How long is the flight from Chicago O'Hare Intl Airport to London?

For as low as £374, United Airlines can have you in London from Chicago O'Hare Intl Airport in 8h 10m. Chicago O'Hare Intl Airport and London are separated by a distance of 3939 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines flying from Chicago O'Hare Intl Airport to London round-trip?

According to our current data, Lufthansa (£355), Finnair (£410), and Iberia (£442) offers the cheapest pricing from Chicago O'Hare Intl Airport to London. Users have found that Lufthansa is 37% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to London one-way?

The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as £175. However, be on the lookout for offers from JetBlue and SWISS, as they are both options that can get you from Chicago O'Hare Intl Airport to London for a low price.

What is the cheapest day to fly from Chicago O'Hare Intl Airport to London?

Travellers seeking maximum savings on their Chicago O'Hare Intl Airport to London flight should consider departing on Monday mornings when fares are most often at their lowest. Saturday evenings 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 O'Hare Intl Airport to London?

The most popular flight routes from Chicago O'Hare Intl Airport to London are Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick and Chicago O'Hare Intl - London City.

What are the cheapest flights from Chicago O'Hare Intl Airport to London?

Looking for the cheapest flight from Chicago O'Hare Intl Airport to London? While on average our users pay £404, our data indicates the cheapest price to be £257. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £312.

What are the most reliable airlines from Chicago O'Hare Intl Airport to London?

No one likes to see their flight delayed. When booking a flight from Chicago O'Hare Intl Airport to London consider choosing Aer Lingus (64%), American Airlines (62%) or Air Canada (62%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Chicago O'Hare Intl Airport to London?

When booking a flight from Chicago O'Hare Intl Airport to London, you may want to consider flying on American Airlines, Finnair or British Airways as they are the most popular for this route.

What is the cheapest day to fly round-trip from Chicago O'Hare Intl Airport to London?

Flights from Chicago O'Hare Intl Airport to London are found to be more expensive on Friday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

How far in advance should I book a flight from Chicago O'Hare Intl Airport to London?

To save up to 11% on this flight, we recommend booking at least 60 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Chicago O'Hare Intl Airport to London from £508 1-2 weeks out and tickets from £524 for flights departing within the next 72 hours.

What is the cheapest month to fly from Chicago O'Hare Intl Airport to London?

Our data shows that February tends to be the cheapest month to fly to London from Chicago O'Hare Intl Airport. Users have commonly found prices around £562 for the month, but tickets can be as low as £342. Due to multiple factors, prepare for potentially higher prices in June.

Can I find deals for flights from O'Hare Intl to London that include hotel bookings?

Yes. In addition to deals on O'Hare Intl to London flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from O'Hare Intl to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to London.

Can I find deals for business class flights from O'Hare Intl to London?

Yes. Cheapflights offers flight deals from O'Hare Intl 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.

£170+ Flights from Chicago O'Hare Intl Airport to London

Cheapflights Tip: The best prices from Chicago O'Hare Intl to London are usually found in February or April, booked 17 days in advance, depart on a Thursday or Sunday and return on a Wednesday

Cheap flight deals from O'Hare Intl to London

Round-trip from	£373
One-way from	£170
Popular in	June
Cheapest in	February
Average price	£495
Good round-trip deal	£361 or less
Good one-way deal	£276 or less

19/10-4/11
3 total stops
29h 29m total
Chicago to London

Search Deals

25/9
2 total stops
19h 10m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 20% potential increase in price (£109 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£20 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 O'Hare Intl to London (LON).

Search Deals

Price to beat on a one-way flight from Chicago O'Hare Intl to London (LON).

Search Deals

Find flight deals from O'Hare Intl to London

Cheapest flights from O'Hare Intl to London
Explore the most affordable flight options available from O'Hare Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Sun 19/1010:40ORD - LHR

1 stop13h 50mMultiple Airlines

Tue 4/1109:00LHR - ORD

2 stops15h 39mMultiple Airlines

Deal found 10/9£373

Mon 27/1019:50ORD - LGW

1 stop17h 00mSWISS

Mon 3/1118:40LGW - ORD

1 stop27h 40mSWISS

Deal found 11/9£373

Mon 10/1118:30ORD - LTN

1 stop13h 30mMultiple Airlines

Sun 23/1106:00LTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 10/9£374

Wed 24/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Tue 14/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 10/9£374

Tue 30/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 7/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 11/9£374

Tue 14/1015:50ORD - LHR

1 stop10h 45mMultiple Airlines

Mon 20/1019:30LHR - ORD

1 stop23h 50mMultiple Airlines

Deal found 10/9£375

Wed 3/1206:40ORD - LGW

1 stop17h 20mMultiple Airlines

Tue 9/1213:00LGW - ORD

1 stop29h 45mMultiple Airlines

Deal found 10/9£375

Fri 24/1019:25ORD - STN

2 stops18h 25mMultiple Airlines

Sun 2/1108:30STN - ORD

2 stops14h 50mMultiple Airlines

Deal found 12/9£375

Wed 3/1218:30ORD - LTN

1 stop12h 25mMultiple Airlines

Thu 11/1206:00LTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 10/9£376

Thu 18/921:31ORD - LHR

1 stop27h 24mUnited Airlines

Sun 21/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 10/9£376

Tue 30/911:13ORD - LGW

1 stop13h 07mMultiple Airlines

Sat 15/1106:05LGW - ORD

2 stops38h 55mMultiple Airlines

Deal found 11/9£376

Sun 16/1118:30ORD - LTN

1 stop14h 20mMultiple Airlines

Sun 23/1106:00LTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 11/9£377

Best flights from O'Hare Intl to London
Discover carefully curated flight deals from O'Hare Intl to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2025.

Mon 1/1221:05ORD - LHR

Nonstop8h 10mUnited Airlines

Tue 9/1206:50LHR - ORD

1 stop11h 20mUnited Airlines

Deal found 10/9£374

Wed 3/1218:30ORD - LTN

1 stop12h 25mMultiple Airlines

Thu 11/1206:00LTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 10/9£376

Tue 30/919:10ORD - LHR

Nonstop7h 55mBritish Airways

Fri 14/1115:45LHR - ORD

Nonstop9h 00mBritish Airways

Deal found 11/9£382

Sun 8/218:30ORD - LGW

1 stop10h 25mIcelandair

Fri 20/211:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 10/9£382

Wed 15/1016:40ORD - LCY

1 stop10h 50mKLM

Wed 22/1009:20LCY - ORD

1 stop11h 20mKLM

Deal found 11/9£419

Tue 11/1113:09ORD - LCY

2 stops13h 41mVirgin Atlantic

Tue 18/1117:50LCY - ORD

1 stop26h 30mVirgin Atlantic

Deal found 11/9£422

Thu 16/1019:05ORD - LCY

1 stop11h 25mSWISS

Wed 22/1009:25LCY - ORD

1 stop12h 30mSWISS

Deal found 11/9£464

Wed 12/1117:50ORD - LHR

Nonstop8h 05mUnited Airlines

Wed 19/1106:50LHR - ORD

1 stop11h 20mUnited Airlines

Deal found 10/9£374

Tue 2/1221:45ORD - LHR

Nonstop7h 50mBritish Airways

Wed 10/1211:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 11/9£382

Tue 10/218:30ORD - LGW

1 stop10h 25mIcelandair

Tue 17/211:55LGW - ORD

1 stop11h 25mIcelandair

Deal found 10/9£382

Tue 21/1010:40ORD - STN

2 stops24h 30mMultiple Airlines

Tue 28/1021:20STN - ORD

2 stops27h 05mMultiple Airlines

Deal found 11/9£388

Sun 28/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 7/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 11/9£374

Direct flights from O'Hare Intl to London
Explore direct flight options from O'Hare Intl to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 12 September 2025.

Mon 22/916:55ORD - LHR

Nonstop7h 55mBritish Airways

Tue 21/1009:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 11/9£378

Wed 21/121:45ORD - LHR

Nonstop7h 50mFinnair

Tue 27/111:00LHR - ORD

Nonstop8h 50mFinnair

Deal found 10/9£379

Wed 29/1021:45ORD - LHR

Nonstop7h 40mFinnair

Wed 5/1112:35LHR - ORD

Nonstop8h 50mFinnair

Deal found 10/9£379

Mon 27/1018:10ORD - LHR

Nonstop7h 45mBritish Airways

Wed 12/1111:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 10/9£381

Wed 24/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Tue 30/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 11/9£382

Fri 3/1016:00ORD - LHR

Nonstop8h 20mLufthansa

Tue 7/1014:10LHR - ORD

Nonstop9h 10mLufthansa

Deal found 11/9£388

Thu 16/1016:00ORD - LHR

Nonstop8h 20mLufthansa

Wed 22/1008:30LHR - ORD

Nonstop9h 00mLufthansa

Deal found 10/9£389

Mon 29/921:25ORD - LHR

Nonstop8h 20mLufthansa

Tue 7/1014:10LHR - ORD

Nonstop9h 10mLufthansa

Deal found 11/9£390

Sun 1/317:10ORD - LHR

Nonstop7h 45mBritish Airways

Wed 6/509:15LHR - ORD

Nonstop8h 40mBritish Airways

Deal found 10/9£393

Tue 30/1221:45ORD - LHR

Nonstop7h 50mBritish Airways

Tue 12/515:30LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 10/9£394

Sun 28/922:35ORD - LHR

Nonstop7h 40mIberia

Tue 21/1009:15LHR - ORD

Nonstop8h 35mIberia

Deal found 11/9£397

Last-minute flights from O'Hare Intl to London
Discover last-minute flight deals from O'Hare Intl to London. Data last updated 12 September 2025 and is based on user searches.

Sun 14/922:15ORD - LHR

1 stop31h 40mIcelandair

Tue 30/921:25LHR - ORD

1 stop29h 50mIcelandair

Deal found 10/9£377

Thu 18/921:31ORD - LHR

1 stop27h 24mUnited Airlines

Sun 21/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 10/9£376

Mon 22/916:55ORD - LHR

Nonstop7h 55mBritish Airways

Tue 21/1009:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 11/9£378

Wed 24/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Tue 14/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 10/9£374

Wed 24/913:12ORD - LHR

1 stop10h 43mUnited Airlines

Tue 7/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 11/9£377

Wed 24/913:00ORD - LHR

1 stop11h 25mDelta

Fri 3/1006:30LHR - ORD

1 stop13h 40mDelta

Deal found 11/9£380

Tue 30/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 7/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 11/9£374

Tue 30/910:40ORD - LHR

1 stop13h 45mDelta

Wed 19/1109:00LHR - ORD

1 stop12h 10mDelta

Deal found 11/9£379

Tue 14/1015:50ORD - LHR

1 stop10h 45mMultiple Airlines

Mon 20/1019:30LHR - ORD

1 stop23h 50mMultiple Airlines

Deal found 10/9£375

Sun 19/1010:40ORD - LHR

1 stop13h 50mMultiple Airlines

Tue 4/1109:00LHR - ORD

2 stops15h 39mMultiple Airlines

Deal found 10/9£373

Wed 22/1018:00ORD - LHR

Nonstop8h 20mUnited Airlines

Mon 27/1016:40LHR - ORD

1 stop27h 30mUnited Airlines

Deal found 11/9£379

Fri 24/1019:25ORD - STN

2 stops18h 25mMultiple Airlines

Sun 2/1108:30STN - ORD

2 stops14h 50mMultiple Airlines

Deal found 12/9£375

One-way flights from O'Hare Intl to London
Search for one-way flight options from O'Hare Intl to London. Find affordable one-way fares based on user searches. Data last updated 12 September 2025.

Thu 25/905:10ORD - LGW

2 stops19h 10mMultiple Airlines

Deal found 11/9£170

Wed 12/1119:10ORD - LHR

1 stop14h 20mTAP AIR PORTUGAL

Deal found 11/9£171

Fri 14/1120:15ORD - LHR

1 stop34h 25mTAP AIR PORTUGAL

Deal found 11/9£172

Mon 3/1106:40ORD - LGW

2 stops31h 55mMultiple Airlines

Deal found 11/9£173

Wed 12/1119:10ORD - LTN

2 stops19h 55mMultiple Airlines

Deal found 11/9£174

Fri 24/1018:00ORD - LGW

1 stop34h 50mTAP AIR PORTUGAL

Deal found 12/9£174

Sun 12/1017:30ORD - LHR

1 stop36h 35mWestJet

Deal found 11/9£174

Mon 17/1106:40ORD - LHR

2 stops32h 55mMultiple Airlines

Deal found 11/9£175

Sun 19/1018:00ORD - LGW

1 stop33h 45mTAP AIR PORTUGAL

Deal found 12/9£175

Wed 12/1119:10ORD - STN

2 stops21h 05mMultiple Airlines

Deal found 11/9£175

Mon 20/1010:27ORD - LHR

2 stops26h 23mMultiple Airlines

Deal found 10/9£176

Sat 27/917:17ORD - LGW

1 stop34h 53mMultiple Airlines

Deal found 10/9£176

Cheapflights Fare Finder

Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 1/12

21:05-11:15

Nonstop8h 10m

London Heathrow

Tue 9/12

06:50-12:10

1 stop11h 20m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 12/11

17:50-07:55

Nonstop8h 05m

London Heathrow

Wed 19/11

06:50-12:10

1 stop11h 20m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Tue 7/10

06:50-12:05

1 stop11h 15m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 29/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Tue 7/10

06:50-12:05

1 stop11h 15m

£374

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 3/12

18:30-12:55

1 stop12h 25m

London Luton

Thu 11/12

06:00-17:20

1 stop17h 20m

£376

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 1/11

20:18-09:40

1 stop32h 22m

London Heathrow

Mon 10/11

12:05-16:20

1 stop34h 15m

£379

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

19:10-09:05

Nonstop7h 55m

London Heathrow

Fri 14/11

15:45-18:45

Nonstop9h 00m

£382

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 2/12

21:45-11:35

Nonstop7h 50m

London Heathrow

Wed 10/12

11:00-13:50

Nonstop8h 50m

£382

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 24/9

10:40-06:30

1 stop13h 50m

London Heathrow

Tue 30/9

14:05-14:55

1 stop30h 50m

£382

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 8/2

18:30-10:55

1 stop10h 25m

London Gatwick

Fri 20/2

11:55-17:20

1 stop11h 25m

£382

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Showing 1-10 of 60 results

...

Best time to book a flight from O'Hare Intl to London

Have a flexible travel schedule? Discover the best time to fly to London from O'Hare Intl 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 O'Hare Intl Airport to London

How far ahead should I book a flight from Chicago O'Hare Intl Airport to London?

The price you pay for your flight from Chicago O'Hare Intl Airport to London may vary depending on when you book. For the best chance of a lower fare, look to book 17 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to London?

Currently, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London (average of £112). Flying from Chicago O'Hare Intl Airport 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 ORD to LON?

It’s typically best to fly out from Chicago O'Hare Intl Airport to London in the morning. Doing so could potentially save you 33% on the flight price compared to flying at midday, which is usually more expensive.

Weekly flight availability from Chicago O'Hare Intl Airport to London

The most flights from ORD to LON are scheduled on a Tuesday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (52 on average).

What’s the top stopover airport for flights from Chicago O'Hare Intl Airport to London?

Reykjavik (KEF) – chosen by Cheapflights users on 42% of one-stop itineraries from Chicago O'Hare Intl Airport to London on Cheapflights.

What’s the cheapest stopover airport for flights from Chicago O'Hare Intl Airport to London?

Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £331.

What’s the fastest stopover option from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to London?

Flights via Amsterdam (AMS) offer the fastest connection on this route, with an average stopover time of 1h 08m.

Reviews of airlines servicing London

Get a feel of what it's like to fly with United Airlines, Icelandair, andIberia from Chicago O'Hare Intl Airport to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,937 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

8,937 reviews

United Airlines

7.4

Good

8,937 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

546 reviews

United Airlines

7.4

Good

8,937 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

2,929 reviews

United Airlines

7.4

Good

8,937 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

7,409 reviews

United Airlines

7.4

Good

8,937 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

7,361 reviews

United Airlines

7.4

Good

8,937 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 O'Hare Intl Airport to London?
For as low as £374, United Airlines can have you in London from Chicago O'Hare Intl Airport in 8h 10m. Chicago O'Hare Intl Airport and London are separated by a distance of 3939 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from Chicago O'Hare Intl Airport to London round-trip?
According to our current data, Lufthansa (£355), Finnair (£410), and Iberia (£442) offers the cheapest pricing from Chicago O'Hare Intl Airport to London. Users have found that Lufthansa is 37% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to London one-way?
The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as £175. However, be on the lookout for offers from JetBlue and SWISS, as they are both options that can get you from Chicago O'Hare Intl Airport to London for a low price.
What are the most popular routes from Chicago O'Hare Intl Airport to London?
The most popular flight routes from Chicago O'Hare Intl Airport to London are Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick and Chicago O'Hare Intl - London City.
What are the most reliable airlines from Chicago O'Hare Intl Airport to London?
No one likes to see their flight delayed. When booking a flight from Chicago O'Hare Intl Airport to London consider choosing Aer Lingus (64%), American Airlines (62%) or Air Canada (62%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Chicago O'Hare Intl Airport to London?
Looking for the cheapest flight from Chicago O'Hare Intl Airport to London? While on average our users pay £404, our data indicates the cheapest price to be £257. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £312.
Can I find deals for flights from O'Hare Intl to London that include hotel bookings?
Yes. In addition to deals on O'Hare Intl to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from O'Hare Intl to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to London.
Can I find deals for business class flights from O'Hare Intl to London?
Yes. Cheapflights offers flight deals from O'Hare Intl 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 O'Hare Intl Airport to London?
Currently, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London (average of £112). Flying from Chicago O'Hare Intl Airport 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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Croydon

Hounslow

Gatwick

Slough

Luton

Deal

Wembley

Ilford

Crawley

Hayes

Watford

Folkestone

Winchester

Chichester

Ipswich

Dartford

Eastbourne

Guildford

Bishop's Stortford

Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from O'Hare Intl to London

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£355	Average£545	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Finnair	Cheapest£410	Average£645	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£442	Average£539	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Aer Lingus	Cheapest£445	Average£576	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£455	Average£602	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£458	Average£689	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
American Airlines	Cheapest£495	Average£623	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

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Cheap flights from Chicago O'Hare Intl Airport to London from £170

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 25/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Chicago O'Hare Intl to London are usually found in February or April, booked 17 days in advance, depart on a Thursday or Sunday and return on a Wednesday

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Cheapest flights from O'Hare Intl to LondonExplore the most affordable flight options available from O'Hare Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Explore the most affordable flight options available from O'Hare Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

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Best time to book a flight from O'Hare Intl to London

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Everything you need to know about your flight from Chicago O'Hare Intl Airport to London

How far ahead should I book a flight from Chicago O'Hare Intl Airport to London?

Use this chart to determine the optimal time to book a return flight from O'Hare Intl to London. Price data was last updated on 29 August 2025.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to London?

What is the cheapest time of day to fly from ORD to LON?

Find hourly flight availability from O'Hare Intl 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 12 September 2025.

Weekly flight availability from Chicago O'Hare Intl Airport to London

What’s the top stopover airport for flights from Chicago O'Hare Intl Airport to London?

Share of one-stop return flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to London?

Average return fare for one-stop flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to London?

Shortest average travel time for one-stop one-way flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to London?

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

Reviews of airlines servicing London

Get a feel of what it's like to fly with United Airlines, Icelandair, andIberia from Chicago O'Hare Intl Airport to London by reading reviews from past customers. Users have also rated airlines 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 O'Hare Intl 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 O'Hare Intl Airport to London?

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What are the cheapest flights from Chicago O'Hare Intl Airport to London?

Can I find deals for flights from O'Hare Intl to London that include hotel bookings?

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Alternative routes for O'Hare Intl to London

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Top 7 airlines flying from O'Hare Intl to London

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Can Cheapflights find flights from O'Hare Intl to London with no change fees?

Can Cheapflights notify me if prices for flights from O'Hare Intl to London become cheaper?

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Cheapest flights from O'Hare Intl to London
Explore the most affordable flight options available from O'Hare Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.