Cheap flights from the United Kingdom to Illinois from £266
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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
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 13 June 2025.
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 13 June 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 13 June 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 13 June 2025.
Use the filters below to find and compare flights from the United Kingdom to Illinois that are best for you.
Fly from
Fly to
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
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
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
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
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
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
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
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
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
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
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.
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 13 June 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 13 June 2025.
The most flights from GB0 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 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.
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
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 13 June 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.