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Cheap flights from London to Illinois from £289

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 21/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
16 Jul — 23 Jul1
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 11 July 2025.

Round-trip from

£408

One-way from

£289

Popular in

August

Cheapest in

February

Average price

£648

Good round-trip deal

£541 or less

Good one-way deal

£598 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 23/10-31/10
  • 2 total stops
  • 67h 10m total
  • London to Illinois
Search Deals
21/8
  • 21/8
  • 1 total stop
  • 30h 21m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£53 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 July 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 11 July 2025.

Thu 23/1010:35LGW - ORD
1 stop35h 35mTAP AIR PORTUGAL
Fri 31/1021:15ORD - LGW
1 stop31h 35mTAP AIR PORTUGAL
Deal found 10/7£408
Mon 1/1219:50LHR - ORD
2 stops50h 55mScandinavian Airlines
Sun 11/119:10ORD - LHR
1 stop14h 50mScandinavian Airlines
Deal found 10/7£408
Sun 24/818:45LHR - ORD
1 stop27h 55mTAP AIR PORTUGAL
Sun 31/818:00ORD - LHR
1 stop17h 45mTAP AIR PORTUGAL
Deal found 10/7£409
Mon 1/915:40LGW - ORD
1 stop11h 35mIcelandair
Mon 3/1118:30ORD - LGW
1 stop10h 25mIcelandair
Deal found 9/7£410
Sat 20/909:50LGW - ORD
2 stops24h 56mMultiple Airlines
Mon 29/910:27ORD - LGW
1 stop14h 28mMultiple Airlines
Deal found 9/7£411
Sat 6/906:30LHR - ORD
1 stop14h 25mLufthansa
Sun 14/916:00ORD - LHR
Nonstop8h 20mLufthansa
Deal found 10/7£411
Sat 6/921:25LHR - ORD
1 stop29h 50mIcelandair
Fri 12/922:15ORD - LHR
1 stop16h 05mIcelandair
Deal found 10/7£411
Thu 18/909:50LHR - ORD
1 stop11h 55mBritish Airways
Tue 30/916:55ORD - LHR
Nonstop7h 55mBritish Airways
Deal found 9/7£413
Tue 16/915:05LGW - ORD
1 stop24h 10mAmerican Airlines
Fri 26/913:59ORD - LGW
1 stop12h 11mAmerican Airlines
Deal found 11/7£417
Wed 10/908:40LHR - ORD
1 stop13h 15mMultiple Airlines
Sun 21/916:00ORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 10/7£417
Mon 15/911:35LGW - ORD
2 stops27h 40mBritish Airways
Mon 22/913:59ORD - LGW
1 stop12h 11mBritish Airways
Deal found 11/7£418
Mon 8/906:00LHR - ORD
1 stop15h 55mSWISS
Mon 15/919:05ORD - LHR
1 stop16h 45mSWISS
Deal found 9/7£419

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 11 July 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 23/10

10:35-16:10

1 stop35h 35m

Chicago O'Hare Intl

Fri 31/10

21:15-09:50

1 stop31h 35m

£408

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/12

19:50-16:45

2 stops50h 55m

Chicago O'Hare Intl

Wed 14/1

19:20-16:00

1 stop14h 40m

£408

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 24/8

18:45-16:40

1 stop27h 55m

Chicago O'Hare Intl

Sun 31/8

18:00-17:45

1 stop17h 45m

£409

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 1/9

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Mon 3/11

18:30-10:55

1 stop10h 25m

£410

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 20/9

09:50-04:46

2 stops24h 56m

Chicago O'Hare Intl

Mon 29/9

10:27-06:55

1 stop14h 28m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Sat 13/9

21:25-11:45

Nonstop8h 20m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

21:25-21:15

1 stop29h 50m

Chicago O'Hare Intl

Fri 12/9

22:15-20:20

1 stop16h 05m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 18/9

09:50-15:45

1 stop11h 55m

Chicago O'Hare Intl

Tue 30/9

16:55-06:50

Nonstop7h 55m

£413

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 16/9

15:05-09:15

1 stop24h 10m

Chicago O'Hare Intl

Fri 26/9

13:59-08:10

1 stop12h 11m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Sun 21/9

16:00-06:20

Nonstop8h 20m

£417

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 59 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 11 July 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 11 July 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).

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 11 July 2025.
Read reviews from past customers who have flown with Delta, KLM, andAir Transat from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,951 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Transat
7.8
Good
412 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
811 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,312 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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 Aer Lingus. According to our data, you can fly for as low as £394. Users have also found prices from £404 and £433 on Icelandair and TAP AIR PORTUGAL, respectively.

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

    While some choose either London Heathrow - Chicago Midway or London Gatwick - 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 (89%), Austrian Airlines (89%), United Airlines( 89%).

  • What are the cheapest flights from London to Illinois?

    Looking for the cheapest flight from London to Illinois? While on average our users pay £1,826, our data indicates the cheapest price to be £402. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £375.

  • 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£310Average£485FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£349Average£500FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£363Average£609FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Virgin AtlanticCheapest£381Average£578FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£389Average£600FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£394Average£572FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£397Average£575FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£398Average£567FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest£400Average£631FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£402Average£564FlexibilityNo cancel feeOn-time70%
Search British Airways 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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