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Cheap flights from the United Kingdom to Illinois from £259

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 13/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
4 May — 11 May1
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 4 April 2026.

Wed 29/415:10
EDI
-
ORD
2 stops33h 05m
Multiple Airlines
Wed 6/519:25
ORD
-
EDI
2 stops22h 55m
Multiple Airlines
Deal found 30/3£477
Wed 15/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Mon 20/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 31/3£498
Thu 16/421:25
LHR
-
ORD
1 stop30h 00m
Icelandair
Wed 22/419:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Deal found 31/3£499
Wed 18/1111:55
LGW
-
ORD
1 stop11h 25m
Icelandair
Thu 3/1218:30
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 30/3£500
Wed 29/413:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Wed 6/519:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Deal found 30/3£500
Fri 17/415:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Thu 7/519:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 31/3£501
Tue 14/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Sun 19/422:25
ORD
-
LHR
1 stop31h 30m
Icelandair
Deal found 30/3£501
Mon 20/413:10
STN
-
ORD
2 stops35h 05m
Multiple Airlines
Mon 4/519:25
ORD
-
STN
2 stops15h 25m
Multiple Airlines
Deal found 31/3£501
Sun 19/415:40
LGW
-
ORD
1 stop32h 35m
Icelandair
Thu 7/519:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 31/3£502
Mon 20/413:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Mon 4/519:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Deal found 31/3£502
Sat 18/405:55
STN
-
ORD
2 stops18h 20m
Multiple Airlines
Sat 25/419:25
ORD
-
STN
2 stops22h 40m
Multiple Airlines
Deal found 1/4£502
Fri 10/415:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Sun 26/419:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 31/3£502

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 4 April 2026.

Round-trip from

£477

One-way from

£259

Popular in

July

Cheapest in

September

Average price

£530

Good round-trip deal

£621 or less

Good one-way deal

£457 or less
29/4-6/5
  • 29/4-6/5
  • 4 total stops
  • 56h 00m total
  • United Kingdom to Illinois
Search Deals
13/5
  • 13/5
  • 2 total stops
  • 22h 03m 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 (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 4 April 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

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 16/4

09:25-18:15

2 stops14h 50m

Chicago O'Hare Intl

Wed 29/4

19:25-21:15

2 stops19h 50m

£508

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 23/4

05:00-09:40

2 stops34h 40m

Chicago O'Hare Intl

Tue 28/4

11:25-14:00

2 stops20h 35m

£511

LondonChicago

LTN - ORD

LTNORD

London Luton

Tue 28/4

13:40-16:00

2 stops32h 20m

Chicago O'Hare Intl

Tue 5/5

09:55-13:25

3 stops21h 30m

£545

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 29/4

06:15-17:50

2 stops17h 35m

Chicago O'Hare Intl

Tue 5/5

09:55-15:30

3 stops23h 35m

£558

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 4/5

06:50-12:00

1 stop11h 10m

Chicago O'Hare Intl

Mon 18/5

14:40-07:15

1 stop10h 35m

£601

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 21/5

21:05-16:10

2 stops25h 05m

Chicago O'Hare Intl

Thu 28/5

10:25-09:20

2 stops16h 55m

£607

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 15/6

21:25-21:25

1 stop30h 00m

Chicago O'Hare Intl

Mon 22/6

22:25-20:20

1 stop15h 55m

£616

EdinburghChicago

EDI - ORD

EDIORD

Edinburgh Turnhouse

Tue 8/9

19:10-13:52

2 stops48h 42m

Chicago O'Hare Intl

Wed 30/9

07:00-18:25

2 stops29h 25m

£621

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 6/5

09:55-20:40

2 stops16h 45m

Chicago O'Hare Intl

Sun 17/5

18:31-14:35

1 stop14h 04m

£628

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sun 28/6

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Wed 29/7

19:25-11:45

1 stop10h 20m

£628

Flights are sorted by cheapest return flights first.

Deals found on 3/4

Showing 1-10 of 60 resultsSorted by cheapest first
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2
3
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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 £44). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £468). 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 4 April 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.

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 4 April 2026.

The most flights from GB0 to USIL are scheduled on a Friday (52 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (27 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 4 April 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
9,542 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

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
9,542 reviews
United Airlines
7.4
Good
9,542 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

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
1,499 reviews
United Airlines
7.4
Good
9,542 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

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
7.0
Good
630 reviews
United Airlines
7.4
Good
9,542 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

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
7,890 reviews
United Airlines
7.4
Good
9,542 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

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
7,848 reviews
United Airlines
7.4
Good
9,542 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

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. United Airlines provides one of the quickest options available for as low as £601. 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?

    £264 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on JetBlue and United Airlines, with prices starting from £315 and £326, 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 £44). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £468). 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

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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.
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Luton to Los Angeles flights
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Heathrow to Denver flights
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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 4 April 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£38Average£49FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
IcelandairCheapest£291Average£556FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£291Average£706FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£350Average£607FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Aer LingusCheapest£369Average£707FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
TAP AIR PORTUGALCheapest£376Average£518FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£381Average£480FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Brussels AirlinesCheapest£400Average£565FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
British AirwaysCheapest£401Average£594FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£410Average£636FlexibilityNo 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.

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