LHR - STL

£342 Find Cheap Flights from London Heathrow Airport to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to St. Louis departing on 27/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to St. Louis.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to St. Louis.
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Everything you should know

Cheapest return fare
£503
Typical prices: £656-£819
American Airlines
Wed 13/5Sat 23/5
LHR - STL • 1 stop
Cheapest direct flights
£523
British Airways
Fri 15/5Wed 27/5
LHR - STL • Direct
Direct flights
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 0
Direct flights
Direct flights
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Direct flights
Direct flights
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Top airlines
Cheapest • from £503 (return)
Best reviews • 7.6 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Top stopover airports
Cheapest • Avg £144 (return)
Shortest trip • 3h 55m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Heathrow to St. Louis (LHR-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Heathrow to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Heathrow to St. Louis

Wed, 13 May - Sat, 23 May
American Airlines Logo
12:00 - 19:30
LHR
-
STL
13h 30m
1 stop
American Airlines Logo
13:45 - 10:30
STL
-
LHR
14h 45m
1 stop
£503American Airlines
Wed, 13 May - Wed, 27 May
Delta Logo
09:20 - 17:46
LHR
-
STL
14h 26m
1 stop
Delta Logo
16:20 - 10:20
STL
-
LHR
12h 00m
1 stop
£519Delta
Thu, 14 May - Wed, 27 May
American Airlines Logo
09:15 - 19:31
LHR
-
STL
16h 16m
1 stop
American Airlines Logo
14:36 - 10:30
STL
-
LHR
13h 54m
1 stop
£519American Airlines
Fri, 15 May - Wed, 27 May
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£523British Airways
Thu, 14 May - Sat, 23 May
American Airlines Logo
09:45 - 19:33
LHR
-
STL
15h 48m
1 stop
American Airlines Logo
13:45 - 10:30
STL
-
LHR
14h 45m
1 stop
£526American Airlines
Wed, 13 May - Wed, 27 May
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£528British Airways
Wed, 13 May - Sun, 24 May
American Airlines Logo
12:15 - 22:19
LHR
-
STL
16h 04m
1 stop
American Airlines Logo
11:18 - 07:50
STL
-
LHR
14h 32m
1 stop
£531American Airlines
Wed, 13 May - Mon, 25 May
Delta Logo
09:20 - 16:10
LHR
-
STL
12h 50m
1 stop
Delta Logo
10:15 - 07:10
STL
-
LHR
14h 55m
1 stop
£534Delta
Thu, 14 May - Tue, 26 May
Delta Logo
09:20 - 16:10
LHR
-
STL
12h 50m
1 stop
Delta Logo
10:15 - 07:10
STL
-
LHR
14h 55m
1 stop
£541Delta
Tue, 19 May - Wed, 27 May
American Airlines Logo
09:45 - 16:00
LHR
-
STL
12h 15m
1 stop
American Airlines Logo
14:36 - 10:30
STL
-
LHR
13h 54m
1 stop
£542American Airlines
Booking Insights

KAYAK’s insights & trends for Heathrow to St. Louis flights

Get data-powered insights and trends into flights from Heathrow to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from London Heathrow Airport to St. Louis?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from London Heathrow Airport to St. Louis departing in May.

What’s the cheapest day of the week to fly from London Heathrow Airport to St. Louis?

The average price of all round-trip flights from London Heathrow Airport to St. Louis clicked on KAYAK for each day over the last 12 months.

For London Heathrow Airport to St. Louis, Saturday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from St. Louis back to London Heathrow Airport, the best deals are generally found on Friday, with Tuesday being the most expensive.

What is the cheapest month to fly from London Heathrow Airport to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London Heathrow Airport to St. Louis is February, where tickets cost £562 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is £869 and £854 respectively.

Can I save money by flying with a stopover from London Heathrow Airport to St. Louis?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £689 on average.

How far in advance should I book a flight from London Heathrow Airport to St. Louis?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from London Heathrow Airport to St. Louis, you should book around 4 weeks before departure, which saves you about 36% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know - Cheap tickets from London Heathrow Airport to St. Louis

Low seasonJanuary
Cheapest flight£342
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly (16% more expensive on average)
Flight from London Heathrow Airport to St. Louis

When to book flights from Heathrow to St. Louis

Are your dates flexible? Find out the best times to travel from Heathrow to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking London Heathrow Airport to St. Louis flights

  • What is the cheapest flight from London Heathrow Airport to St. Louis?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to St. Louis was £342 for a one-way ticket and £503 for a return.

  • Which airports will I be using when flying from London Heathrow Airport to St. Louis?

    London Heathrow Airport airport is called London Heathrow and the only airport in St. Louis is Lambert-St Louis.

  • Which aircraft models fly most regularly from London Heathrow Airport to St. Louis?

    The Boeing 787-8 Dreamliner is the aircraft model that flies most regularly on the London Heathrow Airport to St. Louis flight route.

  • Which airline alliances offer flights from London Heathrow Airport to St. Louis?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between London Heathrow Airport and St. Louis, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from London Heathrow Airport to St. Louis?

    You can catch a direct flight from London Heathrow Airport to St. Louis on Tuesday, Wednesday, Friday, and Sunday.

  • Which is the best airline for flights from London to St. Louis, KLM or Finnair?

    The two airlines most popular with KAYAK users for flights from London to St. Louis are KLM and Finnair. With an average price for the route of £836 and an overall rating of 7.8, KLM is the most popular choice. Finnair is also a great choice for the route, with an average price of £691 and an overall rating of 7.6.

  • How does KAYAK find such low prices on flights from London Heathrow Airport to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London Heathrow Airport to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London Heathrow Airport to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from London Heathrow Airport is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London Heathrow Airport to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to St. Louis with an airline and back to London Heathrow Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London Heathrow Airport to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from London Heathrow Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from London Heathrow Airport to St. Louis

  • Looking for a cheap flight from St. Louis to London Heathrow Airport? 25% of our users found flights on this route for St. Louis or less round-trip.

Prefer to fly direct from London Heathrow Airport to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from London Heathrow to Lambert-St Louis.
Find which airlines fly direct from London Heathrow Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

London Heathrow to Lambert-St Louis

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Friday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Direct returns

Lambert-St Louis to London Heathrow

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Friday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Reviews of the top 5 airlines flying from Heathrow to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from London to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Heathrow to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.6
FinnairOverall score based on 1371 reviews
7.7Boarding
7.5Comfort
6.7Food
6.9Entertainment
8.2Crew
Airline reviews

Positive: It was refreshingly easy and polite check-in and boarding staff. Flight was on time and Helsinki is a very well-signposted airport. Shopping was nice as well. Flight was not full and I had lots of space in economy. Flight was perfectly on time. Negative: Food and drink not very good, but that it is normal on any airline. Didn't expect anything else.

8.0 ExcellentFiruz, Feb 2026
HEL - ICN
Read more Finnair reviews

Positive: It was refreshingly easy and polite check-in and boarding staff. Flight was on time and Helsinki is a very well-signposted airport. Shopping was nice as well. Flight was not full and I had lots of space in economy. Flight was perfectly on time. Negative: Food and drink not very good, but that it is normal on any airline. Didn't expect anything else.

Business seating is soooo uncomfortable. You can sit straight up or lay down. You need pillows behind you because the back doesn’t lay down. Those are need to “prop” you up. The chair has no padding whatsoever. Food was gross. I’ve eaten on Finnair before and the food was exceptional. This time it gave 2 people in our party diarrhea. It was the chicken dish. I took 2 bites and didn’t eat anything more. The flight attendants were nice. You needed an additional lounge in Terminal D at DFW Airport. After waiting 40 minutes to enter, we finally gave up and went to a bar across from the club doors. I’m unsure if I’ll ever book a Finnair flight again.

It was a good flight, very comfortable seats for sleeping in business class. Probably the most comfortable business class seat I've ever had (20+ times in business class on various airlines). Service was good, but the only downside is my screen didn't work and it had to be reset multiple times to get it to shut off. I had to block my eyes because the screen was white almost the entire flight and I wore an eye mask when I slept. But when eating and reading in my seat, my eyes hurt because the only way to turn the screen off was reset it and the screen would only be off for a few minutes at a time.

Everything was wonderful! AirBus seats are more comfortable to sleep in as compared to the Boeing planes.

All reviews good because...flight from BWI to London ,economy seats was miserable. I usually book 1,step up from economy but this would have added 1500 bucks 1 way. Bit the bullet and upgraded for retun flight, otherwise all ratings would have been rock bottom.

Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly

It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.

Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.

This was an absolutely exceptional flight. The flight attendants were extremely attentive and very friendly. They seemed to go out of their way to make us comfortable and to make sure that we had everything we needed., We were in business and were very happy with the size and the details for our pods. We would definitely recommend Finnair and will definitely be flying with them again.

We had an excellent trip with Finnair. This was our first time and we’re very pleased. The only issue was with the boarding - it was a little bit confusing and needs a little bit of streamlining.

Both our flights were delayed. Almost didn’t get in the second flight. Staff was rude to the bone.

Hopped on time for the flight only to get deplaned and delayed another 2.5 hours.

Terrible experience! delay 2 time and say i dont have ticket

Both my flight where delayed Had 25min to make it to my transfer flight

Would've been great if Lufthansa union cockpit pilots didn't strike for 2 days and caused a chaos to my returning plans to USA, and then after rebooking a flight 2 days later tge plane departed 35 min later. So I did not have a good experience.

Everything was on time and service on the flight was great!

The boarding in Buenos Aires (at the on ramp) was not great. They had to check every carry on. Not a United problem but was a Buenos Aires problem.

Staff and aircraft were good. However, weather in Houston lee to a ground stop. We were looking at circling behind three other planes until the stop was lifted. Pilot said we didn’t have enough fuel for that. So we flew on to New Orleans as the closest port with immigration and customs staff. Landed there and sat in the plane for two hours plus while staff was sorted. Turned away by ICE. Waited for pilots to be switched out, but after they were approved by ICE. Then had to wait to get a runway because so many planes were ahead of us. Finally took off and flew back to Houston. We all missed our connecting flights because it took too long. Hotel voucher from United was only a link to booking site. Total BS. Finally got a flight out the next day after a night without sleep because all the Houston hotels were booked by rodeo and spring break crowds.

Wifi Bluetooth features for watching in flight movie was horrible. Screen kept blacking out no connection of sound although it said connected. Other than that smooth trip .

I paid $7,000 to fly round trip to Porto. I thought it was for business class. But on the leg from Miami to Newark, and again from Newark to Miami, i was in coach. One time in the middle seat of coach. From Newark to Porto I was in business class as expected, and it was fine. I fly to Portugal once per month, often paying $5,000 for business class. Usually i fly American Airlines. I'd be happy to fly more with United Airlines. But my experience was disappointing because i was put in the coach for almost half the flights.

My ticket did not exist when I got to the airport. I had to book another flight and was still charged by Kayak

Got denied my flight was told on Google that Air Canada was supposed to book me a flight back home because I never was able to go to my destination. They did not help me whatsoever. I had to book a whole new flight for that reason I would write this is zero

The plane was delayed an hour. Heard from other passengers that the Vancouver connection to SFO was never on-time.

My experience was good with United too But only not so good thing was that at Calgary airport I was not given lounge access despite of flying business. Aspire lounge denied it to me, which was unfair I feel

We left over 2 hours late and they didn't even give us a complimentary snack, when getting to the desk I asked if I could be put in a row with only 1 other person or an empt y one I was told the flight was full when the last two rows were empty. All around over it

they were super helpful. Agents at the desk got me on an earlier flight and I was able to get home several hours earlier.

This is a great non-stop YVR-MIA. Very comfortable plane, and no transfer through a city that gets major winter weather!

Terrible…. Reported missing luggage’s with injectable meds that needed refrigeration. Yet, delivery could not be expedited. Luggage’s were delivered 5 days after arrival. The meds were useless as ice pack had melted. So disappointed!!!

Air Canada’s problems are not staff related by and large, no. The problem is tiny jets between the U.S. and Canada - yes, believe it or not they are still “international” (just ask our own Mango Maniac in power in the U.S.). The little aisle is compounded by a design flaw of a “dog leg” starting at seat 12. Woe be unto you if you sit here as passengers and attendants do not have sufficient room to not hit you in the face with backpacks. One thing I will say very positively about Air Canada is you still provide pillows and blankets on transcontinental flights to all, not just the elites. Your tiny improperly designed jets are also a problem flying city to city within Canada also. One can only say you remind us of a “Jet Blue” or “Spirit” experience. Also your luggage space is downright Byzantine! We will endeavor to avoid you and use other U.S. carriers, albeit charging more.

Terrible canceled flight and lost my luggage. Flew me to Halifax. Tgat flight was delayed, had to spend night in airport chair.

How about changing the personal out to more friendly human beings? This team was pretty arrogant. No fun!!

Everything could have been better. What needed to be wrong with United went wrong

Excellent service. The crew goes above their way to make the customer comfortable.

It was good. The seats in economy weren’t bad

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Excellent service; they helped me reschedule so I can fly in an earlier flight

Wonderful staff. The boarding process can be improved a little better by adequate prior communication but all in all they did fine. However the boarding gate was quite unfreindly to elderly and who needs help with sevral stairs.

Flight map did not work. Crew was great, food was good, plane took off on time and landed early. That's all I can ask.

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Very good. Comfortable and I felt well taken care of from start to finish

the service on Business class should be improved to be at par with industry leaders like Cathay Pacific and Singapore AIrlines. A lot of room for improvement.

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Everything you need to know for your flight from Heathrow to St. Louis

Information on your arrival and departure airports