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

Icelandair, at £432, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include Scandinavian Airlines and Iberia. Icelandair is priced at 26% 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 £198 on Icelandair. Other airlines that offer cheap prices include TAP AIR PORTUGAL from £207 and JetBlue from £260 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 Wednesday 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.

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

While on average a flight from Chicago to London Heathrow Airport is generally £3,079, our data shows the cheapest flight currently is £290. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £392 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 (88%), Gulf Air (82%) and Malaysia Airlines (79%).

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.

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

Saturday flights are found to be more expensive to fly from Chicago to London Heathrow Airport. 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 Heathrow Airport.

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

Find a great deal and save up to 7% by booking at least 60 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Chicago to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at £534.

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

February can be a great time to fly to London Heathrow Airport from Chicago with a flight ticket averaging about £564. Cheapflights users have found deals in the month of February for as cheap as £357. The most expensive prices can be found in the month of June.

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.

£198+ Flights from Chicago to London Heathrow Airport

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 Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Round-trip from	£432
One-way from	£198
Popular in	June
Cheapest in	November
Average price	£504
Good round-trip deal	£512 or less
Good one-way deal	£309 or less

Icelandair
5/8-19/8
2 total stops
40h 20m total
Chicago to London

Search Deals

Icelandair
19/7
1 total stop
10h 30m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 17% potential increase in price (£93 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 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 17 April 2025.

Tue 5/819:25ORD - LHR

1 stop10h 30mIcelandair

Tue 19/821:25LHR - ORD

1 stop29h 50mIcelandair

Deal found 16/4£432

Tue 23/919:15ORD - LHR

1 stop14h 45mScandinavian Airlines

Tue 30/910:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 16/4£453

Tue 19/817:45ORD - LHR

Nonstop7h 35mIberia

Thu 28/814:25LHR - ORD

Nonstop8h 35mIberia

Deal found 15/4£453

Wed 24/914:08ORD - LHR

1 stop10h 22mMultiple Airlines

Wed 8/1006:00LHR - ORD

1 stop12h 10mMultiple Airlines

Deal found 15/4£457

Tue 19/816:55ORD - LHR

Nonstop7h 55mBritish Airways

Mon 25/815:30LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 17/4£460

Tue 13/519:05ORD - LHR

1 stop11h 55mSWISS

Tue 20/508:45LHR - ORD

1 stop13h 10mSWISS

Deal found 16/4£461

Tue 6/515:45ORD - LHR

1 stop10h 15mAer Lingus

Tue 13/507:40LHR - ORD

1 stop12h 20mAer Lingus

Deal found 16/4£466

Tue 22/415:35ORD - LHR

1 stop12h 25mAir Canada

Wed 30/414:05LHR - ORD

1 stop11h 55mAir Canada

Deal found 15/4£467

Tue 29/410:25ORD - LHR

1 stop15h 40mDelta

Tue 9/906:30LHR - ORD

1 stop13h 40mDelta

Deal found 16/4£469

Mon 22/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 10/1011:05LHR - ORD

Nonstop9h 05mUnited Airlines

Deal found 15/4£471

Tue 26/813:05MDW - LHR

1 stop11h 40mVirgin Atlantic

Tue 9/906:15LHR - MDW

2 stops18h 21mVirgin Atlantic

Deal found 16/4£476

Sun 3/818:45MDW - LHR

1 stop12h 25mDelta

Thu 21/806:30LHR - MDW

2 stops17h 33mDelta

Deal found 16/4£477

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 17 April 2025.

Tue 5/819:25ORD - LHR

1 stop10h 30mIcelandair

Tue 19/821:25LHR - ORD

1 stop29h 50mIcelandair

Deal found 16/4£432

Tue 23/919:15ORD - LHR

1 stop14h 45mScandinavian Airlines

Tue 30/910:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 16/4£453

Tue 19/817:45ORD - LHR

Nonstop7h 35mIberia

Thu 28/814:25LHR - ORD

Nonstop8h 35mIberia

Deal found 15/4£453

Wed 24/914:08ORD - LHR

1 stop10h 22mMultiple Airlines

Wed 8/1006:00LHR - ORD

1 stop12h 10mMultiple Airlines

Deal found 15/4£457

Tue 19/816:55ORD - LHR

Nonstop7h 55mBritish Airways

Mon 25/815:30LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 17/4£460

Tue 13/519:05ORD - LHR

1 stop11h 55mSWISS

Tue 20/508:45LHR - ORD

1 stop13h 10mSWISS

Deal found 16/4£461

Tue 6/515:45ORD - LHR

1 stop10h 15mAer Lingus

Tue 13/507:40LHR - ORD

1 stop12h 20mAer Lingus

Deal found 16/4£466

Tue 6/517:05ORD - LHR

1 stop9h 50mKLM

Thu 15/506:30LHR - ORD

1 stop13h 40mKLM

Deal found 15/4£467

Tue 29/410:25ORD - LHR

1 stop15h 40mDelta

Tue 9/906:30LHR - ORD

1 stop13h 40mDelta

Deal found 16/4£469

Mon 22/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 10/1014:10LHR - ORD

1 stop30h 45mUnited Airlines

Deal found 15/4£471

Tue 6/510:40ORD - LHR

1 stop13h 50mAir Canada

Tue 13/514:05LHR - ORD

1 stop12h 07mAir Canada

Deal found 16/4£481

Tue 22/409:52MDW - LHR

1 stop14h 53mVirgin Atlantic

Tue 29/413:05LHR - MDW

1 stop15h 17mVirgin Atlantic

Deal found 15/4£482

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 17 April 2025.

Tue 19/817:45ORD - LHR

Nonstop7h 35mIberia

Thu 28/814:25LHR - ORD

Nonstop8h 35mIberia

Deal found 15/4£453

Tue 19/816:55ORD - LHR

Nonstop7h 55mBritish Airways

Mon 25/815:30LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 17/4£460

Sun 4/520:20ORD - LHR

Nonstop8h 10mAmerican Airlines

Fri 16/514:25LHR - ORD

Nonstop8h 35mAmerican Airlines

Deal found 16/4£471

Tue 13/516:05ORD - LHR

Nonstop8h 15mLufthansa

Wed 21/511:05LHR - ORD

Nonstop9h 05mLufthansa

Deal found 16/4£490

Wed 1/1021:25ORD - LHR

Nonstop8h 20mUnited Airlines

Thu 9/1011:05LHR - ORD

Nonstop9h 05mUnited Airlines

Deal found 15/4£491

Tue 6/522:25ORD - LHR

Nonstop7h 50mFinnair

Tue 13/511:05LHR - ORD

Nonstop8h 45mFinnair

Deal found 16/4£500

Sun 4/518:05ORD - LHR

Nonstop8h 15mBrussels Airlines

Tue 13/511:05LHR - ORD

Nonstop9h 05mBrussels Airlines

Deal found 16/4£511

Wed 24/917:45ORD - LHR

Nonstop7h 35mMultiple Airlines

Wed 1/1014:25LHR - ORD

Nonstop8h 35mMultiple Airlines

Deal found 16/4£640

Tue 6/521:20ORD - LHR

Nonstop8h 25mAustrian Airlines

Wed 14/511:05LHR - ORD

Nonstop9h 05mAustrian Airlines

Deal found 16/4£659

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

Tue 22/409:40ORD - LHR

2 stops18h 20mMultiple Airlines

Tue 29/408:45LHR - ORD

1 stop13h 10mMultiple Airlines

Deal found 15/4£455

Tue 22/415:35ORD - LHR

1 stop12h 25mAir Canada

Tue 29/414:05LHR - ORD

1 stop11h 55mAir Canada

Deal found 16/4£463

Tue 22/415:30ORD - LHR

1 stop16h 00mDelta

Wed 30/409:00LHR - ORD

1 stop12h 00mDelta

Deal found 16/4£469

Tue 22/409:52MDW - LHR

1 stop14h 53mVirgin Atlantic

Tue 29/413:05LHR - MDW

1 stop15h 17mVirgin Atlantic

Deal found 15/4£482

Tue 22/412:07ORD - LHR

1 stop13h 33mBritish Airways

Tue 29/412:15LHR - ORD

Nonstop8h 30mBritish Airways

Deal found 16/4£491

Tue 22/415:35ORD - LHR

1 stop12h 25mUnited Airlines

Tue 29/412:10LHR - ORD

1 stop33h 45mUnited Airlines

Deal found 16/4£500

Tue 22/422:20ORD - LHR

Nonstop7h 55mFinnair

Wed 30/409:15LHR - ORD

Nonstop8h 30mFinnair

Deal found 16/4£506

Tue 22/415:35ORD - LHR

1 stop12h 25mAir Canada

Wed 30/414:05LHR - ORD

1 stop11h 55mAir Canada

Deal found 15/4£467

Sat 26/413:26ORD - LHR

1 stop14h 04mJetBlue

Thu 1/511:55LHR - ORD

1 stop30h 18mJetBlue

Deal found 16/4£483

Sun 27/418:35ORD - LHR

1 stop15h 50mSWISS

Mon 5/518:40LHR - ORD

1 stop23h 30mSWISS

Deal found 16/4£461

Sun 27/417:43ORD - LHR

1 stop11h 27mAir France

Tue 6/509:00LHR - ORD

1 stop12h 00mAir France

Deal found 15/4£468

Sun 27/422:15ORD - LHR

1 stop16h 05mIcelandair

Thu 1/521:25LHR - ORD

1 stop29h 50mIcelandair

Deal found 16/4£478

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 17 April 2025.

Sat 19/719:25ORD - LHR

1 stop10h 30mIcelandair

Deal found 16/4£198

Mon 4/818:10ORD - LHR

1 stop17h 35mTAP AIR PORTUGAL

Deal found 16/4£207

Tue 13/505:51ORD - LHR

2 stops32h 29mMultiple Airlines

Deal found 16/4£214

Thu 2/1013:35ORD - LHR

1 stop13h 55mJetBlue

Deal found 16/4£260

Tue 13/509:34MDW - LHR

3 stops28h 46mMultiple Airlines

Deal found 16/4£266

Sun 14/919:15ORD - LHR

2 stops20h 20mScandinavian Airlines

Deal found 16/4£279

Wed 23/422:20ORD - LHR

Nonstop7h 55mIberia

Deal found 15/4£286

Tue 29/421:30ORD - LHR

1 stop18h 40mFinnair

Deal found 16/4£287

Mon 12/515:45ORD - LHR

1 stop10h 15mAer Lingus

Deal found 16/4£290

Mon 13/1016:00ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 15/4£298

Sun 11/509:16MDW - LHR

2 stops15h 29mVirgin Atlantic

Deal found 15/4£302

Wed 23/409:40ORD - LHR

2 stops16h 55mAir Canada

Deal found 15/4£303

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

Tue 5/8

19:25-11:55

1 stop10h 30m

London Heathrow

Tue 19/8

21:25-21:15

1 stop29h 50m

£432

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 23/9

19:15-16:00

1 stop14h 45m

London Heathrow

Tue 30/9

10:20-16:10

1 stop11h 50m

£453

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 19/8

17:45-07:20

Nonstop7h 35m

London Heathrow

Thu 28/8

14:25-17:00

Nonstop8h 35m

£453

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 24/9

14:08-06:30

1 stop10h 22m

London Heathrow

Wed 8/10

06:00-12:10

1 stop12h 10m

£457

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 19/8

16:55-06:50

Nonstop7h 55m

London Heathrow

Mon 25/8

15:30-18:15

Nonstop8h 45m

£460

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 13/5

19:05-13:00

1 stop11h 55m

London Heathrow

Tue 20/5

08:45-15:55

1 stop13h 10m

£461

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 6/5

15:45-08:00

1 stop10h 15m

London Heathrow

Tue 13/5

07:40-14:00

1 stop12h 20m

£466

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 6/5

17:05-08:55

1 stop9h 50m

London Heathrow

Thu 15/5

06:30-14:10

1 stop13h 40m

£467

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 29/4

10:25-08:05

1 stop15h 40m

London Heathrow

Tue 9/9

06:30-14:10

1 stop13h 40m

£469

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 22/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Fri 10/10

14:10-14:55

1 stop30h 45m

£471

Flights are sorted by cheapest return flights first.

Deals found on 16/4

Showing 1-10 of 41 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 at midday. Doing so could potentially save you 9% on the flight price compared to flying in the evening, 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 Thursday, which is when the least amount of flights are scheduled (48 on average).

Rainfall in Heathrow by month

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.

Temperature in Heathrow by month

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).

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM and Finnair from Chicago 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.

Delta

8.0

Very Good

7,916 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

7,916 reviews

Delta

8.0

Very Good

7,916 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,327 reviews

Delta

8.0

Very Good

7,916 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,269 reviews

Delta

8.0

Very Good

7,916 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air France

7.5

Good

1,435 reviews

Delta

8.0

Very Good

7,916 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS

7.5

Good

1,580 reviews

Delta

8.0

Very Good

7,916 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What are the cheapest airlines flying from Chicago to London Heathrow Airport round-trip?
Icelandair, at £432, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include Scandinavian Airlines and Iberia. Icelandair is priced at 26% 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 £198 on Icelandair. Other airlines that offer cheap prices include TAP AIR PORTUGAL from £207 and JetBlue from £260 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 (88%), Gulf Air (82%) and Malaysia Airlines (79%).
What are the cheapest flights from Chicago to London Heathrow Airport?
While on average a flight from Chicago to London Heathrow Airport is generally £3,079, our data shows the cheapest flight currently is £290. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £392 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

Hounslow

Deal

Milton Keynes

Gatwick

Luton

Slough

Croydon

Eastbourne

Wembley

Northampton

Hayes

Crawley

Southend-on-Sea

Maidstone

Swindon

Ipswich

Southall

Ilford

Winchester

Folkestone

Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from Chicago to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Finnair	Cheapest£360	Average£699	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
American Airlines	Cheapest£387	Average£771	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Iberia	Cheapest£452	Average£612	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£482	Average£634	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£491	Average£1,022	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£502	Average£711	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 £198

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 19/7. 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 Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 17 April 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 17 April 2025.

Cheapflights Fare Finder

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 11 April 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 17 April 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 17 April 2025.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM and Finnair from Chicago 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 Chicago to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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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?

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Alternative routes for Chicago to Heathrow

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Top 6 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 17 April 2025.