HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
United Kingdom

$188+ Cheap flights from Illinois to the United Kingdom

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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to United Kingdom with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Illinois to United Kingdom

Cheapest flights from Illinois to United Kingdom
Explore the most affordable flight options available from Illinois to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

This FlightHub deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/78:25 pmORD - LGW
1 stop13h 20mTAP AIR PORTUGAL
Sat 1/314:35 pmLGW - ORD
1 stop28h 10mTAP AIR PORTUGAL
Deal found 12/3$563
This FlightHub deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:10 pmORD - LHR
1 stop14h 20mTAP AIR PORTUGAL
Sun 12/76:00 amLHR - ORD
1 stop14h 45mTAP AIR PORTUGAL
Deal found 12/3$565
This Kiwi.com deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:30 pmORD - MAN
1 stop10h 15mMultiple Airlines
Mon 2/97:25 amMAN - ORD
2 stops31h 47mMultiple Airlines
Deal found 12/3$568
This KAYAK deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/96:30 pmORD - LGW
1 stop10h 25mIcelandair
Sun 2/111:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 12/3$569
This United Airlines deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:45 pmORD - LHR
Nonstop8h 10mUnited Airlines
Tue 1/1311:10 amLHR - ORD
1 stop13h 15mUnited Airlines
Deal found 12/3$570
This Cheapflightsfares deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/76:30 pmORD - LGW
1 stop10h 25mIcelandair
Fri 1/3011:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 12/3$571
This KAYAK deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:30 pmORD - LHR
1 stop10h 20mIcelandair
Wed 1/2812:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/3$572
This Cheapflightsfares deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/76:30 pmORD - LHR
1 stop10h 20mIcelandair
Fri 1/3012:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/3$574
This oojo deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:30 pmORD - LHR
1 stop19h 00mIcelandair
Mon 1/128:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 12/3$575
This oojo deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/78:25 pmORD - LGW
1 stop13h 20mTAP AIR PORTUGAL
Thu 12/254:00 pmLGW - ORD
1 stop29h 25mTAP AIR PORTUGAL
Deal found 12/3$575
This Mytrip deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1012:50 pmORD - STN
2 stops26h 05mMultiple Airlines
Tue 12/167:40 amSTN - ORD
2 stops18h 30mMultiple Airlines
Deal found 12/4$576
This Kiwi.com deal was found by Cheapflights users on 12/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/93:50 pmORD - LTN
1 stop11h 55mMultiple Airlines
Tue 12/169:00 amLTN - ORD
1 stop14h 55mMultiple Airlines
Deal found 12/2$578

Find flight deals from Illinois to United Kingdom

Keep the following information in mind while searching for Illinois to United Kingdom flight deals. Data was last updated December 4, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$445
(Mytrip)

One-way from

$188
(Booking.com)

Popular in

June

Cheapest in

February

Average price

$807

Good round-trip deal

$689 or less

Good one-way deal

$448 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
Search Deals
From Illinois to United Kingdom
Search Deals
One-way flight from Illinois to United Kingdom
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($206 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Illinois to United Kingdom.
Search Deals
Price to beat on a one-way flight from Illinois to United Kingdom.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to United Kingdom 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 2,558,603 searches. Data last updated December 4, 2025.
Use the filters below to find and compare flights from Illinois to the United Kingdom that are best for you.

Fly from

Illinois

Fly to

United Kingdom

Route

Depart

Return

Price

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Mon 1/12

6:30 pm-8:15 pm

2 stops19h 45m

Edinburgh Turnhouse

Tue 1/20

8:40 am-5:20 pm

2 stops14h 40m

$471

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Wed 2/11

6:30 pm-10:15 pm

2 stops21h 45m

Edinburgh Turnhouse

Mon 2/16

10:30 pm-5:20 pm

2 stops24h 50m

$515

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Wed 1/28

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Fri 2/20

12:35 pm-5:20 pm

1 stop10h 45m

$516

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Fri 1/30

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Tue 2/17

12:35 pm-5:20 pm

1 stop10h 45m

$516

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Wed 1/28

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Sat 2/21

12:35 pm-5:20 pm

1 stop10h 45m

$516

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Sun 1/25

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Sat 2/21

12:35 pm-5:20 pm

1 stop10h 45m

$516

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Fri 1/30

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Thu 2/19

11:35 am-5:20 pm

1 stop11h 45m

$516

ChicagoManchester

ORD - MAN

ORDMAN

Chicago O'Hare Intl

Sun 3/8

8:20 pm-8:05 pm

2 stops18h 45m

Manchester

Thu 3/12

10:10 am-5:45 pm

1 stop12h 35m

$550

ChicagoManchester

ORD - MAN

ORDMAN

Chicago O'Hare Intl

Sat 2/7

7:00 am-6:35 pm

2 stops29h 35m

Manchester

Thu 2/19

10:10 am-4:45 pm

1 stop12h 35m

$556

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 3/18

8:20 pm-6:50 pm

2 stops17h 30m

London Heathrow

Sun 3/22

10:35 am-5:45 pm

2 stops36h 10m

$557

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Illinois to United Kingdom

Have a flexible travel schedule? Discover the best time to fly to United Kingdom from Illinois with our price prediction graph.
Estimated round-trip 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 Illinois to the United Kingdom

What is the cheapest month to book a flight from Illinois to United Kingdom?

Currently, December is the cheapest month in which you can book a flight from Illinois to United Kingdom (average of $101). Flying from Illinois to United Kingdom in July is currently the most expensive (average of $603). 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 IL to GB?

Find hourly flight availability from Illinois to United Kingdom. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 4, 2025.

One of the essential ways to save on airfare from Illinois to United Kingdom is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.

What is the cheapest day to fly from Illinois to United Kingdom?

Use this chart to determine the cheapest time to fly round-trip from Illinois to United Kingdom. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Illinois to United Kingdom flight should consider departing on Tuesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Illinois to United Kingdom

Explore weekly flight availability from Illinois to United Kingdom. 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 December 4, 2025.

The most flights from USIL to GB0 are scheduled on a Thursday (45 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (37 on average).

Related info for your journey

Find useful and relevant information for your journey from Illinois to United Kingdom. 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 Illinois to United Kingdom?

    A quick flight from Illinois to United Kingdom can take about 8h 10m. Icelandair provides one of the quickest options available for as low as $573. The distance from Illinois to United Kingdom is about 3939 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Illinois to United Kingdom one-way?

    One-way options have recently been found by users for as low as $135 on JetBlue. Other airlines that offer cheap prices include Scandinavian Airlines from $149 and Icelandair from $187 one-way.

  • Can I find deals for flights from Illinois to United Kingdom that include hotel bookings?

    Yes. In addition to deals on Illinois to United Kingdom flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to United Kingdom?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to United Kingdom.

  • Can I find deals for business class flights from Illinois to United Kingdom?

    Yes. Cheapflights offers flight deals from Illinois to United Kingdom 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 Illinois to United Kingdom?

    Currently, December is the cheapest month in which you can book a flight from Illinois to United Kingdom (average of $101). Flying from Illinois to United Kingdom in July is currently the most expensive (average of $603). 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 Illinois to United Kingdom

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Charles de Gaulle flights
Newark to Charles de Gaulle flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
Newark to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Gatwick flights
LaGuardia to Heathrow flights
John F Kennedy Intl to London City flights
Boston to Heathrow flights
Los Angeles to Heathrow flights
Newark to Gatwick flights
Miami to Madrid flights
John F Kennedy Intl to Lisbon flights
Newark to Orly flights
Dulles Intl to Heathrow flights
LaGuardia to Gatwick flights
John F Kennedy Intl to Orly flights
Newark to Barcelona-El Prat flights
John F Kennedy Intl to Stansted flights
John F Kennedy Intl to Istanbul flights
Newark to Madrid flights
LaGuardia to Charles de Gaulle flights
John F Kennedy Intl to Malpensa flights
John F Kennedy Intl to Barcelona-El Prat flights
Newark to Lisbon flights
O'Hare Intl to Heathrow flights
Newark to Malpensa flights
John F Kennedy Intl to Dublin flights
John F Kennedy Intl to Madrid flights
O'Hare Intl to Charles de Gaulle flights
Boston to Charles de Gaulle flights
Newark to Athens flights
Newark to Dublin flights
San Francisco to Heathrow flights
Los Angeles to Charles de Gaulle flights
Dulles Intl to Charles de Gaulle flights
John F Kennedy Intl to Luton flights
Newark to Frankfurt flights
San Francisco to Charles de Gaulle flights
Baltimore to Heathrow flights
LaGuardia to Leonardo da Vinci/Fiumicino flights
Boston to Leonardo da Vinci/Fiumicino flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
Boston to Dublin flights
Seattle to Heathrow flights
John F Kennedy Intl to Frankfurt flights
Dulles Intl to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Athens flights
John F Kennedy Intl to Amsterdam flights

Top 10 airlines flying from Illinois to United Kingdom

Discover the top 10 airlines that operate flights from Illinois to United Kingdom. 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 2,558,603 searches. Data last updated December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$784FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$573FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$620FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$1,028FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$437Average$666FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$450Average$639FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$460Average$941FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$502Average$822FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$505Average$839FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$522Average$919FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.