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Cheap flights from Illinois to London from £170

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 26/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
31 Aug — 7 Sep1
1 adult

Cheap flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated 26 August 2025.

Round-trip from

£373

One-way from

£170

Popular in

June

Cheapest in

February

Average price

£527

Good round-trip deal

£380 or less

Good one-way deal

£295 or less
Icelandair
  • Icelandair
  • 20/9-9/11
  • 2 total stops
  • 21h 35m total
  • Illinois to London
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WestJet
  • WestJet
  • 26/10
  • 1 total stop
  • 17h 30m total
  • Illinois to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£112 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Illinois to London (LON).
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Price to beat on a one-way flight from Illinois to London (LON).
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Find flight deals from Illinois to London

Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 August 2025.

Sat 20/919:25ORD - LHR
1 stop10h 30mIcelandair
Sun 9/1112:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 25/8£373
Wed 5/1119:20ORD - STN
2 stops21h 30mMultiple Airlines
Wed 12/1114:45STN - ORD
2 stops32h 00mMultiple Airlines
Deal found 26/8£373
Fri 7/1119:20ORD - LHR
2 stops15h 05mScandinavian Airlines
Thu 13/1107:05LHR - ORD
2 stops15h 40mScandinavian Airlines
Deal found 24/8£374
Sun 7/922:15ORD - LGW
1 stop10h 25mIcelandair
Fri 19/915:40LGW - ORD
1 stop11h 35mIcelandair
Deal found 24/8£374
Mon 22/919:25ORD - LHR
1 stop10h 30mIcelandair
Tue 21/1021:25LHR - ORD
1 stop26h 50mIcelandair
Deal found 24/8£374
Sun 9/1119:20ORD - LTN
2 stops20h 40mMultiple Airlines
Fri 14/1120:55LTN - ORD
2 stops25h 50mMultiple Airlines
Deal found 25/8£374
Fri 10/1022:15ORD - LGW
1 stop10h 25mIcelandair
Sun 12/1015:40LGW - ORD
1 stop32h 35mIcelandair
Deal found 25/8£374
Mon 27/1020:20ORD - LHR
1 stop32h 00mScandinavian Airlines
Sun 9/1118:40LHR - ORD
1 stop28h 05mScandinavian Airlines
Deal found 24/8£375
Tue 25/1109:41MDW - LHR
1 stop15h 24mVirgin Atlantic
Thu 4/1211:05LHR - MDW
1 stop13h 02mVirgin Atlantic
Deal found 25/8£375
Mon 8/919:25ORD - LGW
1 stop10h 20mIcelandair
Fri 12/915:40LGW - ORD
1 stop11h 35mIcelandair
Deal found 25/8£375
Fri 17/1019:25ORD - LHR
1 stop10h 30mIcelandair
Sun 26/1020:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/8£376
Sun 7/919:25ORD - LHR
1 stop10h 30mIcelandair
Fri 19/913:05LHR - ORD
1 stop14h 10mIcelandair
Deal found 25/8£377

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois to London 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 26 August 2025.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Illinois

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 5/11

19:20-22:50

2 stops21h 30m

London Stansted

Wed 12/11

14:45-16:45

2 stops32h 00m

£373

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 23/9

19:25-11:55

1 stop10h 30m

London Heathrow

Tue 30/9

21:25-18:15

1 stop26h 50m

£374

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sun 9/11

19:20-22:00

2 stops20h 40m

London Luton

Fri 14/11

20:55-16:45

2 stops25h 50m

£374

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 10/10

22:15-14:40

1 stop10h 25m

London Gatwick

Sun 12/10

15:40-18:15

1 stop32h 35m

£374

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 14/9

22:15-14:40

1 stop10h 25m

London Gatwick

Wed 24/9

15:35-21:15

1 stop11h 40m

£377

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 19/9

22:15-14:40

1 stop10h 25m

London Gatwick

Tue 23/9

15:40-18:15

1 stop32h 35m

£377

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 5/9

22:15-11:45

1 stop31h 30m

London Gatwick

Fri 12/9

15:40-21:15

1 stop11h 35m

£379

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 12/11

19:20-18:15

2 stops16h 55m

London Luton

Tue 18/11

18:55-16:45

3 stops27h 50m

£379

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 5/9

22:15-11:55

1 stop31h 40m

London Heathrow

Wed 10/9

21:25-18:15

1 stop26h 50m

£382

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 8/9

13:25-06:25

1 stop11h 00m

London Heathrow

Tue 16/9

06:15-15:00

1 stop14h 45m

£382

Flights are sorted by cheapest return flights first.

Deals found on 25/8

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

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

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

Currently, January is the cheapest month in which you can book a flight from Illinois to London (average of £112). Flying from Illinois to London in August is currently the most expensive (average of £164). 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 IL to LON?

Find hourly flight availability from Illinois to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 August 2025.

When flying from Illinois to London, 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 Illinois to London

Explore weekly flight availability from Illinois to London. 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 26 August 2025.

The most flights from USIL to LON are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (51 on average).

Related info for your journey

Find useful and relevant information for your journey from Illinois to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to London?

    Departing from Illinois to London will take you 10h 26m. Illinois and London are separated by a distance of 3939 mi. This flight may include one or multiple stops.

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

    When deciding which route to take from Illinois to London consider Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City as they are the most popular.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to London on time: Air Canada (63%), Austrian Airlines (63%), United Airlines (63%).

  • What are the cheapest flights from Illinois to London?

    Looking for the cheapest flight from Illinois to London? While on average our users pay £1,532, our data indicates the cheapest price to be £281. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £284.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to London 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 Illinois to London?

    Currently, January is the cheapest month in which you can book a flight from Illinois to London (average of £112). Flying from Illinois to London in August is currently the most expensive (average of £164). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
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Hounslow
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Slough
Luton
Deal
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Ilford
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Hayes
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Eastbourne
Dartford
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Romford

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Alternative routes for Illinois to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Illinois to London

Discover the top 7 airlines that operate flights from Illinois to London. 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 26 August 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£357Average£547FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£412Average£599FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£444Average£563FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£447Average£578FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£457Average£619FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£460Average£692FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest£497Average£626FlexibilityNo 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 Illinois to London?

Cheapflights helps you search for flights from Illinois to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Illinois to London for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to London from Illinois 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 Illinois to London become cheaper?

Yes, Cheapflights offers price alerts on Illinois to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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