Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Chicago to London Heathrow Airport from £225

CHI — LHR
9 Oct — 16 Oct1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in February or January, booked 33 days in advance, depart on a Monday or Wednesday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Chicago to Heathrow

Mon 23/1119:15 -
1 stop32h 05m
Thu 26/1106:40 -
2 stops16h 05m
Deal found 5/9£521
Sat 24/1019:30 -
1 stop10h 20m
Wed 28/1020:35 -
1 stop26h 45m
Deal found 5/9£522
Mon 28/1218:30 -
1 stop10h 20m
Tue 12/112:15 -
1 stop11h 05m
Deal found 5/9£523
Wed 28/1019:30 -
2 stops20h 50m
Tue 10/1119:50 -
3 stops27h 30m
Deal found 7/9£524
Wed 28/1019:30 -
3 stops33h 05m
Wed 4/1106:40 -
2 stops16h 40m
Deal found 7/9£525
Tue 22/919:25 -
1 stop10h 30m
Wed 30/921:25 -
1 stop26h 50m
Deal found 5/9£527
Thu 29/1019:30 -
1 stop10h 20m
Thu 5/1112:15 -
1 stop11h 05m
Deal found 4/9£527
Tue 22/919:25 -
1 stop10h 30m
Tue 27/1020:35 -
1 stop26h 45m
Deal found 5/9£528
Fri 2/1022:25 -
1 stop31h 30m
Tue 24/1112:15 -
1 stop11h 05m
Deal found 5/9£529
Tue 20/1019:25 -
3 stops31h 55m
Tue 27/1006:40 -
2 stops16h 40m
Deal found 7/9£530
Tue 29/919:05 -
Nonstop8h 00m
Fri 29/107:30 -
1 stop13h 25m
Deal found 9/9£530
Sun 20/909:29 -
1 stop15h 41m
Tue 29/912:25 -
1 stop11h 54m
Deal found 9/9£544

Find flight deals from Chicago to Heathrow

Round-trip from

£521

One-way from

£225

Popular in

June

Cheapest in

February

Average price

£692

Good round-trip deal

£767 or less

Good one-way deal

£234 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 23/11-26/11
  • 3 total stops
  • 48h 10m total
  • Chicago to London
Search Deals
Icelandair
  • Icelandair
  • 5/1-31/12
  • 1 total stop
  • 19h 00m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£142 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£26 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
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

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

Cheapest return flight
Fastest return journey

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Tue 12/1

17:10-06:55

Nonstop7h 45m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£240

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Mon 11/1

13:55-07:10

1 stop11h 15m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£242

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 17/10

09:38-06:30

1 stop14h 52m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£243

ChicagoLondon

MDW Chicago Midway - LHR London Heathrow

MDWLHR

Chicago Midway

Mon 11/1

13:00-08:05

2 stops13h 05m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£243

ChicagoLondon

MDW Chicago Midway - LHR London Heathrow

MDWLHR

Chicago Midway

Sun 7/3

17:25-11:40

1 stop12h 15m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£243

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Wed 3/2

12:55-10:25

2 stops15h 30m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£243

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Mon 4/1

08:52-09:10

2 stops18h 18m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£243

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Mon 28/12

11:09-09:10

2 stops16h 01m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£265

ChicagoLondon

MDW Chicago Midway - LHR London Heathrow

MDWLHR

Chicago Midway

Tue 15/12

09:37-06:50

2 stops15h 13m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£266

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Fri 5/3

17:10-06:55

Nonstop7h 45m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£277

Flights are sorted by cheapest return flights first.

Deals found on 4/9

Showing 1-10 of 45 resultsSorted by cheapest first
1
2
3
...
5

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

Cheapflights Insights

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

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 £490). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £1,021). 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?

When flying from Chicago to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Chicago to London Heathrow Airport

The most flights from CHI to LHR are scheduled on a Tuesday (54 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (22 on average).

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 £600 and £795 in November.
The cheapest return price found within the last 5 days was £521 on Scandinavian Airlines (23 Nov–26 Nov).

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

Dublin (DUB) – chosen by Cheapflights users on 67% 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?

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £396.

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

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 10h 20m.

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

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

How often are flights from Chicago to London delayed?

About 24% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 166 minutes.

What is the most punctual flight time for Chicago to London flights?

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to London flights?

Over the past year, British Airways have had the lowest number of delays on this route, with just 24% of flights being delayed.

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

Booking 58 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.

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with 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.
British Airways
6.7
Okay
8,210 reviews
Check prices

Comfort

6.8

Crew

7.7

Overall

6.7

Entertainment

6.5

Boarding

7.0

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.
British Airways
6.7
Okay
8,210 reviews
British Airways
6.7
Okay
8,210 reviews
Check prices

Comfort

6.8

Crew

7.7

Overall

6.7

Entertainment

6.5

Boarding

7.0

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.

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 15h 21m. Fly via United Airlines, Scandinavian Airlines, or Virgin Atlantic to get the fastest option. The distance from Chicago to London Heathrow Airport is about 3942 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?

    Icelandair, at £361, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include American Airlines and British Airways. Icelandair is priced at 45% 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 £279 on Lufthansa. Other airlines that offer cheap prices include British Airways from £285 and Iberia from £293 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 (68%), Air Canada (64%) and Austrian Airlines (64%).

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

    While on average a flight from Chicago to London Heathrow Airport is generally £1,329, our data shows the cheapest flight currently is £228. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £439 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 £490). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £1,021). 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Milton Keynes
Luton
Gatwick
Wembley
Slough
Ilford
Hayes
Northampton
Croydon
Colchester
Eastbourne
Brentford
Enfield
Southend-on-Sea
Barnet
Salisbury
Watford
Southall
Swindon

Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from Chicago to Heathrow

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£361Average£609FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
American AirlinesCheapest£382Average£817FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£419Average£620FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£456Average£800FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£504Average£861FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£514Average£690FlexibilityNo cancel feeOn-time77%
Search Iberia flights
JetBlueCheapest£734Average£874FlexibilityNo cancel feeOn-time62%
Search JetBlue 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.