Wed 1/1019:25ORD - LGW
1 stop13h 15mIcelandair
Deal found 21/3£416
Fri 2/508:40LHR - ORD
1 stop13h 15mUnited Airlines
Mon 12/508:50ORD - LHR
1 stop16h 05mUnited Airlines
Deal found 19/3£416
Tue 2/918:40LHR - ORD
1 stop24h 15mSWISS
Tue 23/919:05ORD - LHR
1 stop18h 15mSWISS
Deal found 20/3£417
Tue 29/410:00LGW - ORD
1 stop34h 26mMultiple Airlines
Fri 2/517:07ORD - LGW
1 stop34h 53mMultiple Airlines
Deal found 20/3£417
Sun 20/407:30LHR - ORD
1 stop13h 15mLufthansa
Fri 9/518:05ORD - LHR
Nonstop8h 15mLufthansa
Deal found 20/3£417
Sun 20/419:30LHR - ORD
1 stop23h 50mAustrian Airlines
Sun 27/411:15ORD - LHR
1 stop17h 25mAustrian Airlines
Deal found 20/3£419
Tue 22/422:35STN - ORD
2 stops25h 40mMultiple Airlines
Mon 28/419:25ORD - STN
2 stops19h 35mMultiple Airlines
Deal found 20/3£420
Sun 4/506:00LHR - ORD
1 stop12h 10mMultiple Airlines
Sun 11/514:55ORD - LHR
1 stop11h 45mMultiple Airlines
Deal found 20/3£421
Wed 7/506:50LHR - ORD
2 stops14h 05mAir Canada
Wed 14/514:00ORD - LHR
1 stop13h 35mAir Canada
Deal found 21/3£426
Thu 1/509:15LHR - ORD
Nonstop8h 30mBritish Airways
Mon 5/517:40ORD - LHR
Nonstop7h 40mBritish Airways
Deal found 20/3£428

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 21 March 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

LGW - ORD

LGWORD

London Gatwick

Thu 8/5

15:05-11:09

1 stop26h 04m

Chicago O'Hare Intl

Wed 14/5

11:45-08:10

1 stop14h 25m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 21/4

21:25-18:15

1 stop26h 50m

Chicago O'Hare Intl

Fri 25/4

22:15-20:20

1 stop16h 05m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 2/5

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Mon 12/5

08:50-06:55

1 stop16h 05m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 2/9

18:40-12:55

1 stop24h 15m

Chicago O'Hare Intl

Tue 23/9

19:05-19:20

1 stop18h 15m

£417

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 27/8

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Mon 8/9

19:25-11:45

1 stop10h 20m

£417

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 29/4

10:00-14:26

1 stop34h 26m

Chicago O'Hare Intl

Fri 2/5

17:07-10:00

1 stop34h 53m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 20/4

07:30-14:45

1 stop13h 15m

Chicago O'Hare Intl

Fri 9/5

18:05-08:20

Nonstop8h 15m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 20/4

19:30-13:20

1 stop23h 50m

Chicago O'Hare Intl

Sun 27/4

11:15-10:40

1 stop17h 25m

£419

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 22/4

22:35-18:15

2 stops25h 40m

Chicago O'Hare Intl

Mon 28/4

19:25-21:00

2 stops19h 35m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 4/5

06:00-12:10

1 stop12h 10m

Chicago O'Hare Intl

Sun 11/5

14:55-08:40

1 stop11h 45m

£421

Flights are sorted by cheapest return flights first.

Deals found on 19/3

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 21 March 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 21 March 2025.

The most flights from LON to USIL are scheduled on a Monday (37 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 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 21 March 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
7,892 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

8.0

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
7,892 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

8.0

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
1,319 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

8.0

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
1,061 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

8.0

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
1,266 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

8.0

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
768 reviews
Delta
8.0
Very Good
7,892 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Comfort

8.0

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 £327. Users have also found prices from £348 and £395 on Icelandair 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 City - Chicago O'Hare Intl, 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: Air Canada (93%), Austrian Airlines (93%), United 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 £1,796, our data indicates the cheapest price to be £435. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £350.

  • 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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London City to San Francisco flights

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 21 March 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£324Average£503FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£367Average£519FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£381Average£608FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£415Average£692FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£423Average£581FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£424Average£587FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Virgin AtlanticCheapest£428Average£612FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£429Average£602FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£449Average£588FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
American AirlinesCheapest£467Average£641FlexibilityNo cancel feeOn-time71%
Search American Airlines 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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