Find Cheap Flights from Chicago to London Heathrow (CHI - LHR)

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Good to Know

Low Season:
March
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
21%
expected price increase
Average Price:
$981
(avg. price over the last 2 weeks)
Good Deal:
$770
or less (round trip)

When to Book Flights from Chicago to London Heathrow

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $769 or less.
The cheapest flight from Chicago to London Heathrow was found 48 days before departure, on average.
Book at least 4 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is March.
On average*, there is no price difference when choosing to fly in the morning or the evening on this flight route.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Chicago to London Heathrow Flights

How long does a flight from Chicago to London Heathrow take?
An average nonstop flight takes 7h 45m, covering a distance of 3936 miles.
How many flights are there between Chicago and London Heathrow?
There are 1,019 (nonstop) flights between Chicago and London Heathrow per week, averaging 141 per day.
Which airlines provide the cheapest flights from Chicago to London Heathrow?
In the past 3 days, the cheapest round-trip tickets were found on SAS ($526), Icelandair ($530) and Finnair ($579).
Do I need a passport to fly between Chicago and London Heathrow?
Yes.
Which airlines fly most frequently between Chicago and London Heathrow?
Finnair (18 times daily), British Airways (18 times daily), American Airlines (16 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Chicago to London Heathrow?
For Chicago to London Heathrow, Sunday is the cheapest day to fly on average and Saturday is the most expensive. Flying from London Heathrow back to Chicago, the best deals are generally found on Tuesday, with Saturday being the most expensive.

Book cheap flights from Chicago to London Heathrow (round-trip)

Airports
Origin
Chicago
$526
only
$526
$599
only
$599
Destination
London
$526
only
$526
Sun, Feb 25
ORD
LHR
15h 15m
Sun, Mar 4
LHR
ORD
26h 40m
Trip: 8 days
7.6GoodShow reviews
Overall 7.6 Good
Based on 3953 reviews
Overall
7.8
Boarding
7.9
Comfort
7.6
Crew
8.2
Entertainment
7.2
Food
7.1
EWR
OSL
Good 7.0

The flight from EWR to Oslo was delayed by over 2 hours which meant I would miss my next connection... and I understand that happens sometimes. But, it was after hours on the airline number phone number and the fly.com customer service could not help with finding an alternate connection from Oslo to FRA. It was frustrating to then have to wait at Oslo airport for another 4 hours before the new connecting flight.

ARN
ORD
Good 6.3

The water bottles, pillow, and earbuds were on the seats.

The returning flight to the US they did not dim the lights so that it was comfortable to sleep. A red light was shining down on my head most of the trip because I had a window seat. It was very annoying.

CPH
IAD
Good 7.0

Pleasant and safe flught

CDG
ARN
Mediocre 2.3

How possible with any criteria could charge 33€ for 1.5 such exagerate no good company at all ..

EWR
ARN
Excellent 10.0

Timely & helpful

Nothing

Fri, May 4
ORD
LHR
18h 40m
Sun, May 6
LHR
ORD
11h 10m
Trip: 3 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6711 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
KEF
BOS
Excellent 8.6

Crew was friendly, like the bigger plane and direct flight.

Luggage fees!!!

BRU
KEF
Excellent 8.0

Everything went okay for us on this flight. In the future, I will suggest to my wife, who books air travel for us to read the fine print. The cost to check a bag was $100.00 which would have run us $300.00 for the trip: Boston to Brussels with a layover in Reykjavik, but on the return Brussels to Reykjavik with four days in Iceland and the return to Boston, so there goes the cheap flight! I did enjoy the in-flight movie and a documentary on the return trip as well.

My own earphones on the flight from Brussels to Iceland did not work. I could not plug them into the system.

KEF
OSL
Excellent 8.0

We were ahead of schedule, which was nice

BOS
KEF
Good 7.6

They provided a pillow and blanket which was very nice, and the crew were helpful in finding space for items during take-off and landing. The boarding and exiting were fairly quick.

Everything on board costs extra, including basic drinks and snacks, but that's to be expected on cheaper flights. I assumed that the inflight movies cost money as well, although I didn't watch any because I didn't have headphones.

BRU
KEF
Excellent 10.0

My exit aisle seat was just great, with no one on either side of me !!!!! Very kind airplane staff. I had a great sleep.

nothing

Fri, Apr 6
ORD
LHR
7h 50m
Fri, Apr 20
LHR
ORD
8h 40m
Trip: 15 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 45 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
ORD
LHR
Good 7.6

Everything else

Both the British Airways attendant who check me in in Chicago, and the British Airways attendant who checked me in in London, were not paying attention to my final destination and did not mark my luggage for my final destination.

ORD
LHR
Okay 4.3

Flight attendants

Operated by American. Delayed for 4 hours

ORD
LHR
Okay 4.3

Seats were comfortable with plenty of room.

Plane was broken and we had to wait 3 1/2 hours to get a new plane. Crew kept awkwardly mentioning during every announcement that the delay wasn't their fault... My husband's entertainment screen was broken and flickering so much that all shows/films were completely unwatchable. My screen began flickering 1/2way through a film.

ORD
LHR
Excellent 10.0

Checking was a breeze and there were no hassles getting through security. The flight was great and they even had a vegetarian option for my meal! I would highly recommend to anyone for International flight!

ORD
LHR
Excellent 10.0

Nice one

Nice one

Mon, May 7
ORD
LHR
8h 05m
Mon, May 14
LHR
ORD
12h 50m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 27
ORD
LHR
19h 25m
Wed, Apr 11
LHR
ORD
11h 55m
Trip: 16 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 58 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
ORD
LHR
Excellent 8.6

Everything except the entertainment.

TV monitors are too small and grainy. Would have also liked music to listen too if can't watch the tiny screen.

ORD
LHR
Mediocre 3.6

It was Christmas Day and kudos to the captain and crew

Food just don’t bother - no access to united movies - shameful terms - paid and WiFi not work on the flight to watch

ORD
LHR
Okay 5.0

The price!

Our flight wasn't on a Brussels jet, but United Airlines. It wasn't only a different carrier, but a different flight number. We only learned of this when we weee rising to OHare and asked a United Airlines pilot about it. He directed us to the right place. In London our itinerary indicated a flight on Lufthansa, but it was United and a different flight number, too. This is confusing and the practice needs to change!

ORD
LHR
Okay 5.0

8 hour international flight and no leg room but worse was no entertainment... a pathetically small back of seat screen with very limited programming supplemented with access via your iPad... should have been great but no access at all on both legs as you access via unitedwifi which is just not strong enough. Great staff and the rest of the flight was fine

ORD
LHR
Excellent 9.6

small video monitor

Fri, Apr 6
MDW
LHR
10h 16m
Fri, Apr 20
LHR
MDW
14h 35m
Trip: 15 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 1065 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
MEL
AKL
Good 6.3

Great crew, easy boarding, comfortable enough flight

Could have used a charger for electronics, especially because we were expected to use our own device for entertainment. Didn't order food, but didn't look digestible

LAS
LGW
Excellent 10.0

Excellent

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

SYD
LAX
Good 7.3

Nothing really!

I was coming from Sydney and I have to hurry up to take the other fly to Newark and didn’t have time to buy for nothing to eat but I was very surprised they didn’t offer me anything on the plane and when I ask they I have buy it online and didn’t have many choices anyway, I very disappointed with this fly.

LAX
BNE
Good 7.0

I never expect airline food to be any good but I’m always hoping it’s edible. This was not the case, as the egg breakfast made me physically ill.

Sat, Mar 3
ORD
LHR
7h 50m
Mon, Mar 5
LHR
ORD
9h 15m
Trip: 3 days
4.6OkayShow reviews
Overall 4.6 Okay
Based on 1 reviews
Overall
8.2
Boarding
8.2
Comfort
8.0
Crew
8.5
Entertainment
7.4
Food
7.5
ORD
LHR
Okay 4.6

nice bit of bread you call breakfast. and the screen was so small i didn't bother trying to watch anything.

SJJ
VIE
Mediocre 2.0

Flyght was terible

SKP
VIE
Excellent 8.0

The fact that the luggage wasn’t included in the Austrian flight, nor anywhere was pointed out to that so I had to pay extra for it.

EWR
VIE
Good 7.0

muffin for breakfast ?

VIE
PRG
Mediocre 3.3

Flyght was terible

Mon, Mar 26
ORD
LHR
8h 05m
Tue, Apr 3
LHR
ORD
13h 30m
Trip: 9 days
5.7OkayShow reviews
Overall 5.7 Okay
Based on 8 reviews
Overall
8.2
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.7
ORD
LHR
Okay 4.0

Flight was canceled. They packed us on another one 3 hours later. Crying babies, bad food and uncomfortable, squishy seats made the flight unpleasant.

FRA
YVR
Good 6.0

Food is provided

Delayed 6 hours on the plane

ORD
LHR
Good 7.0

The crew was great. I was served by a woman named Lori that was the best flight attendant I have ever encountered. Extremely polite and at tentative to every need. Always asking if everything was alright and how she could make the flight better for me. She took a genuine interest in me and my travels. We engaged in great conversation and she was extremely pleasant. Thank you Lori!

The in flight entertainment on the back seat did not work. Also, I paid over $16 for Internet to work during the flight and it constantly kept dropping signal and connection. The router went in and out all flight. It should have been reimbursed but was never taken care of.

ORD
LHR
Okay 4.0

the crew did the best they could

the seats on the plane were so cramped....and I am not a fat or tall person; 5'7" and 130 lbs..... for a 7 hour flight.... I'll avoid booking on this plane..... it was a United Airlines plane btw.....not Lufthansa.

KBP
FRA
Excellent 10.0

The price was fair and updated information on flights were sent to my phone.

Mon, Mar 26
MDW
LHR
12h 44m
Tue, Apr 3
LHR
MDW
27h 14m
Trip: 9 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1756 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.4
AMS
TPE
Excellent 9.3

Service impeccable!

They have one line of executive class after the kitchen and toilet, is very noisy.

IAD
AMS
Mediocre 2.0

They stole my money

AMS
NCL
Good 7.6

Pretty basic one hour flight so there's not much to complain about or praise about. I got some sleep which was good.

The crew had their general Dutch aloofness on form. Chatted to one of the stewardesses in Dutch up until she saw I had a British passport then she decided she could only speak English to me.

AMS
DTW
Mediocre 2.0

Amesterdam airport employee was really rude

PTY
AMS
Good 6.3

KLM crews look unhappy with their work. Everything they do is a favor not duty.

Mon, May 21
MDW
LHR
11h 06m
Wed, May 30
LHR
MDW
15h 28m
Trip: 10 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 16166 reviews
Overall
8.0
Boarding
8.1
Comfort
7.8
Crew
8.4
Entertainment
7.5
Food
7.4
GDL
ATL
Excellent 9.6

Expensive food

MSP
CZM
Excellent 10.0

Everything went smoothly.

All was good.

PIT
ATL
Excellent 10.0

I have always known of airlines to offer preboarding to those military members in uniform or on official orders. Delta took it one step further and allows prior service members to board also.

PVR
MSP
Good 7.3

They have few movies selection that was good

I like being in a big space faster. And clean good service I

SLC
YYZ
Excellent 9.6

Z

Wed, Jun 6
MDW
LHR
12h 45m
Tue, Jun 19
LHR
MDW
11h 25m
Trip: 14 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 2195 reviews
Overall
7.6
Boarding
7.7
Comfort
7.3
Crew
8.2
Entertainment
6.8
Food
7.1
CDG
LIS
Okay 4.0

The room between seats is unbearable.

CDG
BLL
Mediocre 2.0

Its been a week. My trip has ended. I still do not have my bags. Terrible customer service.

CDG
BEY
Good 6.6

The fresh bread and cheese.

The staff is very unprofessional in receiving the passengers and serving the drinks mainly. The luggage wasn’t received and after 24 hrs no news about it! It’s a shame

TXL
CDG
Excellent 8.0

Speed, courtesy of the flight attendants

Landing was a bit rough, understandable due to the weather.

CDG
SVO
Mediocre 3.6

It was delayed. I missed my flight. Now I don’t have a bag. I am not sure when I get it back or if I have to go all the way back to the airport

Mon, May 7
ORD
LHR
10h 15m
Sat, Jun 2
LHR
ORD
26h 50m
Trip: 27 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6711 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
KEF
EWR
Mediocre 2.8

My entertainment system stopped working 1/2 way through the flight and there was very little leg room that caused back pain

BRU
KEF
Excellent 8.0

Everything went okay for us on this flight. In the future, I will suggest to my wife, who books air travel for us to read the fine print. The cost to check a bag was $100.00 which would have run us $300.00 for the trip: Boston to Brussels with a layover in Reykjavik, but on the return Brussels to Reykjavik with four days in Iceland and the return to Boston, so there goes the cheap flight! I did enjoy the in-flight movie and a documentary on the return trip as well.

My own earphones on the flight from Brussels to Iceland did not work. I could not plug them into the system.

DEN
KEF
Okay 5.6

Entertainment...

Had a tray full of trash most of the way.. don’t they sell trash bags in Iceland?

ORY
KEF
Okay 4.0

They were helpful and let me check my boulder pad as sports equipment for free on the flight to paris.

BOS
KEF
Good 7.6

They provided a pillow and blanket which was very nice, and the crew were helpful in finding space for items during take-off and landing. The boarding and exiting were fairly quick.

Everything on board costs extra, including basic drinks and snacks, but that's to be expected on cheaper flights. I assumed that the inflight movies cost money as well, although I didn't watch any because I didn't have headphones.

Tue, Aug 14
ORD
LHR
8h 05m
Tue, Aug 28
LHR
ORD
12h 25m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 3
ORD
LHR
8h 05m
Wed, Apr 11
LHR
ORD
13h 05m
Trip: 9 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 58 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
ORD
LHR
Mediocre 3.6

It was Christmas Day and kudos to the captain and crew

Food just don’t bother - no access to united movies - shameful terms - paid and WiFi not work on the flight to watch

ORD
LHR
Excellent 10.0

Great

ORD
LHR
Excellent 9.6

Very limited movie choices on this 767 aircraft

ORD
LHR
Mediocre 2.0

Nothing at all!!! That should really tell you something!

The staff were rude, abrasive, ignored several passengers that were trying to get her attention before take off as 2 overhead bins were wide open and full to the brim. She of course was too busy playing on her cell phone in the back of the plane and ignored/silenced the passenger call button. They were so loud when people were sleeping, yelling ‘trash please’ every 5 minutes, we are not stupid, we can see what you are doing and if we have trash, we will give it to you - so please STOP disturbing my peace and let me bloody sleep!!!! I was never offered any food or drink during the entire flight, not even when I was awake - other airline attendants are more observant and come back and ask us when we are awake if we would like anything to eat or drink. So essentially that was 7 hours with nothing after having paid a little over $700 for what was seemingly the WORST transatlantic flight I’ve ever taken. I travel back and forth often, because I’m a dual national, but I will stick to BA or Virgin Atlantic - the planes and service are far superior to this pile of turd that goes by the name of United. There were no charging facilities (power outlet or USB port) and the TVs had such horrendous resolution that you would get a headache from having to squint at the screen.

ORD
LHR
Excellent 9.6

small video monitor

Tue, Mar 20
ORD
LHR
7h 45m
Mon, Mar 26
LHR
ORD
8h 50m
Trip: 7 days
4.6OkayShow reviews
Overall 4.6 Okay
Based on 1 reviews
Overall
8.2
Boarding
8.2
Comfort
8.0
Crew
8.5
Entertainment
7.4
Food
7.5
VIE
PRG
Mediocre 3.3

Flyght was terible

VIE
IAD
Good 6.0

clean airplane. staff friendly and helpful. good movie selection

austrian and lufthansa have the worst seats in the industry. good for seating for about 30 minutes ONLY. so tough that make the trip feel even longer. a charger is needed in economy (at least one every two seats). wifi has not made it to this long haul flight yet.

SKP
VIE
Excellent 8.0

The fact that the luggage wasn’t included in the Austrian flight, nor anywhere was pointed out to that so I had to pay extra for it.

SJJ
VIE
Mediocre 2.0

Flyght was terible

STR
ZRH
Excellent 8.5

Really impressed with the Austrian air staff representatives. Especially the folks at the ticket/checkin counter

That I did not fly this airlines before. They will be first on my list from now on.

Sun, Jun 3
ORD
LHR
7h 45m
Sun, Jun 10
LHR
ORD
8h 35m
Trip: 8 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 45 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
ORD
LHR
Mediocre 2.0

Not much.

The flight was delayed about 5 hours due to reasons no one really seemed to understand. Food was pretty bad as well.

ORD
LHR
Excellent 10.0

Nice one

Nice one

ORD
LHR
Excellent 10.0

When I arrived at CMI no ticket was issued for my second leg, so I could not use the internal transit bus to at Terminal 5 at ORD ("for ticketed passengers only). I had to exit use the external train (which was delayed) and go through the very slow Terminal 5 security. Almost missed my ORD-LHR flight (arrived at the gate after the official closing time)

ORD
LHR
Okay 5.3

Food ok. Service fine, grew nice.

Last on board no cargo space..Sears are not great. Passenger behind my wife was pounding on the video games I the entertainment system the whole flight.

ORD
LHR
Excellent 10.0

Checking was a breeze and there were no hassles getting through security. The flight was great and they even had a vegetarian option for my meal! I would highly recommend to anyone for International flight!

Thu, May 3
MDW
LHR
13h 05m
Mon, May 14
LHR
MDW
12h 07m
Trip: 12 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 1065 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
LAX
MEL
Excellent 10.0

Talk about an awesome experience. I loved the friendly staff and the accommodations were superb. I could ask for no better. Even the food was excellent.

I have nothing but praise.

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

MCO
LGW
Mediocre 2.0

My flight was cancelled due to technical problems! Hope to be on another flight today as I missed my connecting flights too!!

MEL
AKL
Okay 4.6

Flight was an hour and a half late boarding, sat on the tarmac for 45 minutes, and there was no offer of complimentary beverages. Very barebones level of service.

LAX
BNE
Good 7.0

I never expect airline food to be any good but I’m always hoping it’s edible. This was not the case, as the egg breakfast made me physically ill.

Mon, Aug 13
ORD
LHR
8h 05m
Mon, Aug 27
LHR
ORD
12h 25m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Apr 21
ORD
LHR
10h 15m
Wed, May 2
LHR
ORD
11h 10m
Trip: 12 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6711 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
SEA
KEF
Excellent 8.0

Blankets and pillows at each seat

Only one drink service on a very long flight. very expensive food choices.

ORD
KEF
Good 7.3

Friendly staff Good entertainment options USB at every seat

Food options very expensive

KEF
BOS
Excellent 8.6

Crew was friendly, like the bigger plane and direct flight.

Luggage fees!!!

KEF
SEA
Okay 4.0

Flight attendants were attractive

On the way back sat on plane waiting for 2 hours due to mechanical issues, then 30-94th more hours eating as flight got cancelled. They charged me for bring my boulder pad back.

DEN
KEF
Excellent 8.0

Surprised by very large bag fees, reservation was unclear about baggage allowance and charges.

Sat, Jul 28
ORD
LHR
18h 05m
Wed, Aug 15
LHR
ORD
15h 33m
Trip: 19 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 16166 reviews
Overall
8.0
Boarding
8.1
Comfort
7.8
Crew
8.4
Entertainment
7.5
Food
7.4
ATL
PIT
Excellent 9.0

Pilots and crew did an amazing job during unstable air coming into Pittsburgh. Great job.

ATL
EWR
Excellent 8.6

No LCD screen for entertainment.

LAX
MCO
Excellent 10.0

I am used to flying Frontier because of cost but recently traveled Delta and boy did I feel completely spoiled! Not only did my other half get our bags for free due to his status with Delta but the amenities they offer and the comfort of the economy seats compared to other airlines is a major difference. As a chronic pain patient, if I can find a Delta flight for a little more, I will be booking with them for sure! Highly recommend them!

GDL
ATL
Excellent 9.6

Expensive food

JFK
CDG
Excellent 10.0

The food and the service

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Chicago to London Heathrow Flight Information

Avg. Flight Duration 8h 18m
Flights Arrive in London Heathrow
Flights Depart from Chicago
Flight Price $526
Distance 3936 miles
Airlines SAS, Icelandair, Finnair, United, Virgin Atlantic, Austrian Airlines, Lufthansa, KLM, Delta, Air France
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.