How long is the flight from Chicago to London?

United Airlines, Delta, and Icelandair can get you from Chicago to London in just under 8h 20m. Your travel time can differ by up to 2h 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 £353 on this airline. Additional options worth looking into are American Airlines and Finnair, starting at £380 and £408 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?

£238 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on SWISS and ITA Airways, with prices starting from £286 and £292, 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.

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 £394 for a flight from Chicago to London. The cheapest flight overall is £255 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £312.

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 (71%), American Airlines (68%), Alaska Airlines (68%).

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.

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.

£169+ Cheap Flights from Chicago to London

Cheapflights Tip: The best prices from Chicago to London are usually found in February or September, booked 59 days in advance, depart on a Thursday or Sunday and return on a Wednesday

Cheap flight deals from Chicago to London

Round-trip from	£370
One-way from	£169
Popular in	June
Cheapest in	February
Average price	£483
Good round-trip deal	£438 or less
Good one-way deal	£274 or less

28/1-4/2
4 total stops
29h 46m total
Chicago to London

Search Deals

WestJet
25/10
1 total stop
14h 20m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£112 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 September 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 17 September 2025.

Wed 5/1112:50ORD - LHR

1 stop12h 20mAir Canada

Tue 11/1109:00LHR - ORD

2 stops15h 39mAir Canada

Deal found 15/9£370

Mon 1/1218:30ORD - STN

2 stops13h 50mMultiple Airlines

Sun 14/1206:30STN - ORD

2 stops16h 50mMultiple Airlines

Deal found 15/9£370

Fri 10/1021:12ORD - LHR

2 stops17h 48mMultiple Airlines

Sun 12/1006:00LHR - ORD

1 stop13h 20mMultiple Airlines

Deal found 15/9£371

Wed 5/1118:30ORD - LGW

2 stops16h 50mMultiple Airlines

Tue 11/1108:50LGW - ORD

2 stops14h 30mMultiple Airlines

Deal found 14/9£371

Sun 28/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 21/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 15/9£372

Mon 6/1019:51ORD - LGW

1 stop32h 09mMultiple Airlines

Thu 9/1014:00LGW - ORD

1 stop34h 46mMultiple Airlines

Deal found 15/9£372

Fri 28/1118:30ORD - STN

2 stops20h 05mMultiple Airlines

Fri 5/1205:55STN - ORD

2 stops17h 25mMultiple Airlines

Deal found 14/9£372

Mon 22/921:50ORD - LHR

Nonstop7h 55mAir Canada

Tue 30/908:30LHR - ORD

Nonstop9h 00mAir Canada

Deal found 15/9£372

Wed 5/1118:30ORD - LTN

2 stops22h 35mMultiple Airlines

Wed 12/1106:50LTN - ORD

2 stops16h 30mMultiple Airlines

Deal found 15/9£373

Sun 28/907:11ORD - LHR

1 stop17h 19mAir Canada

Tue 7/1006:50LHR - ORD

2 stops13h 58mAir Canada

Deal found 15/9£373

Tue 23/922:35ORD - LHR

Nonstop7h 40mFinnair

Fri 3/1014:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 16/9£374

Fri 28/1118:30ORD - LGW

2 stops18h 15mMultiple Airlines

Thu 4/1220:50LGW - ORD

2 stops26h 30mMultiple Airlines

Deal found 15/9£374

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 17 September 2025.

Sun 28/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 21/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 15/9£372

Fri 28/1118:30ORD - STN

2 stops20h 05mMultiple Airlines

Fri 5/1205:55STN - ORD

2 stops17h 25mMultiple Airlines

Deal found 14/9£372

Tue 14/1018:20ORD - LHR

1 stop10h 40mDelta

Wed 29/1009:00LHR - ORD

1 stop12h 10mDelta

Deal found 15/9£377

Wed 25/217:10ORD - LHR

Nonstop7h 45mBritish Airways

Tue 10/311:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 16/9£380

Mon 17/1118:30ORD - LGW

1 stop10h 25mIcelandair

Tue 25/1111:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 15/9£380

Mon 27/1018:23MDW - LHR

1 stop9h 22mKLM

Tue 11/1111:05LHR - MDW

1 stop13h 13mKLM

Deal found 15/9£390

Wed 21/113:05MDW - LHR

1 stop12h 45mVirgin Atlantic

Wed 4/306:20LHR - MDW

2 stops17h 48mVirgin Atlantic

Deal found 16/9£390

Tue 21/1010:40ORD - LHR

1 stop16h 55mUnited Airlines

Mon 27/1016:40LHR - ORD

1 stop27h 30mUnited Airlines

Deal found 15/9£375

Wed 3/1218:30ORD - LTN

2 stops22h 35mMultiple Airlines

Tue 9/1209:00LTN - ORD

2 stops14h 20mMultiple Airlines

Deal found 14/9£375

Wed 1/1018:28ORD - LHR

1 stop10h 57mDelta

Tue 21/1006:30LHR - ORD

1 stop13h 40mDelta

Deal found 15/9£378

Mon 17/1118:30ORD - LGW

1 stop10h 25mIcelandair

Mon 24/1111:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 15/9£380

Tue 20/114:00MDW - LHR

1 stop11h 05mKLM

Thu 5/313:00LHR - MDW

1 stop11h 34mKLM

Deal found 16/9£396

Tue 14/1014:00ORD - STN

2 stops16h 00mMultiple Airlines

Tue 21/1021:45STN - ORD

2 stops28h 32mMultiple Airlines

Deal found 15/9£378

Sun 28/920:10ORD - LHR

1 stop11h 00mDelta

Tue 21/1008:40LHR - ORD

1 stop11h 30mDelta

Deal found 16/9£378

Tue 21/1018:00ORD - LHR

Nonstop8h 20mUnited Airlines

Wed 29/1013:35LHR - ORD

Nonstop9h 25mUnited Airlines

Deal found 15/9£379

Wed 19/1118:30ORD - LGW

1 stop10h 25mIcelandair

Wed 26/1111:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 14/9£380

Wed 5/1113:26ORD - LCY

2 stops13h 24mVirgin Atlantic

Wed 12/1109:20LCY - ORD

1 stop11h 00mVirgin Atlantic

Deal found 15/9£419

Tue 20/114:00MDW - LHR

1 stop11h 05mKLM

Wed 4/308:55LHR - MDW

1 stop13h 30mKLM

Deal found 16/9£396

Tue 30/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Thu 16/1009:30LHR - ORD

1 stop11h 18mUnited Airlines

Deal found 15/9£379

Tue 18/1118:30ORD - LGW

1 stop10h 25mIcelandair

Tue 25/1111:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 15/9£380

Tue 14/1016:15ORD - LCY

1 stop21h 25mVirgin Atlantic

Tue 21/1009:20LCY - ORD

2 stops17h 03mVirgin Atlantic

Deal found 14/9£424

Wed 26/1118:30ORD - LTN

2 stops21h 50mMultiple Airlines

Tue 2/1206:50LTN - ORD

2 stops16h 30mMultiple Airlines

Deal found 16/9£386

Wed 22/1017:04MDW - LHR

1 stop12h 06mDelta

Tue 28/1008:55LHR - MDW

1 stop18h 19mDelta

Deal found 17/9£390

Wed 21/114:00MDW - LHR

1 stop11h 05mKLM

Wed 4/311:05LHR - MDW

1 stop13h 03mKLM

Deal found 16/9£396

Sun 28/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 17/1008:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 16/9£380

Tue 2/1218:30ORD - LGW

1 stop10h 25mIcelandair

Sun 7/1211:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 16/9£381

Wed 26/1118:30ORD - STN

2 stops20h 25mMultiple Airlines

Mon 1/1221:20STN - ORD

2 stops26h 00mMultiple Airlines

Deal found 16/9£390

Mon 19/113:05MDW - LHR

1 stop11h 20mDelta

Fri 6/313:00LHR - MDW

1 stop11h 34mDelta

Deal found 16/9£396

Wed 15/1015:35ORD - LHR

1 stop12h 00mUnited Airlines

Wed 29/1007:40LHR - ORD

Nonstop9h 20mUnited Airlines

Deal found 16/9£380

Sun 8/319:30ORD - LGW

1 stop10h 25mIcelandair

Mon 16/311:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 16/9£381

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 17 September 2025.

Sun 28/918:00ORD - LHR

Nonstop8h 20mAir Canada

Tue 7/1014:10LHR - ORD

Nonstop9h 10mAir Canada

Deal found 16/9£372

Wed 21/117:10ORD - LHR

Nonstop7h 45mFinnair

Tue 27/112:35LHR - ORD

Nonstop8h 50mFinnair

Deal found 16/9£374

Tue 14/1019:10ORD - LHR

Nonstop7h 55mBritish Airways

Tue 21/1013:10LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 15/9£375

Wed 3/1217:10ORD - LHR

Nonstop7h 45mIberia

Wed 10/1211:00LHR - ORD

Nonstop8h 50mIberia

Deal found 14/9£376

Wed 11/318:10ORD - LHR

Nonstop7h 45mFinnair

Wed 25/311:00LHR - ORD

Nonstop8h 50mFinnair

Deal found 15/9£378

Sun 28/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 7/1014:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 15/9£379

Sun 28/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 17/1008:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 16/9£380

Thu 30/1018:50ORD - LHR

Nonstop8h 05mLufthansa

Thu 6/1110:25LHR - ORD

Nonstop9h 20mLufthansa

Deal found 15/9£386

Sun 1/317:10ORD - LHR

Nonstop7h 45mBritish Airways

Wed 6/509:15LHR - ORD

Nonstop8h 40mBritish Airways

Deal found 15/9£387

Tue 30/922:35ORD - LHR

Nonstop7h 40mBritish Airways

Wed 8/1011:05LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 16/9£396

Last-minute flights from Chicago to London
Discover last-minute flight deals from Chicago to London. Data last updated 17 September 2025 and is based on user searches.

Mon 22/921:50ORD - LHR

Nonstop7h 55mAir Canada

Tue 30/909:30LHR - ORD

1 stop11h 25mAir Canada

Deal found 15/9£370

Mon 22/917:40ORD - LHR

Nonstop7h 40mIberia

Tue 21/1012:15LHR - ORD

Nonstop8h 25mIberia

Deal found 15/9£375

Mon 22/908:40ORD - STN

2 stops20h 00mMultiple Airlines

Tue 30/907:15STN - ORD

2 stops32h 36mMultiple Airlines

Deal found 15/9£375

Mon 22/910:40ORD - LHR

1 stop13h 45mDelta

Tue 7/1006:30LHR - ORD

1 stop13h 40mDelta

Deal found 15/9£378

Tue 23/922:35ORD - LHR

Nonstop7h 40mFinnair

Fri 3/1014:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 16/9£374

Wed 24/908:40ORD - LHR

1 stop15h 50mUnited Airlines

Tue 7/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 16/9£372

Fri 3/1017:17ORD - LGW

1 stop34h 43mMultiple Airlines

Mon 6/1014:00LGW - ORD

1 stop33h 53mMultiple Airlines

Deal found 15/9£375

Sun 5/1022:15ORD - LGW

1 stop10h 25mIcelandair

Tue 14/1015:40LGW - ORD

1 stop32h 35mIcelandair

Deal found 16/9£376

Mon 6/1019:51ORD - LGW

1 stop32h 09mMultiple Airlines

Thu 9/1014:00LGW - ORD

1 stop34h 46mMultiple Airlines

Deal found 15/9£372

Tue 14/1019:05ORD - LGW

1 stop16h 45mSWISS

Tue 21/1018:35LGW - ORD

1 stop27h 20mSWISS

Deal found 15/9£375

Wed 22/1010:40ORD - STN

2 stops21h 10mMultiple Airlines

Tue 28/1021:20STN - ORD

2 stops25h 00mMultiple Airlines

Deal found 15/9£372

Wed 29/1019:50ORD - LGW

1 stop17h 00mSWISS

Mon 3/1118:40LGW - ORD

1 stop27h 40mSWISS

Deal found 14/9£377

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 17 September 2025.

Sat 25/1017:30ORD - LHR

1 stop14h 20mWestJet

Deal found 15/9£169

Fri 28/1120:15ORD - STN

2 stops21h 55mMultiple Airlines

Deal found 13/9£169

Wed 12/1119:10ORD - LTN

2 stops19h 55mMultiple Airlines

Deal found 13/9£171

Sun 19/1021:54ORD - LGW

2 stops50h 26mMultiple Airlines

Deal found 15/9£171

Fri 17/1019:43ORD - LGW

2 stops28h 37mMultiple Airlines

Deal found 14/9£172

Sat 18/1018:15ORD - LGW

1 stop33h 30mTAP AIR PORTUGAL

Deal found 14/9£172

Thu 20/1106:20MDW - LGW

2 stops32h 20mMultiple Airlines

Deal found 14/9£173

Sat 27/917:40ORD - LGW

2 stops30h 40mMultiple Airlines

Deal found 15/9£173

Wed 12/1119:10ORD - STN

2 stops21h 05mMultiple Airlines

Deal found 13/9£173

Wed 5/1119:10ORD - LTN

2 stops21h 10mMultiple Airlines

Deal found 15/9£174

Sun 2/1120:25ORD - LGW

1 stop31h 25mTAP AIR PORTUGAL

Deal found 14/9£174

Fri 24/1018:00ORD - STN

2 stops23h 10mMultiple Airlines

Deal found 15/9£174

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Tue 21/10

06:50-12:05

1 stop11h 15m

£372

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Fri 28/11

18:30-20:35

2 stops20h 05m

London Stansted

Fri 5/12

05:55-17:20

2 stops17h 25m

£372

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 21/10

10:40-09:35

1 stop16h 55m

London Heathrow

Mon 27/10

16:40-15:10

1 stop27h 30m

£375

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 3/12

18:30-23:05

2 stops22h 35m

London Luton

Tue 9/12

09:00-17:20

2 stops14h 20m

£375

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 14/10

18:20-11:00

1 stop10h 40m

London Heathrow

Wed 29/10

09:00-16:10

1 stop12h 10m

£377

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 1/10

18:28-11:25

1 stop10h 57m

London Heathrow

Tue 21/10

06:30-14:10

1 stop13h 40m

£378

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 14/10

14:00-12:00

2 stops16h 00m

London Stansted

Tue 21/10

21:45-20:17

2 stops28h 32m

£378

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/9

20:10-13:10

1 stop11h 00m

London Heathrow

Tue 21/10

08:40-14:10

1 stop11h 30m

£378

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 21/10

18:00-08:20

Nonstop8h 20m

London Heathrow

Wed 29/10

13:35-18:00

Nonstop9h 25m

£379

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Thu 16/10

09:30-14:48

1 stop11h 18m

£379

Flights are sorted by cheapest return flights first.

Deals found on 13/9

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 59 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 41% on flights from Chicago to London by exploring options for tickets in the morning.

Weekly flight availability from Chicago to London

The most flights from CHI to LON are scheduled on a Tuesday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (46 on average).

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

Reykjavik (KEF) – chosen by Cheapflights users on 44% of one-stop itineraries from Chicago to London on Cheapflights.

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

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £329.

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

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?

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 1h 03m.

Reviews of airlines servicing London

Read reviews from past customers who have flown with United Airlines, 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.

United Airlines

7.4

Good

8,924 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

8,924 reviews

United Airlines

7.4

Good

8,924 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Icelandair

7.0

Good

544 reviews

United Airlines

7.4

Good

8,924 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Iberia

7.0

Good

2,924 reviews

United Airlines

7.4

Good

8,924 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Lufthansa

6.8

Okay

7,407 reviews

United Airlines

7.4

Good

8,924 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

British Airways

6.7

Okay

7,363 reviews

United Airlines

7.4

Good

8,924 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

How long is the flight from Chicago to London?
United Airlines, Delta, and Icelandair can get you from Chicago to London in just under 8h 20m. Your travel time can differ by up to 2h 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 £353 on this airline. Additional options worth looking into are American Airlines and Finnair, starting at £380 and £408 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?
£238 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on SWISS and ITA Airways, with prices starting from £286 and £292, 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 (71%), American Airlines (68%), Alaska Airlines (68%).
What are the cheapest flights from Chicago to London?
On average you can expect to pay £394 for a flight from Chicago to London. The cheapest flight overall is £255 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £312.
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

Milton Keynes

Croydon

Hounslow

Slough

Gatwick

Luton

Deal

Wembley

Ilford

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Hayes

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Alternative routes for Chicago to London

Top 7 airlines flying from Chicago to London

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£353	Average£541	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£380	Average£619	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Finnair	Cheapest£408	Average£641	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£439	Average£531	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Aer Lingus	Cheapest£442	Average£571	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£452	Average£605	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£455	Average£685	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

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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.

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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.

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Yes! Cheapflights helps users easily find flights from Chicago to London with no change fees.

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Cheap flights from Chicago to London from £169

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 25/10. 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 September, booked 59 days in advance, depart on a Thursday or Sunday and return on a Wednesday

Cheap flight deals from Chicago to London

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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 17 September 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 17 September 2025.

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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 12 September 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 17 September 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 17 September 2025.

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.

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.

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.

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.

Reviews of airlines servicing London

Read reviews from past customers who have flown with United Airlines, 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.

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?

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?

Travelling to a place near London?

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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.

Top 7 airlines flying from Chicago to London

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How does Cheapflights help users find flights from Chicago to London?

Why should you use Cheapflights to find cheap flight tickets from Chicago to London?

Can Cheapflights find flights from Chicago to London with no change fees?

Can Cheapflights notify me if prices for flights from Chicago to London become cheaper?

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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 17 September 2025.