Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Chicago to London from £321

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LON
21 Jun — 28 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Chicago to London are usually found in February or October, booked 33 days in advance, depart on a Sunday or Monday and return on a Thursday

Cheap flight deals from Chicago to London

Enter your travel dates to find the best prices.

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 22 May 2026.

Tue 10/1113:15
ORD
-
LHR
1 stop11h 10m
Delta
Thu 19/1106:30
LHR
-
ORD
1 stop13h 55m
Delta
Deal found 17/5£633
Tue 3/1118:30
ORD
-
LTN
2 stops21h 30m
Multiple Airlines
Tue 10/1116:20
LTN
-
ORD
3 stops31h 00m
Multiple Airlines
Deal found 17/5£634
Sun 20/919:15
ORD
-
LHR
1 stop20h 25m
Scandinavian Airlines
Thu 24/906:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Deal found 18/5£635
Mon 9/1118:50
ORD
-
LCY
1 stop12h 00m
SWISS
Thu 19/1109:15
LCY
-
ORD
1 stop13h 05m
SWISS
Deal found 17/5£635
Tue 22/922:35
ORD
-
LHR
Nonstop7h 40m
Iberia
Tue 27/1011:25
LHR
-
ORD
1 stop13h 25m
Iberia
Deal found 17/5£636
Wed 16/922:25
ORD
-
LTN
2 stops17h 50m
Multiple Airlines
Mon 28/905:40
LTN
-
ORD
3 stops33h 20m
Multiple Airlines
Deal found 17/5£636
Fri 12/616:37
ORD
-
STN
2 stops18h 58m
Multiple Airlines
Wed 17/606:30
STN
-
ORD
3 stops18h 55m
Multiple Airlines
Deal found 18/5£636
Thu 27/819:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Mon 31/813:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 17/5£637
Sun 6/922:25
ORD
-
LTN
2 stops17h 55m
Multiple Airlines
Sun 20/908:00
LTN
-
ORD
2 stops36h 00m
Multiple Airlines
Deal found 18/5£637
Wed 10/608:50
ORD
-
LGW
2 stops26h 15m
Multiple Airlines
Wed 17/608:50
LGW
-
ORD
2 stops16h 35m
Multiple Airlines
Deal found 17/5£637
Tue 1/915:45
ORD
-
STN
1 stop12h 05m
Multiple Airlines
Tue 15/906:30
STN
-
ORD
1 stop13h 30m
Multiple Airlines
Deal found 18/5£637
Sun 16/819:15
ORD
-
LHR
1 stop16h 25m
Scandinavian Airlines
Thu 20/806:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Deal found 17/5£637

Find flight deals from Chicago to London

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 22 May 2026.

Round-trip from

£633

One-way from

£321

Popular in

June

Cheapest in

February

Average price

£695

Good round-trip deal

£928 or less

Good one-way deal

£398 or less
Delta
  • Delta
  • 10/11-19/11
  • 2 total stops
  • 25h 05m total
  • Chicago to London
Search Deals
10/9
  • 10/9
  • 3 total stops
  • 22h 00m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£151 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£27 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
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

Cheapflights Fare Finder

 
Customise your flight search to find flights from Chicago to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 22 May 2026.
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

Cheapest return flight

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 16/8

21:40-11:55

Nonstop8h 15m

London Heathrow

Fri 28/8

09:00-18:15

1 stop15h 15m

£640

ChicagoLondon

ORD - SEN

ORDSEN

Chicago O'Hare Intl

Wed 2/9

19:25-21:25

2 stops20h 00m

London Southend

Tue 22/9

06:30-18:15

3 stops41h 45m

£655

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 9/9

20:10-09:55

1 stop31h 45m

London Stansted

Wed 23/9

06:55-09:40

1 stop32h 45m

£658

ChicagoLondon

MDW - LGW

MDWLGW

Chicago Midway

Mon 24/8

13:27-09:40

2 stops14h 13m

London Gatwick

Tue 1/9

10:35-21:46

2 stops17h 11m

£659

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Tue 3/11

18:10-16:35

2 stops16h 25m

London City

Tue 10/11

20:05-14:25

1 stop24h 20m

£665

ChicagoLondon

MDW - LGW

MDWLGW

Chicago Midway

Tue 16/6

10:15-09:50

2 stops17h 35m

London Gatwick

Sun 21/6

09:40-14:35

2 stops34h 55m

£667

ChicagoLondon

MDW - LCY

MDWLCY

Chicago Midway

Wed 23/9

09:20-07:55

2 stops16h 35m

London City

Wed 30/9

09:20-21:46

2 stops18h 26m

£670

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Thu 3/9

19:25-22:10

2 stops20h 45m

London Luton

Thu 10/9

21:40-19:48

2 stops28h 08m

£670

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sat 19/9

11:25-16:40

1 stop23h 15m

London Stansted

Tue 29/9

17:35-09:40

1 stop22h 05m

£674

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Fri 2/10

11:25-09:55

1 stop16h 30m

London Stansted

Wed 14/10

17:45-09:40

1 stop21h 55m

£674

Flights are sorted by cheapest return flights first.

Deals found on 18/5

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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

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

Currently, November is the cheapest month in which you can book a flight from Chicago to London (average of £481). Flying from Chicago to London in February is currently the most expensive (average of £993). 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?

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 22 May 2026.

When flying from Chicago 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 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 22 May 2026.

The most flights from CHI to LON are scheduled on a Thursday (56 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (48 on average).

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

What’s the top stopover airport for flights from Chicago to London?

Share of one-stop return flights from Chicago to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Dublin (DUB) – chosen by Cheapflights users on 42% of one-stop itineraries from Chicago to London on Cheapflights.

What’s the cheapest stopover airport for flights from Chicago to London?

Average return fare for one-stop flights from Chicago to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £312.

What’s the fastest stopover option from Chicago to London?

Shortest average travel time for one-stop one-way flights from Chicago to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 10h 20m.

Which airport typically offers the quickest stopover for flights from Chicago to London?

Average stopover duration for one-stop one-way flights from Chicago to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

How often are flights from Chicago to London delayed?

About 25% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 173 minutes.

What is the most punctual flight time for Chicago to London flights?

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to London flights?

Over the past year, United Airlines have had the lowest number of delays on this route, with just 25% of flights being delayed.

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

The best time to book flights from Chicago to London is 32 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.

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 22 May 2026.
Read reviews from past customers who have flown with United Airlines,Aer Lingus, andAmerican Airlines 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.
United Airlines
7.4
Good
9,751 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,751 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Aer Lingus
7.3
Good
1,573 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
American Airlines
7.1
Good
11,644 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Lufthansa
6.8
Okay
8,018 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
British Airways
6.7
Okay
7,992 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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.

  • How long is the flight from Chicago to London?

    United Airlines, Turkish Airlines, and Virgin Atlantic can get you from Chicago to London in just under 8h 15m. Your travel time can differ by up to 23h 30m. There are 3939 mi between Chicago and London. This flight may include one or multiple stops.

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

    Our cheapest airline available from Chicago to London is Lufthansa. Our recent data shows that you can find tickets from as low as £358 on this airline. Additional options worth looking into are American Airlines and British Airways, starting at £386 and £412 round-trip. These flights start at 38% lower than the current average price 3 months from now.

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

    £165 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on Lufthansa and British Airways, with prices starting from £276 and £284, 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 Stansted.

  • 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 (82%), Austrian Airlines (82%), United Airlines (82%).

  • What are the cheapest flights from Chicago to London?

    On average you can expect to pay £954 for a flight from Chicago to London. The cheapest flight overall is £364 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £448.

  • 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, November is the cheapest month in which you can book a flight from Chicago to London (average of £481). Flying from Chicago to London in February is currently the most expensive (average of £993). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Milton Keynes
Croydon
Wembley
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Romford
Kingston upon Thames
Eastbourne
Ipswich
Guildford
Southall
Borehamwood
Southend-on-Sea

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.

Top 6 airlines flying from Chicago to London

Discover the top 6 airlines that operate flights from Chicago to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 22 May 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£358Average£515FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£386Average£594FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£412Average£559FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£459Average£628FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£484Average£695FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£519Average£624FlexibilityNo cancel feeOn-time77%
Search Iberia flights

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 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.