LHR - STL

£356 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 1/9. 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
£630
Typical prices: £725-£612
Finnair
Tue 8/9Tue 22/9
LHR - STL • 2 stops
Cheapest direct flights
£645
American Airlines
Tue 8/9Tue 22/9
LHR - STL • Direct
Direct flights
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 9h 05m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top airlines
Cheapest • from £630 (return)
Best reviews • 7.4 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Top stopover airports
Cheapest • Avg £141 (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 35% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
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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

Tue, 8 Sep - Tue, 22 Sep
Finnair Logo
16:10 - 23:20
LHR
-
STL
37h 10m
2 stops
Finnair Logo
12:43 - 09:05
STL
-
LHR
14h 22m
1 stop
£630Finnair
Tue, 15 Sep - Tue, 22 Sep
Finnair Logo
14:45 - 23:20
LHR
-
STL
14h 35m
1 stop
Finnair Logo
12:43 - 12:50
STL
-
LHR
18h 07m
1 stop
£634Finnair
Wed, 2 Sep - Wed, 23 Sep
KLM Logo
11:45 - 23:37
LHR
-
STL
17h 52m
2 stops
KLM Logo
19:05 - 13:15
STL
-
LHR
12h 10m
1 stop
£636KLM
Mon, 21 Sep - Thu, 5 Nov
American Airlines Logo
12:30 - 18:58
LHR
-
STL
12h 28m
1 stop
American Airlines Logo
14:17 - 06:55
STL
-
LHR
10h 38m
1 stop
£637American Airlines
Wed, 2 Sep - Wed, 23 Sep
Multiple Airlines Logo
07:50 - 18:59
LHR
-
STL
17h 09m
2 stops
Multiple Airlines Logo
17:11 - 12:50
STL
-
LHR
13h 39m
1 stop
£643Multiple Airlines
Tue, 8 Sep - Tue, 22 Sep
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
12:47 - 06:55
STL
-
LHR
12h 08m
1 stop
£645British Airways
Tue, 22 Sep - Tue, 6 Oct
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
12:52 - 06:55
STL
-
LHR
12h 03m
1 stop
£647British Airways
Tue, 22 Sep - Tue, 6 Oct
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
13:00 - 06:50
STL
-
LHR
11h 50m
1 stop
£647British Airways
Tue, 8 Sep - Tue, 22 Sep
British Airways Logo
08:55 - 16:41
LHR
-
STL
13h 46m
1 stop
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£648British Airways
Tue, 8 Sep - Tue, 22 Sep
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£649British Airways
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 September.

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 Sunday 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 £551 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is £865 and £837 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 £675 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 35% 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£397
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly and prices are also 5% lower 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 £397 for a one-way ticket and £630 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 £746 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 £668 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.
7.4
United AirlinesOverall score based on 9677 reviews
7.7Boarding
8.1Crew
7.1Entertainment
7.3Comfort
6.6Food
Airline reviews

Flew steerage class. Short on leg room unless you pay more. No window unless you pay more. Etc. United is trying to squeeze every cent from you. It doesn’t make for any loyalty.

6.0 GoodAnonymous, Apr 2026
HND - SFO
Read more United Airlines reviews

Flew steerage class. Short on leg room unless you pay more. No window unless you pay more. Etc. United is trying to squeeze every cent from you. It doesn’t make for any loyalty.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Flight crew was super friendly and helpful. Food was frequent and honestly pretty good. Plenty of on-board entertainment. Economy seats are super cramped for such a long flight, but the crew allowed people to get up and stretch, and kids could wander with their parents, so we all made it work. Overall a very good experience.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

Outstanding service, great food, friendly & efficient crew, safe & comfortable flight

Staff were not attentive, wifi did not work, cut my head in the bathroom due to the position of the soap on the sink, had blood running down my face, told staff, they had no expression no sympathy, didn't even say "sorry", they said "oh we will have a look at that" about 10 mins later the purser brought me a bandaid, still no sorry.... Shocking

Seating and zone. The minor I went with didn’t even seat close to me

My seat 3G did not go down fully and the buttons were not working properly

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Flight itself was not bad at all. However: my checked bag (checked in Calgary) did not make it onto this flight as I found out after I landed at EWR. I still don't have it but it appears that it is on its way to me.

Flight and attendance were very good we had 2 hour delay that took the shine of it

After 3 hours of delays, they ended up cancelling my flight. And although I could purchase one-way tickets to get to my destination, they would not offer me these flights as compensation for the cancelled flight, and I didn't end up making it home until 13 hours after I was originally supposed to arrive. It made for an extremely strenuous end to an otherwise good trip.

We travelled from London to Halifax. Customer service was excellent.fron the day we booked until arriving. The gate was only a short frombthe waiting area and walk Boarding was efficiently handled and plane took off on time. The service on the plane was very good. Fool an acceptable drandard Only downside was that the legroom was tight for anybody just over 6ft tall and am usually able to travel without difficulty. I will definitely fly with Air Canada again but next time pay for extr space.

Be careful about the bad policy and when purchasing seats

Very disappointed with premier lounge. Food selection very poor, both coffee machines out of order. For the price you charge for an upgrade, the seats don’t fully recline, movie selection is old. Not very good value. Asian airlines are light years ahead at a more affordable price.

The seat design in the premium economy section leaves virtually no room under the seat to store a bag or purse. Other than that, it was a great flight. Arrived early.

The flight was delayed, but not for weather. We landed over 3hrs later than planned.

The stag were helpful, kind and liked the passengers. The plane was pristinely clean! Great flight!

Was disappointed when landing in Canada was made to wait for over 1 hour with several other parents and babies for our strollers . The expectation was that the gate checked strollers would be there when exiting aircraft. This was not the case we were told to walk to a point and wait for them . After being left there and not being updated we were met with very hostile and rude air canada staff . There where no apologies or understanding even though all the children where very uncomfortable and the parents very frustrated as you can imagine . Instead the air canada staff at the airport where very rude and made an already frustrating situation much worse instead of trying to assure the parents that that were making effort to fix the situation. One gentleman in particular was very rude to some parents telling them to move when they were simply seeking information. He made the other parents including myself feel very uncomfortable. He also told a gentleman he was capturing images of everyones boarding pass when this was untrue as he was only taking a photo of the gentleman pass which was strange.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

Service was excellent. Flight was only about half full, which meant we had tons of room to stretch out. Boarding area was nice and well organized, flight attendants were super friendly and attentive and we loved the 3 snacks!

My flight was cancelled, but it was not Kayak's fault. Kayak did require me to pay for the ticket twice to two different venders who paid Lufthansa. Kayak/Lufthansa owes me for the first booking I made first was fraudulent on the part of the subcontracting ticket seller. There will be litigation over this issue under the current passenger protection laws.

flight was half full, plenty of empty seats, was able to lie down across 4 seats, food was good, arrived on time

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Our flight was completely cancelled with no options to rebook until 4 days later.

Generally good. Not their fault but the design of the Boeing 747 had seating supports directly in line with my legs. So my legs always had to straddle this support which caused body misallignment. Such poor design from Boeing. There was no USB port for me to charge my phone. The screen touch control was very poor.

I like crew. They are friendly. The flight was delayed to take off for 1hr and that caused panic at Houston Airport to catch connecting flight due to security check delay. If it has reached on time I would have sufficient time in collecting bags and security check

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

A shout-out to the flight attendent, Lauren, who was the main person assisting me. She was amazing - perfect balance of bright, cheerful, engaging, yet formal

OK, except for a cabin attendant's lack of attention.

efficient. on time. cabin crew were very professional and very nice to deal with. would definately fly BA again.

It was great overall. A few slight improvements could be made on the onboarding process at the Gates with announcements and clarity of communications (both at the gate and in flight). The movies in the entertainment options could be improved for bollywood, hollywood.

I alrady responded to this request, and expllaned at length that this was the worst flying experience in my 77 years. I will NEVER fly BA again.

Airbus A350 is poorly designed for wheelchair users and reduced mobility passengers. The angle of the pods makes it awkward to transfer. I was able to but I have ab stability. It could be a real challenge for people with more severe mobility impairments. You'd think Airbus would have come up with a solution for this or thought more about us disabled folks more when designing this aircraft.

The crew has always been great on BA. They are very friendly and accommodating. I like that they have vegetarian options already in the menu. And the free wine is a nice perk.) I noticed (both directions of my trip) minor upgrades/ replacements needed on the plane itself (touch screen didn't work with touch; bathroom light didn't go on). However, this is one of my favorite airlines.

Everything was spectacular except the boarding. It was just a mob of people while all groups were called over the public address system.

The Britts are wonderful to fly with and the crew were very hospitable. Again, I really wish they had been able to retrieve my carryon bag from baggage claim before the flight so I could be in a less worrisome state of mind, but that's not on them. I completely understand. The window seats with the dimmable windows were very cool!

There was a delay for the San Francisco-London flight, but we were all informed via text and email. The staff was very friendly and nice and the food was good. I do recommend that the airline offer something without eggs or something vegan for the vegetarian meal option. A lot of Indians are lacto-vegetarian, while some could be allergic to eggs/dairy.

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

Information on your arrival and departure airports