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Cheap flights from the United Kingdom to Illinois from £223

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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
6 Apr — 13 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Illinois

Enter your travel dates to find the best prices.

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 7 March 2026.

Tue 26/513:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Thu 2/719:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 2/3£415
Tue 21/416:25
LGW
-
ORD
1 stop29h 35m
TAP AIR PORTUGAL
Sun 26/418:00
ORD
-
LGW
1 stop33h 45m
TAP AIR PORTUGAL
Deal found 2/3£417
Thu 29/1015:35
LHR
-
ORD
2 stops31h 10m
Scandinavian Airlines
Mon 2/1119:20
ORD
-
LHR
2 stops39h 05m
Scandinavian Airlines
Deal found 3/3£417
Wed 27/515:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Fri 3/719:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 2/3£419
Tue 26/513:00
LGW
-
ORD
1 stop11h 15m
Icelandair
Fri 3/722:25
ORD
-
LGW
1 stop10h 15m
Icelandair
Deal found 2/3£420
Tue 17/307:25
LHR
-
ORD
1 stop20h 31m
JetBlue
Tue 24/311:00
ORD
-
LHR
1 stop14h 55m
JetBlue
Deal found 3/3£420
Fri 17/406:00
BHX
-
ORD
2 stops18h 15m
Multiple Airlines
Fri 24/422:25
ORD
-
BHX
2 stops20h 30m
Multiple Airlines
Deal found 4/3£420
Mon 25/515:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Tue 30/622:25
ORD
-
LGW
1 stop10h 15m
Icelandair
Deal found 2/3£420
Wed 15/406:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Mon 20/419:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Deal found 3/3£421
Fri 30/1010:35
LHR
-
ORD
2 stops36h 10m
Scandinavian Airlines
Sun 1/1119:20
ORD
-
LHR
2 stops39h 05m
Scandinavian Airlines
Deal found 2/3£422
Tue 14/419:30
LHR
-
ORD
1 stop26h 40m
Scandinavian Airlines
Mon 27/419:15
ORD
-
LHR
1 stop14h 45m
Scandinavian Airlines
Deal found 6/3£423
Thu 16/419:30
LHR
-
ORD
1 stop26h 40m
Scandinavian Airlines
Mon 27/419:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Deal found 5/3£425

Find 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 7 March 2026.

Round-trip from

£415

One-way from

£223

Popular in

July

Cheapest in

September

Average price

£545

Good round-trip deal

£540 or less

Good one-way deal

£426 or less
Icelandair
  • Icelandair
  • 26/5-2/7
  • 2 total stops
  • 21h 40m total
  • United Kingdom to Illinois
Search Deals
12/4
  • 12/4
  • 2 total stops
  • 53h 06m total
  • United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£57 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
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

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 7 March 2026.
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

Cheapest return flight

BirminghamChicago

BHX - ORD

BHXORD

Birmingham

Thu 23/4

19:15-16:10

1 stop26h 55m

Chicago O'Hare Intl

Mon 27/4

19:15-18:35

1 stop17h 20m

£448

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 15/4

07:05-16:10

2 stops15h 05m

Chicago O'Hare Intl

Mon 27/4

19:15-17:00

2 stops15h 45m

£452

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 11/5

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Fri 15/5

22:25-14:40

1 stop10h 15m

£477

LondonChicago

LTN - ORD

LTNORD

London Luton

Tue 14/4

14:45-16:00

2 stops31h 15m

Chicago O'Hare Intl

Sat 25/4

19:25-22:55

2 stops21h 30m

£503

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/4

06:50-12:00

1 stop11h 10m

Chicago O'Hare Intl

Sat 4/4

15:45-06:30

1 stop32h 45m

£521

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 12/4

21:25-18:15

1 stop26h 50m

Chicago O'Hare Intl

Thu 30/4

19:25-20:20

1 stop18h 55m

£523

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Mon 13/4

09:40-22:28

2 stops18h 48m

Chicago Midway

Mon 27/4

17:21-11:20

1 stop11h 59m

£553
Fastest return journey

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 12/4

08:00-10:55

Nonstop8h 55m

Chicago O'Hare Intl

Thu 30/4

18:10-08:30

Nonstop8h 20m

£557

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 14/5

15:50-16:10

3 stops30h 20m

Chicago O'Hare Intl

Tue 19/5

19:15-22:10

2 stops20h 55m

£558

ManchesterChicago

MAN - ORD

MANORD

Manchester

Thu 23/4

19:10-16:10

1 stop27h 00m

Chicago O'Hare Intl

Sun 26/4

06:04-12:05

2 stops24h 01m

£561

Flights are sorted by cheapest return flights first.

Deals found on 4/3

Showing 1-10 of 60 resultsSorted by cheapest first
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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, April is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £122). 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 7 March 2026.

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.

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 7 March 2026.
Read through reviews of airlines operating flights from the United Kingdom 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.
United Airlines
7.4
Good
9,403 reviews
Check prices

Entertainment

7.1

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
9,403 reviews
United Airlines
7.4
Good
9,403 reviews
Check prices

Entertainment

7.1

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Aer Lingus
7.2
Good
1,471 reviews
United Airlines
7.4
Good
9,403 reviews
Check prices

Entertainment

7.1

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Icelandair
7.1
Good
617 reviews
United Airlines
7.4
Good
9,403 reviews
Check prices

Entertainment

7.1

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Lufthansa
6.8
Okay
7,833 reviews
United Airlines
7.4
Good
9,403 reviews
Check prices

Entertainment

7.1

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
British Airways
6.7
Okay
7,776 reviews
United Airlines
7.4
Good
9,403 reviews
Check prices

Entertainment

7.1

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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 11h 10m. Scandinavian Airlines provides one of the quickest options available for as low as £521. 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?

    £261 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on TAP AIR PORTUGAL and JetBlue, with prices starting from £294 and £311, 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, April is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £122). 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.

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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Manchester to LaGuardia flights
London City to Hobby flights
Luton to Los Angeles flights
Gatwick to Hobby flights
Heathrow to Nashville flights

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 7 March 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£287Average£560FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£288Average£677FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£346Average£590FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Aer LingusCheapest£365Average£700FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
TAP AIR PORTUGALCheapest£371Average£578FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£377Average£472FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Brussels AirlinesCheapest£388Average£545FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
British AirwaysCheapest£394Average£580FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£403Average£614FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£413Average£682FlexibilityNo cancel feeOn-time69%
Search United 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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