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Cheap flights from the United Kingdom to Illinois from £230

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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
28 Apr — 5 May1
1 adult

Cheap flight deals from United Kingdom to Illinois

Keep the following information in mind while searching for United Kingdom to Illinois flight deals. Data was last updated 23 April 2025.

Round-trip from

£411

One-way from

£230

Popular in

August

Cheapest in

February

Average price

£502

Good round-trip deal

£538 or less

Good one-way deal

£533 or less
Austrian Airlines
  • Austrian Airlines
  • 5/5-12/5
  • 1 total stop
  • 24h 10m total
  • United Kingdom to Illinois
3/6
  • 3/6
  • 2 total stops
  • 24h 07m total
  • United Kingdom to Illinois
Highest demand for flights based on searches. 13% potential increase in price (£59 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Average for round-trip flights in April 2025
Price to beat on a round-trip flight from United Kingdom to Illinois.
Price to beat on a one-way flight from United Kingdom to Illinois.

Find flight deals from United Kingdom to Illinois

Cheapest flights from United Kingdom to Illinois
Explore the most affordable flight options available from United Kingdom to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 April 2025.

Mon 28/408:40LHR - ORD
1 stop13h 15mMultiple Airlines
Mon 5/518:05ORD - LHR
Nonstop8h 15mMultiple Airlines
Deal found 21/4£411
Sat 6/921:25LHR - ORD
1 stop29h 50mIcelandair
Mon 15/919:25ORD - LHR
1 stop10h 30mIcelandair
Deal found 22/4£412
Wed 7/506:50LHR - ORD
1 stop11h 10mLufthansa
Thu 22/521:31ORD - LHR
2 stops26h 24mLufthansa
Deal found 22/4£413
Wed 7/518:35LGW - ORD
1 stop27h 20mSWISS
Wed 14/515:45ORD - LGW
1 stop20h 10mSWISS
Deal found 22/4£414
Thu 8/513:45LHR - ORD
1 stop32h 10mUnited Airlines
Fri 16/518:05ORD - LHR
Nonstop8h 15mUnited Airlines
Deal found 22/4£415
Fri 2/515:05LGW - ORD
1 stop26h 00mBritish Airways
Thu 8/511:45ORD - LGW
1 stop14h 25mBritish Airways
Deal found 22/4£416
Wed 30/408:40LHR - ORD
2 stops19h 26mAir Canada
Sun 4/508:40ORD - LHR
1 stop15h 50mAir Canada
Deal found 23/4£418
Thu 1/516:40LHR - ORD
1 stop31h 46mAustrian Airlines
Sat 3/515:55ORD - LHR
1 stop37h 15mAustrian Airlines
Deal found 23/4£421
Wed 21/517:35LGW - ORD
2 stops33h 40mMultiple Airlines
Wed 28/519:25ORD - LGW
2 stops16h 25mMultiple Airlines
Deal found 21/4£421
Tue 29/413:10LHR - ORD
Nonstop8h 45mBritish Airways
Wed 7/520:30ORD - LHR
Nonstop8h 00mBritish Airways
Deal found 22/4£421
Wed 5/1111:55LGW - ORD
1 stop11h 25mIcelandair
Mon 10/1118:30ORD - LGW
1 stop10h 25mIcelandair
Deal found 22/4£422
Wed 21/522:00STN - ORD
2 stops29h 15mMultiple Airlines
Wed 28/519:25ORD - STN
2 stops14h 55mMultiple Airlines
Deal found 21/4£425

Cheapflights Fare Finder

Customise your flight search to find flights from United Kingdom 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 23 April 2025.
Use the filters below to find and compare flights from the United Kingdom to Illinois that are best for you.

Fly from

United Kingdom

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 5/5

06:00-15:55

1 stop15h 55m

Chicago O'Hare Intl

Mon 12/5

18:05-08:20

Nonstop8h 15m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

21:25-21:15

1 stop29h 50m

Chicago O'Hare Intl

Mon 15/9

19:25-11:55

1 stop10h 30m

£412

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 7/5

06:50-12:00

1 stop11h 10m

Chicago O'Hare Intl

Thu 22/5

21:31-05:55

2 stops26h 24m

£413

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 7/5

18:35-15:55

1 stop27h 20m

Chicago O'Hare Intl

Wed 14/5

15:45-17:55

1 stop20h 10m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 8/5

13:45-15:55

1 stop32h 10m

Chicago O'Hare Intl

Fri 16/5

18:05-08:20

Nonstop8h 15m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 8/9

20:05-15:55

1 stop25h 50m

Chicago O'Hare Intl

Tue 16/9

14:20-16:25

1 stop20h 05m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

13:10-15:55

Nonstop8h 45m

Chicago O'Hare Intl

Wed 17/9

22:35-12:15

Nonstop7h 40m

£421

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 21/5

17:35-21:15

2 stops33h 40m

Chicago O'Hare Intl

Wed 28/5

19:25-17:50

2 stops16h 25m

£421

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 9/9

13:00-18:15

1 stop11h 15m

Chicago O'Hare Intl

Wed 17/9

19:25-14:40

1 stop13h 15m

£424

LondonChicago

STN - ORD

STNORD

London Stansted

Wed 21/5

22:00-21:15

2 stops29h 15m

Chicago O'Hare Intl

Wed 28/5

19:25-16:20

2 stops14h 55m

£425

Flights are sorted by cheapest return flights first.

Deals found on 22/4

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

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

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

Currently, January is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £595). Flying from United Kingdom 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 GB to IL?

Find hourly flight availability from United Kingdom 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 23 April 2025.

When flying from United Kingdom 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 United Kingdom to Illinois

Explore weekly flight availability from United Kingdom 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 23 April 2025.

The most flights from GB0 to USIL are scheduled on a Monday (56 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (44 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 23 April 2025.
To help decide which airline to fly from United Kingdom to Illinois, see what other customers have to say about Delta, KLM and LOT. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 United Kingdom to Illinois one-way?

    £377 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on WestJet and Aer Lingus, with prices starting from £387 and £388, respectively.

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

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

  • How can I find direct flights from United Kingdom to Illinois?

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

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

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Illinois?

    Currently, January is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £595). Flying from United Kingdom 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 United Kingdom to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from United Kingdom to Illinois

Discover the top 10 airlines that operate flights from United Kingdom 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 23 April 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£314Average£554FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£329Average£598FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air FranceCheapest£339Average£468FlexibilityNo cancel feeOn-time77%
Search Air France flights
Scandinavian AirlinesCheapest£356Average£496FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£369Average£600FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£380Average£712FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£408Average£553FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£410Average£614FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£415Average£593FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£416Average£645FlexibilityNo cancel feeOn-time76%
Search Lufthansa 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 United Kingdom 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 United Kingdom today with Cheapflights!

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Illinois from United Kingdom.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from United Kingdom to Illinois, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from United Kingdom to Illinois become cheaper?

Yes, Cheapflights offers price alerts on United Kingdom to Illinois 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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