LHR - STL

$564 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 6/23. 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.
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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, 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
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Flights Deals

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.

Recent round-trip flight deals from Heathrow to St. Louis

KAYAK's recommended round-trip deals from the most popular airlines that fly from Heathrow to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
Iberia Logo
1:30 pm - 8:58 pmLHR-STL
13h 28m1 stop
Iberia Logo
9:10 am - 7:50 amSTL-LHR
16h 40m1 stop
$899Iberia
Find Deal
Wed, May 28 - Wed, Jun 4
British Airways Logo
6:30 am - 8:21 pmLHR-STL
19h 51m2 stops
British Airways Logo
8:01 pm - 12:15 pmSTL-LHR
10h 14m1 stop
$904British Airways
Find Deal
Wed, Sep 3 - Wed, Sep 10
 Logo
2:30 pm - 9:15 amLHR-STL
24h 45m2 stops
 Logo
10:10 am - 11:55 amSTL-LHR
19h 45m2 stops
Wed, May 14 - Sun, May 18
Scandinavian Airlines Logo
6:40 am - 11:39 pmLHR-STL
22h 59m2 stops
Scandinavian Airlines Logo
1:30 pm - 4:00 pmSTL-LHR
20h 30m2 stops
$916Scandinavian Airlines
Find Deal
Wed, Sep 3 - Wed, Sep 24
Lufthansa Logo
8:30 am - 10:34 amLHR-STL
32h 04m2 stops
Lufthansa Logo
12:28 pm - 8:20 amSTL-LHR
13h 52m1 stop
$923Lufthansa
Find Deal
Sat, Oct 4 - Wed, Oct 22
 Logo
10:30 am - 7:58 pmLHR-STL
15h 28m2 stops
 Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
Wed, May 14 - Sun, May 18
Lufthansa Logo
12:05 pm - 7:43 pmLHR-STL
13h 38m1 stop
Lufthansa Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
$984Lufthansa
Find Deal
Thu, May 15 - Sun, May 18
Scandinavian Airlines Logo
6:40 am - 11:39 pmLHR-STL
22h 59m2 stops
Scandinavian Airlines Logo
1:30 pm - 6:30 pmSTL-LHR
23h 00m2 stops
$1,025Scandinavian Airlines
Find Deal
Wed, Sep 3 - Wed, Sep 10
United Airlines Logo
6:50 am - 3:47 pmLHR-STL
14h 57m2 stops
United Airlines Logo
8:10 am - 5:55 amSTL-LHR
15h 45m2 stops
$1,078United Airlines
Find Deal
Sat, May 10 - Wed, May 28
United Airlines Logo
6:30 am - 1:30 pmLHR-STL
13h 00m1 stop
United Airlines Logo
10:00 am - 11:45 amSTL-LHR
19h 45m1 stop
$1,148United Airlines
Find Deal
Wed, Jun 4 - Fri, Jun 27
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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.

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.

When flying from London Heathrow Airport to St. Louis, you should consider leaving on a Thursday and avoid Saturdays if you are looking for the best rates. For your return to London Heathrow Airport, you’ll find the best rates on Thursdays and the most expensive ones on Fridays.

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 $811 (return) on average. On the other hand, the most expensive months are August and December, where the average cost of round-trip tickets is $1,202 and $1,151 respectively.

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 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know

Low seasonMarch
High seasonJuly
Cheapest flight$564
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 9% increase in price.
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 $564 for a one-way ticket and $899 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 SkyTeam being the most commonly used for this route.

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

    The two airlines most popular with KAYAK users for flights from London to St. Louis are United Airlines and Lufthansa. With an average price for the route of $1,263 and an overall rating of 7.4, United Airlines is the most popular choice. Lufthansa is also a great choice for the route, with an average price of $928 and an overall rating of 6.7.

  • 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.

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 8696 reviews
7.1Entertainment
8.1Crew
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

2.0 MediocreBrant, Apr 2025YHZ - EWR
Read more United Airlines reviews

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

A bit rush for transit. Food and entertainment are not available

So far so good but food and entertainment are not available for this flight

Multiple delays and not straight answer from the United team

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

Smooth boarding process. Early departure, smooth flight, early arrival. The entertainment package has very good recent movie options. The flight crew were friendly and professional.

Paid $35 and not able to access the internet at all.

Several delays. Next flight was worse. Did not arrive home until 2am PT

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

Good crew and a great experience. Only good things to say.

Improvements in communication and empathy are absolutely necessary for American Airlines staff (top down). It’s like they are numb to the needs of their customers.

Great thanks - a whole row to myself. Good food but film selection not great.

It is okay. Flight was on time to start and early to land

I had a TERRIBLE experience with the AA crew. I believe it was disability-related. It’s unlikely I will fly AA again.

Fantastic. I am low vision and was impressed with how helpful and accommodating the service tam was. It was super appreciated! I was pleasantly surprised about how delicious the food was. Like, “I wish I had more even though I’m no longer hungry” delicious. 100% enjoyable trip.

The flight was delayed by an hour. Made the connection uncomfortably tight.

The plane was very clean. The bathroom was clean as well. The land crew were very polite and informative and helpful. They informed me that there is a long way and challenging to go from international terminal to national terminal and in addition to getting my suitcases and going through customs and dropping them again for my second leg of trip which was San Francisco to Los Angeles . I have left knee issue and had a recent fall with aching muscles all over, the land crew suggested wheelchair help for me, God bless her. If I did not have help, I could not make it to my last terminal. Thank you UNITED AIRLINE!

I like the service and the efficiency. I am lactose intolerant and the lactose intolerant meal in business class was not astounding. Also, the business class fully reclining seats are not that comfortable.

Food was great but they didn't clear my meal tray for 3 hours. You'd think they could check though the cabin now and then.

Upon arriving at IAH, it was informed that the luggage had not arrived. Still waiting to hear back when it will be delivered.

I wasn’t allowed to board with my children. I was charged outrageous costs for basic carry on size luggage. The entertainment screens were outdated and not user friendly.

I was very happy with everything, thank you for the smooth flight ✈️

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

I enjoyed my flight back with Lufthansa because the food was good, and the flight attendants were nice and helped you when you asked a question. The flight attendants always came around and asked if you needed anything which I liked a lot.

Entertainment system is old. Food can be tastier Need to provide toothbrush and toothpaste at least when asked.

Boarding is a mess. They never check group # so lots of people crowding in. Comfortable seats this flight. I had an empty seat next to me, very convenient. Food was really not good, but I was starved. The pizza snack thing was horrible. Crew was grand. They really make it enjoyable.

Crew very helpful and friendly. Food is so so. Main meal is not always the best. Did have a choice of a snack part way which was either a cookie, corn snack, or similar. Second kind of meal was basically like a pizza pastry that really wasn’t a favorite but probably a European snack? Screens and selections of movies, tv and such were good. No WI-Fi unless you buy so no free texting or such on the long flight but I think that might be any overseas flight.

Flight Attendant Karen Lynn was an absolute delight. She assisted in every portion of the services provided throughout the flight, aided with any and all concerns expressed by passengers, and even helped comfort an upset child who was one of five of a traveling family. This quality of service is what keeps me coming back to American. Thank you!

The worst, flight cancelled because the aircraft was not full. Heathrow ground crew totally not helpful and arrogant. Lady proposed us flight with 40min layover instead of direct and said it is our problem of course she was unable to do anything as everything was beyond her control she claimed. after calling on hotline another flight was booked. Flight was cancelled last second so we could not take direct from Zurich but we had to stay overnight in London.

Food was terrible , crew were excellent , IFE was dire . Overall comfortable seat and cabin. Nothing special .

If my tv wasn’t broken and I wasn’t in a seat that didn’t allow for sleeping

Delayed flight due to lack of crew caused me to miss my connection

Please make sure the number of seats matches the number of overhead bins and passengers don't carry on more than one bag.

Seating is tight if you don’t upgrade. Food was decent. Boarding and unboarding was efficient. Smooth flight. Could make upgrades more affordable

American Airlines seemed to run a 'dry' flight. No alcohol was offered at any point with meals. Breakfast was a bit tasteless. The 'hot pocket' whatever that is, was horrid breadish pastry with very little filling. Decaf coffee was horrid. Seats didn't seem as wide or spacious as usual, especually for a ten hour flight.

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

Information on your arrival and departure airports

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