In terms of precipitation, rainfall in United Kingdom ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit United Kingdom when rainfall is around 1.6 in.

If weather is an important factor for your trip to United Kingdom, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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

Find a great deal and save up to 11% by booking at least 60 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Illinois to United Kingdom within the next two weeks, with the cheapest ticket starting at $701.

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

February can be a great time to fly to United Kingdom from Illinois with a flight ticket averaging about $762. Cheapflights users have found deals in the month of February for as cheap as $463. The most expensive prices can be found in the month of June.

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.

$226+ Flights from Illinois to the United Kingdom

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Cheap flight deals from Illinois to United Kingdom

Round-trip from	$505 (United Airlines)
One-way from	$226 (Booking.com)
Popular in	June
Cheapest in	February
Average price	$713
Good round-trip deal	$572 or less
Good one-way deal	$388 or less

From Illinois to United Kingdom

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One-way flight from Illinois to United Kingdom

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Highest demand for flights based on searches. 21% potential increase in price ($203 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).

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Average for round-trip flights in August 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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Find 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 agosto 14, 2025.

dom. 8/246:05 pmORD - LHR

Nonstop8h 15mUnited Airlines

mié. 9/38:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Deal found 8/14

$505

jue. 12/117:20 pmORD - LHR

1 stop17h 10mScandinavian Airlines

lun. 12/296:40 amLHR - ORD

1 stop16h 05mScandinavian Airlines

Deal found 8/14

$506

mié. 12/36:30 pmORD - LTN

1 stop13h 00mMultiple Airlines

dom. 12/76:00 amLTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 8/14

$506

mar. 9/27:25 pmORD - LGW

1 stop13h 15mIcelandair

mié. 9/103:35 pmLGW - ORD

1 stop11h 40mIcelandair

Deal found 8/14

$506

lun. 9/226:00 pmORD - LHR

Nonstop8h 20mMultiple Airlines

lun. 9/297:30 pmLHR - ORD

1 stop23h 50mMultiple Airlines

Deal found 8/11

$507

mié. 9/1012:50 pmORD - LHR

1 stop12h 05mUnited Airlines

mié. 10/88:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Deal found 8/14

$508

mar. 9/97:25 pmORD - LGW

1 stop13h 15mIcelandair

mar. 9/233:40 pmLGW - ORD

1 stop32h 35mIcelandair

Deal found 8/14

$508

lun. 8/2512:50 pmORD - LHR

1 stop12h 05mUnited Airlines

mié. 9/38:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Deal found 8/14

$509

lun. 12/16:30 pmORD - LTN

1 stop13h 30mMultiple Airlines

dom. 12/146:00 amLTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 8/14

$509

mié. 9/37:25 pmORD - LHR

1 stop10h 30mIcelandair

mié. 9/101:05 pmLHR - ORD

1 stop11h 10mIcelandair

Deal found 8/14

$510

jue. 9/410:15 pmORD - LGW

1 stop31h 30mIcelandair

mar. 9/91:00 pmLGW - ORD

1 stop11h 15mIcelandair

Deal found 8/14

$510

mié. 11/1910:00 amORD - LHR

2 stops15h 10mMultiple Airlines

mar. 12/169:00 amLHR - ORD

2 stops15h 45mMultiple Airlines

Deal found 8/12

$511

Best flights from Illinois to United Kingdom
Discover carefully curated flight deals from Illinois to United Kingdom that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated agosto 14, 2025.

mar. 8/269:25 pmORD - LHR

Nonstop8h 20mUnited Airlines

mié. 9/38:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Deal found 8/14

$505

lun. 9/294:30 pmORD - LGW

1 stop12h 25mIberia

jue. 10/910:40 amLGW - ORD

1 stop14h 55mIberia

Deal found 8/14

$506

mar. 9/97:25 pmORD - LGW

1 stop13h 15mIcelandair

jue. 9/183:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/14

$506

lun. 9/226:00 pmORD - LHR

Nonstop8h 20mMultiple Airlines

lun. 9/297:30 pmLHR - ORD

1 stop23h 50mMultiple Airlines

Deal found 8/11

$507

mar. 8/192:15 pmSTL - LHR

2 stops16h 55mDelta

mar. 8/2611:30 amLHR - STL

2 stops17h 54mDelta

Deal found 8/11

$527

lun. 10/612:25 pmSTL - LHR

2 stops15h 10mAir Canada

mar. 10/149:30 amLHR - STL

2 stops16h 08mAir Canada

Deal found 8/13

$527

dom. 11/29:35 amMDW - LHR

2 stops15h 30mVirgin Atlantic

mié. 11/196:20 amLHR - MDW

2 stops17h 47mVirgin Atlantic

Deal found 8/12

$534

mar. 8/197:05 pmORD - LCY

1 stop11h 25mSWISS

lun. 8/256:05 pmLCY - ORD

1 stop24h 05mSWISS

Deal found 8/12

$534

dom. 9/287:22 amSTL - LGW

2 stops18h 28mAmerican Airlines

dom. 10/510:40 amLGW - STL

2 stops19h 13mAmerican Airlines

Deal found 8/14

$543

jue. 10/97:15 pmORD - EDI

2 stops30h 05mScandinavian Airlines

dom. 10/1911:45 amEDI - ORD

2 stops34h 25mScandinavian Airlines

Deal found 8/12

$705

vie. 10/178:05 pmSTL - LGW

2 stops17h 55mBritish Airways

mar. 10/2111:40 amLGW - STL

2 stops18h 14mBritish Airways

Deal found 8/14

$707

dom. 11/93:55 pmORD - EDI

1 stop9h 55mAer Lingus

vie. 11/148:20 amEDI - ORD

1 stop11h 40mAer Lingus

Deal found 8/12

$707

Last-minute flights from Illinois to United Kingdom
Discover last-minute flight deals from Illinois to United Kingdom. Data last updated agosto 14, 2025 and is based on user searches.

mar. 8/1910:35 pmORD - LHR

Nonstop7h 40mBritish Airways

jue. 9/42:25 pmLHR - ORD

Nonstop8h 35mBritish Airways

Deal found 8/12

$517

mar. 8/194:05 pmORD - LHR

Nonstop8h 15mUnited Airlines

lun. 8/251:45 pmLHR - ORD

1 stop30h 15mUnited Airlines

Deal found 8/12

$518

mar. 8/192:15 pmSTL - LHR

2 stops16h 55mDelta

mar. 8/2611:30 amLHR - STL

2 stops17h 54mDelta

Deal found 8/11

$527

mar. 8/197:05 pmORD - LCY

1 stop11h 25mSWISS

lun. 8/256:05 pmLCY - ORD

1 stop24h 05mSWISS

Deal found 8/12

$534

mié. 8/202:10 pmORD - LHR

1 stop10h 35mKLM

mié. 10/18:40 amLHR - ORD

1 stop12h 00mKLM

Deal found 8/12

$516

mié. 8/2012:36 pmORD - LHR

1 stop13h 04mBritish Airways

mar. 9/309:15 amLHR - ORD

Nonstop8h 35mBritish Airways

Deal found 8/13

$520

vie. 8/2210:15 pmORD - LHR

1 stop16h 05mIcelandair

mar. 8/269:25 pmLHR - ORD

1 stop29h 50mIcelandair

Deal found 8/11

$507

sáb. 8/235:52 pmSTL - LHR

1 stop33h 08mIberia

vie. 9/59:15 amLHR - STL

1 stop17h 17mIberia

Deal found 8/12

$531

dom. 8/246:05 pmORD - LHR

Nonstop8h 15mUnited Airlines

mié. 9/38:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Deal found 8/14

$505

dom. 8/249:25 pmORD - LHR

Nonstop8h 20mUnited Airlines

mar. 9/28:45 amLHR - ORD

1 stop13h 10mUnited Airlines

Deal found 8/13

$506

dom. 8/244:05 pmORD - LHR

Nonstop8h 15mMultiple Airlines

mar. 9/29:00 amLHR - ORD

1 stop15h 15mMultiple Airlines

Deal found 8/12

$509

dom. 8/247:41 pmSTL - LHR

1 stop12h 44mBritish Airways

vie. 9/57:00 amLHR - STL

2 stops20h 06mBritish Airways

Deal found 8/12

$529

One-way flights from Illinois to United Kingdom
Search for one-way flight options from Illinois to United Kingdom. Find affordable one-way fares based on user searches. Data last updated agosto 14, 2025.

sáb. 10/116:15 pmORD - LHR

1 stop17h 30mTAP AIR PORTUGAL

Deal found 8/14

$226

jue. 10/26:44 pmORD - LGW

2 stops29h 36mMultiple Airlines

Deal found 8/13

$226

dom. 9/286:00 pmORD - LHR

1 stop17h 45mTAP AIR PORTUGAL

Deal found 8/12

$227

dom. 9/2110:27 amORD - LGW

1 stop14h 23mMultiple Airlines

Deal found 8/13

$227

mié. 11/127:10 pmORD - LGW

1 stop13h 55mTAP AIR PORTUGAL

Deal found 8/12

$228

jue. 9/2510:27 amORD - LGW

1 stop14h 33mMultiple Airlines

Deal found 8/13

$229

mié. 9/1711:13 amORD - LGW

1 stop13h 07mMultiple Airlines

Deal found 8/13

$230

mar. 9/305:17 pmORD - LGW

1 stop34h 43mMultiple Airlines

Deal found 8/12

$231

dom. 9/286:00 pmORD - LGW

1 stop15h 10mTAP AIR PORTUGAL

Deal found 8/14

$232

vie. 10/319:15 pmORD - EDI

2 stops29h 15mMultiple Airlines

Deal found 8/14

$232

dom. 10/195:30 pmORD - LHR

1 stop36h 35mWestJet

Deal found 8/12

$233

sáb. 10/116:15 pmORD - LGW

1 stop33h 30mTAP AIR PORTUGAL

Deal found 8/14

$233

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 8/26

9:25 pm-11:45 am

Nonstop8h 20m

London Heathrow

mié. 9/3

8:40 am-3:55 pm

1 stop13h 15m

$505

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 9/2

9:25 pm-11:45 am

Nonstop8h 20m

London Heathrow

mar. 9/9

8:45 am-3:55 pm

1 stop13h 10m

$505

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

lun. 10/27

6:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

mié. 11/12

9:00 am-4:20 pm

1 stop13h 20m

$505

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

lun. 8/25

4:05 pm-6:20 am

Nonstop8h 15m

London Heathrow

mié. 9/3

8:40 am-3:55 pm

1 stop13h 15m

$505

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

lun. 9/29

4:30 pm-10:55 am

1 stop12h 25m

London Gatwick

jue. 10/9

10:40 am-7:35 pm

1 stop14h 55m

$506

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

mar. 9/9

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

jue. 9/18

3:40 pm-9:15 pm

1 stop11h 35m

$506

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

mar. 9/2

10:15 pm-2:40 pm

1 stop10h 25m

London Gatwick

mié. 9/10

3:35 pm-9:15 pm

1 stop11h 40m

$506

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

lun. 9/22

6:00 pm-8:20 am

Nonstop8h 20m

London Heathrow

lun. 9/29

7:30 pm-1:20 pm

1 stop23h 50m

$507

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

mar. 9/9

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

sáb. 9/13

3:40 pm-6:15 pm

1 stop32h 35m

$508

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

jue. 9/11

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

mar. 9/16

3:40 pm-6:15 pm

1 stop32h 35m

$508

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 60 results

...

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, November is the cheapest month in which you can book a flight from Illinois to United Kingdom (average of $661). Flying from Illinois to United Kingdom in June is currently the most expensive (average of $1,097). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to United Kingdom as you normally would.

Weekly flight availability from Illinois to United Kingdom

The most flights from USIL to GB0 are scheduled on a Wednesday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (46 on average).

Related info for your journey

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, November is the cheapest month in which you can book a flight from Illinois to United Kingdom (average of $661). Flying from Illinois to United Kingdom in June is currently the most expensive (average of $1,097). 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

Top 10 airlines flying from Illinois to United Kingdom

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest$51	Average$754	FlexibilityNo cancel fee	On-time62%
SWISS	Cheapest$257	Average$671	FlexibilityNo cancel fee	On-time79%
Scandinavian Airlines	Cheapest$338	Average$594	FlexibilityNo cancel fee	On-time77%
Delta	Cheapest$345	Average$1,019	FlexibilityNo cancel fee	On-timeN/A
Lufthansa	Cheapest$400	Average$933	FlexibilityNo cancel fee	On-time76%
Icelandair	Cheapest$468	Average$655	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$502	Average$847	FlexibilityNo cancel fee	On-time70%
TAP AIR PORTUGAL	Cheapest$508	Average$797	FlexibilityNo cancel fee	On-timeN/A
Aer Lingus	Cheapest$531	Average$808	FlexibilityNo cancel fee	On-timeN/A
Finnair	Cheapest$562	Average$747	FlexibilityNo cancel fee	On-time76%

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$226+ 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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to United Kingdom with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap 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 agosto 14, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to United Kingdom

Cheapest flights from Illinois to United KingdomExplore 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 agosto 14, 2025.

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 agosto 14, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to the United Kingdom that are best for you.

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.

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?

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 agosto 14, 2025.

Weekly flight availability from Illinois to United Kingdom

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.

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

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

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

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

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.

Top 10 airlines flying from Illinois to United Kingdom

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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 agosto 14, 2025.