Cheap flights from the United Kingdom to Illinois from £243

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
3 Sep — 10 Sep1
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 29 August 2025.

Round-trip from

£420

One-way from

£243

Popular in

July

Cheapest in

February

Average price

£622

Good round-trip deal

£495 or less

Good one-way deal

£553 or less
Icelandair
  • Icelandair
  • 13/10-20/10
  • 2 total stops
  • 45h 45m total
  • United Kingdom to Illinois
22/10
  • 22/10
  • 2 total stops
  • 24h 45m total
  • United Kingdom to Illinois
Highest demand for flights based on searches. 13% potential increase in price (£61 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Average for round-trip flights in August 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 29 August 2025.

Thu 25/908:45LCY - ORD
2 stops20h 30mMultiple Airlines
Sat 4/1017:55ORD - LCY
2 stops17h 20mMultiple Airlines
Deal found 28/8£420
Sat 6/907:25LHR - ORD
1 stop12h 40mUnited Airlines
Mon 15/913:12ORD - LHR
1 stop10h 43mUnited Airlines
Deal found 27/8£420
Wed 17/914:00LGW - ORD
1 stop32h 12mMultiple Airlines
Wed 1/1007:20ORD - LGW
2 stops20h 40mMultiple Airlines
Deal found 28/8£420
Wed 29/1009:25LCY - ORD
1 stop12h 55mSWISS
Wed 5/1118:50ORD - LCY
1 stop12h 00mSWISS
Deal found 28/8£420
Thu 11/907:40LHR - ORD
1 stop14h 05mAmerican Airlines
Mon 15/920:40ORD - LHR
Nonstop7h 50mAmerican Airlines
Deal found 28/8£420
Sun 14/914:00LGW - MDW
2 stops23h 11mMultiple Airlines
Mon 6/1008:15MDW - LGW
2 stops19h 45mMultiple Airlines
Deal found 27/8£421
Sat 30/810:00LGW - ORD
2 stops19h 33mMultiple Airlines
Sun 5/1020:49ORD - LGW
1 stop31h 11mMultiple Airlines
Deal found 26/8£421
Thu 4/907:40LHR - ORD
1 stop14h 05mAmerican Airlines
Mon 15/917:40ORD - LHR
Nonstop7h 40mAmerican Airlines
Deal found 27/8£421
Sat 6/908:50LGW - ORD
1 stop16h 10mMultiple Airlines
Mon 15/921:15ORD - LGW
1 stop15h 20mMultiple Airlines
Deal found 28/8£422
Sun 7/907:30LHR - ORD
1 stop13h 25mUnited Airlines
Sat 27/916:00ORD - LHR
Nonstop8h 20mUnited Airlines
Deal found 27/8£422
Sat 22/1106:30LHR - MDW
2 stops17h 48mVirgin Atlantic
Sat 6/1210:35MDW - LHR
1 stop15h 15mVirgin Atlantic
Deal found 27/8£422
Fri 5/910:00LGW - MDW
2 stops19h 20mMultiple Airlines
Mon 29/908:19MDW - LGW
1 stop19h 41mMultiple Airlines
Deal found 27/8£423

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 29 August 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

LCY - ORD

LCYORD

London City

Thu 25/9

08:45-23:15

2 stops20h 30m

Chicago O'Hare Intl

Sat 4/10

17:55-17:15

2 stops17h 20m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 8/9

06:00-13:20

1 stop13h 20m

Chicago O'Hare Intl

Wed 24/9

21:50-11:45

Nonstop7h 55m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 13/9

07:25-14:05

1 stop12h 40m

Chicago O'Hare Intl

Thu 18/9

18:00-08:20

Nonstop8h 20m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 7/11

06:35-14:10

1 stop13h 35m

Chicago O'Hare Intl

Fri 28/11

17:50-07:55

Nonstop8h 05m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

07:25-14:05

1 stop12h 40m

Chicago O'Hare Intl

Mon 15/9

13:12-05:55

1 stop10h 43m

£420

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 17/9

14:00-16:12

1 stop32h 12m

Chicago O'Hare Intl

Wed 1/10

07:20-10:00

2 stops20h 40m

£420

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 8/9

10:00-23:20

2 stops19h 20m

Chicago O'Hare Intl

Thu 25/9

10:27-07:00

1 stop14h 33m

£420

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 21/10

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Tue 28/10

19:30-10:55

1 stop10h 25m

£421

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 6/10

06:30-16:11

2 stops15h 41m

Chicago O'Hare Intl

Mon 13/10

20:38-13:10

1 stop10h 32m

£421

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Sun 14/9

14:00-07:11

2 stops23h 11m

Chicago Midway

Mon 6/10

08:15-10:00

2 stops19h 45m

£421

Flights are sorted by cheapest return flights first.

Deals found on 28/8

Showing 1-10 of 60 results
1
2
3
...
6

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 29 August 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 29 August 2025.

The most flights from GB0 to USIL are scheduled on a Wednesday (53 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (39 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 29 August 2025.
Read through reviews of airlines operating flights from the United Kingdom to Illinois, such as Finnair, Aer Lingus, andIcelandair. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

7.6

Comfort

7.5

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Comfort

7.5

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Comfort

7.5

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Comfort

7.5

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Comfort

7.5

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Boarding

7.6

Comfort

7.5

Overall

7.6

Crew

8.1

Food

6.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

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.
  • How long is the flight from United Kingdom to Illinois?

    A quick flight from United Kingdom to Illinois can take about 12h 40m. Austrian Airlines provides one of the quickest options available for as low as £420. The distance between United Kingdom and Illinois is about 3939 mi. Both multi-stop and direct flights can be found to your destination and back.

  • 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 TAP AIR PORTUGAL and Lufthansa, with prices starting from £406 and £407, 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 29 August 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£310Average£551FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£325Average£644FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air FranceCheapest£335Average£565FlexibilityNo cancel feeOn-time77%
Search Air France flights
Scandinavian AirlinesCheapest£352Average£463FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£366Average£611FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£376Average£551FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£379Average£600FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£392Average£575FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£395Average£620FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£401Average£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.

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.