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Cheap flights from London to Illinois from £348

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 26/6. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
8 Jul — 15 Jul1
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 8 June 2026.

Mon 24/818:15
LGW
-
ORD
2 stops33h 10m
Multiple Airlines
Tue 1/919:25
ORD
-
LGW
2 stops14h 35m
Multiple Airlines
Deal found 3/6£543
Sun 20/908:50
LHR
-
ORD
1 stop11h 10m
British Airways
Thu 24/922:35
ORD
-
LHR
Nonstop7h 40m
British Airways
Deal found 4/6£543
Fri 18/906:20
LTN
-
ORD
1 stop13h 40m
Multiple Airlines
Fri 25/921:00
ORD
-
LTN
1 stop14h 25m
Multiple Airlines
Deal found 4/6£543
Wed 19/822:45
STN
-
ORD
2 stops27h 07m
Multiple Airlines
Tue 25/822:25
ORD
-
STN
2 stops18h 15m
Multiple Airlines
Deal found 3/6£543
Wed 7/1007:05
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Wed 14/1019:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Deal found 7/6£543
Mon 24/822:00
STN
-
ORD
3 stops28h 05m
Multiple Airlines
Tue 1/917:35
ORD
-
STN
2 stops23h 05m
Multiple Airlines
Deal found 3/6£543
Wed 7/1015:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Tue 13/1019:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 4/6£544
Thu 12/1107:05
LHR
-
ORD
2 stops15h 40m
Scandinavian Airlines
Mon 16/1119:15
ORD
-
LHR
1 stop14h 45m
Scandinavian Airlines
Deal found 7/6£544
Fri 4/922:50
STN
-
ORD
2 stops27h 02m
Multiple Airlines
Sat 5/922:25
ORD
-
STN
2 stops18h 50m
Multiple Airlines
Deal found 4/6£544
Mon 15/607:45
LGW
-
ORD
2 stops19h 40m
Multiple Airlines
Mon 29/619:25
ORD
-
LGW
2 stops19h 40m
Multiple Airlines
Deal found 3/6£545
Thu 5/1106:40
LHR
-
ORD
1 stop16h 05m
Scandinavian Airlines
Mon 9/1119:15
ORD
-
LHR
2 stops17h 35m
Scandinavian Airlines
Deal found 4/6£545
Mon 17/822:45
STN
-
ORD
2 stops27h 07m
Multiple Airlines
Mon 24/822:25
ORD
-
STN
2 stops18h 25m
Multiple Airlines
Deal found 4/6£545

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 8 June 2026.

Round-trip from

£543

One-way from

£348

Popular in

July

Cheapest in

February

Average price

£660

Good round-trip deal

£702 or less

Good one-way deal

£579 or less
24/8-1/9
  • 24/8-1/9
  • 4 total stops
  • 47h 45m total
  • London to Illinois
Search Deals
26/6
  • 26/6
  • 3 total stops
  • 30h 56m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£75 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 June 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 8 June 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

LHR - ORD

LHRORD

London Heathrow

Sun 25/10

20:35-18:20

1 stop26h 45m

Chicago O'Hare Intl

Tue 3/11

18:30-10:50

1 stop10h 20m

£543
Fastest return journey

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/9

12:15-15:00

Nonstop8h 45m

Chicago O'Hare Intl

Wed 23/9

17:50-07:40

Nonstop7h 50m

£558

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 10/11

13:35-16:55

Nonstop9h 20m

Chicago O'Hare Intl

Tue 17/11

17:45-07:55

Nonstop8h 10m

£558

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/9

08:50-14:00

1 stop11h 10m

Chicago O'Hare Intl

Sun 13/9

21:00-10:50

Nonstop7h 50m

£559

LondonChicago

LCY - ORD

LCYORD

London City

Wed 7/10

13:45-19:15

1 stop11h 30m

Chicago O'Hare Intl

Wed 14/10

15:45-10:20

1 stop12h 35m

£563

LondonChicago

LTN - ORD

LTNORD

London Luton

Fri 9/10

06:25-17:50

2 stops17h 25m

Chicago O'Hare Intl

Mon 12/10

15:45-09:15

1 stop11h 30m

£569

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 10/7

12:20-19:15

1 stop12h 55m

Chicago O'Hare Intl

Tue 21/7

10:56-09:35

1 stop16h 39m

£580

LondonChicago

LTN - ORD

LTNORD

London Luton

Fri 28/8

06:20-19:52

2 stops19h 32m

Chicago O'Hare Intl

Wed 2/9

15:45-21:15

2 stops23h 30m

£588

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 30/6

21:25-21:25

1 stop30h 00m

Chicago O'Hare Intl

Wed 8/7

19:25-11:55

1 stop10h 30m

£595

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 7/10

08:25-19:50

1 stop17h 25m

Chicago O'Hare Intl

Wed 14/10

21:50-19:05

1 stop15h 15m

£607

Flights are sorted by cheapest return flights first.

Deals found on 4/6

Showing 1-10 of 60 resultsSorted by cheapest first
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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, September is the cheapest month in which you can book a flight from London to Illinois (average of £440). Flying from London to Illinois in January is currently the most expensive (average of £1,283). 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 8 June 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 8 June 2026.

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

How much does it cost for a return 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 31 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.

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 8 June 2026.
Read reviews from past customers who have flown with United Airlines,Aer Lingus, andIcelandair from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,785 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
9,785 reviews
United Airlines
7.4
Good
9,785 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Aer Lingus
7.3
Good
1,600 reviews
United Airlines
7.4
Good
9,785 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Icelandair
7.0
Good
670 reviews
United Airlines
7.4
Good
9,785 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Lufthansa
6.8
Okay
8,048 reviews
United Airlines
7.4
Good
9,785 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
British Airways
6.7
Okay
8,031 reviews
United Airlines
7.4
Good
9,785 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Comfort

7.3

Food

6.6

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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 45m. Fly via Icelandair, British Airways, or Lufthansa 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 JetBlue. According to our data, you can fly for as low as £313. Users have also found prices from £325 and £327 on Austrian Airlines and Icelandair, respectively.

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

    While some choose either London Gatwick - Chicago O'Hare Intl 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: SriLankan Airlines (93%), Malaysia Airlines (93%), Air Canada( 91%).

  • What are the cheapest flights from London to Illinois?

    Looking for the cheapest flight from London to Illinois? While on average our users pay £1,181, our data indicates the cheapest price to be £456. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £428.

  • 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 £440). Flying from London to Illinois in January is currently the most expensive (average of £1,283). 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.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
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Heathrow to Tampa flights
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Stansted to Miami flights
Heathrow to Baltimore flights
Heathrow to George Bush Intcntl flights
London City to Orlando flights
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Manchester to Newark flights
Gatwick to San Francisco flights
London City to San Francisco flights
Edinburgh to Boston flights
Heathrow to Ontario flights
Manchester to LaGuardia flights
Heathrow to Nashville flights
Stansted 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 8 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£304Average£600FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£353Average£509FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£366Average£656FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£372Average£528FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£388Average£533FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£397Average£593FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£402Average£630FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£405Average£637FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£423Average£627FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Austrian AirlinesCheapest£423Average£650FlexibilityNo cancel feeOn-time78%
Search Austrian 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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