How long is the flight from Illinois to London?

Departing from Illinois to London will take you 8h 05m. Illinois and London are separated by a distance of 3939 mi. This flight may include one or multiple stops.

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

£166 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 United Airlines and Lufthansa, with prices starting from £261 and £278, respectively.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Illinois to London?

When deciding which route to take from Illinois to London consider Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City as they are the most popular.

What are the cheapest flights from Illinois to London?

Looking for the cheapest flight from Illinois to London? While on average our users pay £506, our data indicates the cheapest price to be £295. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £327.

What are the most reliable airlines from Illinois to London?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to London on time: Air Canada (64%), Austrian Airlines (64%), United Airlines (64%).

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

Before booking your flight from Illinois to London check out the most popular airlines for this route: British Airways, Iberia or Finnair.

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

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

How can I find direct flights from Illinois to London?

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

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

Yes. Cheapflights offers flight deals from Illinois to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£126+ Flights from Illinois to London

Cheap flight deals from Illinois to London

Enter your travel dates to find the best prices.

Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 December 2025.

Mon 15/1218:30ORD - LHR

1 stop19h 00mIcelandair

Mon 12/120:35LHR - ORD

1 stop26h 45mIcelandair

Deal found 7/12£430

Wed 10/1214:40ORD - LHR

1 stop13h 00mMultiple Airlines

Fri 16/106:00LHR - ORD

1 stop12h 45mMultiple Airlines

Deal found 7/12£438

Mon 8/1213:05ORD - LHR

1 stop11h 35mMultiple Airlines

Thu 25/1206:00LHR - ORD

1 stop12h 45mMultiple Airlines

Deal found 6/12£440

Sun 7/1213:05ORD - LHR

1 stop11h 35mAustrian Airlines

Wed 24/1206:00LHR - ORD

1 stop14h 00mAustrian Airlines

Deal found 6/12£442

Mon 8/1217:50ORD - LHR

Nonstop8h 05mMultiple Airlines

Tue 16/1206:00LHR - ORD

1 stop12h 45mMultiple Airlines

Deal found 7/12£451

Tue 9/1213:05ORD - LHR

1 stop11h 35mAustrian Airlines

Tue 16/1216:20LHR - ORD

1 stop32h 11mAustrian Airlines

Deal found 7/12£451

Sun 7/1220:25ORD - LGW

1 stop13h 20mTAP AIR PORTUGAL

Tue 16/1210:40LGW - ORD

1 stop34h 20mTAP AIR PORTUGAL

Deal found 6/12£452

Wed 10/1218:30ORD - LGW

1 stop10h 25mIcelandair

Tue 31/315:40LGW - ORD

1 stop32h 35mIcelandair

Deal found 6/12£453

Mon 8/1219:40ORD - LHR

1 stop11h 45mAer Lingus

Tue 16/1208:50LHR - ORD

1 stop11h 10mAer Lingus

Deal found 7/12£454

Mon 8/1213:05ORD - LHR

1 stop11h 35mAustrian Airlines

Tue 16/1216:20LHR - ORD

1 stop32h 11mAustrian Airlines

Deal found 7/12£455

Sun 7/1213:05ORD - LHR

1 stop11h 35mAustrian Airlines

Tue 16/1216:20LHR - ORD

1 stop32h 11mAustrian Airlines

Deal found 5/12£456

Mon 8/1218:50ORD - LHR

1 stop15h 30mSWISS

Tue 16/1206:00LHR - ORD

1 stop12h 45mSWISS

Deal found 7/12£459

Best flights from Illinois to London
Discover carefully curated flight deals from Illinois to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 December 2025.

Thu 26/219:20ORD - LTN

2 stops20h 50mMultiple Airlines

Wed 4/320:50LTN - ORD

2 stops25h 55mMultiple Airlines

Deal found 7/12£417

Fri 6/307:00ORD - LHR

2 stops20h 20mScandinavian Airlines

Sun 15/310:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Deal found 7/12£428

Thu 14/519:25ORD - LGW

1 stop13h 15mIcelandair

Thu 21/513:00LGW - ORD

1 stop11h 15mIcelandair

Deal found 7/12£434

Tue 13/117:50ORD - LHR

Nonstop8h 05mUnited Airlines

Fri 30/106:50LHR - ORD

1 stop11h 20mUnited Airlines

Deal found 5/12£464

Tue 17/312:50ORD - STN

1 stop16h 00mTurkish Airlines

Mon 23/310:50STN - ORD

1 stop29h 15mTurkish Airlines

Deal found 6/12£475

Wed 7/113:28MDW - LHR

1 stop13h 17mDelta

Wed 21/108:40LHR - MDW

2 stops15h 56mDelta

Deal found 6/12£477

Wed 28/119:10ORD - LGW

1 stop13h 55mTAP AIR PORTUGAL

Fri 6/221:25LGW - ORD

2 stops47h 20mTAP AIR PORTUGAL

Deal found 8/12£478

Tue 20/113:31MDW - LHR

2 stops14h 44mVirgin Atlantic

Tue 27/106:30LHR - MDW

2 stops16h 59mVirgin Atlantic

Deal found 6/12£480

Wed 7/118:10ORD - LGW

2 stops17h 40mSWISS

Thu 22/118:40LGW - ORD

1 stop27h 40mSWISS

Deal found 6/12£484

Wed 1/422:30ORD - LCY

1 stop14h 05mLufthansa

Tue 7/409:15LCY - ORD

1 stop11h 35mLufthansa

Deal found 7/12£491

Wed 1/416:20ORD - LCY

1 stop10h 30mKLM

Tue 7/409:20LCY - ORD

1 stop10h 55mKLM

Deal found 7/12£502

Fri 1/513:30STL - LHR

1 stop11h 00mAir Canada

Wed 6/508:45LHR - STL

2 stops15h 40mAir Canada

Deal found 7/12£502

Mon 5/114:04STL - LCY

2 stops48h 41mBritish Airways

Fri 23/107:50LCY - STL

2 stops20h 54mBritish Airways

Deal found 7/12£610

Sun 15/311:59STL - LGW

2 stops26h 01mIberia

Wed 18/319:40LGW - STL

2 stops32h 18mIberia

Deal found 7/12£798

Sat 14/219:20ORD - LTN

2 stops16h 55mMultiple Airlines

Sun 22/214:35LTN - ORD

2 stops32h 10mMultiple Airlines

Deal found 6/12£433

Fri 15/522:40ORD - LGW

1 stop10h 00mIcelandair

Fri 22/515:40LGW - ORD

1 stop12h 00mIcelandair

Deal found 7/12£434

Sun 1/219:10ORD - LHR

2 stops20h 25mScandinavian Airlines

Thu 5/219:30LHR - ORD

1 stop27h 15mScandinavian Airlines

Deal found 5/12£439

Wed 14/117:50ORD - LHR

Nonstop8h 05mUnited Airlines

Wed 21/106:35LHR - ORD

1 stop13h 35mUnited Airlines

Deal found 6/12£465

Wed 1/419:50ORD - STN

1 stop20h 20mTurkish Airlines

Tue 7/417:45STN - ORD

1 stop21h 55mTurkish Airlines

Deal found 7/12£479

Wed 11/221:55ORD - LTN

1 stop14h 20mMultiple Airlines

Wed 18/208:30LTN - ORD

1 stop17h 30mMultiple Airlines

Deal found 5/12£437

Wed 14/118:10ORD - LGW

2 stops17h 40mSWISS

Wed 21/118:40LGW - ORD

1 stop24h 05mSWISS

Deal found 6/12£484

Wed 8/419:20MDW - LHR

1 stop11h 50mDelta

Wed 15/408:40LHR - MDW

2 stops15h 51mDelta

Deal found 6/12£488

Tue 31/317:38MDW - LHR

1 stop11h 32mVirgin Atlantic

Wed 8/406:30LHR - MDW

2 stops18h 10mVirgin Atlantic

Deal found 7/12£488

Sun 15/320:20ORD - LHR

1 stop17h 10mScandinavian Airlines

Fri 20/306:40LHR - ORD

1 stop16h 05mScandinavian Airlines

Deal found 7/12£445

Tue 31/318:35STL - LCY

2 stops18h 00mLufthansa

Tue 7/409:15LCY - STL

2 stops19h 44mLufthansa

Deal found 5/12£502

Tue 31/316:20ORD - LCY

1 stop10h 30mKLM

Tue 7/407:45LCY - ORD

1 stop12h 30mKLM

Deal found 7/12£502

Wed 20/522:40ORD - LGW

1 stop10h 00mIcelandair

Wed 27/515:40LGW - ORD

1 stop12h 00mIcelandair

Deal found 7/12£459

Wed 7/121:05ORD - LHR

Nonstop8h 10mUnited Airlines

Thu 22/111:10LHR - ORD

1 stop13h 15mUnited Airlines

Deal found 6/12£465

Sun 25/120:25ORD - LGW

2 stops18h 10mTAP AIR PORTUGAL

Thu 29/116:00LGW - ORD

1 stop29h 25mTAP AIR PORTUGAL

Deal found 6/12£514

Thu 2/419:50ORD - STN

1 stop32h 25mTurkish Airlines

Thu 23/417:45STN - ORD

1 stop30h 30mTurkish Airlines

Deal found 6/12£479

Direct flights from Illinois to London
Explore direct flight options from Illinois to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 December 2025.

Mon 9/322:45ORD - LHR

Nonstop7h 50mBritish Airways

Mon 23/314:10LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 7/12£466

Wed 21/117:10ORD - LHR

Nonstop7h 45mBritish Airways

Tue 27/111:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 7/12£469

Tue 13/121:45ORD - LHR

Nonstop7h 50mBritish Airways

Fri 30/111:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 5/12£475

Wed 21/115:45ORD - LHR

Nonstop8h 10mAustrian Airlines

Wed 28/113:35LHR - ORD

Nonstop9h 25mAustrian Airlines

Deal found 7/12£477

Tue 13/121:45ORD - LHR

Nonstop7h 50mBritish Airways

Tue 20/111:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 6/12£478

Mon 12/117:50ORD - LHR

Nonstop8h 05mAustrian Airlines

Wed 21/107:40LHR - ORD

Nonstop9h 20mAustrian Airlines

Deal found 6/12£480

Tue 13/117:10ORD - LHR

Nonstop7h 45mBritish Airways

Tue 3/211:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 7/12£483

Wed 21/117:10ORD - LHR

Nonstop7h 45mBritish Airways

Wed 28/112:35LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 7/12£486

Wed 7/117:50ORD - LHR

Nonstop8h 05mUnited Airlines

Thu 22/107:40LHR - ORD

Nonstop9h 20mUnited Airlines

Deal found 6/12£487

Wed 15/417:40ORD - LHR

Nonstop7h 40mBritish Airways

Wed 29/414:25LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 6/12£487

Wed 29/421:15ORD - LHR

Nonstop8h 00mBritish Airways

Tue 5/515:15LHR - ORD

Nonstop9h 00mBritish Airways

Deal found 6/12£490

Fri 1/522:00STL - LHR

Nonstop8h 05mIberia

Wed 6/516:25LHR - STL

Nonstop9h 05mIberia

Deal found 7/12£532

Last-minute flights from Illinois to London
Discover last-minute flight deals from Illinois to London. Data last updated 8 December 2025 and is based on user searches.

Fri 9/119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Tue 13/119:50LHR - ORD

2 stops26h 55mScandinavian Airlines

Deal found 7/12£418

Sun 11/119:10ORD - LHR

1 stop20h 30mScandinavian Airlines

Sun 18/110:20LHR - ORD

1 stop12h 35mScandinavian Airlines

Deal found 6/12£423

Mon 12/119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Mon 19/107:05LHR - ORD

2 stops15h 40mScandinavian Airlines

Deal found 6/12£421

Fri 16/119:20ORD - LHR

2 stops17h 10mScandinavian Airlines

Sat 24/110:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Deal found 6/12£418

Wed 21/119:20ORD - LHR

2 stops15h 05mScandinavian Airlines

Tue 27/119:50LHR - ORD

2 stops26h 55mScandinavian Airlines

Deal found 6/12£419

Wed 21/117:32ORD - LGW

2 stops34h 28mMultiple Airlines

Fri 30/114:00LGW - ORD

1 stop33h 52mMultiple Airlines

Deal found 5/12£421

Wed 21/119:20ORD - LHR

1 stop17h 10mScandinavian Airlines

Wed 28/107:05LHR - ORD

2 stops15h 40mScandinavian Airlines

Deal found 7/12£422

Wed 21/118:30ORD - LGW

3 stops32h 05mMultiple Airlines

Wed 28/108:50LGW - ORD

2 stops14h 30mMultiple Airlines

Deal found 7/12£422

Thu 22/116:19ORD - LGW

2 stops35h 41mMultiple Airlines

Thu 29/114:00LGW - ORD

1 stop26h 35mMultiple Airlines

Deal found 6/12£420

Fri 23/107:01ORD - LHR

2 stops20h 19mScandinavian Airlines

Sat 31/110:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Deal found 7/12£417

Fri 23/120:15ORD - LGW

1 stop31h 35mTAP AIR PORTUGAL

Sat 31/116:35LGW - ORD

1 stop28h 10mTAP AIR PORTUGAL

Deal found 7/12£418

Thu 29/110:29ORD - LHR

2 stops23h 31mScandinavian Airlines

Fri 6/210:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Deal found 7/12£421

One-way flights from Illinois to London
Search for one-way flight options from Illinois to London. Find affordable one-way fares based on user searches. Data last updated 8 December 2025.

Mon 26/110:16STL - LGW

1 stop17h 44mMultiple Airlines

Deal found 6/12£126

Wed 21/117:42STL - LGW

1 stop34h 18mMultiple Airlines

Deal found 7/12£182

Wed 21/120:22STL - LHR

2 stops34h 28mMultiple Airlines

Deal found 7/12£208

Tue 13/117:11STL - LHR

3 stops40h 19mMultiple Airlines

Deal found 6/12£211

Sun 26/418:35STL - LGW

2 stops21h 50mMultiple Airlines

Deal found 7/12£252

Sat 10/117:11STL - LHR

3 stops47h 29mMultiple Airlines

Deal found 6/12£253

Sat 21/211:55STL - LHR

2 stops22h 05mScandinavian Airlines

Deal found 5/12£258

Mon 4/513:30STL - LGW

2 stops20h 35mMultiple Airlines

Deal found 7/12£259

Mon 26/115:45STL - LHR

2 stops20h 45mScandinavian Airlines

Deal found 6/12£265

Wed 21/117:42STL - LCY

3 stops41h 23mMultiple Airlines

Deal found 7/12£269

Mon 23/317:41STL - LHR

1 stop12h 24mLufthansa

Deal found 5/12£270

Mon 23/309:50STL - LGW

3 stops43h 10mMultiple Airlines

Deal found 6/12£274

Find flight deals from Illinois to London

Round-trip from	£417
One-way from	£126
Popular in	June
Cheapest in	September
Average price	£625
Good round-trip deal	£567 or less
Good one-way deal	£361 or less

Scandinavian Airlines
23/1-31/1
3 total stops
32h 44m total
Illinois to London

Search Deals

26/1
1 total stop
17h 44m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£115 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£20 potential savings vs. average return price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

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

Search Deals

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

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Thu 26/2

19:20-22:10

2 stops20h 50m

London Luton

Wed 4/3

20:50-16:45

2 stops25h 55m

£417

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 6/3

07:00-09:20

2 stops20h 20m

London Heathrow

Sun 15/3

10:20-17:45

1 stop12h 25m

£428

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 14/2

19:20-18:15

2 stops16h 55m

London Luton

Sun 22/2

14:35-16:45

2 stops32h 10m

£433

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 14/5

19:25-14:40

1 stop13h 15m

London Gatwick

Thu 21/5

13:00-18:15

1 stop11h 15m

£434

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 15/5

22:40-14:40

1 stop10h 00m

London Gatwick

Fri 22/5

15:40-21:40

1 stop12h 00m

£434

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 11/2

21:55-18:15

1 stop14h 20m

London Luton

Wed 18/2

08:30-20:00

1 stop17h 30m

£437

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 1/2

19:10-21:35

2 stops20h 25m

London Heathrow

Thu 5/2

19:30-16:45

1 stop27h 15m

£439

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 15/3

20:20-18:30

1 stop17h 10m

London Heathrow

Fri 20/3

06:40-17:45

1 stop16h 05m

£445

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 20/5

22:40-14:40

1 stop10h 00m

London Gatwick

Wed 27/5

15:40-21:40

1 stop12h 00m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 13/1

17:50-07:55

Nonstop8h 05m

London Heathrow

Fri 30/1

06:50-12:10

1 stop11h 20m

£464

Flights are sorted by cheapest return flights first.

Deals found on 6/12

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to London

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

Estimated return 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 London

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

Currently, June is the cheapest month in which you can book a flight from Illinois to London (average of £281). Flying from Illinois to London in July is currently the most expensive (average of £453). 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 LON?

A simple way to save on the total cost of your ticket is to fly from Illinois to London in the afternoon. If you’re flexible enough to do this you can expect to save up to 38% on your trip compared to booking a flight at midday.

Weekly flight availability from Illinois to London

The most flights from USIL to LON are scheduled on a Friday (48 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (39 on average).

Related info for your journey

How long is the flight from Illinois to London?
Departing from Illinois to London will take you 8h 05m. Illinois and London are separated by a distance of 3939 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from Illinois to London one-way?
£166 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 United Airlines and Lufthansa, with prices starting from £261 and £278, respectively.
What are the most popular routes from Illinois to London?
When deciding which route to take from Illinois to London consider Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City as they are the most popular.
What are the most reliable airlines from Illinois to London?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to London on time: Air Canada (64%), Austrian Airlines (64%), United Airlines (64%).
What are the cheapest flights from Illinois to London?
Looking for the cheapest flight from Illinois to London? While on average our users pay £506, our data indicates the cheapest price to be £295. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £327.
Can I find deals for flights from Illinois to London that include hotel bookings?
Yes. In addition to deals on Illinois to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Illinois to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to London.
Can I find deals for business class flights from Illinois to London?
Yes. Cheapflights offers flight deals from Illinois to London 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 London?
Currently, June is the cheapest month in which you can book a flight from Illinois to London (average of £281). Flying from Illinois to London in July is currently the most expensive (average of £453). 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

Milton Keynes

Croydon

Hounslow

Slough

Gatwick

Luton

Ilford

Wembley

Colchester

Brentford

Watford

Hayes

Crawley

Deal

Winchester

Romford

Bedford

Chichester

Guildford

Ipswich

Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from Illinois to London

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£361	Average£521	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£388	Average£617	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Finnair	Cheapest£417	Average£680	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£426	Average£594	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Iberia	Cheapest£449	Average£534	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Aer Lingus	Cheapest£452	Average£583	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
United Airlines	Cheapest£465	Average£700	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from Illinois to London?

Cheapflights helps you search for flights from Illinois to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Illinois to London?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Illinois to London for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Illinois to London with no change fees?

Certainly. Search results for flights to London from Illinois shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Illinois to London become cheaper?

Yes, Cheapflights offers price alerts on Illinois to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Illinois to London from £126

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 26/1. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to London

Cheapest flights from Illinois to LondonExplore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 December 2025.

Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 December 2025.

Find flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated 8 December 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

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

Best time to book a flight from Illinois to London

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

Cheapflights Insights

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

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

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

Find hourly flight availability from Illinois to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 8 December 2025.

Weekly flight availability from Illinois to London

Explore weekly flight availability from Illinois to London. 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 8 December 2025.

Related info for your journey

Find useful and relevant information for your journey from Illinois to London. 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 London?

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

What are the most popular routes from Illinois to London?

What are the most reliable airlines from Illinois to London?

What are the cheapest flights from Illinois to London?

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

How can I find direct flights from Illinois to London?

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

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

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Alternative routes for Illinois to London

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Top 7 airlines flying from Illinois to London

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Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 December 2025.