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

Our cheapest airline available from Chicago to London is Austrian Airlines. Our recent data shows that you can find tickets from as low as £482 on this airline. Additional options worth looking into are Virgin Atlantic and United Airlines, starting at £482 and £483 round-trip. These flights start at 13% lower than the current average price 3 months from now.

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

£271 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Icelandair and Porter Airlines, with prices starting from £272 and £273, 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 Wednesday 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 £1,451 for a flight from Chicago to London. The cheapest flight overall is £307 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £338.

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 (80%), Air Canada (76%), Austrian Airlines (76%).

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 5% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £520 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £520.

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 £558 for the month, but tickets can be as low as £344. 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.

£269+ 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	£482
One-way from	£269
Popular in	June
Cheapest in	February
Average price	£833
Good round-trip deal	£564 or less
Good one-way deal	£333 or less

Austrian Airlines
14/10-29/10
3 total stops
33h 25m total
Chicago to London

Search Deals

2/7
3 total stops
52h 55m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£109 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 27 June 2025.

Wed 26/1119:05ORD - LGW

1 stop16h 45mSWISS

Wed 3/1218:40LGW - ORD

1 stop27h 35mSWISS

Deal found 27/6£482

Tue 14/1012:55ORD - LHR

2 stops19h 25mAustrian Airlines

Tue 28/1019:25LHR - ORD

1 stop24h 35mAustrian Airlines

Deal found 26/6£482

Sun 3/813:46MDW - LHR

1 stop17h 24mVirgin Atlantic

Fri 22/811:45LHR - MDW

2 stops16h 04mVirgin Atlantic

Deal found 25/6£482

Thu 7/821:10ORD - LGW

2 stops31h 45mMultiple Airlines

Thu 28/810:45LGW - ORD

2 stops24h 05mMultiple Airlines

Deal found 26/6£482

Tue 16/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 26/906:30LHR - ORD

1 stop12h 25mUnited Airlines

Deal found 26/6£483

Sun 7/919:25ORD - LTN

2 stops16h 50mMultiple Airlines

Thu 11/906:05LTN - ORD

2 stops18h 10mMultiple Airlines

Deal found 25/6£483

Sat 23/818:17MDW - LHR

1 stop32h 38mDelta

Fri 5/911:45LHR - MDW

1 stop12h 52mDelta

Deal found 25/6£483

Mon 4/814:20ORD - LCY

1 stop12h 30mSWISS

Wed 20/819:20LCY - ORD

1 stop22h 50mSWISS

Deal found 26/6£483

Thu 11/920:40ORD - LHR

Nonstop7h 50mAmerican Airlines

Fri 19/907:40LHR - ORD

1 stop14h 05mAmerican Airlines

Deal found 26/6£484

Sat 20/919:25ORD - STN

2 stops21h 15mMultiple Airlines

Sat 4/1006:35STN - ORD

3 stops38h 29mMultiple Airlines

Deal found 25/6£484

Tue 19/819:15ORD - LHR

2 stops17h 35mScandinavian Airlines

Sat 23/817:30LHR - ORD

2 stops28h 40mScandinavian Airlines

Deal found 26/6£484

Sat 16/813:25ORD - LGW

1 stop14h 35mDelta

Thu 28/812:00LGW - ORD

1 stop15h 53mDelta

Deal found 25/6£484

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 27 June 2025.

Tue 14/1012:55ORD - LHR

2 stops19h 25mAustrian Airlines

Wed 29/1006:00LHR - ORD

1 stop14h 00mAustrian Airlines

Deal found 26/6£482

Sun 3/813:46MDW - LHR

1 stop17h 24mVirgin Atlantic

Fri 22/811:45LHR - MDW

2 stops16h 04mVirgin Atlantic

Deal found 25/6£482

Thu 7/821:10ORD - LGW

2 stops31h 45mMultiple Airlines

Thu 28/810:45LGW - ORD

2 stops24h 05mMultiple Airlines

Deal found 26/6£482

Tue 16/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 26/906:30LHR - ORD

1 stop12h 25mUnited Airlines

Deal found 26/6£483

Sat 23/818:17MDW - LHR

1 stop32h 38mDelta

Fri 5/911:45LHR - MDW

1 stop12h 52mDelta

Deal found 25/6£483

Mon 4/814:20ORD - LCY

1 stop12h 30mSWISS

Wed 20/819:20LCY - ORD

1 stop22h 50mSWISS

Deal found 26/6£483

Thu 11/920:40ORD - LHR

Nonstop7h 50mAmerican Airlines

Fri 19/907:40LHR - ORD

1 stop14h 05mAmerican Airlines

Deal found 26/6£484

Tue 19/819:15ORD - LHR

2 stops17h 35mScandinavian Airlines

Sat 23/817:30LHR - ORD

2 stops28h 40mScandinavian Airlines

Deal found 26/6£484

Tue 5/817:40ORD - LHR

Nonstop7h 40mIberia

Tue 12/814:25LHR - ORD

Nonstop8h 35mIberia

Deal found 26/6£485

Fri 22/816:55ORD - LHR

Nonstop7h 55mBritish Airways

Tue 26/814:25LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 26/6£486

Thu 7/820:35ORD - LHR

Nonstop7h 55mFinnair

Thu 28/807:30LHR - ORD

1 stop16h 20mFinnair

Deal found 26/6£487

Thu 21/822:15ORD - LGW

1 stop10h 25mIcelandair

Sat 30/813:00LGW - ORD

1 stop11h 15mIcelandair

Deal found 25/6£487

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 27 June 2025.

Wed 23/719:15ORD - LHR

Nonstop7h 55mBritish Airways

Tue 12/815:30LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 26/6£482

Tue 5/817:40ORD - LHR

Nonstop7h 40mIberia

Tue 12/814:25LHR - ORD

Nonstop8h 35mIberia

Deal found 26/6£485

Tue 22/716:05ORD - LHR

Nonstop8h 15mUnited Airlines

Wed 6/808:30LHR - ORD

Nonstop8h 55mUnited Airlines

Deal found 24/6£490

Thu 7/817:00ORD - LHR

Nonstop7h 55mFinnair

Thu 28/811:10LHR - ORD

Nonstop8h 45mFinnair

Deal found 26/6£498

Sun 20/720:15ORD - LHR

Nonstop8h 05mAmerican Airlines

Sun 27/712:15LHR - ORD

Nonstop8h 25mAmerican Airlines

Deal found 26/6£534

Mon 4/817:40ORD - LHR

Nonstop7h 40mAlaska Airlines

Wed 20/814:25LHR - ORD

Nonstop8h 35mAlaska Airlines

Deal found 25/6£614

Sun 10/821:25ORD - LHR

Nonstop8h 20mMultiple Airlines

Tue 19/808:30LHR - ORD

Nonstop8h 55mMultiple Airlines

Deal found 26/6£632

Sun 3/816:05ORD - LHR

Nonstop8h 15mLufthansa

Wed 13/814:10LHR - ORD

Nonstop9h 10mLufthansa

Deal found 25/6£636

Last-minute flights from Chicago to London
Discover last-minute flight deals from Chicago to London. Data last updated 27 June 2025 and is based on user searches.

Tue 1/707:56ORD - LHR

3 stops31h 04mMultiple Airlines

Tue 8/706:00LHR - ORD

3 stops23h 45mMultiple Airlines

Deal found 24/6£613

Thu 3/719:15ORD - STN

2 stops20h 30mMultiple Airlines

Sat 19/718:30STN - ORD

2 stops27h 40mMultiple Airlines

Deal found 26/6£619

Thu 3/719:15ORD - LTN

2 stops19h 25mMultiple Airlines

Sat 19/721:20LTN - ORD

2 stops24h 50mMultiple Airlines

Deal found 26/6£691

Fri 4/712:13ORD - LHR

1 stop15h 17mJetBlue

Fri 15/811:55LHR - ORD

1 stop16h 33mJetBlue

Deal found 25/6£551

Fri 4/719:25ORD - LGW

1 stop10h 20mIcelandair

Fri 15/815:40LGW - ORD

1 stop11h 35mIcelandair

Deal found 26/6£568

Fri 4/719:15ORD - LHR

1 stop14h 45mScandinavian Airlines

Fri 15/807:05LHR - ORD

2 stops15h 05mScandinavian Airlines

Deal found 26/6£632

Sat 5/718:15ORD - LHR

1 stop18h 35mTAP AIR PORTUGAL

Wed 8/406:00LHR - ORD

1 stop16h 10mTAP AIR PORTUGAL

Deal found 25/6£498

Sat 5/713:43ORD - LGW

1 stop35h 12mMultiple Airlines

Sun 20/710:00LGW - ORD

1 stop36h 11mMultiple Airlines

Deal found 25/6£572

Sat 5/721:12MDW - LGW

1 stop30h 58mMultiple Airlines

Tue 8/711:35LGW - MDW

2 stops27h 10mMultiple Airlines

Deal found 25/6£639

Sat 5/721:14ORD - LHR

2 stops17h 46mAir Canada

Wed 8/414:05LHR - ORD

1 stop11h 14mAir Canada

Deal found 25/6£669

Sat 5/716:55ORD - LHR

Nonstop7h 55mFinnair

Wed 8/410:20LHR - ORD

1 stop13h 30mFinnair

Deal found 25/6£686

Sun 6/715:00ORD - LGW

1 stop14h 15mITA Airways

Sun 20/712:05LGW - ORD

1 stop31h 05mITA Airways

Deal found 25/6£683

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 27 June 2025.

Wed 2/722:15ORD - LHR

3 stops52h 55mMultiple Airlines

Deal found 26/6£269

Mon 11/818:10ORD - LTN

1 stop21h 25mMultiple Airlines

Deal found 26/6£269

Tue 15/722:15ORD - SEN

3 stops32h 40mMultiple Airlines

Deal found 26/6£270

Sat 5/705:51ORD - LGW

2 stops22h 09mMultiple Airlines

Deal found 26/6£270

Fri 4/708:40ORD - LHR

1 stop15h 50mJetBlue

Deal found 26/6£271

Thu 28/819:25ORD - LHR

1 stop10h 30mIcelandair

Deal found 26/6£272

Mon 22/909:15MDW - LTN

2 stops24h 45mMultiple Airlines

Deal found 25/6£272

Tue 29/719:25ORD - LCY

3 stops20h 15mMultiple Airlines

Deal found 26/6£272

Sun 6/714:44MDW - LGW

2 stops37h 16mMultiple Airlines

Deal found 25/6£272

Thu 25/919:25ORD - STN

3 stops15h 25mMultiple Airlines

Deal found 25/6£272

Tue 29/709:40MDW - LGW

2 stops18h 10mPorter Airlines

Deal found 26/6£273

Mon 14/718:10ORD - LGW

2 stops20h 15mTAP AIR PORTUGAL

Deal found 26/6£273

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 14/10

12:55-14:20

2 stops19h 25m

London Heathrow

Tue 28/10

19:25-15:00

1 stop24h 35m

£482

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 3/8

13:46-13:10

1 stop17h 24m

London Heathrow

Fri 22/8

11:45-21:49

2 stops16h 04m

£482

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 7/8

21:10-10:55

2 stops31h 45m

London Gatwick

Thu 28/8

10:45-04:50

2 stops24h 05m

£482

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 16/9

21:25-11:45

Nonstop8h 20m

London Heathrow

Fri 26/9

06:30-12:55

1 stop12h 25m

£483

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sat 23/8

18:17-08:55

1 stop32h 38m

London Heathrow

Fri 5/9

11:45-18:37

1 stop12h 52m

£483

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Mon 4/8

14:20-08:50

1 stop12h 30m

London City

Wed 20/8

19:20-12:10

1 stop22h 50m

£483

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sun 7/9

19:25-18:15

2 stops16h 50m

London Luton

Thu 11/9

06:05-18:15

2 stops18h 10m

£483

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 22/8

16:55-06:50

Nonstop7h 55m

London Heathrow

Wed 27/8

09:30-17:50

1 stop14h 20m

£484

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sat 20/9

19:25-22:40

2 stops21h 15m

London Stansted

Sat 4/10

06:35-15:04

3 stops38h 29m

£484

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 19/8

19:15-18:50

2 stops17h 35m

London Heathrow

Sat 23/8

17:30-16:10

2 stops28h 40m

£484

Flights are sorted by cheapest return flights first.

Deals found on 26/6

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 25% 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 (51 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (46 on average).

How much does it cost for a return flight from Chicago to London?

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

7,963 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

7,963 reviews

Delta

8.0

Very Good

7,963 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

295 reviews

Delta

8.0

Very Good

7,963 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

1,365 reviews

Delta

8.0

Very Good

7,963 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

401 reviews

Delta

8.0

Very Good

7,963 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

805 reviews

Delta

8.0

Very Good

7,963 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 Austrian Airlines. Our recent data shows that you can find tickets from as low as £482 on this airline. Additional options worth looking into are Virgin Atlantic and United Airlines, starting at £482 and £483 round-trip. These flights start at 13% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Chicago to London one-way?
£271 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Icelandair and Porter Airlines, with prices starting from £272 and £273, 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 (80%), Air Canada (76%), Austrian Airlines (76%).
What are the cheapest flights from Chicago to London?
On average you can expect to pay £1,451 for a flight from Chicago to London. The cheapest flight overall is £307 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £338.
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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Top 7 airlines flying from Chicago to London

Airline	Cheapest	Average	Flexibility	On-time
Aer Lingus	Cheapest£402	Average£567	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£405	Average£588	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£437	Average£566	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
United Airlines	Cheapest£452	Average£686	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£454	Average£638	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£474	Average£789	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£502	Average£744	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 £269

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 2/7. 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 27 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 27 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 20 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 27 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 27 June 2025.

How much does it cost for a return flight from Chicago to London?

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 27 June 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?

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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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 27 June 2025.