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

$503 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Aer Lingus and TAP AIR PORTUGAL, with prices starting from $518 and $527, 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 $701 1-2 weeks out and tickets from $818 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 $709. 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.

$585+ Flights from the United Kingdom to Illinois

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Cheap flight deals from United Kingdom to Illinois

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$547 (Kiwi.com)
One-way from	$307 (Kiwi.com)
Popular in	August
Cheapest in	February
Average price	$671
Good round-trip deal	$646 or less
Good one-way deal	$670 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. 13% potential increase in price ($107 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 April 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 April 22, 2025.

Mon 5/56:00 amLHR - ORD

1 stop15h 55mMultiple Airlines

Thu 5/221:04 pmORD - LHR

1 stop11h 51mMultiple Airlines

Deal found 4/21

$547

Thu 8/281:05 pmLHR - ORD

1 stop11h 10mIcelandair

Thu 9/410:15 pmORD - LHR

1 stop16h 05mIcelandair

Deal found 4/21

$548

Fri 5/96:40 pmLGW - ORD

1 stop24h 05mSWISS

Sun 5/116:35 pmORD - LGW

1 stop17h 15mSWISS

Deal found 4/21

$549

Thu 5/157:25 amLHR - ORD

1 stop12h 30mLufthansa

Mon 5/199:45 pmORD - LHR

1 stop16h 55mLufthansa

Deal found 4/21

$550

Fri 5/98:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Mon 5/127:35 amORD - LHR

1 stop18h 05mUnited Airlines

Deal found 4/21

$551

Mon 5/56:00 amLHR - ORD

1 stop13h 20mAustrian Airlines

Mon 5/124:05 pmORD - LHR

Nonstop8h 15mAustrian Airlines

Deal found 4/21

$552

Mon 9/88:05 pmLHR - ORD

1 stop22h 50mSWISS

Tue 9/162:20 pmORD - LHR

1 stop23h 00mSWISS

Deal found 4/21

$553

Fri 5/23:05 pmLGW - ORD

1 stop26h 00mBritish Airways

Thu 5/811:45 amORD - LGW

1 stop14h 25mBritish Airways

Deal found 4/22

$556

Thu 9/116:50 amLHR - ORD

2 stops14h 00mAir Canada

Fri 9/1910:40 amORD - LHR

1 stop13h 50mAir Canada

Deal found 4/21

$558

Sat 5/39:15 amLHR - ORD

Nonstop8h 30mBritish Airways

Wed 5/78:30 pmORD - LHR

Nonstop8h 00mBritish Airways

Deal found 4/21

$561

Wed 5/215:35 pmLGW - ORD

2 stops33h 40mMultiple Airlines

Wed 5/287:25 pmORD - LGW

2 stops16h 25mMultiple Airlines

Deal found 4/21

$563

Thu 5/226:55 amSTN - ORD

2 stops20h 20mMultiple Airlines

Mon 5/267:25 pmORD - STN

2 stops16h 55mMultiple Airlines

Deal found 4/21

$563

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 April 22, 2025.

Mon 5/56:00 amLHR - ORD

1 stop15h 55mMultiple Airlines

Thu 5/221:04 pmORD - LHR

1 stop11h 51mMultiple Airlines

Deal found 4/21

$547

Fri 5/96:40 pmLGW - ORD

1 stop24h 05mSWISS

Sun 5/116:35 pmORD - LGW

1 stop17h 15mSWISS

Deal found 4/21

$549

Thu 5/157:25 amLHR - ORD

1 stop12h 30mLufthansa

Mon 5/199:45 pmORD - LHR

1 stop16h 55mLufthansa

Deal found 4/21

$550

Fri 5/98:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Mon 5/127:35 amORD - LHR

1 stop18h 05mUnited Airlines

Deal found 4/21

$551

Mon 5/56:00 amLHR - ORD

1 stop13h 20mAustrian Airlines

Mon 5/124:05 pmORD - LHR

Nonstop8h 15mAustrian Airlines

Deal found 4/21

$552

Fri 5/23:05 pmLGW - ORD

1 stop26h 00mBritish Airways

Thu 5/811:45 amORD - LGW

1 stop14h 25mBritish Airways

Deal found 4/22

$556

Mon 5/56:30 amLHR - ORD

1 stop13h 40mVirgin Atlantic

Sat 5/106:18 pmORD - LHR

1 stop19h 42mVirgin Atlantic

Deal found 4/21

$569

Mon 9/293:40 pmLGW - ORD

1 stop32h 35mIcelandair

Mon 10/67:25 pmORD - LGW

1 stop13h 10mIcelandair

Deal found 4/22

$571

Sat 9/139:20 amLHR - MDW

1 stop14h 38mAir France

Sat 9/276:50 pmMDW - LHR

1 stop12h 40mAir France

Deal found 4/21

$587

Fri 8/2910:35 amLGW - ORD

1 stop35h 55mTAP AIR PORTUGAL

Thu 9/116:00 pmORD - LGW

1 stop33h 45mTAP AIR PORTUGAL

Deal found 4/22

$590

Mon 5/56:30 amLHR - ORD

1 stop13h 40mDelta

Tue 5/202:45 pmORD - LHR

1 stop13h 15mDelta

Deal found 4/21

$591

Fri 5/212:20 pmLGW - ORD

2 stops17h 29mAmerican Airlines

Thu 5/81:29 pmORD - LGW

2 stops12h 41mAmerican Airlines

Deal found 4/22

$594

Last-minute flights from United Kingdom to Illinois
Discover last-minute flight deals from United Kingdom to Illinois. Data last updated April 22, 2025 and is based on user searches.

Mon 4/288:40 amLHR - ORD

1 stop13h 15mMultiple Airlines

Mon 5/56:05 pmORD - LHR

Nonstop8h 15mMultiple Airlines

Deal found 4/21

$549

Mon 4/286:30 amLHR - ORD

1 stop12h 25mLufthansa

Mon 5/129:20 pmORD - LHR

Nonstop8h 25mLufthansa

Deal found 4/21

$554

Mon 4/288:40 amLHR - MDW

2 stops15h 40mDelta

Mon 5/127:25 pmMDW - LHR

1 stop11h 45mDelta

Deal found 4/21

$596

Tue 4/291:10 pmLHR - ORD

Nonstop8h 45mBritish Airways

Wed 5/78:30 pmORD - LHR

Nonstop8h 00mBritish Airways

Deal found 4/22

$563

Wed 4/309:05 amLHR - ORD

1 stop34h 15mAustrian Airlines

Mon 5/59:20 pmORD - LHR

Nonstop8h 25mAustrian Airlines

Deal found 4/22

$557

Wed 4/3011:45 amLHR - MDW

1 stop12h 35mVirgin Atlantic

Mon 5/51:16 pmMDW - LHR

1 stop17h 54mVirgin Atlantic

Deal found 4/22

$594

Wed 4/306:00 amLHR - ORD

1 stop15h 55mSWISS

Tue 5/62:20 pmORD - LHR

1 stop15h 05mSWISS

Deal found 4/22

$556

Thu 5/16:00 amLHR - ORD

1 stop12h 45mSWISS

Mon 5/56:35 pmORD - LHR

1 stop12h 25mSWISS

Deal found 4/21

$551

Thu 5/11:00 pmLGW - ORD

1 stop11h 15mIcelandair

Mon 5/57:25 pmORD - LGW

1 stop10h 20mIcelandair

Deal found 4/22

$566

Thu 5/18:30 amLHR - ORD

Nonstop9h 05mUnited Airlines

Wed 5/148:40 amORD - LHR

1 stop15h 50mUnited Airlines

Deal found 4/22

$593

Thu 5/16:30 amLHR - ORD

1 stop13h 40mDelta

Thu 5/156:18 pmORD - LHR

1 stop11h 07mDelta

Deal found 4/22

$594

Fri 5/23:05 pmLGW - ORD

1 stop26h 00mBritish Airways

Thu 5/811:45 amORD - LGW

1 stop14h 25mBritish Airways

Deal found 4/22

$556

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 April 22, 2025.

Tue 6/312:25 pmMAN - ORD

2 stops24h 07mMultiple Airlines

Deal found 4/22

$307

Sat 5/246:00 amEDI - ORD

3 stops31h 27mMultiple Airlines

Deal found 4/21

$317

Thu 5/16:30 pmBHX - ORD

2 stops51h 40mMultiple Airlines

Deal found 4/22

$414

Sun 5/410:15 pmLHR - ORD

3 stops38h 48mMultiple Airlines

Deal found 4/22

$502

Sun 7/137:40 amLGW - ORD

2 stops45h 30mMultiple Airlines

Deal found 4/20

$503

Fri 5/92:10 pmLHR - ORD

1 stop32h 34mWestJet

Deal found 4/21

$503

Sat 6/217:00 amLTN - ORD

3 stops35h 39mMultiple Airlines

Deal found 4/21

$503

Thu 5/88:45 pmLHR - MDW

3 stops42h 48mMultiple Airlines

Deal found 4/21

$508

Sun 5/259:40 amEDI - ORD

3 stops17h 41mWestJet

Deal found 4/21

$509

Mon 4/286:45 amSTN - ORD

3 stops30h 18mMultiple Airlines

Deal found 4/21

$512

Tue 5/67:40 amLHR - ORD

1 stop12h 20mAer Lingus

Deal found 4/21

$518

Wed 6/46:45 pmLHR - ORD

1 stop26h 40mTAP AIR PORTUGAL

Deal found 4/22

$527

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

Mon 5/5

6:00 am-3:55 pm

1 stop15h 55m

Chicago O'Hare Intl

Thu 5/22

1:04 pm-6:55 am

1 stop11h 51m

$547

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 8/28

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Thu 9/4

10:15 pm-8:20 pm

1 stop16h 05m

$548

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 5/9

6:40 pm-12:45 pm

1 stop24h 05m

Chicago O'Hare Intl

Sun 5/11

6:35 pm-5:50 pm

1 stop17h 15m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 5/15

7:25 am-1:55 pm

1 stop12h 30m

Chicago O'Hare Intl

Mon 5/19

9:45 pm-8:40 pm

1 stop16h 55m

$550

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 5/9

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Fri 5/23

10:00 am-6:55 am

1 stop14h 55m

$551

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 5/5

6:00 am-1:20 pm

1 stop13h 20m

Chicago O'Hare Intl

Mon 5/12

4:05 pm-6:20 am

Nonstop8h 15m

$552

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 9/8

8:05 pm-12:55 pm

1 stop22h 50m

Chicago O'Hare Intl

Tue 9/16

2:20 pm-7:20 pm

1 stop23h 00m

$553

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 5/2

3:05 pm-11:05 am

1 stop26h 00m

Chicago O'Hare Intl

Thu 5/8

11:45 am-8:10 am

1 stop14h 25m

$556

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/11

6:50 am-2:50 pm

2 stops14h 00m

Chicago O'Hare Intl

Fri 9/19

10:40 am-6:30 am

1 stop13h 50m

$558

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 5/3

9:15 am-11:45 am

Nonstop8h 30m

Chicago O'Hare Intl

Wed 5/7

8:30 pm-10:30 am

Nonstop8h 00m

$561

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/22

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 $321). 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 Monday (56 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (44 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

7,920 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

7,920 reviews

Delta

8.0

Very good

7,920 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

1,331 reviews

Delta

8.0

Very good

7,920 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

7,920 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

1,272 reviews

Delta

8.0

Very good

7,920 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

780 reviews

Delta

8.0

Very good

7,920 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?
$503 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Aer Lingus and TAP AIR PORTUGAL, with prices starting from $518 and $527, 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 $321). 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$661	FlexibilityNo cancel fee	On-time76%
Scandinavian Airlines	Cheapest$462	Average$569	FlexibilityNo cancel fee	On-time77%
TAP AIR PORTUGAL	Cheapest$483	Average$677	FlexibilityNo cancel fee	On-timeN/A
British Airways	Cheapest$551	Average$820	FlexibilityNo cancel fee	On-time70%
Aer Lingus	Cheapest$553	Average$828	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$562	Average$921	FlexibilityNo cancel fee	On-time69%
Iberia	Cheapest$582	Average$776	FlexibilityNo cancel fee	On-time77%
American Airlines	Cheapest$583	Average$798	FlexibilityNo cancel fee	On-time71%
Finnair	Cheapest$613	Average$852	FlexibilityNo cancel fee	On-time76%
Lufthansa	Cheapest$660	Average$1,001	FlexibilityNo cancel fee	On-time76%

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$307+ 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 6/3. 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 April 22, 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 April 22, 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 April 22, 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 April 22, 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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Travel Smart

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 April 22, 2025.