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Cheap flights from the United Kingdom to Illinois from £224
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 22/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
16 Nov — 23 Nov1
Find flight deals from United Kingdom to Illinois
Cheapest flights from United Kingdom to IllinoisExplore 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 17 October 2025.
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 17 October 2025.
Wed 19/1108:50LGW - ORD
2 stops14h 30mMultiple Airlines
Fri 5/1218:30ORD - LGW
2 stops18h 00mMultiple Airlines
Deal found 16/10£395
Wed 19/1106:50LTN - ORD
2 stops16h 30mMultiple Airlines
Fri 5/1218:30ORD - LTN
2 stops15h 45mMultiple Airlines
Deal found 16/10£395
Wed 19/1108:30STN - ORD
2 stops14h 50mMultiple Airlines
Fri 5/1218:30ORD - STN
2 stops16h 05mMultiple Airlines
Deal found 16/10£395
Sat 6/1214:00LGW - ORD
2 stops56h 54mMultiple Airlines
Sat 13/1212:09ORD - LGW
1 stop15h 56mMultiple Airlines
Deal found 15/10£397
Wed 12/1119:30LHR - ORD
1 stop27h 15mScandinavian Airlines
Wed 19/1119:20ORD - LHR
1 stop16h 20mScandinavian Airlines
Deal found 15/10£397
Mon 17/1108:30STN - ORD
2 stops14h 50mMultiple Airlines
Mon 1/1218:30ORD - STN
2 stops13h 50mMultiple Airlines
Deal found 16/10£397
Tue 18/1119:50LHR - ORD
2 stops26h 55mScandinavian Airlines
Thu 27/1119:20ORD - LHR
1 stop16h 20mScandinavian Airlines
Deal found 15/10£398
Sat 6/1206:30STN - ORD
2 stops16h 50mMultiple Airlines
Tue 9/1218:30ORD - STN
2 stops13h 50mMultiple Airlines
Deal found 16/10£398
Fri 31/1010:20LHR - ORD
1 stop12h 25mScandinavian Airlines
Fri 7/1119:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 16/10£398
Mon 3/1107:05LHR - ORD
2 stops15h 40mScandinavian Airlines
Sat 8/1119:20ORD - LHR
1 stop20h 20mScandinavian Airlines
Deal found 15/10£400
Fri 7/1115:15STN - ORD
3 stops31h 30mMultiple Airlines
Sun 16/1119:20ORD - STN
2 stops21h 40mMultiple Airlines
Deal found 16/10£400
Thu 6/1114:00LGW - ORD
1 stop28h 26mMultiple Airlines
Mon 17/1106:40ORD - LGW
1 stop17h 20mMultiple Airlines
Deal found 16/10£401
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 17 October 2025.
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 17 October 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
STN - ORD
STNORD
London Stansted
Fri 7/11
15:15-16:45
3 stops31h 30m
Chicago O'Hare Intl
Sun 16/11
19:20-23:00
2 stops21h 40m
£400
LondonChicago
LTN - ORD
LTNORD
London Luton
Fri 7/11
13:05-16:45
3 stops33h 40m
Chicago O'Hare Intl
Sun 16/11
19:20-22:00
2 stops20h 40m
£403
LondonChicago
LGW - ORD
LGWORD
London Gatwick
Thu 8/1
14:00-17:04
1 stop33h 04m
Chicago O'Hare Intl
Fri 23/1
06:05-10:00
1 stop21h 55m
£406
LondonChicago
STN - ORD
STNORD
London Stansted
Thu 20/11
16:30-16:45
2 stops30h 15m
Chicago O'Hare Intl
Sun 23/11
19:20-23:00
2 stops21h 40m
£407
LondonChicago
LHR - ORD
LHRORD
London Heathrow
Wed 12/11
19:30-16:45
1 stop27h 15m
Chicago O'Hare Intl
Sat 22/11
19:20-18:30
1 stop17h 10m
£409
LondonChicago
LHR - ORD
LHRORD
London Heathrow
Thu 6/11
18:40-16:45
1 stop28h 05m
Chicago O'Hare Intl
Thu 13/11
19:20-21:40
1 stop20h 20m
£409
LondonChicago
LHR - ORD
LHRORD
London Heathrow
Wed 12/11
19:30-16:45
1 stop27h 15m
Chicago O'Hare Intl
Sun 23/11
19:20-16:00
1 stop14h 40m
£409
LondonChicago
LHR - ORD
LHRORD
London Heathrow
Wed 12/11
18:40-16:45
1 stop28h 05m
Chicago O'Hare Intl
Wed 26/11
19:20-16:00
1 stop14h 40m
£409
LondonChicago
LHR - ORD
LHRORD
London Heathrow
Fri 14/11
10:20-16:45
1 stop12h 25m
Chicago O'Hare Intl
Fri 28/11
19:20-16:00
1 stop14h 40m
£409
LondonChicago
LHR - ORD
LHRORD
London Heathrow
Mon 17/11
06:40-16:45
1 stop16h 05m
Chicago O'Hare Intl
Mon 24/11
19:20-18:30
1 stop17h 10m
£409
Showing 1-10 of 60 results
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, September is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £152). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £466). 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 17 October 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 14% on flights from United Kingdom to Illinois by exploring options for tickets at midday.
What is the cheapest day to fly from United Kingdom to Illinois?
Use this chart to determine the cheapest time to fly return from United Kingdom to Illinois. Price data was last updated on 16 December 2024.
Travellers seeking maximum savings on their United Kingdom to Illinois flight should consider departing on Thursday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 17 October 2025.
The most flights from GB0 to USIL are scheduled on a Monday (47 on average). You will have fewer flight options on Monday, 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 17 October 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
7.4
Entertainment
6.9
Crew
8.1
Food
6.7
Overall
7.6
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2025
FRA - DFW
Boarding
7.6
Comfort
7.4
Entertainment
6.9
Crew
8.1
Food
6.7
Overall
7.6
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2025
FRA - DFW
Boarding
7.6
Comfort
7.4
Entertainment
6.9
Crew
8.1
Food
6.7
Overall
7.6
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2025
FRA - DFW
Boarding
7.6
Comfort
7.4
Entertainment
6.9
Crew
8.1
Food
6.7
Overall
7.6
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2025
FRA - DFW
Boarding
7.6
Comfort
7.4
Entertainment
6.9
Crew
8.1
Food
6.7
Overall
7.6
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2025
FRA - DFW
Boarding
7.6
Comfort
7.4
Entertainment
6.9
Crew
8.1
Food
6.7
Overall
7.6
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2025
FRA - DFW
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.
Browse thousands of different options on Cheapflights for your next trip
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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 17 October 2025.
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.