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LHR - STL

$367 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 5/18. 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
0 bags
Tue 6/4
Tue 6/11

Search 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, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to St. Louis, as well as popular online travel agencies
In the last 7 days travelers have searched 43,369,418 times on KAYAK, and here is why:

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

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip 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 and deals for you by selecting your travel dates.
Choose your dates
2:10 pm - 11:00 pmLHR-STL
14h 50m1 stop
2:38 pm - 9:05 amSTL-LHR
12h 27m1 stop
$639Finnair
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Mon, Sep 16 - Mon, Sep 30
11:15 am - 11:17 pmLHR-STL
18h 02m1 stop
10:46 am - 7:30 amSTL-LHR
14h 44m1 stop
$661Finnair
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Wed, May 15 - Thu, May 30
6:50 am - 3:46 pmLHR-STL
14h 56m2 stops
6:08 am - 6:30 amSTL-LHR
18h 22m2 stops
$932United Airlines
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Wed, May 15 - Thu, May 30
6:50 am - 3:46 pmLHR-STL
14h 56m2 stops
5:31 pm - 5:55 amSTL-LHR
30h 24m1 stop
$970United Airlines
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Wed, May 15 - Fri, May 24
1:05 pm - 12:31 pmLHR-STL
29h 26m1 stop
4:20 pm - 12:10 pmSTL-LHR
13h 50m1 stop
$1,000American Airlines
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Wed, May 15 - Fri, May 24
2:45 pm - 9:47 pmLHR-STL
13h 02m1 stop
3:27 pm - 12:10 pmSTL-LHR
14h 43m1 stop
$1,037American Airlines
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Mon, May 27 - Wed, Jun 5
2:25 pm - 10:02 pmLHR-STL
13h 37m1 stop
6:00 am - 10:10 pmSTL-LHR
10h 10m1 stop
$1,114British Airways
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Sat, Jun 15 - Sat, Jun 22
10:05 am - 5:19 pmLHR-STL
13h 14m1 stop
6:18 pm - 10:20 amSTL-LHR
10h 02m1 stop
$1,308British Airways
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Mon, Jul 8 - Wed, Aug 7
3:20 pm - 9:37 pmLHR-STL
12h 17m1 stop
12:55 pm - 5:55 amSTL-LHR
11h 00m1 stop
$2,032Lufthansa
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Tue, Aug 13 - Tue, Aug 20
3:30 pm - 1:30 pmLHR-STL
28h 00m1 stop
8:25 am - 7:40 amSTL-LHR
17h 15m2 stops
$5,282Lufthansa
Find Deal
Tue, Aug 13 - Thu, Aug 22

Flights from Heathrow to St. Louis - Travel Insights & Trends

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.

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

The average price of all flights from London Heathrow Airport to St. Louis clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from London Heathrow Airport to St. Louis, look for departures on Saturdays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from St. Louis, Wednesday is the cheapest day to fly and Sunday is 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 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 $637 on average. On the other hand, the most expensive months are August and July, where the average cost of tickets is $970 and $896 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from London Heathrow Airport to St. Louis, you should book around 1 day before departure. For the absolute cheapest price, our data suggests you should book 27 days before departure.

Which airlines provide the cheapest flights from London Heathrow Airport to St. Louis?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The cheapest return flight ticket from London Heathrow Airport to St. Louis found by KAYAK users in the last 72 hours was for $639 on Finnair, followed by Delta ($871). One-way flight deals have also been found from as low as $679 on WestJet and from $791 on Finnair.

Good to know

Low season

February

High season

May

Cheapest flight

$367
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly and prices are also 3% 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 round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 $367 for a one-way ticket and $639 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and St. Louis?

    Yes

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

    When flying out of London Heathrow Airport you will be using London Heathrow. You will be landing at St. Louis, also known as Lambert-St Louis.

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

    We unfortunately don’t have that data for this specific route.

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

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

  • Which is the best airline for flights from London to St. Louis, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from London to St. Louis are United Airlines and American Airlines. With an average price for the route of $1,108 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $1,287 and an overall rating of 7.3.

  • 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 travelers 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 round-trip ticket. You could then fly to St. Louis with an airline and back to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and STL can sometimes prove cheaper using this method.

  • 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.

See more FAQs

Top 4 airlines serving 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 11118 reviews
7.2Comfort
7.7Boarding
7.1Entertainment
6.7Food
8.1Crew
Airline reviews

It was fine. Flight was on time and arrived at destination with 15 min to spare.

8.0 ExcellentAnonymous, May 2024MUC - EWR
Read more about United Airlines reviews

It was fine. Flight was on time and arrived at destination with 15 min to spare.

My bag was lost with my medicine and I am very inconvenienced. I don’t know what happened, however I want you to do a better job on getting people’s bag back

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The food that was offered based on class level of your ticket was absolutely ridiculous and disgusting. They didn't even hot tea to serve, the food was horrible. On our departure flight I was seated in premium plus economy and considering the cost of the flight the food was literally some of the worst I've ever eaten. On the return flight I sat in economy with extra leg room and was given a thin little throw "blanket" and a flimsy little pillow. The air condition was on artic and the seating arrangement wasn't really worth the money. The seat didn't recline good enough and the foot rest was laughable. Total waste.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the room where it was being kept.

The flight was delayed due to weather issue…WiFi did not work and even though I wanted to pay for WiFi I couldn’t buy it. Overall very disappointing even though I paid and reserved Business class

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

All flights were on time and boarding was issue free

Seriously, not displaying departure gate until very last minute is awful. Specially when you have to take an elevator and then transport to go to the sub-terminal. That’s awful in such a busy airport as Heathrow. And I cannot choose seat on this flight because it’s run by British Airways, even entering locator code.

Somehow I got “offloaded” even though I had my boarding pass and was in transit Food is horrible Staff were nice and cheerful No headphones were provided on 11 hours flight

The staff were very helpful with lots of refreshments on offer. The toilets were clean. The seats were comfortable and entertainment was good. No complaints, it was excellent.

The main flight was OK but the second flight was chaotic with delays

amazing! they were so kind and allowed us to sit on empty seats so we could stretch our legs and sleep good. Food is amazing as well plus dessert in the middle of the flight!

All the British airways staff were very helpful and friendly. Every thing was very smooth running from checking in boarding and arriving 40 minutes early. Which is a brilliant start to your holiday.

Overall it was good but not great. The aircraft was an old and seats didn’t recline in business class unless you kept playing around with it.

No nice at all, delayed and I lost the connection over xmas

Food was terrible. Flight attendants OK. Only saw them at food service. Other than that they paid no attention to the passengers at all.

On time flight , great service from crew , comfortable and enjoyable

It was freezing in the airplane. Everyone was wearing everything they had with them. The crew acknowledged it was cold, but did nothing about it

The flight attendants were superb and the service was outstanding. Some passengers with small children were very rude and inconsiderate, kids were constantly crying and some were running around the aisle unsupervised.

Terrible. There was a rattling noise the whole flight. The internet didn't work after I paid. Boarding is very disorganized.

Horrible flight attendant in back of economy that screamed at me, have already reported to United. Horrible food - for Gluten free, why would you assume the person is vegetarian? I was served some kind of horrible curry bean paste and multiple cold rolls and soggy vegetables with no seasoning... um no!

The crew member put her luggage and boxes behind my seat so I was able to recline while the passenger in front of me did for 8 hours. My knees were forced against the seat for hours :(. Dude sitting next to me hasn't showered in weeks so I almost threw up.

Sorry my last review for prg to fra was for this flight. My prg to fra flight was fine but my second flight back to Washington DC was with a slow awful crew who wouldn’t come in a timely manner to take trash and take trash before serving coffee tea and was shoving other people’s bottles of water on me when we were not traveling together

I was at the airport on time , I checked in my luggage . The plane was delayed and the gate was change. The flight board did not give information . I did not get chance to fly. I am going to make a claim for it

Lufthansa was amazing. Definitely upgrade your seat if you can swing it - they take very good care of their passengers. Customs in DC is nothing short of a nightmare though. Stood in line waiting to go back through security for 30 minutes, had to RUN through and across two terminals to make my connection and only had 5 minutes to spare. Terrible. Very very poor coordination by the airport staff and CBP.

I was ver pleased with the service all the way through

I always try to book flights that don’t charge for baggage. Yet I was charged $75 for this flight.

my original flight was cancelled the previous day, and i was rescheduled onto this flight, which left much earlier in the morning, impacting my previous evening and requiring me to get up much earlier in the morning to get to the airport online. This practice happens way way way too much, and it seems on every airline, though AA is probably the worst.

The crew was very attentive and kept busy serving a variety of treats!

Offered vegetable curry when it was actually tofu which I don’t care for.

The flight was good the crew excellent…but take off delayed three hours!!!

Both mine and my husband's chairs were broken. Also it took 2 hours to get our bags after our flight which was wild.

perhaps eye contact with the cabin crew, instead of abruptness and an impatience to serve.

Not enough trash pickups throughout the flight. Everything else was great.

Overall good, the gluten free food is very hit/miss though and you must tell them you have an allergy days in advance.

All was good. The headphones they supply are of poor quality. The food is good but too much dairy.

Seating space was crowded and I am a very small woman.

Book cheap flights from London to St. Louis

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from London to St. Louis found on KAYAK in the last 72 hours.
5/18Sat
3 stops
43h 23mLHR-STL
$367
5/15Wed
3 stops
33h 44mLHR-STL
$497
5/12Sun
2 stops
49h 59mLHR-STL
$515
5/12Sun
3 stops
31h 04mLHR-STL
$603
5/15Wed
2 stopsWestJet
30h 05mLHR-STL
$679
5/15Wed
1 stopLufthansa
13h 00mLHR-STL
$924
7/13Sat
2 stopsWestJet
37h 26mLHR-STL
$1,154
5/12Sun
1 stopBritish Airways
12h 36mLHR-STL
$1,194
5/15Wed
1 stopAmerican Airlines
19h 00mLHR-STL
$2,674
5/15Wed
1 stopAmerican Airlines
19h 00mLHR-STL
$2,679

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Last minute flights from Heathrow to St. Louis

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from London to St. Louis that are departing in the next 10 days.
5/8Wed
multi-stopFinnair
18h 02mLHR-STL
5/18Sat
multi-stopFinnair
16h 19mSTL-LHR
$671
5/9Thu
multi-stopFinnair
15h 09mLHR-STL
5/18Sat
multi-stopFinnair
14h 44mSTL-LHR
$716
5/8Wed
multi-stopFinnair
12h 25mLHR-STL
5/18Sat
multi-stopFinnair
14h 39mSTL-LHR
$957
5/9Thu
multi-stopFinnair
14h 42mLHR-STL
5/18Sat
multi-stopFinnair
14h 39mSTL-LHR
$993
5/6Mon
multi-stopVirgin Atlantic
14h 28mLHR-STL
5/16Thu
multi-stopVirgin Atlantic
10h 23mSTL-LHR
$1,423
5/6Mon
multi-stopUnited Airlines
15h 49mLHR-STL
5/16Thu
multi-stopUnited Airlines
15h 10mSTL-LHR
$1,437
5/6Mon
multi-stopUnited Airlines
13h 53mLHR-STL
5/16Thu
multi-stopUnited Airlines
14h 30mSTL-LHR
$1,447
5/8Wed
multi-stop
17h 14mLHR-STL
5/18Sat
multi-stop
13h 25mSTL-LHR
$1,465
5/8Wed
multi-stop
17h 14mLHR-STL
5/18Sat
multi-stop
14h 40mSTL-LHR
$1,471
5/9Thu
multi-stopLufthansa
15h 16mLHR-STL
5/18Sat
multi-stopLufthansa
13h 25mSTL-LHR
$1,503

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London Heathrow Airport - St. Louis Flights

Departure:

London Heathrow Airport (LHR)United Kingdom

Destination:

St. Louis (STL)United States

Return flight deals:

St. Louis - London Heathrow Airport

Cabin classes: