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

To fly one-way, consider booking your trip with Air Transat, which is currently one of the cheapest options available, starting at $456. TAP AIR PORTUGAL flights start at $460 while deals on Icelandair start at $517 one-way.

What are the most popular routes from London to Illinois?

The most popular route from London to Illinois is London Heathrow - Chicago O'Hare Intl. You may also consider London Gatwick - Chicago O'Hare Intl or London City - Chicago O'Hare Intl.

What are the cheapest flights from London to Illinois?

The cheapest flight price from London to Illinois is $549. On average you can expect to pay $2,299. The most popular route, (London Heathrow - Chicago O'Hare Intl), can usually be booked for $482.

What are the most reliable airlines from London to Illinois?

Consider Air Canada (93%), Austrian Airlines (93%) or United Airlines (93%) when booking your flight. These represent the most reliable airlines when flying from London to Illinois.

What are the most popular airlines that fly from London to Illinois?

American Airlines, Finnair and British Airways are the most popular airlines when flying from London to Illinois.

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

Travelers have found it’s best to book a flight 45 days in advance to save up to 17% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 45 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Illinois 1-2 weeks in advance for as low as $684, or $833 for flights within the next 24 hours.

What is the cheapest month to fly from London to Illinois?

The best pricing can be found in the month of February. Prices to Illinois from London average $713. You can even find prices in February for less than $713, as users have found deals to Illinois from as low as $428. The month of August appears to be one of the more expensive times to travel to Illinois from London. Flying in the targeted month can save you up to 26%.

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

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

How can I find direct flights from London to Illinois?

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

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

Yes. Cheapflights offers flight deals from London 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.

$268+ Flights from London to Illinois

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Cheap flight deals from London to Illinois

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$539 (United Airlines)
One-way from	$268 (Trip.com)
Popular in	August
Cheapest in	February
Average price	$640
Good round-trip deal	$685 or less
Good one-way deal	$660 or less

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

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

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From London (LON) to Illinois

Search Deals

One-way flight from London (LON) to Illinois

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($99 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

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Price to beat on a round-trip flight from London (LON) to Illinois.

Search Deals

Price to beat on a one-way flight from London (LON) to Illinois.

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Find flight deals from London to Illinois

Cheapest flights from London to Illinois
Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Sat 5/107:25 amLHR - ORD

1 stop12h 30mUnited Airlines

Wed 5/144:25 pmORD - LHR

1 stop12h 15mUnited Airlines

Deal found 3/27

$539

Fri 9/59:05 amLHR - ORD

1 stop34h 15mAustrian Airlines

Tue 9/164:00 pmORD - LHR

Nonstop8h 20mAustrian Airlines

Deal found 3/28

$540

Tue 4/228:15 amSTN - ORD

2 stops16h 00mMultiple Airlines

Tue 4/297:25 pmORD - STN

2 stops21h 30mMultiple Airlines

Deal found 3/27

$540

Fri 5/1610:00 amLGW - ORD

1 stop37h 41mMultiple Airlines

Tue 5/209:55 amORD - LGW

1 stop15h 05mMultiple Airlines

Deal found 3/27

$541

Wed 7/93:40 pmLGW - ORD

1 stop11h 35mIcelandair

Wed 7/167:25 pmORD - LGW

1 stop10h 20mIcelandair

Deal found 3/28

$542

Sat 4/267:40 amLHR - ORD

1 stop12h 20mBritish Airways

Tue 4/298:20 pmORD - LHR

Nonstop8h 10mBritish Airways

Deal found 3/27

$544

Sat 4/197:30 amLHR - ORD

2 stops16h 56mLufthansa

Wed 5/142:35 pmORD - LHR

1 stop13h 05mLufthansa

Deal found 3/27

$546

Wed 6/41:05 pmLHR - ORD

1 stop11h 10mIcelandair

Wed 6/2510:15 pmORD - LHR

1 stop16h 05mIcelandair

Deal found 3/27

$548

Sat 4/196:30 amLHR - ORD

1 stop14h 15mMultiple Airlines

Fri 5/212:00 pmORD - LHR

1 stop12h 35mMultiple Airlines

Deal found 3/28

$553

Tue 4/228:45 amLCY - ORD

1 stop17h 10mMultiple Airlines

Tue 4/292:20 pmORD - LCY

1 stop12h 30mMultiple Airlines

Deal found 3/27

$556

Thu 5/112:35 pmLTN - ORD

2 stops33h 35mMultiple Airlines

Sun 5/117:15 pmORD - LTN

2 stops20h 15mMultiple Airlines

Deal found 3/26

$556

Fri 5/212:20 pmLGW - ORD

2 stops28h 16mFinnair

Sun 5/410:10 pmORD - LGW

2 stops28h 00mFinnair

Deal found 3/27

$559

Best flights from London to Illinois
Discover carefully curated flight deals from London to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 28, 2025.

Sat 5/107:25 amLHR - ORD

1 stop12h 30mUnited Airlines

Wed 5/144:25 pmORD - LHR

1 stop12h 15mUnited Airlines

Deal found 3/27

$539

Tue 4/228:15 amSTN - ORD

2 stops16h 00mMultiple Airlines

Tue 4/297:25 pmORD - STN

2 stops21h 30mMultiple Airlines

Deal found 3/27

$540

Tue 4/293:40 pmLGW - ORD

1 stop32h 35mIcelandair

Mon 5/57:25 pmORD - LGW

1 stop10h 20mIcelandair

Deal found 3/27

$544

Sat 4/267:40 amLHR - ORD

1 stop12h 20mBritish Airways

Tue 4/298:20 pmORD - LHR

Nonstop8h 10mBritish Airways

Deal found 3/27

$544

Sat 4/197:30 amLHR - ORD

2 stops16h 56mLufthansa

Wed 5/142:35 pmORD - LHR

1 stop13h 05mLufthansa

Deal found 3/27

$546

Sat 4/268:30 amLHR - ORD

Nonstop9h 05mAustrian Airlines

Tue 4/299:20 pmORD - LHR

Nonstop8h 25mAustrian Airlines

Deal found 3/27

$554

Fri 5/212:20 pmLGW - ORD

2 stops28h 16mFinnair

Sun 5/410:10 pmORD - LGW

2 stops28h 00mFinnair

Deal found 3/27

$559

Sat 5/106:30 amLHR - MDW

2 stops15h 51mKLM

Sat 5/176:30 pmMDW - LHR

1 stop12h 40mKLM

Deal found 3/26

$559

Wed 4/239:25 amLCY - ORD

1 stop12h 30mSWISS

Tue 5/62:20 pmORD - LCY

1 stop12h 30mSWISS

Deal found 3/27

$560

Sat 4/2611:45 amLHR - MDW

1 stop12h 35mVirgin Atlantic

Sat 5/34:00 pmMDW - LHR

1 stop13h 10mVirgin Atlantic

Deal found 3/27

$566

Mon 4/289:20 amLHR - MDW

1 stop12h 52mAir France

Tue 5/63:02 pmMDW - LHR

1 stop11h 53mAir France

Deal found 3/27

$571

Sat 4/1912:40 pmLHR - ORD

2 stops25h 22mAir Canada

Sat 5/178:40 amORD - LHR

1 stop19h 20mAir Canada

Deal found 3/27

$572

Last-minute flights from London to Illinois
Discover last-minute flight deals from London to Illinois. Data last updated March 28, 2025 and is based on user searches.

Wed 4/211:45 amLHR - MDW

1 stop12h 17mKLM

Tue 4/82:57 pmMDW - LHR

1 stop11h 58mKLM

Deal found 3/26

$648

Wed 4/28:40 amLHR - MDW

2 stops15h 22mDelta

Tue 4/84:59 pmMDW - LHR

1 stop12h 11mDelta

Deal found 3/26

$656

Wed 4/28:40 amLCY - ORD

1 stop12h 00mKLM

Tue 4/84:50 pmORD - LCY

1 stop10h 40mKLM

Deal found 3/26

$667

Thu 4/38:40 amLHR - ORD

1 stop13h 15mMultiple Airlines

Thu 4/102:35 pmORD - LHR

1 stop13h 05mMultiple Airlines

Deal found 3/27

$592

Thu 4/36:55 amLHR - ORD

1 stop13h 00mLufthansa

Thu 4/102:35 pmORD - LHR

1 stop13h 05mLufthansa

Deal found 3/27

$598

Thu 4/38:40 amLHR - ORD

1 stop11h 30mVirgin Atlantic

Tue 4/81:57 pmORD - LHR

1 stop11h 18mVirgin Atlantic

Deal found 3/27

$604

Thu 4/39:15 amLHR - ORD

Nonstop8h 35mBritish Airways

Thu 4/105:45 pmORD - LHR

Nonstop7h 35mBritish Airways

Deal found 3/27

$606

Thu 4/38:40 amLHR - ORD

1 stop13h 15mUnited Airlines

Sun 4/63:35 pmORD - LHR

1 stop12h 25mUnited Airlines

Deal found 3/27

$610

Thu 4/36:00 amLHR - ORD

1 stop13h 20mAustrian Airlines

Tue 4/84:05 pmORD - LHR

Nonstop8h 15mAustrian Airlines

Deal found 3/27

$613

Thu 4/36:30 amLHR - ORD

2 stops17h 49mDelta

Thu 4/1011:20 amORD - LHR

1 stop20h 10mDelta

Deal found 3/27

$655

Wed 4/99:05 amSTN - ORD

1 stop15h 55mMultiple Airlines

Wed 4/163:45 pmORD - STN

1 stop10h 05mMultiple Airlines

Deal found 3/27

$641

Wed 4/91:00 pmLTN - ORD

1 stop12h 00mMultiple Airlines

Wed 4/169:15 pmORD - LTN

1 stop12h 10mMultiple Airlines

Deal found 3/27

$668

One-way flights from London to Illinois
Search for one-way flight options from London to Illinois. Find affordable one-way fares based on user searches. Data last updated March 28, 2025.

Sun 5/42:00 pmLGW - STL

1 stop16h 06mMultiple Airlines

Deal found 3/26

$268

Tue 4/229:25 pmLHR - ORD

3 stops40h 39mMultiple Airlines

Deal found 3/27

$440

Mon 4/79:20 pmLTN - ORD

3 stops39h 43mMultiple Airlines

Deal found 3/26

$441

Thu 4/248:00 amLGW - MDW

2 stops33h 06mMultiple Airlines

Deal found 3/26

$444

Sat 4/192:00 pmLGW - ORD

1 stop24h 04mMultiple Airlines

Deal found 3/27

$444

Thu 4/106:55 amSTN - ORD

3 stops33h 52mMultiple Airlines

Deal found 3/27

$447

Thu 5/17:35 amLHR - MDW

2 stops33h 34mMultiple Airlines

Deal found 3/27

$452

Fri 4/2512:40 pmLGW - MDW

1 stop29h 20mAir Transat

Deal found 3/27

$456

Thu 6/59:10 pmLHR - STL

2 stops28h 33mMultiple Airlines

Deal found 3/26

$460

Thu 6/57:50 pmLHR - ORD

1 stop26h 20mTAP AIR PORTUGAL

Deal found 3/27

$460

Tue 6/104:25 pmLGW - ORD

1 stop29h 45mTAP AIR PORTUGAL

Deal found 3/27

$462

Thu 5/86:45 amLCY - ORD

3 stops22h 44mMultiple Airlines

Deal found 3/27

$479

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 5/10

7:25 am-1:55 pm

1 stop12h 30m

Chicago O'Hare Intl

Wed 5/14

4:25 pm-10:40 am

1 stop12h 15m

$539

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 4/22

8:15 am-6:15 pm

2 stops16h 00m

Chicago O'Hare Intl

Tue 4/29

7:25 pm-10:55 pm

2 stops21h 30m

$540

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 5/16

10:00 am-5:41 pm

1 stop37h 41m

Chicago O'Hare Intl

Tue 5/20

9:55 am-7:00 am

1 stop15h 05m

$541

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 4/29

3:40 pm-6:15 pm

1 stop32h 35m

Chicago O'Hare Intl

Mon 5/5

7:25 pm-11:45 am

1 stop10h 20m

$544

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/26

7:40 am-2:00 pm

1 stop12h 20m

Chicago O'Hare Intl

Tue 4/29

8:20 pm-10:30 am

Nonstop8h 10m

$544

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/19

7:30 am-6:26 pm

2 stops16h 56m

Chicago O'Hare Intl

Wed 5/14

2:35 pm-9:40 am

1 stop13h 05m

$546

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 6/4

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Wed 6/25

10:15 pm-8:20 pm

1 stop16h 05m

$548

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

12:00 pm-6:35 am

1 stop12h 35m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/26

8:30 am-11:35 am

Nonstop9h 05m

Chicago O'Hare Intl

Tue 4/29

9:20 pm-11:45 am

Nonstop8h 25m

$554

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 5/2

12:20 pm-10:36 am

2 stops28h 16m

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 3/26

Showing 1-10 of 60 results

...

Best time to book a flight from London to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from London 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 London to Illinois

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

Currently, August is the cheapest month in which you can book a flight from London to Illinois (average of $245). Flying from London 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 LON to IL?

When flying from London to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Peruse reviews from past customers who have flown with Delta, KLM and Air Transat from London to Illinois to help guide your decision. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,897 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

7,897 reviews

Delta

8.0

Very good

7,897 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

7,897 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

Air Transat

7.8

Good

381 reviews

Delta

8.0

Very good

7,897 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

1,063 reviews

Delta

8.0

Very good

7,897 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

7,897 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 London to Illinois one-way?
To fly one-way, consider booking your trip with Air Transat, which is currently one of the cheapest options available, starting at $456. TAP AIR PORTUGAL flights start at $460 while deals on Icelandair start at $517 one-way.
What are the most popular routes from London to Illinois?
The most popular route from London to Illinois is London Heathrow - Chicago O'Hare Intl. You may also consider London Gatwick - Chicago O'Hare Intl or London City - Chicago O'Hare Intl.
What are the most reliable airlines from London to Illinois?
Consider Air Canada (93%), Austrian Airlines (93%) or United Airlines (93%) when booking your flight. These represent the most reliable airlines when flying from London to Illinois.
What are the cheapest flights from London to Illinois?
The cheapest flight price from London to Illinois is $549. On average you can expect to pay $2,299. The most popular route, (London Heathrow - Chicago O'Hare Intl), can usually be booked for $482.
Can I find deals for flights from London to Illinois that include hotel bookings?
Yes. In addition to deals on London to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from London to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Illinois.
Can I find deals for business class flights from London to Illinois?
Yes. Cheapflights offers flight deals from London 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 London to Illinois?
Currently, August is the cheapest month in which you can book a flight from London to Illinois (average of $245). Flying from London 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

Alternative routes for London to Illinois

Heathrow to John F Kennedy Intl flights

Heathrow to Newark flights

Gatwick to John F Kennedy Intl flights

London City to John F Kennedy Intl flights

Heathrow to LaGuardia flights

Gatwick to Newark flights

London City to Newark flights

Heathrow to Los Angeles flights

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Heathrow to Boston flights

Gatwick to LaGuardia flights

Stansted to John F Kennedy Intl flights

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Heathrow to Orlando flights

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Stansted to Newark flights

Heathrow to Las Vegas flights

Heathrow to Dulles Intl flights

Heathrow to O'Hare Intl flights

Heathrow to Dallas/Fort Worth flights

Heathrow to Baltimore flights

Gatwick to Boston flights

London City to Los Angeles flights

Heathrow to Hobby flights

Gatwick to Orlando flights

London City to Miami flights

Heathrow to Seattle flights

Manchester to John F Kennedy Intl flights

Heathrow to Atlanta flights

Manchester to Orlando flights

Luton to Stewart flights

Gatwick to Los Angeles flights

Gatwick to Miami flights

Luton to Newark flights

London City to Boston flights

Gatwick to San Francisco flights

Heathrow to George Bush Intcntl flights

London City to San Francisco flights

Gatwick to Las Vegas flights

Luton to Los Angeles flights

Stansted to Boston flights

Edinburgh to Newark flights

Gatwick to Stewart flights

Heathrow to Ontario flights

Manchester to Newark flights

Heathrow to Denver flights

Stansted to Miami flights

Complete your trip

Illinois car rentals

Chicago O'Hare Intl Airport car rentals

Chicago Midway Airport car rentals

Moline Quad-City Airport car rentals

Greater Peoria Airport car rentals

Bloomington-Normal Airport car rentals

Springfield Capital Airport car rentals

Chicago Greater Rockford Airport car rentals

Champaign University-Willard Airport car rentals

Belleville Airport car rentals

Marion Williamson County Airport car rentals

Quincy Regional Airport car rentals

Top 10 airlines flying from London to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$451	Average$587	FlexibilityNo cancel fee	On-time76%
TAP AIR PORTUGAL	Cheapest$483	Average$729	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$492	Average$675	FlexibilityNo cancel fee	On-time77%
American Airlines	Cheapest$562	Average$788	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$562	Average$848	FlexibilityNo cancel fee	On-time69%
British Airways	Cheapest$573	Average$804	FlexibilityNo cancel fee	On-time70%
Aer Lingus	Cheapest$574	Average$739	FlexibilityNo cancel fee	On-timeN/A
Iberia	Cheapest$582	Average$777	FlexibilityNo cancel fee	On-time77%
Finnair	Cheapest$613	Average$838	FlexibilityNo cancel fee	On-time76%
Lufthansa	Cheapest$660	Average$1,067	FlexibilityNo cancel fee	On-time76%

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$268+ Cheap flights from London (LON) 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from London to Illinois with Cheapflights

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Cheap flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated March 28, 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 London to Illinois

Cheapest flights from London to IllinoisExplore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from London to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from London with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London to Illinois

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

What is the cheapest time of day to fly from LON to IL?

Find hourly flight availability from London 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 28, 2025.

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

Peruse reviews from past customers who have flown with Delta, KLM and Air Transat from London to Illinois to help guide your decision. Users can see the overall rating for each airline as well as how each is rated 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 London 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 London to Illinois one-way?

What are the most popular routes from London to Illinois?

What are the most reliable airlines from London to Illinois?

What are the cheapest flights from London to Illinois?

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

How can I find direct flights from London to Illinois?

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

What is the cheapest month to book a flight from London 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 London to Illinois

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

Top 10 airlines flying from London to Illinois

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Cheapest flights from London to Illinois
Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.