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Cheap flights from Chicago to London from £271

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 6/12. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LON
27 Dec — 3 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Chicago to London are usually found in February or September, booked 33 days in advance, depart on a Sunday or Thursday and return on a Wednesday

Cheap 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 27 November 2025.

Round-trip from

£423

One-way from

£271

Popular in

June

Cheapest in

February

Average price

£517

Good round-trip deal

£517 or less

Good one-way deal

£364 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 12/2-21/2
  • 4 total stops
  • 48h 05m total
  • Chicago to London
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6/12
  • 6/12
  • 2 total stops
  • 41h 04m total
  • Chicago to London
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Highest demand for flights based on searches. 21% potential increase in price (£118 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Chicago (CHI) to London (LON).
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Price to beat on a one-way flight from Chicago (CHI) to London (LON).
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Find 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 27 November 2025.

Wed 3/1218:30ORD - LHR
1 stop19h 00mIcelandair
Wed 10/1212:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 24/11£423
Wed 10/1215:50ORD - LGW
1 stop12h 10mMultiple Airlines
Wed 17/1208:50LGW - ORD
1 stop15h 05mMultiple Airlines
Deal found 26/11£423
Mon 1/1218:30ORD - LGW
1 stop10h 25mIcelandair
Tue 9/1211:55LGW - ORD
1 stop11h 25mIcelandair
Deal found 26/11£426
Wed 3/1215:50ORD - STN
1 stop10h 00mMultiple Airlines
Wed 10/1206:30STN - ORD
1 stop17h 25mMultiple Airlines
Deal found 26/11£427
Thu 11/1218:30ORD - LHR
1 stop10h 20mIcelandair
Thu 18/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 24/11£428
Sun 7/1219:40ORD - LGW
1 stop11h 05mMultiple Airlines
Tue 16/1211:25LGW - ORD
1 stop12h 30mMultiple Airlines
Deal found 26/11£428
Sun 30/1118:50ORD - STN
2 stops22h 35mMultiple Airlines
Wed 3/1206:50STN - ORD
2 stops19h 15mMultiple Airlines
Deal found 24/11£429
Mon 8/1220:35ORD - LHR
Nonstop7h 50mIberia
Thu 15/115:45LHR - ORD
Nonstop9h 00mIberia
Deal found 26/11£430
Tue 9/1218:30ORD - LHR
1 stop19h 00mIcelandair
Mon 15/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£431
Mon 8/1212:50ORD - LHR
1 stop12h 20mAir Canada
Thu 15/109:00LHR - ORD
2 stops16h 45mAir Canada
Deal found 26/11£432
Fri 28/1120:15ORD - LGW
1 stop31h 35mTAP AIR PORTUGAL
Sat 6/1216:35LGW - ORD
1 stop28h 10mTAP AIR PORTUGAL
Deal found 26/11£432
Thu 11/1218:30ORD - LHR
1 stop10h 20mIcelandair
Mon 15/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£433

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 27 November 2025.
Use the filters below to find and compare flights from Chicago to London that are best for you.

Fly from

Chicago

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/4

07:30-09:35

2 stops20h 05m

London Heathrow

Fri 1/5

21:05-16:10

2 stops25h 05m

£427

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 25/3

12:50-18:15

3 stops24h 25m

London Luton

Tue 31/3

15:35-19:50

3 stops34h 15m

£431

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 15/4

10:10-09:20

2 stops17h 10m

London Heathrow

Tue 28/4

19:50-16:10

2 stops26h 20m

£436

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Fri 9/1

19:20-23:25

2 stops22h 05m

London Stansted

Sun 18/1

18:45-16:45

2 stops28h 00m

£438

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sun 11/1

18:30-16:45

2 stops16h 15m

London Luton

Sat 17/1

06:00-17:20

2 stops17h 20m

£441

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/12

12:50-07:10

1 stop12h 20m

London Heathrow

Tue 16/12

07:25-10:45

Nonstop9h 20m

£442

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Fri 9/1

21:00-20:05

1 stop17h 05m

London Stansted

Fri 16/1

06:30-19:15

1 stop18h 45m

£442

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/3

18:10-06:55

Nonstop7h 45m

London Heathrow

Tue 24/3

15:45-19:45

Nonstop9h 00m

£445

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/12

10:35-06:50

1 stop14h 15m

London Heathrow

Tue 16/12

09:40-20:35

2 stops16h 55m

£455

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 7/12

09:34-06:50

2 stops15h 16m

London Heathrow

Tue 16/12

09:40-23:47

2 stops20h 07m

£455

Flights are sorted by cheapest return flights first.

Deals found on 24/11

Showing 1-10 of 60 results
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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?

Use this chart to determine the optimal time to book a return flight from Chicago to London. Price data was last updated on 21 November 2025.

The best time to book flights from Chicago to London is 33 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, May is the cheapest month in which you can book a flight from Chicago to London (average of £298). Flying from Chicago to London in July is currently the most expensive (average of £460). 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 27 November 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 36% on flights from Chicago to London by exploring options for tickets in the afternoon.

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 November 2025.

The most flights from CHI to LON are scheduled on a Monday (47 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (30 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.

Reykjavik (KEF) – chosen by Cheapflights users on 33% 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.

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £342.

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 Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 9h 50m.

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 1h 02m.

How often are flights from Chicago to London delayed?

About 24% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 169 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 Thursday 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 22% of flights being delayed.

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 November 2025.
Read reviews from past customers who have flown with Aer Lingus, Icelandair, andIberia 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.
Aer Lingus
7.2
Good
1,382 reviews
Check prices

Overall

7.2

Entertainment

6.9

Boarding

7.4

Crew

8.0

Comfort

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Aer Lingus
7.2
Good
1,382 reviews
Aer Lingus
7.2
Good
1,382 reviews
Check prices

Overall

7.2

Entertainment

6.9

Boarding

7.4

Crew

8.0

Comfort

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Icelandair
7.0
Good
582 reviews
Aer Lingus
7.2
Good
1,382 reviews
Check prices

Overall

7.2

Entertainment

6.9

Boarding

7.4

Crew

8.0

Comfort

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Iberia
7.0
Good
3,036 reviews
Aer Lingus
7.2
Good
1,382 reviews
Check prices

Overall

7.2

Entertainment

6.9

Boarding

7.4

Crew

8.0

Comfort

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Lufthansa
6.8
Okay
7,594 reviews
Aer Lingus
7.2
Good
1,382 reviews
Check prices

Overall

7.2

Entertainment

6.9

Boarding

7.4

Crew

8.0

Comfort

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
British Airways
6.7
Okay
7,539 reviews
Aer Lingus
7.2
Good
1,382 reviews
Check prices

Overall

7.2

Entertainment

6.9

Boarding

7.4

Crew

8.0

Comfort

7.1

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.

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?

    Scandinavian Airlines, United Airlines, and British Airways can get you from Chicago to London in just under 7h 45m. Your travel time can differ by up to 12h 20m. 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 £364 on this airline. Additional options worth looking into are American Airlines and Finnair, starting at £392 and £421 round-trip. These flights start at 36% lower than the current average price 3 months from now.

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

    £289 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 British Airways and Lufthansa, with prices starting from £289 and £290, 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: Gulf Air (70%), Malaysia Airlines (66%), SriLankan Airlines (65%).

  • What are the cheapest flights from Chicago to London?

    On average you can expect to pay £764 for a flight from Chicago to London. The cheapest flight overall is £298 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £295.

  • 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, May is the cheapest month in which you can book a flight from Chicago to London (average of £298). Flying from Chicago to London in July is currently the most expensive (average of £460). 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
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Slough
Croydon
Hounslow
Gatwick
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Brentford
Winchester
Crawley
Romford
Chichester
Bedford
Guildford
Ipswich

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Alternative routes for Chicago to London

See prices for flight routes from nearby airports that may be better suited for you.
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Midway to Leeds flights
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Top 7 airlines flying from Chicago to London

Discover the top 7 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 27 November 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£364Average£524FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£392Average£623FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£421Average£687FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£430Average£584FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£454Average£538FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£457Average£590FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£470Average£707FlexibilityNo cancel feeOn-time69%
Search United Airlines 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.

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