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

$459 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on Icelandair and Aer Lingus, with prices starting from $486 and $520, respectively.

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

To save up to 16% on this flight, we recommend booking at least 45 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from United Kingdom to Illinois from $692 1-2 weeks out and tickets from $856 for flights departing within the next 72 hours.

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

February can be a great time to fly to Illinois from United Kingdom with a flight ticket averaging about $712. Cheapflights users have found deals in the month of February for as cheap as $428. The most expensive prices can be found in the month of August.

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 vacation 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.

$580+ Flights from the United Kingdom to Illinois

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

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Cheap flight deals from United Kingdom to Illinois

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$539 (Lufthansa)
One-way from	$320 (Mytrip)
Popular in	August
Cheapest in	February
Average price	$643
Good round-trip deal	$663 or less
Good one-way deal	$665 or less

Provider with most accurate pricing for London (LON)-Chicago (CHI) flight deals.

Search Deals

Provider most trusted by Cheapflights users for London (LON)-Chicago (CHI) flights.

Search Deals

From United Kingdom to Illinois

Search Deals

One-way flight from United Kingdom to Illinois

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($100 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

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.

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Find flight deals from United Kingdom to Illinois

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 March 31, 2025.

Tue 4/226:00 amLHR - ORD

1 stop12h 10mMultiple Airlines

Mon 4/286:05 pmORD - LHR

Nonstop8h 15mMultiple Airlines

Deal found 3/31

$539

Sun 4/207:30 pmLHR - ORD

1 stop23h 50mAustrian Airlines

Thu 5/1511:10 amORD - LHR

1 stop13h 45mAustrian Airlines

Deal found 3/31

$540

Tue 4/227:25 amLHR - ORD

1 stop12h 30mLufthansa

Thu 5/156:05 pmORD - LHR

Nonstop8h 15mLufthansa

Deal found 3/31

$541

Tue 5/63:40 pmLGW - ORD

1 stop32h 35mIcelandair

Mon 5/1910:15 pmORD - LGW

1 stop10h 20mIcelandair

Deal found 3/31

$543

Wed 5/148:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Wed 5/215:55 pmORD - LHR

1 stop31h 00mUnited Airlines

Deal found 3/30

$543

Sat 4/267:40 amLHR - ORD

1 stop12h 20mBritish Airways

Sat 5/35:45 pmORD - LHR

Nonstop7h 35mBritish Airways

Deal found 3/29

$544

Mon 5/122:00 pmLGW - ORD

2 stops24h 50mMultiple Airlines

Wed 5/145:51 amORD - LGW

1 stop18h 29mMultiple Airlines

Deal found 3/31

$545

Tue 9/309:25 pmLHR - ORD

1 stop26h 50mIcelandair

Thu 10/167:25 pmORD - LHR

1 stop10h 30mIcelandair

Deal found 3/31

$547

Tue 4/228:15 amSTN - ORD

2 stops16h 00mMultiple Airlines

Mon 4/287:25 pmORD - STN

2 stops14h 40mMultiple Airlines

Deal found 3/30

$547

Tue 4/298:45 amLCY - ORD

1 stop17h 10mMultiple Airlines

Sun 5/46:35 pmORD - LCY

1 stop11h 55mMultiple Airlines

Deal found 3/30

$555

Fri 5/23:05 pmLGW - ORD

2 stops25h 32mFinnair

Sun 5/410:10 pmORD - LGW

2 stops28h 00mFinnair

Deal found 3/30

$559

Wed 4/239:25 amLCY - ORD

1 stop12h 30mSWISS

Tue 5/66:35 pmORD - LCY

1 stop16h 55mSWISS

Deal found 3/30

$560

Best flights from United Kingdom to Illinois
Discover carefully curated flight deals from United Kingdom to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 31, 2025.

Tue 4/226:00 amLHR - ORD

1 stop12h 10mMultiple Airlines

Mon 4/286:05 pmORD - LHR

Nonstop8h 15mMultiple Airlines

Deal found 3/31

$539

Sun 4/207:30 pmLHR - ORD

1 stop23h 50mAustrian Airlines

Sun 4/2711:15 amORD - LHR

1 stop13h 40mAustrian Airlines

Deal found 3/31

$540

Tue 4/227:25 amLHR - ORD

1 stop12h 30mUnited Airlines

Mon 4/281:28 pmORD - LHR

1 stop11h 27mUnited Airlines

Deal found 3/31

$541

Tue 5/63:40 pmLGW - ORD

1 stop32h 35mIcelandair

Mon 5/1910:15 pmORD - LGW

1 stop10h 20mIcelandair

Deal found 3/31

$543

Sat 4/267:40 amLHR - ORD

1 stop12h 20mBritish Airways

Sat 5/35:45 pmORD - LHR

Nonstop7h 35mBritish Airways

Deal found 3/29

$544

Sat 4/196:30 amLHR - ORD

1 stop14h 15mLufthansa

Fri 5/26:05 pmORD - LHR

Nonstop8h 15mLufthansa

Deal found 3/31

$553

Fri 5/23:05 pmLGW - ORD

2 stops25h 32mFinnair

Sun 5/410:10 pmORD - LGW

2 stops28h 00mFinnair

Deal found 3/30

$559

Wed 4/239:25 amLCY - ORD

1 stop12h 30mSWISS

Tue 5/66:35 pmORD - LCY

1 stop16h 55mSWISS

Deal found 3/30

$560

Sun 4/208:45 amLHR - ORD

2 stops16h 45mAir Canada

Sun 4/277:20 amORD - LHR

1 stop20h 40mAir Canada

Deal found 3/31

$565

Mon 4/2811:45 amLHR - MDW

1 stop12h 35mVirgin Atlantic

Mon 5/54:59 pmMDW - LHR

1 stop12h 11mVirgin Atlantic

Deal found 3/31

$566

Fri 5/911:45 amLHR - MDW

1 stop13h 00mKLM

Mon 5/1212:48 pmMDW - LHR

1 stop11h 57mKLM

Deal found 3/30

$573

Tue 4/223:15 pmLHR - MDW

1 stop13h 07mAir France

Mon 4/283:02 pmMDW - LHR

1 stop11h 53mAir France

Deal found 3/30

$574

Last-minute flights from United Kingdom to Illinois
Discover last-minute flight deals from United Kingdom to Illinois. Data last updated March 31, 2025 and is based on user searches.

Mon 4/75:10 pmLHR - ORD

1 stop25h 00mMultiple Airlines

Mon 4/146:05 pmORD - LHR

1 stop9h 55mMultiple Airlines

Deal found 3/30

$652

Tue 4/810:35 pmSTN - ORD

2 stops25h 45mMultiple Airlines

Tue 4/157:25 pmORD - STN

2 stops16h 45mMultiple Airlines

Deal found 3/30

$627

Tue 4/89:35 pmLGW - ORD

2 stops26h 45mMultiple Airlines

Tue 4/157:25 pmORD - LGW

2 stops13h 45mMultiple Airlines

Deal found 3/30

$659

Tue 4/811:05 amLHR - ORD

Nonstop9h 05mBrussels Airlines

Tue 4/224:10 pmORD - LHR

1 stop35h 30mBrussels Airlines

Deal found 3/31

$729

Wed 4/91:30 pmLHR - ORD

1 stop12h 25mLufthansa

Thu 5/14:05 pmORD - LHR

Nonstop8h 15mLufthansa

Deal found 3/30

$616

Wed 4/98:30 amLHR - ORD

1 stop12h 15mUnited Airlines

Thu 5/112:59 pmORD - LHR

1 stop11h 46mUnited Airlines

Deal found 3/30

$617

Wed 4/92:25 pmLHR - ORD

Nonstop8h 35mAmerican Airlines

Thu 5/15:45 pmORD - LHR

Nonstop7h 35mAmerican Airlines

Deal found 3/30

$644

Wed 4/98:40 amLHR - ORD

2 stops15h 39mDelta

Thu 5/111:15 amORD - LHR

1 stop13h 30mDelta

Deal found 3/30

$657

Wed 4/99:55 amLHR - ORD

1 stop10h 45mVirgin Atlantic

Wed 4/1612:15 pmORD - LHR

1 stop18h 55mVirgin Atlantic

Deal found 3/30

$683

Wed 4/97:40 amLHR - ORD

1 stop12h 20mBritish Airways

Wed 4/165:45 pmORD - LHR

Nonstop7h 35mBritish Airways

Deal found 3/30

$686

Wed 4/98:40 amLHR - MDW

2 stops15h 22mDelta

Wed 4/169:52 amMDW - LHR

1 stop15h 23mDelta

Deal found 3/31

$733

Wed 4/97:45 amLCY - ORD

2 stops15h 42mVirgin Atlantic

Wed 4/164:50 pmORD - LCY

1 stop17h 50mVirgin Atlantic

Deal found 3/30

$750

One-way flights from United Kingdom to Illinois
Search for one-way flight options from United Kingdom to Illinois. Find affordable one-way fares based on user searches. Data last updated March 31, 2025.

Sun 5/119:35 amEDI - ORD

3 stops32h 15mMultiple Airlines

Deal found 3/30

$320

Fri 9/52:00 pmLGW - ORD

1 stop30h 15mMultiple Airlines

Deal found 3/30

$438

Tue 4/2211:40 amSTN - ORD

3 stops42h 40mMultiple Airlines

Deal found 3/31

$446

Wed 4/238:50 amLCY - ORD

3 stops59h 36mMultiple Airlines

Deal found 3/30

$448

Fri 5/21:45 pmLHR - ORD

2 stops23h 18mMultiple Airlines

Deal found 3/31

$450

Wed 8/136:15 amLTN - ORD

3 stops38h 59mMultiple Airlines

Deal found 3/31

$452

Wed 5/146:00 amLHR - ORD

1 stop16h 10mTAP AIR PORTUGAL

Deal found 3/30

$459

Tue 5/139:25 pmLHR - MDW

2 stops47h 20mMultiple Airlines

Deal found 3/31

$472

Thu 5/222:50 pmLGW - ORD

1 stop31h 20mTAP AIR PORTUGAL

Deal found 3/30

$479

Sun 9/73:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 3/30

$486

Tue 7/298:55 pmMAN - ORD

2 stops42h 45mMultiple Airlines

Deal found 3/30

$494

Mon 4/211:25 pmLHR - ORD

1 stop11h 35mAer Lingus

Deal found 3/30

$520

Cheapflights Fare Finder

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

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 4/22

6:00 am-12:10 pm

1 stop12h 10m

Chicago O'Hare Intl

Mon 4/28

6:05 pm-8:20 am

Nonstop8h 15m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 4/20

7:30 pm-1:20 pm

1 stop23h 50m

Chicago O'Hare Intl

Sun 4/27

11:15 am-6:55 am

1 stop13h 40m

$540

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 4/22

7:25 am-1:55 pm

1 stop12h 30m

Chicago O'Hare Intl

Mon 4/28

1:28 pm-6:55 am

1 stop11h 27m

$541

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 5/6

3:40 pm-6:15 pm

1 stop32h 35m

Chicago O'Hare Intl

Mon 5/19

10:15 pm-2:35 pm

1 stop10h 20m

$543

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/26

7:40 am-2:00 pm

1 stop12h 20m

Chicago O'Hare Intl

Sat 5/3

5:45 pm-7:20 am

Nonstop7h 35m

$544

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 5/12

2:00 pm-8:50 am

2 stops24h 50m

Chicago O'Hare Intl

Wed 5/14

5:51 am-6:20 am

1 stop18h 29m

$545

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 4/22

8:15 am-6:15 pm

2 stops16h 00m

Chicago O'Hare Intl

Mon 4/28

7:25 pm-4:05 pm

2 stops14h 40m

$547

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/19

6:30 am-2:45 pm

1 stop14h 15m

Chicago O'Hare Intl

Fri 5/2

6:05 pm-8:20 am

Nonstop8h 15m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 4/15

9:25 pm-6:15 pm

1 stop26h 50m

Chicago O'Hare Intl

Tue 4/29

7:25 pm-8:20 pm

1 stop18h 55m

$556

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 5/2

3:05 pm-10:37 am

2 stops25h 32m

Chicago O'Hare Intl

Sun 5/4

10:10 pm-8:10 am

2 stops28h 00m

$559

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 60 results

...

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 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 the United Kingdom to Illinois

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

Currently, August is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $245). Flying from United Kingdom to Illinois in March is currently the most expensive (average of $323). 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?

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

Weekly flight availability from United Kingdom to Illinois

The most flights from GB0 to USIL are scheduled on a Sunday (54 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (39 on average).

Rainfall in Illinois by month

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from United Kingdom to Illinois, such as Delta, KLM and LOT. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,899 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very good

7,899 reviews

Delta

8.0

Very good

7,899 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,321 reviews

Delta

8.0

Very good

7,899 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

LOT

7.6

Good

1,065 reviews

Delta

8.0

Very good

7,899 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,267 reviews

Delta

8.0

Very good

7,899 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Austrian Airlines

7.6

Good

770 reviews

Delta

8.0

Very good

7,899 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What are the cheapest airlines to fly from United Kingdom to Illinois one-way?
$459 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on Icelandair and Aer Lingus, with prices starting from $486 and $520, 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 vacation 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, August is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $245). Flying from United Kingdom to Illinois in March is currently the most expensive (average of $323). 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 United Kingdom to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$451	Average$659	FlexibilityNo cancel fee	On-time76%
TAP AIR PORTUGAL	Cheapest$483	Average$677	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$492	Average$675	FlexibilityNo cancel fee	On-time77%
Aer Lingus	Cheapest$543	Average$837	FlexibilityNo cancel fee	On-timeN/A
British Airways	Cheapest$559	Average$859	FlexibilityNo cancel fee	On-time70%
United Airlines	Cheapest$562	Average$921	FlexibilityNo cancel fee	On-time69%
Iberia	Cheapest$582	Average$777	FlexibilityNo cancel fee	On-time77%
American Airlines	Cheapest$588	Average$792	FlexibilityNo cancel fee	On-time71%
Finnair	Cheapest$613	Average$838	FlexibilityNo cancel fee	On-time76%
Lufthansa	Cheapest$660	Average$1,068	FlexibilityNo cancel fee	On-time76%

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$320+ Cheap flights from the United Kingdom to Illinois

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 5/11. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from United Kingdom to Illinois with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap 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 March 31, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from United Kingdom to Illinois

Cheapest flights from United Kingdom to IllinoisExplore 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 March 31, 2025.

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 March 31, 2025.

Cheapflights Fare Finder

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

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.

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?

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 March 31, 2025.

Weekly flight availability from United Kingdom to Illinois

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from United Kingdom to Illinois, such as Delta, KLM and LOT. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

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

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

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

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 United Kingdom to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from United Kingdom to Illinois

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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 March 31, 2025.