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

Our cheapest airline available from Chicago to London is Scandinavian Airlines. Our recent data shows that you can find tickets from as low as £492 on this airline. Additional options worth looking into are SWISS and Icelandair, starting at £492 and £494 round-trip. These flights start at 12% lower than the current average price 3 months from now.

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

£279 is the cheapest one-way deal found within the past few days, from Virgin Atlantic. You may also be able to find cheap deals on ITA Airways and British Airways, with prices starting from £279 and £280, 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 Thursday afternoons 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.

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 £1,916 for a flight from Chicago to London. The cheapest flight overall is £272 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £270.

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: Royal Jordanian (81%), SriLankan Airlines (75%), Air Canada (72%).

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 21% 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 5% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £525 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £525.

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 £564 for the month, but tickets can be as low as £348. 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.

£277+ Flights from Chicago to London

Cheapflights Tip: The best prices from Chicago to London are usually found in February or January, booked 84 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Chicago to London

Round-trip from	£492
One-way from	£277
Popular in	June
Cheapest in	February
Average price	£840
Good round-trip deal	£569 or less
Good one-way deal	£337 or less

Scandinavian Airlines
26/8-6/9
3 total stops
29h 25m total
Chicago to London

Search Deals

2/8
1 total stop
33h 10m total
Chicago 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 June 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 13 June 2025.

Tue 26/819:15ORD - LHR

2 stops17h 35mScandinavian Airlines

Sat 6/910:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 12/6£492

Tue 4/1119:05ORD - LCY

1 stop17h 35mSWISS

Tue 11/1109:15LCY - ORD

1 stop13h 00mSWISS

Deal found 12/6£492

Mon 28/719:05ORD - LGW

1 stop16h 45mSWISS

Mon 11/818:35LGW - ORD

1 stop27h 20mSWISS

Deal found 12/6£493

Fri 22/819:25ORD - LHR

1 stop10h 30mIcelandair

Thu 28/813:05LHR - ORD

1 stop11h 10mIcelandair

Deal found 10/6£494

Sun 20/710:37ORD - LGW

1 stop17h 23mVirgin Atlantic

Tue 29/712:00LGW - ORD

2 stops18h 09mVirgin Atlantic

Deal found 10/6£494

Mon 4/815:14ORD - LHR

1 stop10h 36mIberia

Wed 13/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 12/6£495

Mon 28/719:25ORD - LGW

1 stop10h 20mIcelandair

Wed 6/815:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 12/6£495

Sun 20/721:50ORD - LHR

1 stop27h 50mUnited Airlines

Tue 29/717:40LHR - ORD

1 stop31h 49mUnited Airlines

Deal found 10/6£495

Mon 1/919:25ORD - LGW

1 stop10h 20mMultiple Airlines

Mon 8/910:00LGW - ORD

2 stops18h 28mMultiple Airlines

Deal found 12/6£495

Tue 22/712:43MDW - LHR

1 stop12h 32mVirgin Atlantic

Tue 29/711:45LHR - MDW

1 stop12h 55mVirgin Atlantic

Deal found 10/6£496

Tue 19/822:30ORD - LCY

1 stop11h 55mMultiple Airlines

Wed 27/809:25LCY - ORD

1 stop12h 30mMultiple Airlines

Deal found 10/6£497

Mon 4/819:25ORD - STN

2 stops20h 45mMultiple Airlines

Tue 19/807:00STN - ORD

2 stops17h 15mMultiple Airlines

Deal found 11/6£497

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 13 June 2025.

Tue 26/819:15ORD - LHR

2 stops17h 35mScandinavian Airlines

Sat 6/910:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 12/6£492

Tue 4/1119:05ORD - LCY

1 stop17h 35mSWISS

Tue 11/1109:15LCY - ORD

1 stop13h 00mSWISS

Deal found 12/6£492

Mon 4/819:25ORD - LGW

1 stop10h 20mIcelandair

Wed 13/815:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 12/6£494

Mon 4/815:14ORD - LHR

1 stop10h 36mIberia

Wed 13/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 12/6£495

Mon 1/919:25ORD - LGW

1 stop10h 20mMultiple Airlines

Mon 8/910:00LGW - ORD

2 stops18h 28mMultiple Airlines

Deal found 12/6£495

Sun 20/716:05ORD - LHR

Nonstop8h 15mUnited Airlines

Tue 29/714:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 11/6£496

Sun 6/707:00ORD - LGW

1 stop21h 00mVirgin Atlantic

Tue 5/812:00LGW - ORD

1 stop15h 43mVirgin Atlantic

Deal found 12/6£497

Mon 3/1120:20ORD - LGW

1 stop20h 15mTurkish Airlines

Wed 12/1106:25LGW - ORD

1 stop18h 00mTurkish Airlines

Deal found 12/6£499

Wed 1/1022:20ORD - LCY

1 stop17h 20mBritish Airways

Mon 6/1015:30LCY - ORD

2 stops32h 25mBritish Airways

Deal found 10/6£500

Mon 1/918:10ORD - LGW

1 stop15h 25mTAP AIR PORTUGAL

Sat 6/921:15LGW - ORD

2 stops24h 55mTAP AIR PORTUGAL

Deal found 13/6£500

Mon 28/707:04ORD - LHR

2 stops17h 26mAir Canada

Tue 12/809:30LHR - ORD

1 stop30h 22mAir Canada

Deal found 11/6£501

Tue 2/922:30ORD - LCY

1 stop11h 55mLufthansa

Thu 18/908:45LCY - ORD

1 stop17h 10mLufthansa

Deal found 12/6£501

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 13 June 2025.

Sun 20/717:40ORD - LHR

Nonstop7h 40mBritish Airways

Mon 25/809:15LHR - ORD

Nonstop8h 40mBritish Airways

Deal found 12/6£495

Sun 20/721:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 29/708:30LHR - ORD

Nonstop8h 55mUnited Airlines

Deal found 11/6£496

Sun 27/717:40ORD - LHR

Nonstop7h 40mIberia

Tue 5/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 12/6£497

Tue 30/916:00ORD - LHR

Nonstop8h 20mAir Canada

Sun 5/1011:05LHR - ORD

Nonstop9h 05mAir Canada

Deal found 11/6£520

Fri 3/1020:40ORD - LHR

Nonstop7h 50mFinnair

Sun 12/1009:15LHR - ORD

Nonstop8h 35mFinnair

Deal found 12/6£567

Sun 27/722:30ORD - LHR

Nonstop7h 45mAmerican Airlines

Sun 3/813:10LHR - ORD

Nonstop8h 45mAmerican Airlines

Deal found 12/6£595

Sun 20/722:30ORD - LHR

Nonstop7h 45mMultiple Airlines

Tue 29/712:15LHR - ORD

Nonstop8h 25mMultiple Airlines

Deal found 11/6£634

Sun 20/719:15ORD - LHR

Nonstop7h 55mAlaska Airlines

Tue 29/712:15LHR - ORD

Nonstop8h 25mAlaska Airlines

Deal found 12/6£643

Last-minute flights from Chicago to London
Discover last-minute flight deals from Chicago to London. Data last updated 13 June 2025 and is based on user searches.

Tue 17/605:51ORD - LHR

2 stops18h 44mMultiple Airlines

Tue 24/612:10LHR - ORD

2 stops24h 27mMultiple Airlines

Deal found 10/6£633

Tue 17/609:40MDW - LGW

2 stops17h 45mMultiple Airlines

Fri 20/612:40LGW - MDW

1 stop26h 05mMultiple Airlines

Deal found 9/6£654

Wed 18/611:25ORD - LHR

1 stop22h 35mTurkish Airlines

Wed 9/718:20LHR - ORD

1 stop21h 20mTurkish Airlines

Deal found 11/6£636

Fri 20/619:25ORD - LHR

1 stop10h 30mIcelandair

Tue 29/721:25LHR - ORD

1 stop26h 50mIcelandair

Deal found 11/6£762

Fri 20/619:25ORD - LGW

1 stop10h 20mIcelandair

Tue 29/715:40LGW - ORD

1 stop32h 35mIcelandair

Deal found 11/6£817

Sat 21/613:43ORD - LGW

1 stop35h 12mMultiple Airlines

Tue 24/610:00LGW - ORD

1 stop17h 56mMultiple Airlines

Deal found 10/6£598

Sat 21/620:25ORD - LHR

1 stop30h 10mAir Canada

Sat 28/617:40LHR - ORD

3 stops31h 13mAir Canada

Deal found 10/6£717

Sat 21/609:40MDW - LGW

2 stops18h 10mPorter Airlines

Sun 22/613:10LGW - MDW

2 stops25h 35mPorter Airlines

Deal found 10/6£718

Sat 21/609:40ORD - LHR

1 stop14h 50mJetBlue

Wed 25/608:25LHR - ORD

1 stop13h 28mJetBlue

Deal found 12/6£791

Sat 21/615:50ORD - STN

2 stops15h 50mMultiple Airlines

Sat 28/606:35STN - ORD

3 stops16h 52mMultiple Airlines

Deal found 10/6£868

Sun 22/618:00ORD - LGW

1 stop33h 45mTAP AIR PORTUGAL

Wed 2/716:25LGW - ORD

1 stop29h 45mTAP AIR PORTUGAL

Deal found 12/6£912

Sun 22/618:00ORD - LHR

1 stop34h 20mTAP AIR PORTUGAL

Wed 2/718:45LHR - ORD

1 stop27h 25mTAP AIR PORTUGAL

Deal found 12/6£915

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 13 June 2025.

Sat 2/818:15ORD - STN

1 stop33h 10mMultiple Airlines

Deal found 12/6£277

Wed 2/705:51ORD - LHR

2 stops50h 24mMultiple Airlines

Deal found 12/6£278

Thu 23/1019:25ORD - LTN

2 stops16h 10mMultiple Airlines

Deal found 13/6£278

Tue 29/722:15ORD - LCY

2 stops16h 10mMultiple Airlines

Deal found 12/6£278

Tue 15/719:25ORD - LGW

3 stops16h 55mMultiple Airlines

Deal found 11/6£278

Tue 29/719:25ORD - SEN

3 stops18h 15mMultiple Airlines

Deal found 11/6£278

Tue 2/919:17MDW - LHR

1 stop11h 53mVirgin Atlantic

Deal found 12/6£279

Tue 29/707:00ORD - LGW

2 stops22h 15mITA Airways

Deal found 12/6£279

Thu 4/913:59MDW - LHR

2 stops15h 56mMultiple Airlines

Deal found 12/6£280

Sun 22/609:40MDW - LGW

1 stop16h 15mMultiple Airlines

Deal found 11/6£280

Wed 23/719:15ORD - LHR

Nonstop7h 55mBritish Airways

Deal found 12/6£280

Mon 28/718:10ORD - LGW

2 stops35h 10mTAP AIR PORTUGAL

Deal found 13/6£282

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

Tue 26/8

19:15-18:50

2 stops17h 35m

London Heathrow

Sat 6/9

10:20-16:10

1 stop11h 50m

£492

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Tue 4/11

19:05-18:40

1 stop17h 35m

London City

Tue 11/11

09:15-16:15

1 stop13h 00m

£492

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 28/7

19:05-17:50

1 stop16h 45m

London Gatwick

Mon 11/8

18:35-15:55

1 stop27h 20m

£493

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 4/8

19:25-11:45

1 stop10h 20m

London Gatwick

Wed 13/8

15:40-21:15

1 stop11h 35m

£494

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 4/8

15:14-07:50

1 stop10h 36m

London Heathrow

Wed 13/8

09:15-11:55

Nonstop8h 40m

£495

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 1/9

19:25-11:45

1 stop10h 20m

London Gatwick

Mon 8/9

10:00-22:28

2 stops18h 28m

£495

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 20/7

16:05-06:20

Nonstop8h 15m

London Heathrow

Tue 29/7

14:10-17:20

Nonstop9h 10m

£496

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Wed 13/8

22:30-16:25

1 stop11h 55m

London City

Wed 10/9

09:25-15:55

1 stop12h 30m

£497

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Mon 4/8

19:25-22:10

2 stops20h 45m

London Stansted

Tue 19/8

07:00-18:15

2 stops17h 15m

£497

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 6/7

07:00-10:00

1 stop21h 00m

London Gatwick

Wed 6/8

12:00-21:43

1 stop15h 43m

£497

Flights are sorted by cheapest return flights first.

Deals found on 12/6

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 84 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 27% 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 Sunday, which is when the least amount of flights are scheduled (52 on average).

Rainfall in London by month

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.

Temperature in London by month

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).

Reviews of airlines servicing London

Read reviews from past customers who have flown Delta, Porter Airlines and KLM 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

7,946 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

7,946 reviews

Delta

8.0

Very Good

7,946 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

288 reviews

Delta

8.0

Very Good

7,946 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

1,358 reviews

Delta

8.0

Very Good

7,946 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 Transat

7.8

Good

396 reviews

Delta

8.0

Very Good

7,946 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

1,290 reviews

Delta

8.0

Very Good

7,946 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 Scandinavian Airlines. Our recent data shows that you can find tickets from as low as £492 on this airline. Additional options worth looking into are SWISS and Icelandair, starting at £492 and £494 round-trip. These flights start at 12% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Chicago to London one-way?
£279 is the cheapest one-way deal found within the past few days, from Virgin Atlantic. You may also be able to find cheap deals on ITA Airways and British Airways, with prices starting from £279 and £280, 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: Royal Jordanian (81%), SriLankan Airlines (75%), Air Canada (72%).
What are the cheapest flights from Chicago to London?
On average you can expect to pay £1,916 for a flight from Chicago to London. The cheapest flight overall is £272 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £270.
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

Deal

Hounslow

Croydon

Milton Keynes

Gatwick

Luton

Slough

Wembley

Crawley

Eastbourne

Ilford

Southend-on-Sea

Watford

Hayes

Ipswich

Winchester

Folkestone

Maidstone

Dartford

Guildford

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
Finnair	Cheapest£352	Average£643	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
American Airlines	Cheapest£378	Average£626	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Aer Lingus	Cheapest£406	Average£573	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Iberia	Cheapest£441	Average£566	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£469	Average£657	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£479	Average£797	FlexibilityNo cancel fee	On-time76%	Search Lufthansa 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 £277

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 2/8. 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 84 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 13 June 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 13 June 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 9 June 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 13 June 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 13 June 2025.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

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 13 June 2025.

Read reviews from past customers who have flown Delta, Porter Airlines and KLM 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?

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

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

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Alternative routes for Chicago to London

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Top 7 airlines flying 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 13 June 2025.