What are the cheapest airlines flying from Chicago to London round-trip?

Our cheapest airline available from Chicago to London is British Airways. Our recent data shows that you can find tickets from as low as £447 on this airline. Additional options worth looking into are Icelandair and Scandinavian Airlines, starting at £447 and £449 round-trip. These flights start at 21% lower than the current average price 3 months from now.

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

£257 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 £263 and £264, respectively.

What is the cheapest day to fly from Chicago to London?

Travellers seeking maximum savings on their Chicago to London flight should consider departing on Tuesday mornings when fares are most often at their lowest. Wednesday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

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 Chicago to London?

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

What are the cheapest flights from Chicago to London?

On average you can expect to pay £1,766 for a flight from Chicago to London. The cheapest flight overall is £289 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £318.

What are the most reliable airlines from Chicago 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 Chicago to London on time: Air Canada (66%), Austrian Airlines (66%), United Airlines (66%).

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

Consider American Airlines, Finnair or British Airways when booking your flight. These represent the most popular airlines when flying from Chicago to London.

What is the cheapest day to fly round-trip from Chicago to London?

Users have found that leaving on a Tuesday can be a cost-effective option. It’s possible to save up to 25% on your flight compared to booking on days when demand is much higher.

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

To save on the cost of your flight from Chicago to London, book at least 60 days before your planned departure. Booking around this time can save you about 9% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £526 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £526.

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

Our data shows that February tends to be the cheapest month to fly to London from Chicago. Users have commonly found prices around £573 for the month, but tickets can be as low as £352. Due to multiple factors, prepare for potentially higher prices in June.

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

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

How can I find direct flights from Chicago to London?

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

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

Yes. Cheapflights offers flight deals from Chicago 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.

£252+ Flights from Chicago to London

Cheapflights Tip: The best prices from Chicago to London are usually found in February or January, booked 83 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Chicago to London

Round-trip from	£447
One-way from	£252
Popular in	June
Cheapest in	February
Average price	£777
Good round-trip deal	£518 or less
Good one-way deal	£321 or less

British Airways
26/9-11/10
Nonstop
16h 30m total
Chicago to London

Search Deals

24/10
2 total stops
12h 05m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£114 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£20 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 Chicago (CHI) to London (LON).

Search Deals

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

Search Deals

Find flight deals from Chicago to London

Cheapest flights from Chicago to London
Explore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 July 2025.

Fri 26/916:55ORD - LHR

Nonstop7h 55mBritish Airways

Sat 11/1009:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 16/7£447

Mon 20/1019:25ORD - LGW

1 stop13h 10mIcelandair

Fri 24/1015:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 15/7£447

Thu 4/919:15ORD - LHR

2 stops15h 45mScandinavian Airlines

Sun 14/921:05LHR - ORD

2 stops25h 05mScandinavian Airlines

Deal found 16/7£449

Tue 29/716:30ORD - LGW

1 stop12h 20mIberia

Wed 13/811:35LGW - ORD

1 stop13h 15mIberia

Deal found 15/7£449

Sat 13/910:27ORD - LGW

1 stop14h 33mMultiple Airlines

Sat 20/913:05LGW - ORD

1 stop15h 06mMultiple Airlines

Deal found 15/7£449

Sun 10/816:30ORD - LCY

2 stops19h 35mBritish Airways

Fri 22/807:00LCY - ORD

2 stops16h 14mBritish Airways

Deal found 15/7£451

Sat 18/1011:21MDW - LGW

1 stop16h 39mMultiple Airlines

Sat 1/1114:00LGW - MDW

1 stop23h 44mMultiple Airlines

Deal found 15/7£452

Mon 18/814:20ORD - LCY

1 stop12h 30mSWISS

Thu 28/809:25LCY - ORD

1 stop12h 30mSWISS

Deal found 16/7£452

Wed 8/1015:35ORD - LTN

2 stops23h 05mMultiple Airlines

Tue 14/1021:20LTN - ORD

2 stops21h 35mMultiple Airlines

Deal found 14/7£454

Thu 14/812:54ORD - LGW

2 stops13h 16mAmerican Airlines

Thu 21/810:40LGW - ORD

2 stops19h 08mAmerican Airlines

Deal found 15/7£455

Thu 14/820:50ORD - STN

2 stops20h 30mMultiple Airlines

Tue 19/816:15STN - ORD

2 stops31h 35mMultiple Airlines

Deal found 15/7£455

Sat 2/818:15ORD - LHR

1 stop15h 20mTAP AIR PORTUGAL

Sat 23/808:00LHR - ORD

1 stop14h 30mTAP AIR PORTUGAL

Deal found 15/7£455

Best flights from Chicago to London
Discover carefully curated flight deals from Chicago to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 July 2025.

Fri 26/916:55ORD - LHR

Nonstop7h 55mBritish Airways

Sat 11/1009:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 16/7£447

Mon 20/1019:25ORD - LGW

1 stop13h 10mIcelandair

Fri 24/1015:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 15/7£447

Thu 4/919:15ORD - LHR

2 stops15h 45mScandinavian Airlines

Sun 14/921:05LHR - ORD

2 stops25h 05mScandinavian Airlines

Deal found 16/7£449

Tue 29/716:30ORD - LGW

1 stop12h 20mIberia

Wed 13/811:35LGW - ORD

1 stop13h 15mIberia

Deal found 15/7£449

Sat 13/910:27ORD - LGW

1 stop14h 33mMultiple Airlines

Sat 20/913:05LGW - ORD

1 stop15h 06mMultiple Airlines

Deal found 15/7£449

Mon 18/814:20ORD - LCY

1 stop12h 30mSWISS

Thu 28/809:25LCY - ORD

1 stop12h 30mSWISS

Deal found 16/7£452

Thu 14/812:54ORD - LGW

2 stops13h 16mAmerican Airlines

Thu 21/810:40LGW - ORD

2 stops19h 08mAmerican Airlines

Deal found 15/7£455

Sat 2/818:15ORD - LHR

1 stop15h 20mTAP AIR PORTUGAL

Sat 23/808:00LHR - ORD

1 stop14h 30mTAP AIR PORTUGAL

Deal found 15/7£455

Sun 3/822:30ORD - LHR

Nonstop7h 45mFinnair

Tue 12/814:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 14/7£457

Thu 30/1013:00MDW - LHR

2 stops13h 40mDelta

Thu 6/1108:40LHR - MDW

2 stops15h 56mDelta

Deal found 15/7£458

Sun 31/821:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 9/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 14/7£458

Mon 15/910:35MDW - LHR

1 stop14h 10mVirgin Atlantic

Tue 30/906:15LHR - MDW

2 stops21h 21mVirgin Atlantic

Deal found 16/7£463

Direct flights from Chicago to London
Explore direct flight options from Chicago to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 16 July 2025.

Fri 26/916:55ORD - LHR

Nonstop7h 55mBritish Airways

Sat 11/1009:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 16/7£447

Mon 28/720:15ORD - LHR

Nonstop8h 05mIberia

Fri 15/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 14/7£454

Sun 3/820:15ORD - LHR

Nonstop8h 05mFinnair

Tue 12/814:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 14/7£456

Sun 31/821:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 9/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 14/7£458

Fri 15/819:15ORD - LHR

Nonstop7h 55mAmerican Airlines

Tue 2/914:25LHR - ORD

Nonstop8h 35mAmerican Airlines

Deal found 16/7£472

Last-minute flights from Chicago to London
Discover last-minute flight deals from Chicago to London. Data last updated 16 July 2025 and is based on user searches.

Tue 22/719:25ORD - LGW

1 stop13h 15mIcelandair

Wed 1/1015:40LGW - ORD

1 stop32h 35mIcelandair

Deal found 15/7£457

Tue 22/721:15ORD - LHR

1 stop10h 10mAer Lingus

Tue 12/808:50LHR - ORD

1 stop11h 10mAer Lingus

Deal found 16/7£481

Tue 22/710:40ORD - LHR

1 stop13h 50mAir Canada

Wed 1/1009:30LHR - ORD

2 stops15h 24mAir Canada

Deal found 15/7£481

Tue 22/710:40ORD - LHR

2 stops13h 55mMultiple Airlines

Tue 19/820:25LHR - ORD

1 stop22h 05mMultiple Airlines

Deal found 15/7£515

Tue 22/716:15ORD - LCY

1 stop11h 15mKLM

Wed 1/1007:45LCY - ORD

1 stop12h 55mKLM

Deal found 15/7£526

Tue 22/716:15ORD - LCY

1 stop10h 35mVirgin Atlantic

Wed 1/1008:40LCY - ORD

2 stops15h 19mVirgin Atlantic

Deal found 15/7£534

Tue 22/705:51ORD - LGW

2 stops19h 09mMultiple Airlines

Wed 1/1014:00LGW - ORD

1 stop32h 12mMultiple Airlines

Deal found 15/7£534

Tue 22/714:20ORD - LHR

1 stop11h 35mSWISS

Tue 19/807:00LHR - ORD

2 stops35h 10mSWISS

Deal found 15/7£551

Fri 25/717:40ORD - LHR

Nonstop7h 40mIberia

Sat 30/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 15/7£460

Fri 25/709:50ORD - LHR

1 stop15h 25mDelta

Sat 30/811:45LHR - ORD

2 stops15h 50mDelta

Deal found 15/7£471

Sat 26/708:40ORD - LHR

1 stop15h 50mUnited Airlines

Wed 13/808:30LHR - ORD

Nonstop8h 55mUnited Airlines

Deal found 14/7£474

Sat 26/722:15ORD - LHR

1 stop31h 40mIcelandair

Sun 17/821:25LHR - ORD

1 stop29h 50mIcelandair

Deal found 15/7£546

One-way flights from Chicago to London
Search for one-way flight options from Chicago to London. Find affordable one-way fares based on user searches. Data last updated 16 July 2025.

Sun 3/818:00ORD - LHR

2 stops20h 05mMultiple Airlines

Deal found 14/7£252

Fri 24/1022:15ORD - LTN

2 stops12h 05mMultiple Airlines

Deal found 14/7£252

Thu 14/821:12MDW - LGW

1 stop30h 48mMultiple Airlines

Deal found 14/7£252

Fri 24/1005:05ORD - STN

3 stops29h 30mMultiple Airlines

Deal found 14/7£252

Thu 13/1115:55ORD - LGW

1 stop11h 50mMultiple Airlines

Deal found 14/7£253

Thu 13/1117:10ORD - LCY

2 stops19h 30mMultiple Airlines

Deal found 14/7£253

Thu 11/912:05ORD - SEN

3 stops21h 40mMultiple Airlines

Deal found 16/7£256

Wed 17/922:15ORD - LHR

1 stop16h 05mIcelandair

Deal found 16/7£257

Wed 17/922:15ORD - LGW

1 stop10h 25mIcelandair

Deal found 14/7£257

Thu 7/809:40MDW - LTN

3 stops21h 25mMultiple Airlines

Deal found 14/7£258

Tue 14/1013:36ORD - LHR

1 stop13h 54mJetBlue

Deal found 15/7£263

Mon 29/909:42ORD - LGW

1 stop17h 53mJetBlue

Deal found 14/7£263

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 26/9

16:55-06:50

Nonstop7h 55m

London Heathrow

Sat 11/10

09:15-11:50

Nonstop8h 35m

£447

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 20/10

19:25-14:35

1 stop13h 10m

London Gatwick

Fri 24/10

15:40-21:15

1 stop11h 35m

£447

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 4/9

19:15-17:00

2 stops15h 45m

London Heathrow

Sun 14/9

21:05-16:10

2 stops25h 05m

£449

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Tue 29/7

16:30-10:50

1 stop12h 20m

London Gatwick

Wed 13/8

11:35-18:50

1 stop13h 15m

£449

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sat 13/9

10:27-07:00

1 stop14h 33m

London Gatwick

Sat 20/9

13:05-22:11

1 stop15h 06m

£449

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 10/8

16:30-18:05

2 stops19h 35m

London City

Fri 22/8

07:00-17:14

2 stops16h 14m

£451

ChicagoLondon

MDW - LGW

MDWLGW

Chicago Midway

Sat 18/10

11:21-10:00

1 stop16h 39m

London Gatwick

Sat 1/11

14:00-08:44

1 stop23h 44m

£452

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Thu 8/1

19:20-18:05

1 stop16h 45m

London Stansted

Thu 15/1

08:45-16:45

1 stop14h 00m

£452

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Mon 18/8

14:20-08:50

1 stop12h 30m

London City

Thu 28/8

09:25-15:55

1 stop12h 30m

£452

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 14/8

12:54-08:10

2 stops13h 16m

London Gatwick

Thu 21/8

10:40-23:48

2 stops19h 08m

£455

Flights are sorted by cheapest return flights first.

Deals found on 14/7

Showing 1-10 of 60 results

...

Best time to book a flight from Chicago to London

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

How far ahead should I book a flight from Chicago to London?

The best time to book flights from Chicago to London is 83 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from Chicago to London (average of £112). Flying from Chicago 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 CHI to LON?

Unlike at midday, when flights are generally more expensive, you can save up to 26% on flights from Chicago to London by exploring options for tickets in the afternoon.

Weekly flight availability from Chicago to London

The most flights from CHI to LON are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (51 on average).

Reviews of airlines servicing London

Read reviews from past customers who have flown with Delta, Porter Airlines, andKLM from Chicago to London. 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

7,957 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

7,957 reviews

Delta

8.0

Very Good

7,957 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

310 reviews

Delta

8.0

Very Good

7,957 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

1,373 reviews

Delta

8.0

Very Good

7,957 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!

Finnair

7.6

Good

1,316 reviews

Delta

8.0

Very Good

7,957 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

1,466 reviews

Delta

8.0

Very Good

7,957 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 flying from Chicago to London round-trip?
Our cheapest airline available from Chicago to London is British Airways. Our recent data shows that you can find tickets from as low as £447 on this airline. Additional options worth looking into are Icelandair and Scandinavian Airlines, starting at £447 and £449 round-trip. These flights start at 21% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Chicago to London one-way?
£257 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 £263 and £264, respectively.
What are the most popular routes from Chicago to London?
The most popular route from Chicago to London is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City.
What are the most reliable airlines from Chicago 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 Chicago to London on time: Air Canada (66%), Austrian Airlines (66%), United Airlines (66%).
What are the cheapest flights from Chicago to London?
On average you can expect to pay £1,766 for a flight from Chicago to London. The cheapest flight overall is £289 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £318.
Can I find deals for flights from Chicago to London that include hotel bookings?
Yes. In addition to deals on Chicago to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Chicago to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to London.
Can I find deals for business class flights from Chicago to London?
Yes. Cheapflights offers flight deals from Chicago 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 Chicago to London?
Currently, January is the cheapest month in which you can book a flight from Chicago to London (average of £112). Flying from Chicago 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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Hayes

Ipswich

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Winchester

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Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from Chicago to London

Airline	Cheapest	Average	Flexibility	On-time
Aer Lingus	Cheapest£412	Average£580	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£414	Average£602	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£447	Average£570	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
United Airlines	Cheapest£462	Average£702	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£465	Average£645	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£485	Average£807	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£514	Average£634	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

Fly with Cheapflights

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

Cheapflights makes it easy to find Chicago to London flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to London from Chicago.

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

Yes! Cheapflights helps users easily find flights from Chicago to London with no change fees.

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

Yes! Start tracking prices for Chicago to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from Chicago to London from £252

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 24/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Chicago to London are usually found in February or January, booked 83 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Chicago to London

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Chicago to London

Cheapest flights from Chicago to LondonExplore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 July 2025.

Explore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 July 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Chicago to London

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

Cheapflights Insights

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

How far ahead should I book a flight from Chicago to London?

Use this chart to determine the optimal time to book a return flight from Chicago to London. Price data was last updated on 11 July 2025.

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

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

Find hourly flight availability from Chicago 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 16 July 2025.

Weekly flight availability from Chicago to London

Explore weekly flight availability from Chicago 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 16 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 16 July 2025.

Read reviews from past customers who have flown with Delta, Porter Airlines, andKLM from Chicago to London. 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 Chicago 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 flying from Chicago to London round-trip?

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

What are the most popular routes from Chicago to London?

What are the most reliable airlines from Chicago to London?

What are the cheapest flights from Chicago to London?

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

How can I find direct flights from Chicago to London?

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Cheapest flights from Chicago to London
Explore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 July 2025.