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$206+ 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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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 23, 2025.

This oojo deal was found by Cheapflights users on 12/20. 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.
Tue 12/306:30 pmORD - LHR
1 stop10h 20mIcelandair
Sat 1/318:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 12/20$564
This Kiwi.com deal was found by Cheapflights users on 12/21. 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.
Wed 12/311:24 pmORD - LHR
1 stop11h 16mMultiple Airlines
Tue 1/137:40 amLHR - ORD
1 stop12h 30mMultiple Airlines
Deal found 12/21$571
This FlightHub deal was found by Cheapflights users on 12/21. 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.
Mon 12/296:30 pmORD - LHR
1 stop19h 00mIcelandair
Tue 1/1312:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/21$583
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/306:30 pmORD - LHR
1 stop10h 20mIcelandair
Wed 1/1412:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/21$587
This Kiwi.com deal was found by Cheapflights users on 12/21. 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.
Wed 12/311:24 pmORD - LHR
1 stop11h 16mMultiple Airlines
Thu 1/156:00 amLHR - ORD
1 stop12h 45mMultiple Airlines
Deal found 12/21$588
This Cheapflightsfares deal was found by Cheapflights users on 12/22. 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.
Wed 12/316:50 pmORD - LHR
1 stop15h 30mSWISS
Tue 1/206:00 amLHR - ORD
1 stop12h 45mSWISS
Deal found 12/22$596
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/306:30 pmORD - LHR
1 stop10h 20mIcelandair
Thu 1/1512:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/21$605
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/306:30 pmORD - LHR
1 stop10h 20mIcelandair
Thu 1/2212:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/22$607
This KAYAK deal was found by Cheapflights users on 12/19. 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.
Mon 12/296:30 pmORD - LHR
1 stop19h 00mIcelandair
Mon 1/198:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 12/19$608
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
Wed 12/311:24 pmORD - LHR
1 stop11h 16mAustrian Airlines
Fri 1/2312:05 pmLHR - ORD
1 stop12h 32mAustrian Airlines
Deal found 12/22$614
This Cheapflightsfares deal was found by Cheapflights users on 12/22. 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.
Wed 12/314:10 pmORD - LCY
1 stop11h 15mSWISS
Tue 1/209:15 amLCY - ORD
1 stop13h 05mSWISS
Deal found 12/22$614
This KAYAK deal was found by Cheapflights users on 12/22. 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 12/314:10 pmORD - LCY
1 stop18h 55mSWISS
Wed 1/149:20 amLCY - ORD
1 stop13h 00mSWISS
Deal found 12/22$649

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 23, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$474
(CrystalTravel)

One-way from

$206
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$858

Good round-trip deal

$667 or less

Good one-way deal

$399 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
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From Illinois to United Kingdom
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One-way flight from Illinois to United Kingdom
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($200 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Price to beat on a round-trip flight from Illinois to United Kingdom.
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Price to beat on a one-way flight from Illinois to United Kingdom.
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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 23, 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

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Tue 1/20

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Mon 1/26

12:35 pm-5:20 pm

1 stop10h 45m

$491

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Sat 1/17

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Sat 1/31

12:35 pm-5:20 pm

1 stop10h 45m

$491

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Tue 2/3

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Sat 2/7

12:35 pm-5:20 pm

1 stop10h 45m

$491

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Mon 2/16

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Fri 2/20

12:35 pm-5:20 pm

1 stop10h 45m

$492

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Tue 3/17

7:30 pm-2:50 pm

1 stop14h 20m

London Luton

Tue 3/24

7:00 am-6:20 pm

1 stop16h 20m

$550

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Tue 3/17

7:30 pm-2:50 pm

1 stop14h 20m

London Luton

Wed 3/25

8:00 am-6:20 pm

1 stop15h 20m

$551

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 1/17

6:30 pm-4:05 pm

2 stops15h 35m

London Luton

Sat 1/24

9:00 am-5:20 pm

2 stops14h 20m

$560

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 3/6

7:10 pm-9:35 am

2 stops32h 25m

London Heathrow

Fri 3/13

7:05 am-5:55 pm

2 stops15h 50m

$589

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 1/11

5:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

Wed 1/21

9:00 am-4:20 pm

1 stop13h 20m

$621

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 3/18

12:50 pm-10:15 pm

1 stop28h 25m

London Stansted

Tue 3/24

5:20 pm-7:25 pm

1 stop31h 05m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Showing 1-10 of 60 results
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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 23, 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 30% 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 Friday 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 23, 2025.

The most flights from USIL to GB0 are scheduled on a Monday (45 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (45 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 05m. Icelandair provides one of the quickest options available for as low as $621. 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 $174 and Icelandair from $188 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.
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LaGuardia to Leonardo da Vinci/Fiumicino flights
Seattle to Heathrow flights
Boston to Dublin flights
Dulles Intl to Leonardo da Vinci/Fiumicino 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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$724FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$573FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$331Average$601FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$1,028FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$428Average$614FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$437Average$673FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$460Average$947FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$494Average$837FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$502Average$823FlexibilityNo cancel feeOn-time70%
FinnairCheapest$517Average$759FlexibilityNo cancel feeOn-time76%

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