Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London to Illinois from £300

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 25/6. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
18 Jun — 25 Jun1
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 13 June 2025.

Round-trip from

£411

One-way from

£300

Popular in

August

Cheapest in

February

Average price

£530

Good round-trip deal

£472 or less

Good one-way deal

£449 or less
Lufthansa
  • Lufthansa
  • 15/9-22/9
  • 2 total stops
  • 26h 15m total
  • London to Illinois
Search Deals
25/6
  • 25/6
  • 3 total stops
  • 39h 24m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£55 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 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

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 13 June 2025.

Mon 15/912:50LTN - ORD
2 stops33h 20mMultiple Airlines
Mon 22/919:15ORD - LTN
2 stops20h 10mMultiple Airlines
Deal found 10/6£411
Mon 15/916:10STN - ORD
2 stops30h 00mMultiple Airlines
Mon 22/919:15ORD - STN
2 stops20h 55mMultiple Airlines
Deal found 10/6£411
Thu 4/913:05LGW - ORD
1 stop16h 05mMultiple Airlines
Thu 11/920:12ORD - LGW
1 stop28h 08mMultiple Airlines
Deal found 10/6£412
Wed 10/913:30LHR - ORD
1 stop12h 25mLufthansa
Sat 20/922:30ORD - LHR
1 stop13h 10mLufthansa
Deal found 12/6£412
Mon 8/906:30LHR - ORD
1 stop14h 10mKLM
Wed 17/913:16ORD - LHR
1 stop11h 29mKLM
Deal found 10/6£413
Wed 10/908:40LHR - ORD
2 stops17h 43mDelta
Wed 1/1010:10ORD - LHR
1 stop14h 35mDelta
Deal found 11/6£414
Mon 8/908:40LHR - MDW
2 stops15h 57mDelta
Thu 18/910:35MDW - LHR
1 stop14h 10mDelta
Deal found 10/6£414
Wed 27/809:30LHR - ORD
1 stop14h 20mFinnair
Wed 10/922:35ORD - LHR
Nonstop7h 40mFinnair
Deal found 11/6£414
Thu 30/1006:40LHR - ORD
1 stop16h 05mScandinavian Airlines
Sun 2/1119:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 11/6£416
Thu 25/918:45LHR - ORD
1 stop27h 45mTAP AIR PORTUGAL
Sat 4/1018:15ORD - LHR
1 stop34h 05mTAP AIR PORTUGAL
Deal found 11/6£417
Tue 23/906:15LHR - MDW
2 stops16h 08mVirgin Atlantic
Thu 2/1010:35MDW - LHR
2 stops13h 45mVirgin Atlantic
Deal found 11/6£417
Tue 23/908:40LHR - ORD
1 stop11h 30mVirgin Atlantic
Fri 3/1018:10ORD - LHR
1 stop11h 15mVirgin Atlantic
Deal found 11/6£420

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 13 June 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

LTN - ORD

LTNORD

London Luton

Mon 15/9

12:50-16:10

2 stops33h 20m

Chicago O'Hare Intl

Mon 22/9

19:15-21:25

2 stops20h 10m

£411

LondonChicago

STN - ORD

STNORD

London Stansted

Mon 15/9

16:10-16:10

2 stops30h 00m

Chicago O'Hare Intl

Mon 22/9

19:15-22:10

2 stops20h 55m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

13:30-19:55

1 stop12h 25m

Chicago O'Hare Intl

Sat 20/9

22:30-17:40

1 stop13h 10m

£412

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 4/9

13:05-23:10

1 stop16h 05m

Chicago O'Hare Intl

Thu 11/9

20:12-06:20

1 stop28h 08m

£412

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 8/9

06:30-14:40

1 stop14h 10m

Chicago O'Hare Intl

Wed 17/9

13:16-06:45

1 stop11h 29m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

06:30-15:00

2 stops14h 30m

Chicago O'Hare Intl

Wed 17/9

09:30-06:45

1 stop15h 15m

£414

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Mon 8/9

08:40-18:37

2 stops15h 57m

Chicago Midway

Thu 18/9

10:35-06:45

1 stop14h 10m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 27/8

09:30-17:50

1 stop14h 20m

Chicago O'Hare Intl

Wed 10/9

22:35-12:15

Nonstop7h 40m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 30/10

06:40-17:45

1 stop16h 05m

Chicago O'Hare Intl

Sun 2/11

19:20-16:00

1 stop14h 40m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 25/9

18:45-16:30

1 stop27h 45m

Chicago O'Hare Intl

Sat 4/10

18:15-10:20

1 stop34h 05m

£417

Flights are sorted by cheapest return flights first.

Deals found on 10/6

Showing 1-10 of 60 results
1
2
3
...
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

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 13 June 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 13 June 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).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

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 13 June 2025.
To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and LOT. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,946 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very Good
7,946 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
LOT
7.6
Good
1,079 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
802 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,290 reviews
Delta
8.0
Very Good
7,946 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 £381. Users have also found prices from £386 and £400 on TAP AIR PORTUGAL and Scandinavian Airlines, respectively.

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

    While some choose either London Gatwick - Chicago O'Hare Intl or London City - 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 (92%), Austrian Airlines (92%), United Airlines( 92%).

  • What are the cheapest flights from London to Illinois?

    Looking for the cheapest flight from London to Illinois? While on average our users pay £1,784, our data indicates the cheapest price to be £373. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £325.

  • 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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
Heathrow to LaGuardia flights
London City to John F Kennedy Intl flights
Gatwick to Newark flights
Gatwick to John F Kennedy Intl flights
Gatwick to LaGuardia flights
London City to Newark flights
Heathrow to Los Angeles flights
Stansted to John F Kennedy Intl flights
Heathrow to Orlando flights
Heathrow to Boston flights
Heathrow to Miami flights
Luton to John F Kennedy Intl flights
Heathrow to Seattle flights
Heathrow to O'Hare Intl flights
Heathrow to San Francisco flights
Gatwick to Boston flights
Manchester to John F Kennedy Intl flights
Stansted to Stewart flights
Heathrow to Dulles Intl flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Las Vegas flights
London City to Los Angeles flights
Heathrow to Baltimore flights
Gatwick to Orlando flights
Manchester to Orlando flights
Heathrow to Atlanta flights
Heathrow to Hobby flights
Stansted to Newark flights
London City to Orlando flights
London City to Boston flights
Gatwick to Stewart flights
London City to Miami flights
London City to LaGuardia flights
Gatwick to Miami flights
Manchester to Newark flights
Gatwick to Los Angeles flights
Heathrow to Tampa flights
Gatwick to O'Hare Intl flights
Luton to Newark flights
Luton to Stewart flights
Manchester to LaGuardia flights
London City to O'Hare Intl flights
Heathrow to Raleigh flights
Edinburgh to Newark flights
Heathrow to Ontario flights
Heathrow to George Bush Intcntl flights
Gatwick to San Francisco flights
Heathrow to Santa Ana 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 13 June 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£310Average£484FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£350Average£496FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£363Average£599FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Virgin AtlanticCheapest£381Average£578FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£389Average£629FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Austrian AirlinesCheapest£397Average£560FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£397Average£569FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£398Average£566FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest£400Average£620FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£404Average£699FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights