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Cheap flights from London to Illinois from £244

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 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
14 Dec — 21 Dec1
1 adult
1 adult, Economy, 0 bags

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 14 November 2025.

Round-trip from

£413

One-way from

£244

Popular in

July

Cheapest in

February

Average price

£470

Good round-trip deal

£579 or less

Good one-way deal

£457 or less
Icelandair
  • Icelandair
  • 10/1-25/1
  • 2 total stops
  • 37h 05m total
  • London to Illinois
Search Deals
16/1
  • 16/1
  • 1 total stop
  • 14h 34m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£62 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 November 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.
Search Deals

Find flight deals from London to Illinois

Enter your travel dates to find the best prices.

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 14 November 2025.

Thu 20/1116:00LGW - ORD
1 stop29h 25mTAP AIR PORTUGAL
Sun 30/1120:25ORD - LGW
1 stop13h 20mTAP AIR PORTUGAL
Deal found 12/11£413
Tue 16/1220:35LHR - ORD
1 stop26h 45mIcelandair
Tue 6/118:30ORD - LHR
1 stop19h 00mIcelandair
Deal found 13/11£416
Wed 10/1211:55LGW - ORD
1 stop11h 25mIcelandair
Mon 15/1218:30ORD - LGW
1 stop10h 25mIcelandair
Deal found 12/11£419
Tue 18/1120:35LHR - ORD
1 stop26h 45mIcelandair
Thu 4/1218:30ORD - LHR
1 stop19h 00mIcelandair
Deal found 12/11£419
Thu 4/1209:00LTN - ORD
2 stops14h 20mMultiple Airlines
Wed 10/1218:30ORD - LTN
2 stops22h 35mMultiple Airlines
Deal found 13/11£419
Wed 3/1211:55LGW - ORD
1 stop11h 25mIcelandair
Wed 10/1218:30ORD - LGW
1 stop10h 25mIcelandair
Deal found 13/11£419
Thu 25/1215:35LHR - ORD
2 stops31h 10mScandinavian Airlines
Wed 31/1219:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 12/11£419
Wed 3/1212:15LHR - ORD
1 stop11h 05mIcelandair
Wed 10/1218:30ORD - LHR
1 stop19h 00mIcelandair
Deal found 13/11£422
Tue 2/1220:35LHR - ORD
1 stop26h 45mIcelandair
Mon 8/1218:30ORD - LHR
1 stop10h 20mIcelandair
Deal found 13/11£423
Sun 23/1120:35LHR - ORD
1 stop26h 45mIcelandair
Tue 2/1218:30ORD - LHR
1 stop10h 20mIcelandair
Deal found 12/11£423
Wed 19/1111:55LGW - ORD
1 stop11h 25mIcelandair
Wed 26/1118:30ORD - LGW
1 stop10h 25mIcelandair
Deal found 12/11£424
Wed 3/1208:50LGW - ORD
1 stop15h 05mMultiple Airlines
Wed 10/1215:50ORD - LGW
1 stop10h 20mMultiple Airlines
Deal found 12/11£425

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 14 November 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 15/1

10:20-16:45

1 stop12h 25m

Chicago O'Hare Intl

Sun 25/1

19:10-16:25

2 stops15h 15m

£416

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 17/1

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Tue 27/1

18:30-10:55

1 stop10h 25m

£421

LondonChicago

STN - ORD

STNORD

London Stansted

Wed 3/12

06:30-14:00

1 stop13h 30m

Chicago O'Hare Intl

Wed 10/12

15:50-07:50

1 stop10h 00m

£425

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 4/12

06:30-14:00

1 stop13h 30m

Chicago O'Hare Intl

Sun 7/12

19:40-13:20

1 stop11h 40m

£426

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 4/12

06:50-17:55

2 stops17h 05m

Chicago O'Hare Intl

Thu 11/12

15:50-23:00

2 stops25h 10m

£427

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/12

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Sun 7/12

19:20-18:30

1 stop17h 10m

£428

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 11/12

06:30-17:20

2 stops16h 50m

Chicago O'Hare Intl

Sun 14/12

18:30-23:00

2 stops22h 30m

£429

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 2/12

20:25-14:20

2 stops23h 55m

Chicago O'Hare Intl

Mon 8/12

17:20-20:00

2 stops20h 40m

£429

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 26/11

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Fri 5/12

18:30-10:55

1 stop10h 25m

£470

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 6/12

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Mon 8/12

18:30-10:55

1 stop10h 25m

£470

Flights are sorted by cheapest return flights first.

Deals found on 13/11

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, March is the cheapest month in which you can book a flight from London to Illinois (average of £307). Flying from London to Illinois in July is currently the most expensive (average of £511). 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 14 November 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 23% on flights from London to Illinois by exploring options for tickets in the evening.

What is the cheapest day to fly from London to Illinois?

Use this chart to determine the cheapest time to fly return from London to Illinois. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to Illinois flight should consider departing on Thursday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 14 November 2025.

The most flights from LON to USIL are scheduled on a Thursday (42 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (30 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 14 November 2025.
Read reviews from past customers who have flown with Finnair, Aer Lingus, andIcelandair from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,334 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Aer Lingus
7.2
Good
1,370 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Icelandair
7.1
Good
578 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Lufthansa
6.8
Okay
7,572 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,521 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Boarding

7.6

Comfort

7.4

Food

6.7

Overall

7.6

Entertainment

6.9

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

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.

  • How long is the flight from London to Illinois?

    There are many flights that can get you from London to Illinois in 8h 50m. Fly via Scandinavian Airlines, Icelandair, or British Airways to get the fastest option. Airlines will cover a distance of 3939 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from London to Illinois one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as £380. Users have also found prices from £384 and £400 on Lufthansa and British Airways, 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: Air Canada (84%), Austrian Airlines (84%), United Airlines( 84%).

  • What are the cheapest flights from London to Illinois?

    Looking for the cheapest flight from London to Illinois? While on average our users pay £1,294, our data indicates the cheapest price to be £370. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £309.

  • 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, March is the cheapest month in which you can book a flight from London to Illinois (average of £307). Flying from London to Illinois in July is currently the most expensive (average of £511). 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

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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 14 November 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£320Average£496FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£352Average£569FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Scandinavian AirlinesCheapest£367Average£490FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£376Average£623FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£377Average£601FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Brussels AirlinesCheapest£394Average£551FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£404Average£587FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£412Average£579FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£412Average£614FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£416Average£682FlexibilityNo cancel feeOn-time69%
Search United 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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