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

Icelandair, at £457, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include Scandinavian Airlines and Virgin Atlantic. Icelandair is priced at 24% 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 £206 on Icelandair. Other airlines that offer cheap prices include JetBlue from £209 and TAP AIR PORTUGAL from £210 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 £3,170, our data shows the cheapest flight currently is £286. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £349 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 (87%), Air Canada (80%) and Austrian Airlines (80%).

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 49 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 £547.

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 £584. Cheapflights users have found deals in the month of February for as cheap as £366. 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.

£206+ Flights from Chicago to London Heathrow Airport

Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in January or February, booked 68 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Round-trip from	£457
One-way from	£206
Popular in	June
Cheapest in	January
Average price	£568
Good round-trip deal	£531 or less
Good one-way deal	£316 or less

Icelandair
25/4-2/5
2 total stops
42h 55m total
Chicago to London

Search Deals

Icelandair
1/4
1 total stop
10h 25m total
Chicago to London

Search Deals

Highest demand for flights based on searches. 18% potential increase in price (£108 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£18 potential savings vs. average return price).

Search Deals

Average for round-trip flights in March 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 27 March 2025.

Fri 25/422:15ORD - LHR

1 stop16h 05mIcelandair

Fri 2/521:25LHR - ORD

1 stop26h 50mIcelandair

Deal found 27/3£457

Sat 23/819:15ORD - LHR

1 stop16h 25mScandinavian Airlines

Mon 1/910:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 27/3£458

Tue 22/407:20ORD - LHR

1 stop17h 10mAir Canada

Sun 27/414:05LHR - ORD

1 stop11h 55mAir Canada

Deal found 25/3£479

Mon 21/415:45ORD - LHR

1 stop10h 15mAer Lingus

Tue 29/413:25LHR - ORD

1 stop11h 35mAer Lingus

Deal found 26/3£482

Mon 21/409:20MDW - LHR

1 stop17h 35mVirgin Atlantic

Tue 29/411:45LHR - MDW

1 stop12h 35mVirgin Atlantic

Deal found 26/3£487

Wed 30/407:20ORD - LHR

2 stops19h 15mMultiple Airlines

Fri 9/506:00LHR - ORD

1 stop12h 10mMultiple Airlines

Deal found 26/3£489

Mon 21/422:20ORD - LHR

Nonstop7h 55mFinnair

Tue 29/410:20LHR - ORD

1 stop13h 30mFinnair

Deal found 27/3£491

Thu 1/508:50ORD - LHR

1 stop15h 40mJetBlue

Tue 6/508:15LHR - ORD

1 stop12h 49mJetBlue

Deal found 26/3£497

Thu 25/917:45ORD - LHR

Nonstop7h 35mIberia

Tue 7/1009:15LHR - ORD

Nonstop8h 35mIberia

Deal found 25/3£500

Mon 22/917:45ORD - LHR

Nonstop7h 35mBritish Airways

Tue 30/911:05LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 27/3£502

Mon 7/418:35ORD - LHR

1 stop15h 50mSWISS

Wed 23/408:40LHR - ORD

1 stop13h 15mSWISS

Deal found 26/3£503

Tue 22/411:30ORD - LHR

1 stop16h 30mUnited Airlines

Tue 29/408:45LHR - ORD

1 stop13h 10mUnited Airlines

Deal found 26/3£508

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 27 March 2025.

Fri 25/422:15ORD - LHR

1 stop16h 05mIcelandair

Fri 2/521:25LHR - ORD

1 stop26h 50mIcelandair

Deal found 27/3£457

Thu 1/519:15ORD - LHR

2 stops17h 35mScandinavian Airlines

Thu 15/510:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 27/3£458

Mon 21/413:25ORD - LHR

1 stop13h 30mVirgin Atlantic

Tue 29/406:30LHR - ORD

1 stop13h 40mVirgin Atlantic

Deal found 26/3£472

Tue 22/407:20ORD - LHR

1 stop17h 10mAir Canada

Sun 27/414:05LHR - ORD

1 stop11h 55mAir Canada

Deal found 25/3£479

Mon 21/415:45ORD - LHR

1 stop10h 15mAer Lingus

Tue 29/413:25LHR - ORD

1 stop11h 35mAer Lingus

Deal found 26/3£482

Wed 30/407:20ORD - LHR

2 stops19h 15mMultiple Airlines

Fri 9/506:00LHR - ORD

1 stop12h 10mMultiple Airlines

Deal found 26/3£489

Mon 21/422:20ORD - LHR

Nonstop7h 55mFinnair

Tue 29/410:20LHR - ORD

1 stop13h 30mFinnair

Deal found 27/3£491

Thu 1/508:50ORD - LHR

1 stop15h 40mJetBlue

Tue 6/508:15LHR - ORD

1 stop19h 39mJetBlue

Deal found 26/3£497

Tue 23/913:06ORD - LHR

1 stop11h 14mIberia

Thu 2/1014:25LHR - ORD

Nonstop8h 35mIberia

Deal found 25/3£501

Mon 22/919:15ORD - LHR

Nonstop7h 55mBritish Airways

Tue 21/1015:30LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 27/3£502

Mon 7/418:35ORD - LHR

1 stop15h 50mSWISS

Wed 23/408:40LHR - ORD

1 stop13h 15mSWISS

Deal found 26/3£503

Tue 22/418:05ORD - LHR

Nonstop8h 15mUnited Airlines

Fri 2/508:40LHR - ORD

1 stop13h 15mUnited Airlines

Deal found 26/3£508

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 27 March 2025.

Thu 1/522:20ORD - LHR

Nonstop7h 55mBritish Airways

Thu 8/512:15LHR - ORD

Nonstop8h 25mBritish Airways

Deal found 26/3£497

Sun 4/517:45ORD - LHR

Nonstop7h 35mIberia

Fri 16/512:15LHR - ORD

Nonstop8h 25mIberia

Deal found 27/3£506

Mon 21/422:20ORD - LHR

Nonstop7h 55mFinnair

Tue 29/411:05LHR - ORD

Nonstop8h 45mFinnair

Deal found 26/3£514

Sun 21/916:00ORD - LHR

Nonstop8h 20mUnited Airlines

Fri 3/1008:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 25/3£522

Tue 29/417:45ORD - LHR

Nonstop7h 35mMultiple Airlines

Thu 8/514:25LHR - ORD

Nonstop8h 35mMultiple Airlines

Deal found 27/3£672

Mon 21/416:05ORD - LHR

Nonstop8h 15mBrussels Airlines

Tue 29/408:30LHR - ORD

Nonstop9h 05mBrussels Airlines

Deal found 26/3£677

Sun 20/418:05ORD - LHR

Nonstop8h 15mAustrian Airlines

Tue 6/514:10LHR - ORD

Nonstop9h 05mAustrian Airlines

Deal found 27/3£677

Tue 29/417:45ORD - LHR

Nonstop7h 35mAlaska Airlines

Tue 6/514:25LHR - ORD

Nonstop8h 35mAlaska Airlines

Deal found 27/3£697

Last-minute flights from Chicago to Heathrow
Discover last-minute flight deals from Chicago to Heathrow. Data last updated 27 March 2025 and is based on user searches.

Tue 1/419:30ORD - LHR

1 stop10h 25mIcelandair

Tue 29/421:25LHR - ORD

1 stop29h 50mIcelandair

Deal found 26/3£477

Tue 1/417:50ORD - LHR

Nonstop7h 30mFinnair

Tue 29/409:30LHR - ORD

1 stop14h 20mFinnair

Deal found 26/3£493

Tue 1/421:15ORD - LHR

1 stop10h 10mAer Lingus

Tue 15/408:50LHR - ORD

1 stop11h 10mAer Lingus

Deal found 26/3£494

Tue 1/411:30ORD - LHR

1 stop13h 00mMultiple Airlines

Tue 8/406:00LHR - ORD

1 stop15h 55mMultiple Airlines

Deal found 25/3£500

Tue 1/413:56ORD - LHR

2 stops13h 39mAir Canada

Tue 8/408:45LHR - ORD

2 stops15h 37mAir Canada

Deal found 27/3£514

Tue 1/412:51MDW - LHR

1 stop11h 54mDelta

Tue 8/408:40LHR - MDW

2 stops15h 22mDelta

Deal found 25/3£524

Tue 1/412:51MDW - LHR

1 stop11h 54mKLM

Tue 15/409:20LHR - MDW

1 stop12h 52mKLM

Deal found 26/3£530

Tue 1/412:51MDW - LHR

2 stops14h 04mVirgin Atlantic

Tue 8/415:15LHR - MDW

1 stop13h 11mVirgin Atlantic

Deal found 25/3£539

Wed 2/416:05ORD - LHR

Nonstop8h 15mUnited Airlines

Mon 7/412:10LHR - ORD

1 stop30h 00mUnited Airlines

Deal found 26/3£510

Fri 4/413:24ORD - LHR

1 stop14h 06mJetBlue

Wed 9/408:25LHR - ORD

1 stop17h 02mJetBlue

Deal found 26/3£497

Sat 5/417:10ORD - LHR

1 stop20h 35mBritish Airways

Fri 18/414:25LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 26/3£527

Sun 6/414:20ORD - LHR

1 stop11h 35mSWISS

Mon 21/420:05LHR - ORD

1 stop22h 05mSWISS

Deal found 26/3£519

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 27 March 2025.

Tue 1/419:30ORD - LHR

1 stop10h 25mIcelandair

Deal found 27/3£206

Mon 7/410:42ORD - LHR

1 stop13h 48mJetBlue

Deal found 26/3£209

Fri 15/818:00ORD - LHR

1 stop34h 20mTAP AIR PORTUGAL

Deal found 27/3£210

Tue 29/405:55ORD - LHR

2 stops26h 20mMultiple Airlines

Deal found 26/3£215

Tue 27/509:40MDW - LHR

2 stops30h 55mMultiple Airlines

Deal found 26/3£277

Mon 5/519:15ORD - LHR

1 stop20h 25mScandinavian Airlines

Deal found 26/3£286

Mon 28/421:30ORD - LHR

1 stop18h 40mFinnair

Deal found 27/3£300

Sun 6/421:15ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 26/3£311

Tue 1/418:05ORD - LHR

Nonstop8h 15mUnited Airlines

Deal found 26/3£315

Tue 1/412:51MDW - LHR

1 stop11h 54mKLM

Deal found 25/3£319

Sat 5/421:05ORD - LHR

2 stops17h 55mAir Canada

Deal found 26/3£321

Sun 6/418:15ORD - LHR

2 stops13h 30mDelta

Deal found 26/3£333

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

Fri 25/4

22:15-20:20

1 stop16h 05m

London Heathrow

Fri 2/5

21:25-18:15

1 stop26h 50m

£457

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 23/8

19:15-17:40

1 stop16h 25m

London Heathrow

Mon 1/9

10:20-16:10

1 stop11h 50m

£458

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 22/4

07:20-06:30

1 stop17h 10m

London Heathrow

Sun 27/4

14:05-20:00

1 stop11h 55m

£479

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 21/4

15:45-08:00

1 stop10h 15m

London Heathrow

Tue 29/4

13:25-19:00

1 stop11h 35m

£482

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 21/4

09:20-08:55

1 stop17h 35m

London Heathrow

Tue 29/4

11:45-18:20

1 stop12h 35m

£487

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 30/4

07:20-08:35

2 stops19h 15m

London Heathrow

Fri 9/5

06:00-12:10

1 stop12h 10m

£489

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 21/4

22:20-12:15

Nonstop7h 55m

London Heathrow

Tue 29/4

10:20-17:50

1 stop13h 30m

£491

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 1/5

08:50-06:30

1 stop15h 40m

London Heathrow

Tue 6/5

08:15-21:54

1 stop19h 39m

£497

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 1/5

19:10-09:05

Nonstop7h 55m

London Heathrow

Thu 8/5

09:15-11:45

Nonstop8h 30m

£500

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 23/9

13:06-06:20

1 stop11h 14m

London Heathrow

Thu 2/10

14:25-17:00

Nonstop8h 35m

£501

Flights are sorted by cheapest return flights first.

Deals found on 27/3

Showing 1-10 of 39 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 10% on the flight price compared to flying in the evening, which is usually more expensive.

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

7,895 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

7,895 reviews

Delta

8.0

Very Good

7,895 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

1,321 reviews

Delta

8.0

Very Good

7,895 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

1,267 reviews

Delta

8.0

Very Good

7,895 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.

Austrian Airlines

7.5

Good

769 reviews

Delta

8.0

Very Good

7,895 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

1,570 reviews

Delta

8.0

Very Good

7,895 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 £457, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include Scandinavian Airlines and Virgin Atlantic. Icelandair is priced at 24% 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 £206 on Icelandair. Other airlines that offer cheap prices include JetBlue from £209 and TAP AIR PORTUGAL from £210 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 (87%), Air Canada (80%) and Austrian Airlines (80%).
What are the cheapest flights from Chicago to London Heathrow Airport?
While on average a flight from Chicago to London Heathrow Airport is generally £3,170, our data shows the cheapest flight currently is £286. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £349 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

Croydon

Luton

Slough

Eastbourne

Wembley

Northampton

Swindon

Hayes

Ilford

Crawley

Southend-on-Sea

Winchester

Maidstone

Ipswich

Watford

Southall

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£369	Average£716	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
American Airlines	Cheapest£397	Average£776	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Iberia	Cheapest£463	Average£646	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£494	Average£674	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£503	Average£859	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£515	Average£729	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 £206

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 1/4. 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 January or February, booked 68 days in advance, depart on a Wednesday or Monday 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 27 March 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 27 March 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 21 March 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 27 March 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?

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?

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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 27 March 2025.