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Cheap flights from the United Kingdom to Illinois from £281

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
5 Sep — 12 Sep1
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 6 August 2026.

Sat 5/911:30 -
Nonstop8h 35m
Sat 5/920:40 -
1 stop28h 40m
Deal found 4/8£433
Thu 3/915:10 -
2 stops33h 05m
Sun 13/919:25 -
2 stops23h 00m
Deal found 3/8£434
Thu 29/1007:30 -
2 stops15h 50m
Tue 3/1118:30 -
2 stops21h 05m
Deal found 3/8£445
Wed 25/1106:00 -
2 stops17h 20m
Mon 30/1118:30 -
2 stops22h 00m
Deal found 4/8£454
Mon 16/1107:35 -
1 stop12h 25m
Sun 22/1120:10 -
1 stop17h 35m
Deal found 3/8£477
Tue 22/916:25 -
1 stop29h 35m
Wed 21/1018:00 -
1 stop33h 45m
Deal found 5/8£481
Fri 4/906:35 -
1 stop13h 25m
Fri 11/921:00 -
1 stop18h 20m
Deal found 5/8£481
Thu 1/1019:50 -
1 stop26h 10m
Sun 11/1018:00 -
1 stop34h 20m
Deal found 5/8£481
Wed 18/1106:00 -
1 stop14h 00m
Wed 25/1120:10 -
1 stop14h 30m
Deal found 3/8£481
Wed 7/1015:40 -
1 stop11h 45m
Wed 14/1022:25 -
1 stop10h 15m
Deal found 5/8£482
Tue 6/1021:25 -
1 stop26h 50m
Tue 13/1019:25 -
1 stop18h 55m
Deal found 4/8£483
Thu 3/913:00 -
1 stop12h 15m
Thu 10/921:00 -
1 stop20h 25m
Deal found 4/8£483

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 6 August 2026.

Round-trip from

£433

One-way from

£281

Popular in

July

Cheapest in

February

Average price

£668

Good round-trip deal

£634 or less

Good one-way deal

£524 or less
Air Canada
  • Air Canada
  • 5/9-5/9
  • 1 total stop
  • 37h 15m total
  • United Kingdom to Illinois
Search Deals
20/10
  • 20/10
  • 3 total stops
  • 30h 25m total
  • United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£82 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 August 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 6 August 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 London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Mon 28/9

12:25-16:10

3 stops33h 45m

Chicago O'Hare Intl

Mon 5/10

19:15-22:50

2 stops21h 35m

£507

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Tue 8/9

09:40-21:25

2 stops17h 45m

Chicago O'Hare Intl

Tue 22/9

19:25-22:10

2 stops20h 45m

£523

ManchesterChicago

MAN Manchester - ORD Chicago O'Hare Intl

MANORD

Manchester

Thu 12/11

12:55-16:45

2 stops33h 50m

Chicago O'Hare Intl

Fri 27/11

19:15-08:40

2 stops31h 25m

£542

LondonChicago

LGW London Gatwick - ORD Chicago O'Hare Intl

LGWORD

London Gatwick

Wed 30/9

15:40-21:25

1 stop11h 45m

Chicago O'Hare Intl

Sat 10/10

19:25-14:35

1 stop13h 10m

£552

EdinburghChicago

EDI Edinburgh Turnhouse - ORD Chicago O'Hare Intl

EDIORD

Edinburgh Turnhouse

Wed 21/10

09:20-16:10

2 stops36h 50m

Chicago O'Hare Intl

Sun 25/10

20:15-18:25

1 stop17h 10m

£552

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Fri 18/9

06:20-19:15

1 stop18h 55m

Chicago O'Hare Intl

Fri 25/9

21:00-17:25

1 stop14h 25m

£553

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Tue 1/9

13:05-18:15

1 stop11h 10m

Chicago O'Hare Intl

Mon 21/9

19:25-11:55

1 stop10h 30m

£558

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Fri 23/10

06:25-17:50

2 stops17h 25m

Chicago O'Hare Intl

Wed 28/10

16:55-09:15

1 stop11h 20m

£559

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Tue 15/9

21:05-16:10

2 stops25h 05m

Chicago O'Hare Intl

Tue 22/9

19:15-17:40

1 stop16h 25m

£561

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Thu 8/10

21:05-16:10

2 stops25h 05m

Chicago O'Hare Intl

Tue 13/10

19:15-18:30

1 stop17h 15m

£565

Flights are sorted by cheapest return flights first.

Deals found on 1/8

Showing 1-10 of 60 resultsSorted by cheapest first
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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, February is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £478). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £772). 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 6 August 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 6 August 2026.

The most flights from GB0 to USIL are scheduled on a Monday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (35 on average).

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

Booking 79 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 6 August 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
10,072 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.7

Comfort

7.3

Entertainment

7.1

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
10,072 reviews
United Airlines
7.4
Good
10,072 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.7

Comfort

7.3

Entertainment

7.1

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
7.3
Good
1,690 reviews
United Airlines
7.4
Good
10,072 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.7

Comfort

7.3

Entertainment

7.1

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
7.0
Good
721 reviews
United Airlines
7.4
Good
10,072 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.7

Comfort

7.3

Entertainment

7.1

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
8,176 reviews
United Airlines
7.4
Good
10,072 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.7

Comfort

7.3

Entertainment

7.1

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
8,147 reviews
United Airlines
7.4
Good
10,072 reviews
Check prices

Boarding

7.7

Crew

8.1

Food

6.7

Comfort

7.3

Entertainment

7.1

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 45m. Scandinavian Airlines provides one of the quickest options available for as low as £552. 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?

    £295 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 £310 and £322, 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, February is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £478). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £772). 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.

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 6 August 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£36Average£61FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
IcelandairCheapest£203Average£556FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£301Average£649FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Aer LingusCheapest£363Average£739FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£374Average£492FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£386Average£573FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£394Average£613FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
British AirwaysCheapest£410Average£633FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£413Average£764FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£427Average£710FlexibilityNo cancel feeOn-time76%
Search Finnair 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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