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Cheap flights from London to Illinois from £283

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 28/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
25 May — 1 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap 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 25 April 2026.

Thu 26/1108:30
STN
-
ORD
2 stops14h 50m
Multiple Airlines
Sat 5/1218:30
ORD
-
STN
2 stops22h 40m
Multiple Airlines
Deal found 21/4£511
Tue 10/1106:30
STN
-
ORD
2 stops16h 50m
Multiple Airlines
Thu 26/1118:30
ORD
-
STN
2 stops23h 10m
Multiple Airlines
Deal found 24/4£518
Thu 26/1110:20
LHR
-
ORD
1 stop12h 25m
Scandinavian Airlines
Tue 1/1219:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 20/4£519
Mon 11/506:30
STN
-
ORD
3 stops19h 38m
Multiple Airlines
Mon 25/509:55
ORD
-
STN
2 stops22h 45m
Multiple Airlines
Deal found 21/4£520
Mon 9/1111:55
LGW
-
ORD
1 stop11h 25m
Icelandair
Tue 17/1118:30
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 21/4£521
Thu 4/606:30
STN
-
ORD
2 stops18h 55m
Multiple Airlines
Thu 11/609:55
ORD
-
STN
2 stops30h 30m
Multiple Airlines
Deal found 20/4£521
Mon 11/511:05
LHR
-
ORD
Nonstop9h 05m
United Airlines
Tue 14/705:00
ORD
-
LHR
1 stop10h 25m
United Airlines
Deal found 21/4£522
Thu 7/506:30
STN
-
ORD
3 stops32h 30m
Multiple Airlines
Sun 10/514:15
ORD
-
STN
2 stops23h 15m
Multiple Airlines
Deal found 24/4£522
Fri 23/1006:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Fri 13/1119:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 23/4£524
Tue 16/609:40
LTN
-
ORD
2 stops17h 45m
Multiple Airlines
Tue 23/619:25
ORD
-
LTN
2 stops20h 45m
Multiple Airlines
Deal found 24/4£524
Tue 12/513:00
LGW
-
ORD
1 stop11h 15m
Icelandair
Sun 17/522:25
ORD
-
LGW
1 stop31h 20m
Icelandair
Deal found 20/4£525
Mon 11/510:25
LHR
-
ORD
1 stop14h 01m
United Airlines
Mon 13/718:15
ORD
-
LHR
Nonstop8h 15m
United Airlines
Deal found 21/4£525

Find flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated 25 April 2026.

Round-trip from

£520

One-way from

£283

Popular in

July

Cheapest in

February

Average price

£554

Good round-trip deal

£642 or less

Good one-way deal

£515 or less
11/5-25/5
  • 11/5-25/5
  • 5 total stops
  • 42h 23m total
  • London to Illinois
Search Deals
28/5
  • 28/5
  • 1 total stop
  • 15h 57m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£51 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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

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 25 April 2026.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 20/5

06:15-14:00

1 stop13h 45m

Chicago O'Hare Intl

Tue 26/5

21:00-15:30

1 stop12h 30m

£556

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 7/5

21:40-16:59

2 stops25h 19m

Chicago O'Hare Intl

Sun 10/5

14:15-13:25

2 stops17h 10m

£559

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 11/6

09:25-18:15

2 stops14h 50m

Chicago O'Hare Intl

Sun 14/6

09:55-22:20

2 stops30h 25m

£566

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 4/6

13:00-19:15

1 stop12h 15m

Chicago O'Hare Intl

Thu 11/6

21:00-23:25

1 stop20h 25m

£579

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 3/6

06:15-19:15

1 stop19h 00m

Chicago O'Hare Intl

Tue 16/6

21:00-13:25

1 stop10h 25m

£589

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 1/9

06:50-12:00

1 stop11h 10m

Chicago O'Hare Intl

Tue 8/9

18:35-09:00

Nonstop8h 25m

£596

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 11/9

08:00-16:00

1 stop14h 00m

Chicago O'Hare Intl

Sun 20/9

18:00-22:55

1 stop22h 55m

£599

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Wed 9/9

06:30-18:05

2 stops17h 35m

Chicago Midway

Wed 23/9

13:05-11:20

1 stop16h 15m

£625

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Tue 1/9

06:30-16:27

2 stops15h 57m

Chicago Midway

Tue 8/9

16:30-13:15

1 stop14h 45m

£626

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

15:00-22:40

1 stop13h 40m

Lambert-St Louis

Tue 22/9

11:18-06:50

1 stop13h 32m

£648

Flights are sorted by cheapest return flights first.

Deals found on 21/4

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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

How far ahead should I book a flight from London to Illinois?

The best time to book flights from London to Illinois is 34 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, September is the cheapest month in which you can book a flight from London to Illinois (average of £415). Flying from London to Illinois in January is currently the most expensive (average of £1,213). 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 25 April 2026.

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 25 April 2026.

The most flights from LON to USIL are scheduled on a Friday (52 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (48 on average).

How much does it cost for a return flight from London to Illinois?

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 25 April 2026.
Read reviews from past customers who have flown with Austrian Airlines,United Airlines, andIcelandair from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Austrian Airlines
7.6
Good
907 reviews
Check prices

Crew

8.1

Boarding

7.6

Food

6.8

Entertainment

6.8

Overall

7.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
Austrian Airlines
7.6
Good
907 reviews
Austrian Airlines
7.6
Good
907 reviews
Check prices

Crew

8.1

Boarding

7.6

Food

6.8

Entertainment

6.8

Overall

7.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
United Airlines
7.4
Good
9,653 reviews
Austrian Airlines
7.6
Good
907 reviews
Check prices

Crew

8.1

Boarding

7.6

Food

6.8

Entertainment

6.8

Overall

7.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
Icelandair
7.0
Good
641 reviews
Austrian Airlines
7.6
Good
907 reviews
Check prices

Crew

8.1

Boarding

7.6

Food

6.8

Entertainment

6.8

Overall

7.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
Lufthansa
6.8
Okay
7,950 reviews
Austrian Airlines
7.6
Good
907 reviews
Check prices

Crew

8.1

Boarding

7.6

Food

6.8

Entertainment

6.8

Overall

7.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.
British Airways
6.7
Okay
7,914 reviews
Austrian Airlines
7.6
Good
907 reviews
Check prices

Crew

8.1

Boarding

7.6

Food

6.8

Entertainment

6.8

Overall

7.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

KENNETH,Mar 2026

VIE - EWR

Everything was great, took off on time, arrived on time, boarding was smooth, food and movies were great.

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 11h 10m. Fly via United Airlines, TAP AIR PORTUGAL, or Delta 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 Icelandair. According to our data, you can fly for as low as £258. Users have also found prices from £309 and £321 on JetBlue and Austrian Airlines, respectively.

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

    While some choose either London Heathrow - Chicago Midway or London Stansted - 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 (87%), United Airlines (87%), Brussels Airlines( 87%).

  • What are the cheapest flights from London to Illinois?

    Looking for the cheapest flight from London to Illinois? While on average our users pay £1,071, our data indicates the cheapest price to be £428. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £424.

  • 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, September is the cheapest month in which you can book a flight from London to Illinois (average of £415). Flying from London to Illinois in January is currently the most expensive (average of £1,213). 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.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Stansted to John F Kennedy Intl flights
Gatwick to Newark flights
London City to John F Kennedy Intl flights
Heathrow to Los Angeles flights
Gatwick to LaGuardia flights
Heathrow to Orlando flights
Luton to John F Kennedy Intl flights
Stansted to Newark flights
Heathrow to Boston flights
Heathrow to Miami flights
Luton to Newark flights
Heathrow to Dulles Intl flights
Heathrow to Dallas/Fort Worth flights
Heathrow to O'Hare Intl flights
Manchester to John F Kennedy Intl flights
Manchester to Orlando flights
Gatwick to Orlando flights
Heathrow to San Francisco flights
London City to Newark flights
Heathrow to Baltimore flights
Heathrow to Las Vegas flights
Gatwick to Boston flights
Heathrow to Seattle flights
Gatwick to Los Angeles flights
Stansted to Los Angeles flights
London City to Los Angeles flights
Heathrow to Atlanta flights
Stansted to Orlando flights
Heathrow to Hobby flights
Manchester to Newark flights
Stansted to LaGuardia flights
London City to Boston flights
Stansted to Boston flights
Stansted to Miami flights
Gatwick to Miami flights
London City to Orlando flights
Heathrow to Tampa flights
Heathrow to Denver flights
Heathrow to George Bush Intcntl flights
Manchester to LaGuardia flights
London City to Miami flights
Heathrow to Reagan-National flights
Gatwick to Dulles Intl flights
Gatwick to O'Hare Intl flights
Heathrow to Austin flights
Stansted to Dulles Intl 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 25 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£343Average£555FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£347Average£496FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£362Average£631FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£367Average£512FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£384Average£508FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£392Average£562FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
British AirwaysCheapest£392Average£600FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£394Average£600FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£402Average£635FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£409Average£719FlexibilityNo 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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