LHR - STL

$434 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 2/26. 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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41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$751
Typical prices: $737-$1,120
Multiple Airlines
Mon 3/2Mon 3/16
LHR - STL • 1 stop
Cheapest non-stop
$760
American Airlines
Wed 4/22Wed 4/29
LHR - STL • Non-stop
Top airlines
Delta
Cheapest • from $756 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 23% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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

Mon, Mar 2 - Mon, Mar 16
Multiple Airlines Logo
11:15 am - 11:56 pm
LHR
-
STL
18h 41m
1 stop
Multiple Airlines Logo
2:00 pm - 6:35 am
STL
-
LHR
11h 35m
1 stop
$751Multiple Airlines
Mon, Mar 2 - Mon, Mar 16
Delta Logo
6:30 am - 4:42 pm
LHR
-
STL
16h 12m
2 stops
Delta Logo
10:50 am - 8:45 am
STL
-
LHR
16h 55m
1 stop
$756Delta
Mon, Mar 16 - Mon, Mar 23
Multiple Airlines Logo
11:15 am - 11:58 pm
LHR
-
STL
17h 43m
1 stop
Multiple Airlines Logo
11:59 am - 7:00 am
STL
-
LHR
14h 01m
1 stop
$759Multiple Airlines
Mon, Mar 16 - Mon, Mar 23
Delta Logo
11:45 am - 11:58 pm
LHR
-
STL
17h 13m
2 stops
Delta Logo
6:29 am - 7:05 am
STL
-
LHR
19h 36m
1 stop
$760Delta
Mon, Apr 20 - Tue, May 5
British Airways Logo
8:55 am - 5:21 pm
LHR
-
STL
14h 26m
1 stop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$762British Airways
Mon, Apr 20 - Tue, May 5
British Airways Logo
3:15 pm - 11:48 pm
LHR
-
STL
14h 33m
1 stop
British Airways Logo
1:29 pm - 7:50 am
STL
-
LHR
12h 21m
1 stop
$765British Airways
Wed, Apr 22 - Wed, Apr 29
British Airways Logo
11:00 am - 5:12 pm
LHR
-
STL
12h 12m
1 stop
British Airways Logo
2:12 pm - 6:55 am
STL
-
LHR
10h 43m
1 stop
$766British Airways
Fri, Mar 13 - Tue, Mar 17
British Airways Logo
11:45 am - 7:30 pm
LHR
-
STL
12h 45m
1 stop
British Airways Logo
2:00 pm - 7:50 am
STL
-
LHR
12h 50m
1 stop
$769British Airways
Mon, Apr 20 - Tue, May 5
Delta Logo
8:40 am - 8:42 pm
LHR
-
STL
18h 02m
2 stops
Delta Logo
1:02 pm - 10:20 am
STL
-
LHR
15h 18m
2 stops
$774Delta
Sun, Mar 15 - Sun, Mar 22
Virgin Atlantic Logo
10:45 am - 11:58 pm
LHR
-
STL
18h 13m
1 stop
Virgin Atlantic Logo
6:59 pm - 7:50 am
STL
-
LHR
31h 51m
1 stop
$780Virgin Atlantic
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 March.

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 $755 (return) on average. On the other hand, the most expensive months are August and July, where the average cost of round-trip tickets is $1,146 and $1,107 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, which saves you about 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know

Low seasonOctober
Cheapest flight$444
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly with an average 13% 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 $444 for a one-way ticket and $751 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?

    Star Alliance, and oneworld 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 British Airways?

    The two airlines most popular with KAYAK users for flights from London to St. Louis are United Airlines and British Airways. With an average price for the route of $1,162 and an overall rating of 7.4, United Airlines is the most popular choice. British Airways is also a great choice for the route, with an average price of $874 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 $446 or less one-way and $803 or less round-trip.

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.
7.4
United AirlinesOverall score based on 9214 reviews
7.7Boarding
7.1Entertainment
6.6Food
7.3Comfort
8.1Crew
Airline reviews

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

2.0 MediocreJames, Jan 2026
ORD - MSP
Read more United Airlines reviews

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

This Japanese airline provides great service and very helpful in assisting their passengers.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

I so appreciate the crew members on each flight of United. They are outstanding.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

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.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

I was in a bulkhead seat and my tray table wasn't level. Eating was difficult.

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

Information on your arrival and departure airports