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Cheap flights from the United Kingdom to Illinois from £274

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
23 Jul — 30 Jul1
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 23 June 2026.

Thu 20/815:10
EDI
-
ORD
2 stops33h 05m
Multiple Airlines
Mon 31/819:25
ORD
-
EDI
2 stops23h 10m
Multiple Airlines
Deal found 22/6£443
Wed 19/815:10
EDI
-
ORD
2 stops33h 05m
Multiple Airlines
Mon 24/819:25
ORD
-
EDI
2 stops23h 10m
Multiple Airlines
Deal found 21/6£461
Tue 8/917:55
EDI
-
ORD
2 stops33h 40m
Multiple Airlines
Tue 22/915:45
ORD
-
EDI
1 stop10h 15m
Multiple Airlines
Deal found 22/6£505
Thu 20/807:45
EDI
-
ORD
2 stops18h 07m
Multiple Airlines
Wed 26/819:25
ORD
-
EDI
2 stops22h 55m
Multiple Airlines
Deal found 20/6£522
Sat 15/809:00
EDI
-
ORD
1 stop29h 00m
Lufthansa
Sat 29/812:16
ORD
-
EDI
1 stop13h 49m
Lufthansa
Deal found 19/6£532
Wed 16/913:05
MAN
-
ORD
1 stop11h 10m
Icelandair
Wed 30/919:25
ORD
-
MAN
1 stop10h 15m
Icelandair
Deal found 19/6£534
Wed 16/907:55
MAN
-
ORD
1 stop12h 05m
Multiple Airlines
Tue 22/921:00
ORD
-
MAN
1 stop10h 25m
Multiple Airlines
Deal found 21/6£535
Wed 16/907:55
MAN
-
ORD
1 stop12h 05m
Multiple Airlines
Wed 23/915:45
ORD
-
MAN
1 stop10h 45m
Multiple Airlines
Deal found 21/6£536
Fri 21/806:15
MAN
-
ORD
2 stops19h 37m
Multiple Airlines
Mon 31/809:50
ORD
-
MAN
2 stops30h 30m
Multiple Airlines
Deal found 22/6£536
Sat 5/908:15
EDI
-
ORD
2 stops19h 10m
Multiple Airlines
Sat 12/919:25
ORD
-
EDI
2 stops22h 05m
Multiple Airlines
Deal found 20/6£538
Mon 24/805:40
EDI
-
ORD
2 stops21h 45m
Multiple Airlines
Mon 31/822:25
ORD
-
EDI
2 stops18h 15m
Multiple Airlines
Deal found 22/6£539
Mon 14/907:45
MAN
-
ORD
1 stop12h 15m
Multiple Airlines
Mon 21/921:00
ORD
-
MAN
1 stop12h 30m
Multiple Airlines
Deal found 21/6£539

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 23 June 2026.

Round-trip from

£443

One-way from

£274

Popular in

July

Cheapest in

February

Average price

£675

Good round-trip deal

£678 or less

Good one-way deal

£514 or less
20/8-31/8
  • 20/8-31/8
  • 4 total stops
  • 56h 15m total
  • United Kingdom to Illinois
Search Deals
10/9
  • 10/9
  • 3 total stops
  • 39h 20m total
  • United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£80 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 June 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 23 June 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

ManchesterChicago

MAN - ORD

MANORD

Manchester

Thu 12/11

19:15-16:45

1 stop27h 30m

Chicago O'Hare Intl

Mon 16/11

19:15-12:15

2 stops35h 00m

£581
Fastest return journey

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 20/9

14:45-17:35

Nonstop8h 50m

Chicago O'Hare Intl

Thu 24/9

21:00-10:50

Nonstop7h 50m

£582

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 15/10

08:30-18:15

2 stops15h 45m

Chicago O'Hare Intl

Sun 15/11

15:55-09:15

1 stop11h 20m

£582

ManchesterChicago

MAN - ORD

MANORD

Manchester

Tue 20/10

12:45-16:10

2 stops33h 25m

Chicago O'Hare Intl

Tue 3/11

19:15-12:15

2 stops35h 00m

£582

ManchesterChicago

MAN - ORD

MANORD

Manchester

Thu 15/10

09:35-16:10

1 stop12h 35m

Chicago O'Hare Intl

Tue 20/10

19:15-18:30

1 stop17h 15m

£583

EdinburghChicago

EDI - ORD

EDIORD

Edinburgh Turnhouse

Thu 20/8

12:10-21:58

1 stop15h 48m

Chicago O'Hare Intl

Mon 31/8

09:35-09:20

1 stop17h 45m

£584

LondonChicago

LTN - ORD

LTNORD

London Luton

Sun 20/9

11:00-16:10

3 stops35h 10m

Chicago O'Hare Intl

Fri 25/9

19:15-00:30

2 stops23h 15m

£594

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 19/8

18:10-21:20

2 stops33h 10m

Chicago O'Hare Intl

Sun 23/8

22:25-22:20

2 stops17h 55m

£595

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 5/9

07:05-19:46

2 stops18h 41m

Chicago O'Hare Intl

Sat 19/9

21:01-12:10

1 stop33h 09m

£596

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sun 20/9

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Sat 24/10

19:30-14:40

1 stop13h 10m

£603

Flights are sorted by cheapest return flights first.

Deals found on 22/6

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, November is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £465). Flying from United Kingdom to Illinois in June is currently the most expensive (average of £717). 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 23 June 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 23 June 2026.

The most flights from GB0 to USIL are scheduled on a Monday (52 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (47 on average).

How far ahead should I book a flight from United Kingdom to Illinois?

Booking 55 days in advance of your planned departure date is, on average, the best time to get cheap flights from United Kingdom to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 23 June 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
9,873 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

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
9,873 reviews
United Airlines
7.4
Good
9,873 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

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
7.3
Good
1,617 reviews
United Airlines
7.4
Good
9,873 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

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
683 reviews
United Airlines
7.4
Good
9,873 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

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
8,086 reviews
United Airlines
7.4
Good
9,873 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

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
8,064 reviews
United Airlines
7.4
Good
9,873 reviews
Check prices

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

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 8h 50m. Scandinavian Airlines provides one of the quickest options available for as low as £582. 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?

    £300 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 Austrian Airlines, with prices starting from £315 and £327, 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, November is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £465). Flying from United Kingdom to Illinois in June is currently the most expensive (average of £717). 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

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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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Gatwick to San Francisco 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 23 June 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£36Average£60FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
IcelandairCheapest£206Average£561FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£307Average£656FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Turkish AirlinesCheapest£353Average£667FlexibilityNo cancel feeOn-time77%
Search Turkish Airlines flights
Aer LingusCheapest£369Average£747FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£375Average£487FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£393Average£538FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£401Average£624FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
British AirwaysCheapest£416Average£617FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£418Average£729FlexibilityNo cancel feeOn-time76%
Search Lufthansa 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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