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Cheap flights from the United Kingdom to Illinois from £308

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 25/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
1 Jun — 8 Jun1
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 2 May 2026.

Thu 5/1108:30
MAN
-
ORD
2 stops14h 50m
Multiple Airlines
Mon 16/1118:30
ORD
-
MAN
1 stop10h 15m
Multiple Airlines
Deal found 28/4£500
Wed 2/1206:00
MAN
-
ORD
2 stops17h 20m
Multiple Airlines
Mon 7/1219:25
ORD
-
MAN
1 stop9h 20m
Multiple Airlines
Deal found 1/5£501
Thu 10/906:55
MAN
-
ORD
2 stops16h 55m
Multiple Airlines
Tue 22/919:25
ORD
-
MAN
1 stop10h 15m
Multiple Airlines
Deal found 28/4£501
Thu 10/906:55
MAN
-
ORD
2 stops16h 55m
Multiple Airlines
Thu 24/919:25
ORD
-
MAN
1 stop10h 15m
Multiple Airlines
Deal found 28/4£502
Sat 5/907:45
MAN
-
ORD
2 stops16h 05m
Multiple Airlines
Sat 19/919:25
ORD
-
MAN
1 stop10h 15m
Multiple Airlines
Deal found 28/4£503
Sat 5/907:45
MAN
-
ORD
2 stops16h 05m
Multiple Airlines
Sun 20/919:25
ORD
-
MAN
1 stop10h 15m
Multiple Airlines
Deal found 28/4£504
Fri 5/614:40
MAN
-
ORD
2 stops33h 35m
Multiple Airlines
Sun 14/619:25
ORD
-
MAN
2 stops18h 20m
Multiple Airlines
Deal found 30/4£509
Wed 7/1013:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Tue 13/1019:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 28/4£510
Sat 5/907:45
MAN
-
ORD
2 stops16h 05m
Multiple Airlines
Wed 16/921:00
ORD
-
MAN
1 stop10h 55m
Multiple Airlines
Deal found 30/4£510
Thu 5/1106:15
LTN
-
ORD
1 stop13h 45m
Multiple Airlines
Sun 8/1115:55
ORD
-
LTN
1 stop11h 00m
Multiple Airlines
Deal found 28/4£511
Thu 5/1106:45
STN
-
ORD
1 stop13h 15m
Multiple Airlines
Sun 8/1115:55
ORD
-
STN
1 stop11h 55m
Multiple Airlines
Deal found 28/4£511
Tue 1/913:00
LGW
-
ORD
1 stop14h 25m
Icelandair
Tue 8/922:25
ORD
-
LGW
1 stop10h 15m
Icelandair
Deal found 2/5£512

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 2 May 2026.

Round-trip from

£501

One-way from

£308

Popular in

July

Cheapest in

February

Average price

£534

Good round-trip deal

£669 or less

Good one-way deal

£534 or less
Icelandair
  • Icelandair
  • 10/9-19/9
  • 3 total stops
  • 27h 10m total
  • United Kingdom to Illinois
Search Deals
25/8
  • 25/8
  • 3 total stops
  • 37h 25m total
  • United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£51 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 May 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 2 May 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

LGW - ORD

LGWORD

London Gatwick

Tue 22/9

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Tue 29/9

19:25-14:40

1 stop13h 15m

£557

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 16/9

15:40-21:25

1 stop11h 45m

Chicago O'Hare Intl

Thu 24/9

19:25-14:40

1 stop13h 15m

£560

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 3/9

13:00-18:15

1 stop11h 15m

Chicago O'Hare Intl

Thu 10/9

19:25-14:40

1 stop13h 15m

£582

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 14/9

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Mon 5/10

18:05-08:30

Nonstop8h 25m

£586

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 13/5

06:15-09:00

3 stops32h 45m

Chicago O'Hare Intl

Fri 29/5

15:50-17:25

2 stops19h 35m

£595

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 14/5

17:35-16:00

2 stops28h 25m

Chicago O'Hare Intl

Sun 31/5

09:55-21:55

2 stops30h 00m

£595

ManchesterChicago

MAN - ORD

MANORD

Manchester

Wed 13/5

07:55-19:40

2 stops17h 45m

Chicago O'Hare Intl

Mon 1/6

10:00-17:50

2 stops25h 50m

£598

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 8/10

12:10-15:55

1 stop33h 45m

Chicago O'Hare Intl

Tue 20/10

16:25-06:45

Nonstop8h 20m

£618

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Wed 16/9

06:30-16:27

2 stops15h 57m

Chicago Midway

Wed 7/10

13:05-06:25

1 stop11h 20m

£621

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 27/8

18:45-16:00

1 stop27h 15m

Chicago O'Hare Intl

Sat 5/9

18:05-17:45

1 stop17h 40m

£634

Flights are sorted by cheapest return flights first.

Deals found on 28/4

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

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

Booking 28 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.

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 £428). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £702). 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 2 May 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 2 May 2026.

The most flights from GB0 to USIL are scheduled on a Wednesday (52 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (44 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 2 May 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
9,682 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
9,682 reviews
United Airlines
7.4
Good
9,682 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
7.3
Good
1,540 reviews
United Airlines
7.4
Good
9,682 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
647 reviews
United Airlines
7.4
Good
9,682 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
7,964 reviews
United Airlines
7.4
Good
9,682 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

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
7,940 reviews
United Airlines
7.4
Good
9,682 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

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 45m. Icelandair provides one of the quickest options available for as low as £560. The distance between United Kingdom and Illinois is about 3960 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?

    £256 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 £307 and £317, 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 £428). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £702). 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.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Heathrow to LaGuardia flights
Gatwick to John F Kennedy Intl flights
Stansted to John F Kennedy Intl flights
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Gatwick to LaGuardia flights
Luton to John F Kennedy Intl flights
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Heathrow to Orlando flights
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Stansted to Newark flights
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Heathrow to San Francisco flights
Heathrow to Dulles Intl flights
Heathrow to Seattle flights
Heathrow to Las Vegas flights
Gatwick to Orlando flights
Heathrow to Hobby flights
Heathrow to Atlanta flights
Heathrow to Baltimore flights
Gatwick to Boston flights
Gatwick to Los Angeles flights
Stansted to Los Angeles flights
London City to Los Angeles flights
Manchester to Newark flights
Stansted to Orlando flights
Gatwick to Miami flights
Heathrow to George Bush Intcntl flights
Stansted to Miami flights
Manchester to LaGuardia flights
Heathrow to Tampa flights
Edinburgh to John F Kennedy Intl flights
London City to Miami flights
Edinburgh to Newark flights
Heathrow to Denver flights
London City to Boston flights
London City to Orlando flights
Gatwick to San Francisco flights
Gatwick to O'Hare Intl flights
Stansted to Boston flights
Heathrow to Nashville flights
Heathrow to Philadelphia 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 2 May 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£37Average£47FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
IcelandairCheapest£282Average£537FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£340Average£603FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Aer LingusCheapest£359Average£690FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£364Average£468FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£381Average£508FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
British AirwaysCheapest£388Average£581FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Brussels AirlinesCheapest£389Average£569FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£391Average£684FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£399Average£632FlexibilityNo 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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