LHR - STL

$488 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 9/6. 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, 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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Everything you should know

Cheapest round-trip
$1,035
Typical prices: $1,562-$1,136
British Airways
Tue 7/7Tue 7/21
LHR - STL • 1 stop
Cheapest non-stop
$1,046
British Airways
Wed 9/16Wed 9/23
LHR - STL • Non-stop
Nonstop flights
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 9h 05m
Direct flights
Direct flights
+1
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Direct flights
Direct flights
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Top airlines
Cheapest • from $1,035 (round-trip)
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
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Top layover airports
Cheapest • Avg $1,180 (round-trip)
Shortest trip • 12h 53m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 35% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 26% 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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Start a new search
KAYAK searches 100s 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 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 for you by selecting your travel dates on KAYAK.

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

Tue, Jul 7 - Tue, Jul 21
British Airways Logo
8:55 am - 4:28 pm
LHR
-
STL
13h 33m
1 stop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$1,035British Airways
Tue, Jun 30 - Sat, Jul 4
Iberia Logo
10:05 am - 9:09 am
LHR
-
STL
29h 04m
1 stop
Iberia Logo
8:06 pm - 8:05 am
STL
-
LHR
29h 59m
1 stop
$1,038Iberia
Tue, Jul 14 - Tue, Jul 21
British Airways Logo
3:00 pm - 11:58 pm
LHR
-
STL
14h 58m
1 stop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$1,040British Airways
Wed, Sep 16 - Wed, Sep 23
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$1,046British Airways
Fri, Jul 10 - Fri, Jul 24
Air Canada Logo
8:40 am - 6:42 pm
LHR
-
STL
16h 02m
2 stops
Air Canada Logo
8:55 am - 6:30 am
STL
-
LHR
15h 35m
2 stops
$1,047Air Canada
Wed, Aug 26 - Thu, Sep 3
Delta Logo
6:30 am - 4:17 pm
LHR
-
STL
15h 47m
2 stops
Delta Logo
2:10 pm - 10:30 am
STL
-
LHR
14h 20m
2 stops
$1,049Delta
Mon, Jul 13 - Mon, Jul 20
Delta Logo
12:50 pm - 11:53 pm
LHR
-
STL
17h 03m
2 stops
Delta Logo
1:22 pm - 8:50 am
STL
-
LHR
13h 28m
2 stops
$1,055Delta
Sat, Jun 27 - Mon, Jul 6
Iberia Logo
6:05 pm - 9:09 am
LHR
-
STL
45h 04m
2 stops
Iberia Logo
7:56 pm - 8:00 am
STL
-
LHR
30h 04m
2 stops
$1,056Iberia
Mon, Jul 20 - Mon, Jul 27
Finnair Logo
2:45 pm - 12:16 am
LHR
-
STL
15h 31m
1 stop
Finnair Logo
5:58 pm - 12:15 pm
STL
-
LHR
12h 17m
1 stop
$1,058Finnair
Sat, Jul 11 - Sat, Jul 18
Multiple Airlines Logo
9:30 am - 8:07 pm
LHR
-
STL
16h 37m
2 stops
Multiple Airlines Logo
12:10 pm - 11:50 am
STL
-
LHR
17h 40m
2 stops
$1,059Multiple 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 round-trip flight from London Heathrow Airport to St. Louis?

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

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 $745 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $1,274 and $1,159 respectively.

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

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $1,243, prices are generally cheapest when you fly direct.

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 3 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

Low seasonJanuary
Cheapest flight$488
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly and prices are also 6% 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 5 days, the lowest price for a flight from London Heathrow Airport to St. Louis was $488 for a one-way ticket and $1,035 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?

    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?

    oneworld is the only airline alliance operating flights between London Heathrow Airport and St. Louis.

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

    You can catch a nonstop 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, American Airlines or British Airways?

    The two airlines most popular with KAYAK users for flights from London to St. Louis are American Airlines and British Airways. With an average price for the route of $1,143 and an overall rating of 7.1, American Airlines is the most popular choice. British Airways is also a great choice for the route, with an average price of $964 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.

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

  • Looking for a cheap flight? 25% of our users found flights on this route for $1,090 or less one-way and $1,295 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 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.
7.1
American AirlinesOverall score based on 11660 reviews
7.9Crew
6.8Entertainment
6.4Food
7.5Boarding
7.2Comfort
Airline reviews

Crew was nice, aircraft dated, entertainment same. Internet is expensive and terribly slow. Food pretty bad

6.0 GoodSebastian, Jun 2026
LHR - CLT
Read more American Airlines reviews

Crew was nice, aircraft dated, entertainment same. Internet is expensive and terribly slow. Food pretty bad

Horrible experience. Food was ridiculous, insufficient, and not appetizing at all. They served sugary granola bar for breakfast. Furthermore, my bags were delayed and delivered damaged and American made it impossible to file for damages. Furthermore, the flights were delayed causing unnecessary stress given the connecting flights. It was awful experience, would never want to fly American.

My table was broken so it made it difficult to eat the food during the service. I was also informed that my luggage did not make it with me to Phoenix. I live two hours away so this makes it even more stressful to try and arrange a time for pick up

Part of my stress and frustration was 50% with the TSA security. However. It is nearly impossible, if you are flying long-range and carrying luggage, to get through security and to the Gate before it closes. I was scheduled to fly out at approximately 12 and got hung up at TSA from 11:00-11:20. When I looked at the screen, the gate was already closing. I have to run to gate 24. Barely made it - all that to say you might consider lengthening the connection time by at least 30 mins.

Very hard to beat a British Airways international flight…the crews are always so amazing! One flight attendant that really stood out was Emma…she was very personable and accommodating with any request we had!!

The passport line was so long that many of us were concerned about missing our flight and some did. It would've helped if a AA representative had gone to the passport check-in sooner to advise that boarding was closing and those flying that were stuck back in the line, needed to come forward with apologies to others. An AA representative did do that but only after boarding had already closed. (They delayed take-off so that more who were running with carry-ons could get to the gate - especially stressful for older people!) Then to be crammed into a seat with barely enough leg room for a thin woman, 5'7", like me, much less for a taller, bigger person was not comfortable, especially if the person in front decided to lean back. Crew was fine, food and entertainment also.

The seat when "flat" was not flat and pad was too thin to cover it.

Awful customer service, horrible experience. We travel a lot domestic & international- worst flights to/from ever. Brief bkgd as Inhate to relive this experience: booked and chose 2 seats 4 months prior in Premium Economy - last row end seats close to bathroom, no one behind us, plenty of legroom;, underwear storage — flown this was on other airlines, love it. We receive notice 4 days before scheduled overseas flight - plane has changed, new seats assigned. Seats are split into single seats, opposites of the plane, FRONT Row so no reachable storage. Called BOTH British Air & America. American “switched planes and the seats you want are taken;” British Air “Yes, we’ll be glad to accommodate you (type type type). Just ask at the Gate and someone will give you new boarding passes with seats together in middle, OK?” — OK. —At Gate the attendant looks us up saying “No, it is an overbooked flight and yours are the only seats available.” But but but wait, “We were TOLD our seats had been switched and seated together?” Gate attendant “Well they were wrong and don’t change your seats. Your original seats are where you’ll sit.”. Right. No help WHATSOEVER. We sit opposite on way there, wife VERY disgruntled, a Tol 5 worst ways to start a 3-week bus tour of UK. We promise to NEVER FLY AMERICAN OR BROTISH AIR EVER, and we have 3 more extensive trips planned..

They lost my bag. ... And I asked them 3 times to 3 different people if my checked bag will maKe it all the way - they all confirmed and at the end it was left at the connection... Bravo

We called Kayak for a change due to the TSA situation in Atlanta. What we got was a canceled return flight (in error) and we had to find the mistake. Not happy with Kayak who blamed it on AA.

Seats not as comfortable as I had hoped. Food was very nice, service was fine. Entertainment options very nice. Had thought the premium economy was a more plus 2-3-2 layout but it was a 2-4-2 with seats not as wide as I had expected.

I flew four flights on British Airways within two weeks. I was unable to download the boarding pass to my phone for any of the four flights. I could check-in for my flight but the system would not give me boarding pass. I tried multiple ways and multiple times. I discovered many other passengers also had the same issue with their boarding passes. No explanation or acknowledgement by BA.

Lovely big plane. Excellent take off and landing. Cabin crew were so nice. Flight in time no delays

Because our ABZ-LHR flight was cancelled by BA for reasons they refuse to tell us--not weather--we did not make this flight and were booked on the following day. BA offered no assistance to us on the phone or in the airport, and we had to find a hotel at Heathrow on our own.

Horrible - flight was delayed by 6 hours - we boarded, were made to de-board due some technical fault; aircraft changed; special meals request on new flight - all went awry. Landed in Dulles airport; breezed thru immigration; as Business Class passengers or baggage was delivered almost 90 minutes after landing; air tags indicated the bags were just near the carousel but the unhelpful BA staff - Maria and Ghina refused to give any update - palming it off on some imaginary invisible “manager” despite air tags evidence showing it right there. So about 50-60 passengers waiting and getting infuriatingly impatient for their bags coz one container was not delivered. Finally after much argument by some other passengers Maria condescended to go to the “ramp” and within 5 minutes the baggage was delivered miraculously. Question is why couldn’t she have done it one hour earlier ? Poor poor experience once again on Business Class BA.

Cheap Flight Fares would not provide booking info. I canceled the reservation and we arbitrated with American Express. They provided erroneous info to Amex and it was determined that C.F.F. deserved the price of the ticket. Worse experience I've ever had.

Seating space is appalling. Seats and all surrounding area in "Economy" is built for individuals shorter than 4' 10" and below 120 lbs. Ridiculous. While I'm not expecting fine dining, the food was the worst airplane food that I can recall.

Business class lounge for my gate was closed and no email was sent, causing me to walk back and forth to different gates, etc for over 20 minutes one way. Flight entertainment was mediocre with very poor choices especially for business class cabin. Original flight was cancelled and rebooking was difficult and no reason given for cancellation.

Very comfortable flight and simple and directed one way and back. Amazing price.

We loved our flight attendant, Emma from Scotland, the meal and entertainment offerings were wonderful, the flight was smooth, and enough leg room to stretch. We would fly with you again!

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

Information on your arrival and departure airports