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

£254 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on JetBlue and Porter Airlines, with prices starting from £260 and £262, 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 £1,672, our data indicates the cheapest price to be £286. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £314.

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: Royal Jordanian (70%), Air Canada (67%), Austrian Airlines (67%).

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: American Airlines, Finnair or British Airways.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 49 days in advance, which can save you up to 5% on flights from Illinois to London compared to booking the week you need them. Waiting 49 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at £525. For sooner than that we have options available in the next 3 days from £525.

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

Flights from Illinois to London lean towards being more expensive in June. Prices are generally better when you fly from Illinois to London in February, with the cheapest ticket starting at £347.

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.

£176+ Flights from Illinois to London

Cheap flight deals from Illinois to London

Round-trip from	£457
One-way from	£176
Popular in	June
Cheapest in	February
Average price	£761
Good round-trip deal	£577 or less
Good one-way deal	£317 or less

British Airways
12/10-22/10
Nonstop
16h 30m total
Illinois to London

Search Deals

19/7
1 total stop
17h 15m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£111 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£19 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 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

Find flight deals from Illinois to London

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 11 July 2025.

Sun 12/1016:55ORD - LHR

Nonstop7h 55mBritish Airways

Wed 22/1012:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 11/7£457

Thu 13/1119:05ORD - LCY

1 stop11h 45mSWISS

Tue 18/1109:15LCY - ORD

1 stop13h 00mSWISS

Deal found 10/7£457

Mon 28/719:25ORD - LGW

1 stop10h 20mIcelandair

Fri 8/815:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 11/7£457

Mon 22/919:15ORD - STN

1 stop15h 00mMultiple Airlines

Mon 6/1008:00STN - ORD

1 stop14h 10mMultiple Airlines

Deal found 10/7£458

Sun 20/719:25ORD - LHR

1 stop10h 30mIcelandair

Wed 17/913:05LHR - ORD

1 stop11h 10mIcelandair

Deal found 10/7£459

Tue 5/813:24ORD - LGW

2 stops12h 46mAmerican Airlines

Tue 26/810:40LGW - ORD

2 stops18h 19mAmerican Airlines

Deal found 11/7£459

Sat 16/818:05ORD - LHR

Nonstop8h 15mUnited Airlines

Mon 25/811:05LHR - ORD

Nonstop9h 05mUnited Airlines

Deal found 10/7£460

Thu 14/816:15ORD - LCY

1 stop10h 35mDelta

Thu 21/807:45LCY - ORD

1 stop12h 25mDelta

Deal found 10/7£460

Tue 2/922:15ORD - LGW

1 stop10h 25mMultiple Airlines

Mon 22/909:50LGW - ORD

2 stops24h 56mMultiple Airlines

Deal found 9/7£460

Fri 19/916:20ORD - LCY

1 stop11h 10mKLM

Tue 30/909:20LCY - ORD

1 stop10h 50mKLM

Deal found 9/7£461

Wed 23/715:00ORD - LGW

1 stop14h 15mITA Airways

Tue 16/912:05LGW - ORD

1 stop31h 05mITA Airways

Deal found 10/7£461

Thu 11/922:30ORD - LCY

1 stop11h 55mMultiple Airlines

Thu 18/909:25LCY - ORD

1 stop12h 30mMultiple Airlines

Deal found 9/7£462

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 11 July 2025.

Sun 12/1016:55ORD - LHR

Nonstop7h 55mBritish Airways

Wed 22/1012:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 11/7£457

Thu 13/1119:05ORD - LCY

1 stop11h 45mSWISS

Tue 18/1109:15LCY - ORD

1 stop13h 00mSWISS

Deal found 10/7£457

Mon 28/719:25ORD - LGW

1 stop10h 20mIcelandair

Fri 8/815:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 11/7£457

Mon 22/919:15ORD - STN

1 stop15h 00mMultiple Airlines

Mon 6/1008:00STN - ORD

1 stop14h 10mMultiple Airlines

Deal found 10/7£458

Tue 5/813:24ORD - LGW

2 stops12h 46mAmerican Airlines

Tue 26/810:40LGW - ORD

2 stops18h 19mAmerican Airlines

Deal found 11/7£459

Sat 16/818:05ORD - LHR

Nonstop8h 15mUnited Airlines

Sat 23/814:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 10/7£460

Thu 14/816:15ORD - LCY

1 stop10h 35mDelta

Thu 21/807:45LCY - ORD

1 stop12h 25mDelta

Deal found 10/7£460

Fri 19/916:20ORD - LCY

1 stop11h 10mKLM

Tue 30/909:20LCY - ORD

1 stop10h 50mKLM

Deal found 9/7£461

Wed 23/715:00ORD - LGW

1 stop14h 15mITA Airways

Tue 16/912:05LGW - ORD

1 stop31h 05mITA Airways

Deal found 10/7£461

Fri 22/812:43MDW - LHR

1 stop18h 47mVirgin Atlantic

Sun 31/806:30LHR - MDW

2 stops18h 07mVirgin Atlantic

Deal found 10/7£466

Wed 8/1018:00ORD - LGW

2 stops20h 30mTAP AIR PORTUGAL

Wed 15/1016:25LGW - ORD

1 stop26h 10mTAP AIR PORTUGAL

Deal found 10/7£467

Sun 12/1022:30ORD - LCY

1 stop14h 05mLufthansa

Tue 21/1008:45LCY - ORD

1 stop17h 10mLufthansa

Deal found 8/7£467

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 11 July 2025.

Sun 12/1016:55ORD - LHR

Nonstop7h 55mBritish Airways

Wed 22/1012:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 11/7£457

Sat 16/818:05ORD - LHR

Nonstop8h 15mUnited Airlines

Sat 23/814:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 10/7£460

Mon 21/722:30ORD - LHR

Nonstop7h 45mIberia

Mon 18/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 9/7£464

Wed 10/922:35ORD - LHR

Nonstop7h 40mFinnair

Wed 8/1012:15LHR - ORD

Nonstop8h 35mFinnair

Deal found 10/7£474

Fri 1/816:55ORD - LHR

Nonstop7h 55mAmerican Airlines

Wed 6/815:30LHR - ORD

Nonstop8h 45mAmerican Airlines

Deal found 8/7£490

Last-minute flights from Illinois to London
Discover last-minute flight deals from Illinois to London. Data last updated 11 July 2025 and is based on user searches.

Fri 18/708:09ORD - LGW

1 stop16h 46mMultiple Airlines

Mon 18/810:00LGW - ORD

1 stop29h 22mMultiple Airlines

Deal found 10/7£501

Sat 19/721:13ORD - LHR

1 stop28h 27mBritish Airways

Sat 16/813:10LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 9/7£475

Sat 19/716:05STL - LHR

1 stop32h 30mAir Canada

Tue 29/709:30LHR - STL

1 stop16h 30mAir Canada

Deal found 10/7£497

Sun 20/719:25ORD - LHR

1 stop10h 30mIcelandair

Fri 19/913:05LHR - ORD

1 stop11h 10mIcelandair

Deal found 10/7£459

Sun 20/722:30ORD - LHR

Nonstop7h 45mIberia

Mon 25/812:15LHR - ORD

Nonstop8h 25mIberia

Deal found 9/7£464

Sun 20/719:01ORD - LHR

2 stops12h 49mDelta

Wed 20/811:45LHR - ORD

2 stops16h 09mDelta

Deal found 9/7£470

Sun 20/716:15ORD - LCY

1 stop10h 35mDelta

Wed 20/809:20LCY - ORD

1 stop11h 20mDelta

Deal found 10/7£478

Sun 20/716:15ORD - LCY

1 stop11h 15mKLM

Wed 20/809:20LCY - ORD

1 stop11h 20mKLM

Deal found 9/7£478

Sun 20/722:15ORD - LGW

1 stop10h 25mIcelandair

Mon 25/815:40LGW - ORD

1 stop32h 35mIcelandair

Deal found 10/7£493

Sun 20/718:00ORD - LGW

2 stops20h 25mTAP AIR PORTUGAL

Wed 20/816:25LGW - ORD

1 stop26h 10mTAP AIR PORTUGAL

Deal found 10/7£502

Mon 21/718:05ORD - LHR

Nonstop8h 15mUnited Airlines

Wed 17/908:40LHR - ORD

1 stop13h 15mUnited Airlines

Deal found 10/7£463

Mon 21/713:09MDW - LHR

1 stop13h 46mDelta

Mon 18/808:40LHR - MDW

2 stops15h 57mDelta

Deal found 9/7£474

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 11 July 2025.

Sat 19/710:45STL - LGW

1 stop17h 15mMultiple Airlines

Deal found 11/7£176

Sun 19/1008:44STL - LHR

3 stops21h 11mMultiple Airlines

Deal found 9/7£202

Wed 17/919:25ORD - LHR

1 stop18h 55mIcelandair

Deal found 11/7£254

Wed 17/919:25ORD - LGW

1 stop13h 15mIcelandair

Deal found 11/7£254

Tue 12/822:15ORD - STN

2 stops16h 25mMultiple Airlines

Deal found 11/7£254

Sat 9/805:05ORD - LHR

2 stops22h 25mMultiple Airlines

Deal found 10/7£255

Thu 14/820:50ORD - LTN

2 stops19h 00mMultiple Airlines

Deal found 11/7£255

Mon 8/913:59MDW - LHR

2 stops15h 56mMultiple Airlines

Deal found 10/7£255

Mon 8/913:59MDW - LGW

2 stops15h 46mMultiple Airlines

Deal found 10/7£255

Sat 15/1117:10ORD - LCY

2 stops19h 25mMultiple Airlines

Deal found 11/7£256

Thu 20/1119:32ORD - LGW

2 stops28h 28mMultiple Airlines

Deal found 11/7£258

Fri 28/1113:41ORD - LHR

1 stop13h 49mJetBlue

Deal found 10/7£260

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 12/10

16:55-06:50

Nonstop7h 55m

London Heathrow

Wed 22/10

12:15-14:50

Nonstop8h 35m

£457

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Thu 13/11

19:05-12:50

1 stop11h 45m

London City

Tue 18/11

09:15-16:15

1 stop13h 00m

£457

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 28/7

19:25-11:45

1 stop10h 20m

London Gatwick

Fri 8/8

15:40-21:15

1 stop11h 35m

£457

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Mon 22/9

19:15-16:15

1 stop15h 00m

London Stansted

Mon 6/10

08:00-16:10

1 stop14h 10m

£458

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Tue 5/8

13:24-08:10

2 stops12h 46m

London Gatwick

Tue 26/8

10:40-22:59

2 stops18h 19m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 21/7

19:25-11:55

1 stop10h 30m

London Heathrow

Wed 17/9

13:05-18:15

1 stop11h 10m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 16/8

18:05-08:20

Nonstop8h 15m

London Heathrow

Sat 23/8

14:10-17:20

Nonstop9h 10m

£460

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Thu 14/8

16:15-08:50

1 stop10h 35m

London City

Wed 20/8

09:20-14:40

1 stop11h 20m

£460

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Tue 2/9

22:15-14:40

1 stop10h 25m

London Gatwick

Mon 22/9

09:50-04:46

2 stops24h 56m

£460

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Fri 19/9

16:20-09:30

1 stop11h 10m

London City

Tue 30/9

09:20-14:10

1 stop10h 50m

£461

Flights are sorted by cheapest return flights first.

Deals found on 11/7

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, January is the cheapest month in which you can book a flight from Illinois to London (average of £112). Flying from Illinois to London in August is currently the most expensive (average of £164). 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?

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

Weekly flight availability from Illinois to London

The most flights from USIL to LON are scheduled on a Monday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (52 on average).

Reviews of airlines servicing London

Get a feel of what it's like to fly with Delta, Porter Airlines, andKLM from Illinois to London by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,951 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,951 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Porter Airlines

8.0

Very Good

304 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,372 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Austrian Airlines

7.6

Good

811 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Air France

7.5

Good

1,467 reviews

Delta

8.0

Very Good

7,951 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines to fly from Illinois to London one-way?
£254 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on JetBlue and Porter Airlines, with prices starting from £260 and £262, 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: Royal Jordanian (70%), Air Canada (67%), Austrian Airlines (67%).
What are the cheapest flights from Illinois to London?
Looking for the cheapest flight from Illinois to London? While on average our users pay £1,672, our data indicates the cheapest price to be £286. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £314.
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, January is the cheapest month in which you can book a flight from Illinois to London (average of £112). Flying from Illinois to London in August is currently the most expensive (average of £164). 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

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Croydon

Milton Keynes

Deal

Gatwick

Slough

Luton

Wembley

Crawley

Eastbourne

Ilford

Hayes

Ipswich

Folkestone

Southend-on-Sea

Watford

Winchester

Maidstone

Guildford

Chichester

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
Aer Lingus	Cheapest£406	Average£573	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£409	Average£594	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£441	Average£563	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
United Airlines	Cheapest£457	Average£693	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£459	Average£637	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£479	Average£797	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£507	Average£752	FlexibilityNo cancel fee	On-time71%	Search American 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 £176

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 19/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated 11 July 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to 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 11 July 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 11 July 2025.

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 11 July 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 11 July 2025.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 11 July 2025.

Get a feel of what it's like to fly with Delta, Porter Airlines, andKLM from Illinois to London by reading reviews from past customers. You can also see how each airline compares 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 Illinois to London. 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 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?

Travelling to a place near 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 Illinois to London

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

Top 7 airlines flying from Illinois to London

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

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

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

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

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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 11 July 2025.