How long is the flight from Chicago to London Heathrow Airport?

There are many flights that can get you from Chicago to London Heathrow Airport in 8h 05m. Fly via United Airlines, Delta, or Virgin Atlantic to get the fastest option. The distance from Chicago to London Heathrow Airport is about 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 to London Heathrow Airport round-trip?

Lufthansa, at £352, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include American Airlines and Finnair. Lufthansa is priced at 39% lower than the current average price of a flight leaving 3 months from now.

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

One-way options have recently been found by users for as low as £188 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include KLM from £285 and Delta from £285 one-way.

What is the cheapest day to fly from Chicago to London Heathrow Airport?

Travellers seeking maximum savings on their Chicago to London Heathrow Airport flight should consider departing on Thursday afternoons 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 Heathrow Airport 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 Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, 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 cheapest flights from Chicago to London Heathrow Airport?

While on average a flight from Chicago to London Heathrow Airport is generally £393, our data shows the cheapest flight currently is £255. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £310 for that flight.

What are the most reliable airlines from Chicago to London Heathrow Airport?

The top 3 most reliable airlines when flying from Chicago to London Heathrow Airport are Royal Jordanian (71%), American Airlines (68%) and Alaska Airlines (68%).

What are the most popular airlines that fly from Chicago to London Heathrow Airport?

The most popular airlines flying from Chicago to London Heathrow Airport are American Airlines, Finnair and British Airways. Something to consider prior to booking your flight.

Can I find deals for flights from Chicago to Heathrow that include hotel bookings?

Yes. In addition to deals on Chicago to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Chicago to Heathrow?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Heathrow.

Can I find deals for business class flights from Chicago to Heathrow?

Yes. Cheapflights offers flight deals from Chicago to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£174+ Flights from Chicago to London Heathrow Airport

Q: How much does it cost for a return flight from Chicago to London Heathrow Airport?

Airfare is below average for this route at the moment. Chicago to London Heathrow Airport flights typically cost between £462 and £572 in November. The cheapest return flight price found within the last 3 days was £370 on Air Canada (5 Nov-11 Nov).

Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in November or April, booked 68 days in advance, depart on a Thursday or Sunday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Round-trip from	£370
One-way from	£174
Popular in	June
Cheapest in	November
Average price	£501
Good round-trip deal	£438 or less
Good one-way deal	£273 or less

Air Canada
5/11-11/11
3 total stops
27h 59m total
Chicago to London

Search Deals

19/10
2 total stops
30h 28m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 22% potential increase in price (£120 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£22 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 Heathrow.

Search Deals

Price to beat on a one-way flight from Chicago (CHI) to London Heathrow.

Search Deals

Find flight deals from Chicago to Heathrow

Cheapest flights from Chicago to Heathrow
Explore the most affordable flight options available from Chicago to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Mi 5/1112:50ORD - LHR

1 stop12h 20mAir Canada

Di 11/1109:00LHR - ORD

2 stops15h 39mAir Canada

Deal found 15/9£370

Mo 1/1212:50ORD - LHR

1 stop12h 20mMultiple Airlines

Di 9/1209:00LHR - ORD

2 stops15h 52mMultiple Airlines

Deal found 16/9£371

Mi 22/1018:00ORD - LHR

Nonstop8h 20mUnited Airlines

Fr 31/1006:50LHR - ORD

1 stop11h 20mUnited Airlines

Deal found 16/9£371

So 28/910:40ORD - LHR

1 stop13h 50mAir Canada

Di 7/1006:50LHR - ORD

2 stops13h 58mAir Canada

Deal found 16/9£372

Di 23/922:35ORD - LHR

Nonstop7h 40mFinnair

Fr 3/1014:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 16/9£374

Mo 29/916:20ORD - LHR

1 stop16h 00mAustrian Airlines

Di 21/1006:00LHR - ORD

1 stop13h 20mAustrian Airlines

Deal found 16/9£374

Mi 5/1115:50ORD - LHR

1 stop13h 35mDelta

Do 20/1106:20LHR - ORD

1 stop14h 50mDelta

Deal found 17/9£375

So 19/1017:40ORD - LHR

Nonstop7h 40mBritish Airways

Di 4/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 18/9£376

Mi 8/1013:08ORD - LHR

1 stop16h 17mDelta

Mi 11/308:55LHR - ORD

1 stop12h 15mDelta

Deal found 16/9£377

So 19/1019:59ORD - LHR

1 stop11h 31mDelta

Mi 3/1208:55LHR - ORD

1 stop12h 15mDelta

Deal found 17/9£377

Di 30/913:05ORD - LHR

1 stop12h 10mDelta

Mo 13/1011:45LHR - ORD

1 stop32h 25mDelta

Deal found 16/9£378

Mi 8/1013:43ORD - LHR

1 stop10h 37mIberia

Mi 22/1012:15LHR - ORD

Nonstop8h 25mIberia

Deal found 16/9£379

Best flights from Chicago to Heathrow
Discover carefully curated flight deals from Chicago to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 September 2025.

Mo 1/1217:50ORD - LHR

Nonstop8h 05mUnited Airlines

Di 9/1206:50LHR - ORD

1 stop11h 20mUnited Airlines

Deal found 16/9£371

Di 30/913:00ORD - LHR

1 stop11h 25mDelta

Di 7/1006:30LHR - ORD

1 stop13h 40mDelta

Deal found 17/9£378

Mi 25/221:45ORD - LHR

Nonstop7h 50mBritish Airways

Fr 6/311:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 16/9£380

Di 3/318:30ORD - LHR

1 stop19h 00mIcelandair

Mo 9/312:15LHR - ORD

1 stop11h 05mIcelandair

Deal found 16/9£383

Mi 29/1010:40MDW - LHR

2 stops15h 10mVirgin Atlantic

Mi 5/1106:30LHR - MDW

2 stops15h 45mVirgin Atlantic

Deal found 17/9£388

So 28/920:10ORD - LHR

1 stop11h 00mDelta

Di 21/1008:40LHR - ORD

1 stop11h 30mDelta

Deal found 16/9£378

Mi 10/1215:45ORD - LHR

Nonstop8h 10mUnited Airlines

Fr 19/1207:40LHR - ORD

Nonstop9h 20mUnited Airlines

Deal found 16/9£380

So 28/912:43MDW - LHR

1 stop18h 47mVirgin Atlantic

Di 7/1011:45LHR - MDW

1 stop12h 40mVirgin Atlantic

Deal found 16/9£390

Di 7/1016:00ORD - LHR

Nonstop8h 20mUnited Airlines

Di 14/1011:05LHR - ORD

Nonstop9h 05mUnited Airlines

Deal found 17/9£380

Mo 1/1213:47MDW - LHR

1 stop11h 18mDelta

Di 9/1206:30LHR - MDW

2 stops17h 30mDelta

Deal found 17/9£385

Mi 22/1017:04MDW - LHR

1 stop14h 26mVirgin Atlantic

Mi 29/1010:45LHR - MDW

1 stop16h 29mVirgin Atlantic

Deal found 16/9£390

Mi 15/1015:35ORD - LHR

1 stop12h 00mUnited Airlines

Mi 29/1007:40LHR - ORD

Nonstop9h 20mUnited Airlines

Deal found 16/9£380

So 2/1109:20MDW - LHR

1 stop15h 45mDelta

Do 20/1108:40LHR - MDW

2 stops15h 38mDelta

Deal found 17/9£385

Mi 25/213:00MDW - LHR

2 stops11h 55mVirgin Atlantic

Di 3/306:20LHR - MDW

2 stops18h 14mVirgin Atlantic

Deal found 16/9£393

So 28/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Mi 15/1008:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 16/9£380

Mo 29/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Di 7/1014:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 16/9£380

Di 2/1209:34MDW - LHR

1 stop17h 11mDelta

So 7/1206:20LHR - MDW

2 stops17h 40mDelta

Deal found 16/9£421

Mo 29/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Mi 15/1009:30LHR - ORD

1 stop11h 18mUnited Airlines

Deal found 16/9£380

Mo 6/1012:48MDW - LHR

1 stop11h 57mDelta

Mo 13/1008:40LHR - MDW

2 stops15h 45mDelta

Deal found 17/9£422

So 28/918:00ORD - LHR

Nonstop8h 20mUnited Airlines

Do 16/1008:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 16/9£380

Do 16/1009:35MDW - LHR

1 stop17h 20mDelta

Do 23/1008:40LHR - MDW

2 stops15h 45mDelta

Deal found 17/9£422

Fr 16/109:30MDW - LHR

1 stop17h 15mDelta

Di 20/106:20LHR - MDW

2 stops18h 14mDelta

Deal found 17/9£426

Direct flights from Chicago to Heathrow
Explore direct flight options from Chicago to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 18 September 2025.

So 28/918:00ORD - LHR

Nonstop8h 20mAir Canada

Di 7/1014:10LHR - ORD

Nonstop9h 10mAir Canada

Deal found 16/9£371

Mo 6/1021:15ORD - LHR

Nonstop7h 50mBritish Airways

Di 14/1009:15LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 15/9£375

So 19/1017:40ORD - LHR

Nonstop7h 40mBritish Airways

Di 4/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 18/9£376

So 9/1120:40ORD - LHR

Nonstop7h 45mIberia

Di 18/1111:00LHR - ORD

Nonstop8h 50mIberia

Deal found 17/9£377

So 28/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Di 7/1014:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 17/9£378

Mo 6/1020:40ORD - LHR

Nonstop7h 50mIberia

Mi 22/1012:15LHR - ORD

Nonstop8h 25mIberia

Deal found 16/9£379

Mi 22/1016:55ORD - LHR

Nonstop7h 55mBritish Airways

Fr 5/1211:00LHR - ORD

Nonstop8h 50mBritish Airways

Deal found 17/9£380

Mi 22/1018:00ORD - LHR

Nonstop8h 20mUnited Airlines

Mi 29/1013:35LHR - ORD

Nonstop9h 25mUnited Airlines

Deal found 18/9£380

So 1/321:45ORD - LHR

Nonstop7h 50mBritish Airways

Mi 6/512:15LHR - ORD

Nonstop8h 25mBritish Airways

Deal found 16/9£388

Di 30/922:35ORD - LHR

Nonstop7h 40mBritish Airways

Mi 8/1011:05LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 16/9£396

Last-minute flights from Chicago to Heathrow
Discover last-minute flight deals from Chicago to Heathrow. Data last updated 18 September 2025 and is based on user searches.

Di 23/922:35ORD - LHR

Nonstop7h 40mFinnair

Fr 3/1014:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 16/9£374

Mi 24/913:59ORD - LHR

1 stop10h 21mIberia

Do 2/1012:15LHR - ORD

Nonstop8h 35mIberia

Deal found 17/9£379

Fr 26/919:05ORD - LHR

1 stop15h 20mUnited Airlines

So 28/912:15LHR - ORD

1 stop14h 00mUnited Airlines

Deal found 17/9£382

So 28/921:25ORD - LHR

Nonstop8h 20mUnited Airlines

Di 21/1006:50LHR - ORD

1 stop11h 15mUnited Airlines

Deal found 16/9£371

So 28/910:40ORD - LHR

1 stop13h 50mAir Canada

Di 7/1006:50LHR - ORD

2 stops13h 58mAir Canada

Deal found 16/9£372

So 28/914:05ORD - LHR

1 stop10h 40mDelta

Di 7/1008:40LHR - ORD

1 stop11h 30mDelta

Deal found 17/9£375

So 28/920:40ORD - LHR

Nonstop7h 50mIberia

Di 7/1009:45LHR - ORD

1 stop12h 28mIberia

Deal found 16/9£376

So 28/920:10ORD - LHR

1 stop11h 00mDelta

Mi 15/1006:15LHR - ORD

1 stop14h 45mDelta

Deal found 16/9£377

So 28/907:20ORD - LHR

1 stop17h 55mDelta

Di 21/1008:40LHR - ORD

1 stop11h 30mDelta

Deal found 17/9£378

So 28/918:00ORD - LHR

Nonstop8h 20mUnited Airlines

Mi 15/1009:30LHR - ORD

1 stop11h 18mUnited Airlines

Deal found 16/9£380

So 28/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Di 7/1014:10LHR - ORD

Nonstop9h 10mUnited Airlines

Deal found 16/9£380

So 28/918:30MDW - LHR

1 stop13h 00mDelta

Di 7/1008:40LHR - MDW

2 stops15h 45mDelta

Deal found 16/9£385

One-way flights from Chicago to Heathrow
Search for one-way flight options from Chicago to Heathrow. Find affordable one-way fares based on user searches. Data last updated 18 September 2025.

So 19/1010:27ORD - LHR

2 stops30h 28mMultiple Airlines

Deal found 16/9£174

Do 25/916:56MDW - LHR

3 stops41h 44mMultiple Airlines

Deal found 16/9£175

Fr 26/917:15MDW - LHR

3 stops32h 25mMultiple Airlines

Deal found 16/9£176

Sa 6/1206:40ORD - LHR

2 stops19h 05mMultiple Airlines

Deal found 16/9£178

Do 20/1106:20MDW - LHR

2 stops29h 10mMultiple Airlines

Deal found 16/9£179

Mi 15/1006:40ORD - LHR

2 stops26h 55mMultiple Airlines

Deal found 16/9£180

Di 18/1106:40ORD - LHR

2 stops28h 50mMultiple Airlines

Deal found 16/9£181

So 9/1113:35ORD - LHR

2 stops21h 55mMultiple Airlines

Deal found 16/9£182

Mo 20/1010:27ORD - LHR

2 stops17h 53mMultiple Airlines

Deal found 16/9£184

Mi 29/1016:03ORD - LHR

2 stops20h 27mMultiple Airlines

Deal found 17/9£185

Mo 13/1016:24MDW - LHR

2 stops35h 56mMultiple Airlines

Deal found 17/9£185

Di 11/1106:40ORD - LHR

2 stops32h 55mMultiple Airlines

Deal found 17/9£186

Cheapflights Fare Finder

Use the filters below to find and compare flights from Chicago to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mo 1/12

17:50-07:55

Nonstop8h 05m

London Heathrow

Di 9/12

06:50-12:10

1 stop11h 20m

£371

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Di 30/9

13:00-06:25

1 stop11h 25m

London Heathrow

Di 7/10

06:30-14:10

1 stop13h 40m

£378

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

So 28/9

20:10-13:10

1 stop11h 00m

London Heathrow

Di 21/10

08:40-14:10

1 stop11h 30m

£378

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mi 25/2

21:45-11:35

Nonstop7h 50m

London Heathrow

Fr 6/3

11:00-13:50

Nonstop8h 50m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mi 10/12

15:45-05:55

Nonstop8h 10m

London Heathrow

Fr 19/12

07:40-11:00

Nonstop9h 20m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Di 7/10

16:00-06:20

Nonstop8h 20m

London Heathrow

Di 14/10

11:05-14:10

Nonstop9h 05m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mi 15/10

15:35-09:35

1 stop12h 00m

London Heathrow

Mi 29/10

07:40-12:00

Nonstop9h 20m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

So 28/9

21:25-11:45

Nonstop8h 20m

London Heathrow

Mi 15/10

08:30-11:30

Nonstop9h 00m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mo 29/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Di 7/10

14:10-17:20

Nonstop9h 10m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mo 29/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Mi 15/10

09:30-14:48

1 stop11h 18m

£380

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 43 results

...

Best time to book a flight from Chicago to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 Heathrow Airport

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

Booking 68 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £112). Flying from Chicago to London Heathrow Airport 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 LHR?

It’s typically best to fly out from Chicago to London Heathrow Airport in the morning. Doing so could potentially save you 16% on the flight price compared to flying at midday, which is usually more expensive.

Weekly flight availability from Chicago to London Heathrow Airport

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

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

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

Reykjavik (KEF) – chosen by Cheapflights users on 33% of one-stop itineraries from Chicago to London Heathrow Airport on Cheapflights.

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

Copenhagen (CPH) is the most affordable one-stop option, with an average return flight price of £372.

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

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

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

Flights via Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 28m.

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Iberia and British Airways from Chicago to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Iberia

7.0

Good

2,925 reviews

Check prices

Reviews

1 / 20

6.0

Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight

Iberia

7.0

Good

2,925 reviews

Iberia

7.0

Good

2,925 reviews

Check prices

Reviews

1 / 20

6.0

Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight

British Airways

6.7

Okay

7,367 reviews

Iberia

7.0

Good

2,925 reviews

Check prices

Reviews

1 / 20

6.0

Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight

Related info for your journey

How long is the flight from Chicago to London Heathrow Airport?
There are many flights that can get you from Chicago to London Heathrow Airport in 8h 05m. Fly via United Airlines, Delta, or Virgin Atlantic to get the fastest option. The distance from Chicago to London Heathrow Airport is about 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 to London Heathrow Airport round-trip?
Lufthansa, at £352, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include American Airlines and Finnair. Lufthansa is priced at 39% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Chicago to London Heathrow Airport one-way?
One-way options have recently been found by users for as low as £188 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include KLM from £285 and Delta from £285 one-way.
What are the most reliable airlines from Chicago to London Heathrow Airport?
The top 3 most reliable airlines when flying from Chicago to London Heathrow Airport are Royal Jordanian (71%), American Airlines (68%) and Alaska Airlines (68%).
What are the cheapest flights from Chicago to London Heathrow Airport?
While on average a flight from Chicago to London Heathrow Airport is generally £393, our data shows the cheapest flight currently is £255. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £310 for that flight.
Can I find deals for flights from Chicago to Heathrow that include hotel bookings?
Yes. In addition to deals on Chicago to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Chicago to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Heathrow.
Can I find deals for business class flights from Chicago to Heathrow?
Yes. Cheapflights offers flight deals from Chicago to Heathrow 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 Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £112). Flying from Chicago to London Heathrow Airport 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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Top 7 airlines flying from Chicago to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£352	Average£541	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£379	Average£619	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Finnair	Cheapest£407	Average£640	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£439	Average£530	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Aer Lingus	Cheapest£442	Average£570	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£684	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Chicago today with Cheapflights!

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Chicago to Heathrow for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to Heathrow from Chicago shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes! Start tracking prices for Chicago to Heathrow 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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Cheap flights from Chicago to London Heathrow Airport from £174

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 19/10. 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 Heathrow are usually found in November or April, booked 68 days in advance, depart on a Thursday or Sunday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

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Find flight deals from Chicago to Heathrow

Cheapest flights from Chicago to HeathrowExplore the most affordable flight options available from Chicago to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Explore the most affordable flight options available from Chicago to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

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Use the filters below to find and compare flights from Chicago to London Heathrow Airport that are best for you.

Best time to book a flight from Chicago to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Chicago with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Chicago to London Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from Chicago to Heathrow. Price data was last updated on 12 September 2025.

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

What is the cheapest time of day to fly from CHI to LHR?

Find hourly flight availability from Chicago to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 September 2025.

Weekly flight availability from Chicago to London Heathrow Airport

Explore weekly flight availability from Chicago to Heathrow. 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 18 September 2025.

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

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

Share of one-stop return flights from Chicago to London Heathrow Airport 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 Heathrow Airport?

Average return fare for one-stop flights from Chicago to London Heathrow Airport, 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 Heathrow Airport?

Shortest average travel time for one-stop one-way flights from Chicago to London Heathrow Airport, 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 Heathrow Airport?

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

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Iberia and British Airways from Chicago to London Heathrow Airport 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 Chicago to Heathrow. 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 Heathrow Airport?

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

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

What are the most reliable airlines from Chicago to London Heathrow Airport?

What are the cheapest flights from Chicago to London Heathrow Airport?

Can I find deals for flights from Chicago to Heathrow that include hotel bookings?

How can I find direct flights from Chicago to Heathrow?

Can I find deals for business class flights from Chicago to Heathrow?

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

Travelling to a place near London Heathrow Airport?

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Alternative routes for Chicago to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from Chicago to Heathrow

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Cheapest flights from Chicago to Heathrow
Explore the most affordable flight options available from Chicago to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.