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Cheap flights from the United Kingdom to Illinois from £198

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 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
20 Jul — 27 Jul1
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 15 July 2025.

Round-trip from

£412

One-way from

£232

Popular in

July

Cheapest in

February

Average price

£654

Good round-trip deal

£545 or less

Good one-way deal

£605 or less
Lufthansa
  • Lufthansa
  • 10/9-18/9
  • 1 total stop
  • 20h 45m total
  • United Kingdom to Illinois
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22/8
  • 22/8
  • 2 total stops
  • 33h 45m total
  • United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£65 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 July 2025
Search Deals
Price to beat on a round-trip flight from United Kingdom to Illinois.
Search Deals
Price to beat on a one-way flight from United Kingdom to Illinois.
Search Deals

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 15 July 2025.

Wed 10/908:30LHR - ORD
1 stop12h 25mLufthansa
Thu 18/918:00ORD - LHR
Nonstop8h 20mLufthansa
Deal found 14/7£412
Thu 28/819:50LHR - ORD
1 stop26h 20mTAP AIR PORTUGAL
Thu 4/918:00ORD - LHR
1 stop22h 05mTAP AIR PORTUGAL
Deal found 14/7£412
Tue 2/915:40LGW - ORD
1 stop11h 35mIcelandair
Thu 9/1019:25ORD - LGW
1 stop13h 15mIcelandair
Deal found 13/7£413
Thu 28/812:35LTN - ORD
2 stops33h 35mMultiple Airlines
Thu 4/919:15ORD - LTN
2 stops19h 25mMultiple Airlines
Deal found 14/7£413
Thu 16/1011:55LHR - ORD
1 stop14h 55mJetBlue
Mon 20/1013:36ORD - LHR
1 stop13h 54mJetBlue
Deal found 13/7£414
Sat 30/814:00LGW - ORD
1 stop14h 22mMultiple Airlines
Thu 11/912:05ORD - LGW
1 stop15h 55mMultiple Airlines
Deal found 12/7£414
Mon 25/821:25LHR - ORD
1 stop26h 50mIcelandair
Sat 13/1218:30ORD - LHR
1 stop10h 20mIcelandair
Deal found 14/7£414
Tue 16/918:35LGW - ORD
1 stop27h 20mSWISS
Mon 13/1015:45ORD - LGW
1 stop20h 05mSWISS
Deal found 12/7£417
Fri 12/915:05LGW - ORD
1 stop27h 36mBritish Airways
Fri 10/1013:43ORD - LGW
1 stop12h 27mBritish Airways
Deal found 12/7£418
Sun 24/807:30LHR - ORD
1 stop18h 25mUnited Airlines
Tue 9/916:00ORD - LHR
Nonstop8h 20mUnited Airlines
Deal found 14/7£418
Wed 10/908:40LHR - ORD
1 stop13h 15mMultiple Airlines
Sun 21/918:00ORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 14/7£419
Sun 7/919:30LHR - ORD
1 stop23h 50mAustrian Airlines
Sat 20/912:50ORD - LHR
1 stop12h 05mAustrian Airlines
Deal found 13/7£421

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 15 July 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

Wed 10/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Thu 18/9

18:00-08:20

Nonstop8h 20m

£412

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 28/8

19:50-16:10

1 stop26h 20m

Chicago O'Hare Intl

Thu 4/9

18:00-22:05

1 stop22h 05m

£412

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 2/9

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Thu 9/10

19:25-14:40

1 stop13h 15m

£413

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 28/8

12:35-16:10

2 stops33h 35m

Chicago O'Hare Intl

Thu 4/9

19:15-20:40

2 stops19h 25m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 16/10

11:55-20:50

1 stop14h 55m

Chicago O'Hare Intl

Mon 20/10

13:36-09:30

1 stop13h 54m

£414

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 30/8

14:00-22:22

1 stop14h 22m

Chicago O'Hare Intl

Thu 11/9

12:05-10:00

1 stop15h 55m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 25/8

21:25-18:15

1 stop26h 50m

Chicago O'Hare Intl

Sat 13/12

18:30-10:50

1 stop10h 20m

£414

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 16/9

18:35-15:55

1 stop27h 20m

Chicago O'Hare Intl

Mon 13/10

15:45-17:50

1 stop20h 05m

£417

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 12/9

15:05-12:41

1 stop27h 36m

Chicago O'Hare Intl

Fri 10/10

13:43-08:10

1 stop12h 27m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 24/8

07:30-19:55

1 stop18h 25m

Chicago O'Hare Intl

Tue 9/9

16:00-06:20

Nonstop8h 20m

£418

Flights are sorted by cheapest return flights first.

Deals found on 12/7

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 15 July 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 15 July 2025.

The most flights from GB0 to USIL are scheduled on a Saturday (54 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (47 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 15 July 2025.
Read through reviews of airlines operating flights from the United Kingdom to Illinois, such as Delta, KLM, andAir Transat. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,956 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Transat
7.8
Good
414 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
814 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,466 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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?

    £406 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on Icelandair and JetBlue, with prices starting from £408 and £412, 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.
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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 15 July 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£311Average£556FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£326Average£639FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air FranceCheapest£336Average£567FlexibilityNo cancel feeOn-time77%
Search Air France flights
Scandinavian AirlinesCheapest£353Average£488FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£367Average£615FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£378Average£550FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£381Average£604FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£393Average£590FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£397Average£619FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£403Average£580FlexibilityNo 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 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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