Find Cheap Flights from Lambert-St Louis to London Heathrow (STL - LHR)

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Mon 1/22
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Good to Know

Low Season:
February
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
19%
expected price increase
Average Price:
$1389
(avg. price over the last 2 weeks)
Good Deal:
$995
or less (round trip)

When to Book Flights from Lambert-St Louis 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 $994 or less.
The cheapest flight from Lambert-St Louis to London Heathrow was found 90 days before departure, on average.
Book at least 1 week 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 February.
Morning departure is around 12% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Lambert-St Louis to London Heathrow Flights

How long does a flight from Lambert-St Louis to London Heathrow take?
An average nonstop flight takes 11h 20m, covering a distance of 4190 miles.
Which airlines provide the cheapest flights from Lambert-St Louis to London Heathrow?
In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($735), Finnair ($773) and Air Canada ($788).
Do I need a passport to fly between Lambert-St Louis and London Heathrow?
Yes.
What’s the cheapest day of the week to fly Lambert-St Louis to London Heathrow?
For Lambert-St Louis to London Heathrow, Tuesday is the cheapest day to fly on average and Saturday is the most expensive. Flying from London Heathrow back to Lambert-St Louis, the best deals are generally found on Saturday, with Sunday being the most expensive.

Book cheap flights from Lambert-St Louis to London Heathrow (round-trip)

Airports
Origin
St. Louis
$735
only
$735
Destination
London
$735
only
$735
Tue, May 15
STL
LHR
47h 07m
Tue, May 29
LHR
STL
23h 38m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Apr 22
STL
LHR
14h 20m
Thu, May 3
LHR
STL
12h 17m
Trip: 12 days
7.7GoodShow reviews
Overall 7.7 Good
Based on 2867 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
KAO
HEL
Excellent 8.3

We where really late and they where very helpfull.

JFK
HEL
Excellent 10.0

calming environment, finnish style

on the flight to new york i got a game sandwich. i like that. brining finnish culture to us. but on the way from new york to helsinki i got a boring bagel.

HEL
LHR
Excellent 10.0

I think this airline has an attention to detail and level of service which surpasses most other airlines. Whilst remaining competitive these factors make traveling with Finnair a far more comfortable and attractive proposition for me. In addition, Helsinki airport must be one of the best around.

JFK
HEL
Good 6.3

A330 throne seat (2A) is nice and private.

Flight attendant in business class was quite terse and rude.

LED
HEL
Good 6.5

Nice crew that were helpful.

Small plane, cramped seating.

Wed, Apr 4
STL
LHR
11h 20m
Wed, Apr 18
LHR
STL
18h 39m
Trip: 15 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 20991 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
TPE
YVR
Excellent 10.0

The AC in-flight staff are always very nice. It was a pleasant flight

YOW
LHR
Excellent 8.0

Great service from flight attendants. Flight was smooth once airborne

Delayed Flight Seats seemed very small for an Air Canada Plane

HKG
YYZ
Mediocre 3.6

Our flight from Toronto to Houston was cancelled. The staff at the arrival counter was very slow and rude. We wanted to leave by the United flight which was leaving in an hour or so but the supervisor was not willing to do anything. We ordered Asian vegetarian food and it was horrible. Never again Air Canada.

YYZ
BOS
Excellent 8.0

Everything was seamless and i have no complaints. My return flight was cancelled amd i was automatically put on a different flight, and instead of waiting more than 2 hours from boston to get to canada, i was put on an earlier flight for which i am thankful for. However we couldnt take off as delta was clogging up the way to the runaway so ended up waitimg an hour to taje off which was ridiculous. Hope delta hires more ground crew so that others arent inconvenienced in the future.

YVR
YYC
Mediocre 3.6

OK service

was not offered a direct flight to Vancouver when it was obvious that I would miss the connecting flight.

Tue, Apr 10
STL
LHR
14h 55m
Wed, Apr 18
LHR
STL
13h 56m
Trip: 9 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 1023 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
LHR
SFO
Excellent 10.0

So much food!! They kept bringing food out the whole flight..The seats were great. It was a very comfortable flight

no complaints whatsoever!

BOS
LHR
Excellent 9.6

Francesca was the flight attende t that I had most the most interactions with was very friendly and warm.

LHR
BOS
Okay 5.0

We haven’t possiblyty to check in online. Crew smell was terrible, ladies used some perfume, some people was allergic to it

MEL
LAX
Excellent 8.0

These seats are small

JFK
LHR
Okay 4.0

Once In London, we were told by British Airways that was flying us to Nice that Delta had “lost” our infant electronic ticket - It took 1.5h to get new ticket reissued! We missed our connection and had to wait 3 more hours for the next flight - We were somewhat lucky as multiple flights were delayed/cancelled that day - I will avoid using Virgin Atlantic in the future as they need Delta and British operate their flights and this makes it prone to issues like that

Sat, Apr 7
STL
LHR
20h 35m
Thu, Apr 19
LHR
STL
16h 37m
Trip: 13 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53874 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MBJ
EWR
Okay 5.6

Not a whole lot, the flight and comfort were fine. The flight attendants were great.

There was NO entertainment on board unless you paid $7.99, including watching the progress of the flight from Montego Bay, Jamaica to Newark.

RST
ORD
Okay 5.3

Efficient boarding and on time departure/arrival.

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing).

JAX
ORD
Mediocre 3.6

The credit was polite, hat was about it

We were delayed coming out bc the plane needed de-icing... IN JACKSONVILLE, but they were unable to get manager approval for de-icing and then the truck was out of fuel. Finally, the pilot moved the plane into the sun (which should have happened much sooner). During the flight, the cabin temperature dropped to low 60s and everyone was freezing.

ORD
SAN
Okay 4.3

On time departure

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing). Terminal boarding area was too cold.

IAD
CDG
Excellent 10.0

Got a window seat and had an amazing crew. Everything went smoothly! Dinner and breakfast served!

Everything was perfect!

Tue, Feb 20
STL
LHR
35h 25m
Mon, Feb 26
LHR
STL
28h 57m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Apr 8
STL
LHR
19h 25m
Wed, Apr 18
LHR
STL
18h 39m
Trip: 11 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 20991 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
YUL
GVA
Mediocre 2.0

Nothing

Canceled flight , delayone day , I should rebook by myself by calling the air canada call center I will considre next time when reseving with Air Canada , and Kayak because you didn't even know what happen with me , I took flight to London next day since my flight was canceled

LAX
YYZ
Mediocre 2.0

Nothing

The customer service was disgraceful. Air Canada has set the bar very, very low.

HKG
YYZ
Mediocre 3.6

Our flight from Toronto to Houston was cancelled. The staff at the arrival counter was very slow and rude. We wanted to leave by the United flight which was leaving in an hour or so but the supervisor was not willing to do anything. We ordered Asian vegetarian food and it was horrible. Never again Air Canada.

YVR
ICN
Excellent 10.0

Great Service.

Nothing

LAX
YVR
Excellent 10.0

Great service

Nothing

Sun, Apr 8
STL
LHR
11h 20m
Thu, Apr 19
LHR
STL
15h 37m
Trip: 12 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53874 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MEL
LAX
Okay 5.6

The cabin crew were very kind and helpful, always smiling and happy to be of service.

It wasn't Air New Zealand, but operated by United Airlines. The plane was uncomfortable, and the entertainment system seemed clunky, unintuitive and outdated. The selection of entertainment, poor in quality, I thought. There were lost of things to watch, but a lot of it was of poor quality. The food was acceptable, but again, it felt like it was done on-the-cheap, and I was eating airline food a la 20 years ago.

DEN
SFO
Excellent 8.6

Good flight with no issues.

No complaints

EWR
CMH
Good 6.8

The onboard wifi was not working.

RST
ORD
Okay 5.3

Efficient boarding and on time departure/arrival.

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing).

MBJ
EWR
Okay 5.6

Not a whole lot, the flight and comfort were fine. The flight attendants were great.

There was NO entertainment on board unless you paid $7.99, including watching the progress of the flight from Montego Bay, Jamaica to Newark.

Tue, May 15
STL
LHR
20h 57m
Tue, May 22
LHR
STL
18h 45m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Apr 9
STL
LHR
11h 20m
Wed, Apr 18
LHR
STL
18h 39m
Trip: 10 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 20991 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
HKG
YYZ
Mediocre 3.6

Our flight from Toronto to Houston was cancelled. The staff at the arrival counter was very slow and rude. We wanted to leave by the United flight which was leaving in an hour or so but the supervisor was not willing to do anything. We ordered Asian vegetarian food and it was horrible. Never again Air Canada.

YVR
LAX
Excellent 10.0

End of a long ordeal... I slept the entire flight

TPE
YVR
Excellent 10.0

The AC in-flight staff are always very nice. It was a pleasant flight

LAX
YYZ
Mediocre 2.0

Nothing

The customer service was disgraceful. Air Canada has set the bar very, very low.

YVR
ICN
Excellent 10.0

Great Service.

Nothing

Mon, Apr 9
STL
LHR
17h 00m
Thu, Apr 19
LHR
STL
18h 01m
Trip: 11 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53874 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MBJ
EWR
Okay 5.6

Not a whole lot, the flight and comfort were fine. The flight attendants were great.

There was NO entertainment on board unless you paid $7.99, including watching the progress of the flight from Montego Bay, Jamaica to Newark.

ORD
SAN
Okay 4.3

On time departure

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing). Terminal boarding area was too cold.

IAD
CDG
Excellent 10.0

Got a window seat and had an amazing crew. Everything went smoothly! Dinner and breakfast served!

Everything was perfect!

TPA
ORD
Excellent 8.0

The crew were always really helpful and kind. They were happy to speak English or Japanese.

Despite stitching when I could and as soon as I could. Lower back buttocks hurt pretty bad half way through the flight. This is a knock on the airline industry and not so much ANA. Comfort levels start diminish when you try to squeeze as many seats as you can into airplane. Especially, for people like me who are at least 6' tall. Also, the food was very meh. This was surprising because all my other experiences with ANA were quite the opposite.

JAX
ORD
Mediocre 3.6

The credit was polite, hat was about it

We were delayed coming out bc the plane needed de-icing... IN JACKSONVILLE, but they were unable to get manager approval for de-icing and then the truck was out of fuel. Finally, the pilot moved the plane into the sun (which should have happened much sooner). During the flight, the cabin temperature dropped to low 60s and everyone was freezing.

Fri, May 4
STL
LHR
19h 57m
Tue, May 22
LHR
STL
18h 45m
Trip: 19 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 10
STL
LHR
15h 50m
Wed, Apr 18
LHR
STL
18h 39m
Trip: 9 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 20991 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
LAX
YYZ
Mediocre 2.0

Nothing

The customer service was disgraceful. Air Canada has set the bar very, very low.

HKG
YYZ
Mediocre 3.6

Our flight from Toronto to Houston was cancelled. The staff at the arrival counter was very slow and rude. We wanted to leave by the United flight which was leaving in an hour or so but the supervisor was not willing to do anything. We ordered Asian vegetarian food and it was horrible. Never again Air Canada.

YUL
GVA
Mediocre 2.0

Nothing

Canceled flight , delayone day , I should rebook by myself by calling the air canada call center I will considre next time when reseving with Air Canada , and Kayak because you didn't even know what happen with me , I took flight to London next day since my flight was canceled

YVR
YYC
Mediocre 3.6

OK service

was not offered a direct flight to Vancouver when it was obvious that I would miss the connecting flight.

YVR
ICN
Excellent 10.0

Great Service.

Nothing

Tue, Apr 10
STL
LHR
11h 20m
Thu, Apr 19
LHR
STL
18h 01m
Trip: 10 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53874 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
EWR
CMH
Good 6.8

The onboard wifi was not working.

LAX
BJX
Excellent 10.0

On time, no issues.

EWR
IND
Good 7.0

Staff was excellent. From check in to flight crew. On time and earlier arrival. Unexpected.

Unable to bring some carryon. No coffee available on board.

DEN
SFO
Excellent 8.6

Good flight with no issues.

No complaints

RST
ORD
Okay 5.3

Efficient boarding and on time departure/arrival.

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing).

Mon, May 7
STL
LHR
20h 57m
Tue, May 22
LHR
STL
18h 45m
Trip: 16 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Apr 11
STL
LHR
19h 30m
Wed, Apr 18
LHR
STL
18h 39m
Trip: 8 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 20991 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
YOW
LHR
Excellent 8.0

Great service from flight attendants. Flight was smooth once airborne

Delayed Flight Seats seemed very small for an Air Canada Plane

EWR
YYZ
Mediocre 3.0

Nada

Always late, overall service is appalling. Only reason they are around is due to protective policies of the Canadian government

YVR
ICN
Excellent 10.0

Great Service.

Nothing

YYZ
CPH
Good 6.6

The crew, Very attentive.

The flød.

YVR
LAX
Excellent 10.0

End of a long ordeal... I slept the entire flight

Wed, Apr 11
STL
LHR
14h 55m
Thu, Apr 19
LHR
STL
19h 38m
Trip: 9 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53874 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MEL
LAX
Okay 5.6

The cabin crew were very kind and helpful, always smiling and happy to be of service.

It wasn't Air New Zealand, but operated by United Airlines. The plane was uncomfortable, and the entertainment system seemed clunky, unintuitive and outdated. The selection of entertainment, poor in quality, I thought. There were lost of things to watch, but a lot of it was of poor quality. The food was acceptable, but again, it felt like it was done on-the-cheap, and I was eating airline food a la 20 years ago.

ORD
SAN
Okay 4.3

On time departure

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing). Terminal boarding area was too cold.

EWR
CMH
Good 6.8

The onboard wifi was not working.

RST
ORD
Okay 5.3

Efficient boarding and on time departure/arrival.

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing).

EWR
IND
Good 7.0

Staff was excellent. From check in to flight crew. On time and earlier arrival. Unexpected.

Unable to bring some carryon. No coffee available on board.

Sat, Apr 28
STL
LHR
19h 42m
Sat, May 5
LHR
STL
24h 18m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Apr 22
STL
LHR
11h 20m
Wed, May 2
LHR
STL
20h 23m
Trip: 11 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 20991 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.4
YVR
LAX
Excellent 10.0

End of a long ordeal... I slept the entire flight

YVR
YYC
Mediocre 3.6

OK service

was not offered a direct flight to Vancouver when it was obvious that I would miss the connecting flight.

LAX
YYZ
Mediocre 2.0

Nothing

The customer service was disgraceful. Air Canada has set the bar very, very low.

YUL
GVA
Mediocre 2.0

Nothing

Canceled flight , delayone day , I should rebook by myself by calling the air canada call center I will considre next time when reseving with Air Canada , and Kayak because you didn't even know what happen with me , I took flight to London next day since my flight was canceled

LAX
YVR
Excellent 10.0

Great service

Nothing

Tue, Apr 24
STL
LHR
12h 15m
Tue, May 8
LHR
STL
16h 23m
Trip: 15 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 53874 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MEL
LAX
Okay 5.6

The cabin crew were very kind and helpful, always smiling and happy to be of service.

It wasn't Air New Zealand, but operated by United Airlines. The plane was uncomfortable, and the entertainment system seemed clunky, unintuitive and outdated. The selection of entertainment, poor in quality, I thought. There were lost of things to watch, but a lot of it was of poor quality. The food was acceptable, but again, it felt like it was done on-the-cheap, and I was eating airline food a la 20 years ago.

LAX
BJX
Excellent 10.0

On time, no issues.

RST
ORD
Okay 5.3

Efficient boarding and on time departure/arrival.

No complementary food. Old plane, no great entertainment options (should also have subtitles for hard of hearing).

EWR
CMH
Good 6.8

The onboard wifi was not working.

JAX
ORD
Mediocre 3.6

The credit was polite, hat was about it

We were delayed coming out bc the plane needed de-icing... IN JACKSONVILLE, but they were unable to get manager approval for de-icing and then the truck was out of fuel. Finally, the pilot moved the plane into the sun (which should have happened much sooner). During the flight, the cabin temperature dropped to low 60s and everyone was freezing.

Show more results

Lambert-St Louis to London Heathrow Flight Information

Flights Arrive in London Heathrow
Flights Depart from Lambert-St Louis
Flight Price $735
Distance 4190 miles
Airlines Finnair, Air Canada, Virgin Atlantic, United
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

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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.

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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.