Cheap flights from London Heathrow Airport to Illinois from £362
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
7 Nov — 14 Nov1
Cheap flight deals from Heathrow to Illinois
Enter your travel dates to find the best prices.
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Cheapest flights from Heathrow to IllinoisExplore the most affordable flight options available from Heathrow to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 October 2026.
Explore the most affordable flight options available from Heathrow to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 October 2026.
Thu 19/1110:20 -
1 stop12h 25m
Thu 26/1119:10 -
2 stops17h 40m
Deal found 5/10£535
Mon 23/1107:05 -
2 stops15h 40m
Mon 7/1219:10 -
1 stop20h 30m
Deal found 3/10£536
Mon 2/1120:35 -
1 stop26h 45m
Thu 19/1118:30 -
1 stop19h 00m
Deal found 3/10£537
Wed 28/1020:35 -
1 stop26h 45m
Mon 2/1118:30 -
1 stop19h 00m
Deal found 4/10£537
Fri 25/1206:40 -
1 stop16h 05m
Mon 28/1219:10 -
1 stop14h 50m
Deal found 6/10£539
Thu 12/1119:50 -
2 stops26h 55m
Mon 16/1119:10 -
2 stops20h 10m
Deal found 3/10£540
Thu 19/1107:05 -
2 stops15h 40m
Mon 14/1219:10 -
2 stops15h 50m
Deal found 7/10£542
Thu 17/1212:15 -
1 stop11h 05m
Sun 10/118:30 -
1 stop19h 00m
Deal found 3/10£543
Mon 9/1117:00 -
1 stop29h 45m
Mon 23/1119:10 -
2 stops15h 15m
Deal found 7/10£544
Wed 4/1110:50 -
1 stop12h 57m
Wed 11/1106:08 -
1 stop18h 17m
Deal found 7/10£551
Fri 13/1110:50 -
1 stop12h 57m
Sun 15/1106:08 -
1 stop18h 17m
Deal found 6/10£554
Wed 4/1110:50 -
1 stop18h 57m
Tue 10/1106:08 -
1 stop18h 17m
Deal found 7/10£562
Best flights from Heathrow to IllinoisDiscover carefully curated flight deals from Heathrow to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 October 2026.
Discover carefully curated flight deals from Heathrow to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 October 2026.
Sat 12/1215:35 -
2 stops31h 10m
Thu 31/1219:10 -
1 stop14h 50m
Deal found 4/10£536
Mon 2/1111:00 -
Nonstop8h 45m
Mon 16/1118:35 -
Nonstop8h 00m
Deal found 5/10£648
Thu 19/1109:00 -
1 stop13h 15m
Thu 26/1118:50 -
1 stop31h 15m
Deal found 5/10£648
Fri 20/1106:00 -
1 stop14h 00m
Mon 30/1117:45 -
Nonstop8h 10m
Deal found 3/10£652
Mon 16/1106:30 -
2 stops16h 35m
Mon 21/1207:05 -
1 stop20h 50m
Deal found 3/10£656
Mon 9/1109:40 -
2 stops19h 14m
Mon 23/1109:30 -
2 stops14h 55m
Deal found 6/10£670
Wed 18/1106:15 -
2 stops23h 55m
Wed 25/1115:01 -
1 stop14h 34m
Deal found 3/10£818
Thu 24/1219:50 -
2 stops26h 55m
Thu 31/1219:10 -
1 stop14h 50m
Deal found 4/10£553
Wed 21/1007:05 -
2 stops15h 05m
Wed 18/1119:10 -
1 stop16h 30m
Deal found 4/10£571
Tue 3/1110:00 -
2 stops18h 33m
Tue 10/1117:13 -
1 stop12h 27m
Deal found 6/10£656
Tue 10/1109:50 -
1 stop12h 49m
Tue 17/1111:27 -
1 stop12h 58m
Deal found 7/10£671
Thu 5/1109:00 -
1 stop13h 15m
Sun 22/1121:50 -
Nonstop8h 10m
Deal found 7/10£680
Tue 10/1106:30 -
2 stops17h 34m
Tue 17/1113:05 -
1 stop11h 20m
Deal found 7/10£656
Tue 20/1019:30 -
1 stop26h 40m
Tue 17/1119:10 -
1 stop16h 30m
Deal found 6/10£601
Mon 2/1111:20 -
2 stops17h 13m
Mon 16/1113:05 -
2 stops12h 40m
Deal found 5/10£671
Tue 3/1107:30 -
2 stops22h 40m
Tue 10/1115:20 -
1 stop11h 15m
Deal found 6/10£801
Wed 21/1006:40 -
1 stop15h 30m
Wed 11/1119:10 -
2 stops15h 15m
Deal found 4/10£606
Mon 9/1111:20 -
1 stop12h 44m
Mon 23/1113:31 -
1 stop11h 34m
Deal found 7/10£672
Thu 19/1108:40 -
2 stops15h 24m
Thu 26/1112:05 -
2 stops13h 45m
Deal found 5/10£687
Tue 17/1115:40 -
1 stop25h 10m
Tue 24/1105:46 -
1 stop19h 09m
Deal found 3/10£833
Tue 17/1109:00 -
2 stops18h 22m
Tue 24/1114:31 -
2 stops16h 29m
Deal found 3/10£801
Wed 18/1106:15 -
2 stops23h 55m
Wed 25/1115:01 -
2 stops17h 54m
Deal found 3/10£828
Tue 3/1106:30 -
2 stops17h 30m
Sun 8/1109:29 -
1 stop16h 16m
Deal found 6/10£686
Wed 21/1018:40 -
1 stop27h 30m
Sat 24/1019:15 -
1 stop18h 15m
Deal found 7/10£646
Thu 19/1111:00 -
1 stop19h 13m
Thu 26/1105:12 -
1 stop19h 43m
Deal found 5/10£863
Tue 3/1109:00 -
2 stops18h 13m
Tue 10/1114:35 -
2 stops16h 25m
Deal found 6/10£801
Thu 5/1108:40 -
2 stops15h 20m
Mon 9/1111:27 -
1 stop14h 23m
Deal found 3/10£686
Wed 11/1106:15 -
2 stops23h 55m
Sun 15/1115:11 -
1 stop11h 24m
Deal found 5/10£872
Wed 18/1109:00 -
2 stops18h 13m
Wed 25/1110:43 -
2 stops14h 57m
Deal found 3/10£804
Mon 14/1206:40 -
1 stop16h 05m
Fri 1/119:10 -
2 stops32h 25m
Deal found 7/10£681
Direct flights from Heathrow to IllinoisExplore direct flight options from Heathrow to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 October 2026.
Explore direct flight options from Heathrow to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 October 2026.
Mon 9/1112:35 -
Nonstop8h 55m
Mon 23/1121:50 -
Nonstop7h 45m
Deal found 6/10£604
Mon 2/1111:00 -
Nonstop8h 45m
Mon 16/1118:35 -
Nonstop8h 00m
Deal found 4/10£605
Tue 3/1110:25 -
Nonstop9h 20m
Tue 10/1115:45 -
Nonstop8h 10m
Deal found 3/10£612
Thu 5/1107:40 -
Nonstop9h 05m
Thu 12/1121:50 -
Nonstop8h 10m
Deal found 5/10£612
Mon 9/1113:35 -
Nonstop9h 20m
Mon 23/1115:45 -
Nonstop8h 10m
Deal found 5/10£618
Mon 9/1107:50 -
Nonstop9h 05m
Mon 23/1117:45 -
Nonstop8h 10m
Deal found 7/10£619
Wed 4/1116:30 -
Nonstop9h 00m
Wed 11/1120:30 -
Nonstop7h 55m
Deal found 7/10£621
Wed 2/1210:25 -
Nonstop9h 20m
Wed 9/1215:45 -
Nonstop8h 10m
Deal found 3/10£624
Mon 2/1116:30 -
Nonstop9h 00m
Mon 9/1118:35 -
Nonstop8h 00m
Deal found 5/10£624
Tue 24/1112:35 -
Nonstop8h 55m
Tue 1/1218:30 -
Nonstop8h 05m
Deal found 7/10£625
Wed 18/1116:30 -
Nonstop9h 00m
Mon 30/1118:30 -
Nonstop8h 05m
Deal found 7/10£626
Last-minute flights from Heathrow to IllinoisDiscover last-minute flight deals from Heathrow to Illinois. Data last updated 8 October 2026 and is based on user searches.
Discover last-minute flight deals from Heathrow to Illinois. Data last updated 8 October 2026 and is based on user searches.
Wed 28/1020:35 -
1 stop26h 45m
Mon 2/1118:30 -
1 stop19h 00m
Deal found 4/10£537
Wed 28/1007:05 -
2 stops15h 40m
Mon 9/1119:10 -
2 stops20h 10m
Deal found 5/10£539
Mon 2/1120:35 -
1 stop26h 45m
Thu 19/1118:30 -
1 stop19h 00m
Deal found 3/10£537
Mon 2/1120:25 -
2 stops27h 22m
Mon 16/1106:08 -
1 stop18h 17m
Deal found 5/10£563
Wed 4/1110:50 -
1 stop12h 57m
Wed 11/1106:08 -
1 stop18h 17m
Deal found 7/10£551
Wed 4/1110:50 -
1 stop18h 57m
Tue 10/1106:08 -
1 stop18h 17m
Deal found 7/10£562
Mon 9/1117:00 -
1 stop29h 45m
Mon 23/1119:10 -
2 stops15h 15m
Deal found 7/10£544
Thu 12/1119:50 -
2 stops26h 55m
Mon 16/1119:10 -
2 stops20h 10m
Deal found 3/10£540
Fri 13/1110:50 -
1 stop12h 57m
Sun 15/1106:08 -
1 stop18h 17m
Deal found 6/10£554
Thu 19/1110:20 -
1 stop12h 25m
Thu 26/1119:10 -
2 stops17h 40m
Deal found 5/10£535
Thu 19/1107:05 -
2 stops15h 40m
Mon 14/1219:10 -
2 stops15h 50m
Deal found 7/10£542
Mon 23/1107:05 -
2 stops15h 40m
Mon 7/1219:10 -
1 stop20h 30m
Deal found 3/10£536
One-way flights from Heathrow to IllinoisSearch for one-way flight options from Heathrow to Illinois. Find affordable one-way fares based on user searches. Data last updated 8 October 2026.
Search for one-way flight options from Heathrow to Illinois. Find affordable one-way fares based on user searches. Data last updated 8 October 2026.
Sat 21/1115:30 -
3 stops30h 00m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 5/10£362
Tue 8/1219:30 -
2 stops28h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 6/10£363
Thu 5/1115:30 -
3 stops30h 00m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/10£364
Wed 2/1212:15 -
1 stop11h 05m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/10£364
Thu 12/1106:40 -
2 stops16h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/10£365
Tue 1/1220:35 -
1 stop26h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 5/10£366
Wed 9/1207:50 -
2 stops15h 30m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 4/10£367
Fri 6/1106:40 -
2 stops16h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/10£367
Thu 10/1214:15 -
3 stops30h 30m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/10£369
Sun 6/1220:50 -
3 stops27h 30m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 4/10£370
Sat 5/1212:15 -
3 stops32h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 7/10£418
Tue 24/1111:20 -
1 stop12h 44m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 5/10£420
Find flight deals from Heathrow to Illinois
Keep the following information in mind while searching for Heathrow to Illinois flight deals. Data was last updated 8 October 2026.
Cheapflights Fare Finder
Customise your flight search to find flights from Heathrow 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 7,457,451 searches. Data last updated 8 October 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest return flight
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Fri 4/12
20:35-17:20
1 stop26h 45m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£404
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Wed 6/1
20:35-17:20
1 stop26h 45m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£406
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Wed 9/12
07:40-10:45
Nonstop9h 05m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£423
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Mon 7/12
10:25-13:45
Nonstop9h 20m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£423
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Wed 2/12
10:25-13:45
Nonstop9h 20m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£424
LondonChicago
LHR London Heathrow - MDW Chicago Midway
LHRMDW
London Heathrow
Mon 1/3
10:00-22:10
2 stops18h 10m
Chicago Midway
Wed 31/12
00:00-07:00
Nonstop0h 00m
£435
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Sun 8/11
09:20-19:17
1 stop15h 57m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£451
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Fri 4/12
10:25-13:45
Nonstop9h 20m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£466
LondonChicago
LHR London Heathrow - MDW Chicago Midway
LHRMDW
London Heathrow
Sat 9/1
06:30-16:50
2 stops16h 20m
Chicago Midway
Wed 31/12
00:00-07:00
Nonstop0h 00m
£477
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Wed 4/11
06:00-15:30
1 stop15h 30m
Chicago O'Hare Intl
Wed 31/12
00:00-07:00
Nonstop0h 00m
£484
Showing 1-10 of 54 resultsSorted by cheapest first
Best time to book a flight from Heathrow to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Heathrow with our price prediction graph.
LHR-ORD
LHR-MDW
LHR-SPI
LHR-MLI
LHR-PIA
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 London Heathrow Airport to Illinois
LHR-USIL
LHR-ORD
LHR-MDW
LHR-SPI
LHR-MLI
What is the cheapest month to book a flight from London Heathrow Airport to Illinois?
Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of £508). Flying from London Heathrow Airport to Illinois in August is currently the most expensive (average of £838). 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 LHR to IL?
Find hourly flight availability from Heathrow 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 8 October 2026.
When flying from London Heathrow Airport 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 London Heathrow Airport to Illinois
Explore weekly flight availability from Heathrow 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 8 October 2026.
The most flights from LHR to USIL are scheduled on a Wednesday (50 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (41 on average).
How much does it cost for a return flight from London Heathrow Airport to Illinois?
Airfare is below average for this route at the moment.
London Heathrow Airport to Illinois flights typically cost between £604 and £793 in January.The cheapest return price found within the last 5 days was £535 on Icelandair (22 Jan–31 Jan).
How far ahead should I book a flight from London Heathrow Airport to Illinois?
The price you pay for your flight from London Heathrow Airport to Illinois may vary depending on when you book. For the best chance of a lower fare, look to book 79 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
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 8 October 2026.
Read through reviews of airlines operating flights from London Heathrow Airport to Illinois, such as United Airlines,Aer Lingus, andIcelandair. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.4
Food
6.7
Crew
8.1
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Overall
7.4
Food
6.7
Crew
8.1
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Overall
7.4
Food
6.7
Crew
8.1
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Overall
7.4
Food
6.7
Crew
8.1
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Overall
7.4
Food
6.7
Crew
8.1
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Overall
7.4
Food
6.7
Crew
8.1
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Related info for your journey
Find useful and relevant information for your journey from Heathrow to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Heathrow to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car hire and/or hotel booking to your travel itinerary.
Direct flights to United States
Book a non-stop flight to one of these other cities located in United States.
Search flights from Heathrow to Illinois by cabin class
Find flights from Heathrow to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Heathrow and Illinois flights
Browse other Heathrow and Illinois flight options. Last updated on 8 October 2026.
Popular flight searches
Check out other popular destinations found by fellow travellers in 2026
Heathrow to Illinois flights
Consider these flights travelling from Heathrow to Illinois.
Top 10 airlines flying from Heathrow to Illinois
Discover the top 10 airlines that operate flights from Heathrow 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 7,457,451 searches. Data last updated 8 October 2026.
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 Heathrow to Illinois?
Cheapflights helps you search for flights from Heathrow to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to Illinois?
Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Heathrow to Illinois for you. Better yet — we are completely free to use.
Can Cheapflights find flights from Heathrow to Illinois with no change fees?
Yes! Cheapflights helps users easily find flights from Heathrow to Illinois with no change fees.
Can Cheapflights notify me if prices for flights from Heathrow to Illinois become cheaper?
Of course! You can now track prices for flights from Heathrow to Illinois and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.