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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 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LON
24 Dec — 31 Dec1
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 24 November 2025.

Round-trip from

£427

One-way from

£271

Popular in

June

Cheapest in

February

Average price

£521

Good round-trip deal

£499 or less

Good one-way deal

£304 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 26/1-3/2
  • 3 total stops
  • 49h 35m total
  • Chicago to London
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Scandinavian Airlines
  • Scandinavian Airlines
  • 5/1
  • 1 total stop
  • 14h 40m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£119 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 24 November 2025.

Wed 3/1218:30ORD - LHR
1 stop19h 00mIcelandair
Wed 10/1212:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 24/11£427
Tue 9/1218:30ORD - LHR
1 stop19h 00mIcelandair
Thu 18/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 23/11£427
Mon 15/1218:30ORD - LGW
1 stop10h 25mIcelandair
Wed 14/111:55LGW - ORD
1 stop11h 25mIcelandair
Deal found 22/11£430
Mon 8/1218:30ORD - LGW
1 stop10h 25mIcelandair
Wed 24/1211:55LGW - ORD
1 stop11h 25mIcelandair
Deal found 23/11£430
Sun 14/1218:30ORD - LGW
1 stop10h 25mIcelandair
Wed 14/111:55LGW - ORD
1 stop11h 25mIcelandair
Deal found 22/11£433
Mon 8/1218:30ORD - LHR
1 stop10h 20mIcelandair
Wed 24/1212:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 23/11£433
Tue 9/1218:30ORD - STN
2 stops20h 50mMultiple Airlines
Thu 18/1206:30STN - ORD
2 stops16h 50mMultiple Airlines
Deal found 23/11£433
Wed 3/1218:30ORD - LHR
1 stop19h 00mIcelandair
Mon 15/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 23/11£434
Fri 28/1120:15ORD - LGW
1 stop31h 35mTAP AIR PORTUGAL
Sat 6/1216:35LGW - ORD
1 stop28h 10mTAP AIR PORTUGAL
Deal found 23/11£434
Tue 30/1218:30ORD - LGW
1 stop10h 25mIcelandair
Sat 17/111:55LGW - ORD
1 stop11h 25mIcelandair
Deal found 22/11£435
Thu 11/1218:30ORD - LHR
1 stop19h 00mIcelandair
Thu 18/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 23/11£437
Thu 11/1218:30ORD - LHR
1 stop10h 20mIcelandair
Tue 16/1212:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 22/11£437

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 24 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 - STN

ORDSTN

Chicago O'Hare Intl

Sat 7/2

19:20-23:05

2 stops21h 45m

London Stansted

Sat 14/2

21:45-16:55

2 stops25h 10m

£427

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 11/3

13:30-19:25

3 stops24h 55m

London Luton

Sun 15/3

20:50-17:45

2 stops25h 55m

£427

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 18/1

07:05-09:20

2 stops20h 15m

London Heathrow

Thu 22/1

06:40-16:45

1 stop16h 05m

£434

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/4

07:30-09:35

2 stops20h 05m

London Heathrow

Mon 27/4

07:05-16:10

2 stops15h 05m

£435

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 23/5

19:20-13:15

1 stop11h 55m

London Luton

Sun 31/5

06:25-18:10

1 stop17h 45m

£443

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Fri 16/1

18:30-20:35

2 stops20h 05m

London Stansted

Sun 18/1

05:55-17:20

2 stops17h 25m

£445

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 11/1

21:00-13:20

1 stop10h 20m

London Stansted

Sat 17/1

12:00-19:15

1 stop13h 15m

£446

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 18/1

15:45-05:55

Nonstop8h 10m

London Heathrow

Wed 28/1

06:35-18:25

1 stop17h 50m

£471

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 25/2

21:05-11:15

Nonstop8h 10m

London Heathrow

Tue 3/3

09:00-16:20

1 stop13h 20m

£471

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 18/2

21:05-11:15

Nonstop8h 10m

London Heathrow

Wed 25/2

06:50-12:10

1 stop11h 20m

£471

Flights are sorted by cheapest return flights first.

Deals found on 23/11

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 £301). Flying from Chicago to London in July is currently the most expensive (average of £463). 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 24 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 24 November 2025.

The most flights from CHI to LON are scheduled on a Saturday (45 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (25 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 38% 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 £376.

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 03m.

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 24 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
1,380 reviews
Check prices

Boarding

7.4

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Aer Lingus
7.2
Good
1,380 reviews
Aer Lingus
7.2
Good
1,380 reviews
Check prices

Boarding

7.4

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Icelandair
7.0
Good
581 reviews
Aer Lingus
7.2
Good
1,380 reviews
Check prices

Boarding

7.4

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Iberia
7.0
Good
3,033 reviews
Aer Lingus
7.2
Good
1,380 reviews
Check prices

Boarding

7.4

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Lufthansa
6.8
Okay
7,589 reviews
Aer Lingus
7.2
Good
1,380 reviews
Check prices

Boarding

7.4

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
British Airways
6.7
Okay
7,535 reviews
Aer Lingus
7.2
Good
1,380 reviews
Check prices

Boarding

7.4

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.

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 Delta can get you from Chicago to London in just under 8h 10m. Your travel time can differ by up to 12h 05m. 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 £367 on this airline. Additional options worth looking into are American Airlines and Finnair, starting at £395 and £424 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?

    £272 is the cheapest one-way deal found within the past few days, from Scandinavian Airlines. You may also be able to find cheap deals on Iberia and TAP AIR PORTUGAL, with prices starting from £274 and £275, 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 £453 for a flight from Chicago to London. The cheapest flight overall is £288 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £329.

  • 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 £301). Flying from Chicago to London in July is currently the most expensive (average of £463). 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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Deal
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Ipswich
Bedford
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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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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 24 November 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£367Average£530FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£395Average£628FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£424Average£690FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£457Average£542FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£460Average£595FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£461Average£587FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£474Average£632FlexibilityNo 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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