Cheap flights from London Heathrow Airport to St. Louis from £366
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
7 Sep — 14 Sep1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or September, booked 71 days in advance, depart on a Friday or Thursday and return on a Wednesday
Cheap flight deals from Heathrow to St. Louis
Enter your travel dates to find the best prices.
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Cheapest flights from Heathrow to St. Louis
Explore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 August 2026.
Wed 30/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 7/8£602
Wed 28/1006:40 -
2 stops22h 14m
Sun 1/1112:00 -
2 stops24h 30m
Deal found 4/8£610
Tue 1/906:30 -
1 stop12h 55m
Tue 8/912:28 -
1 stop14h 52m
Deal found 3/8£612
Wed 2/908:40 -
2 stops16h 02m
Wed 23/912:10 -
1 stop12h 20m
Deal found 4/8£612
Mon 7/906:30 -
1 stop12h 55m
Tue 15/918:53 -
1 stop11h 02m
Deal found 5/8£614
Wed 2/916:25 -
Nonstop9h 05m
Wed 30/912:46 -
1 stop18h 04m
Deal found 4/8£615
Wed 2/910:05 -
1 stop16h 21m
Fri 11/917:18 -
1 stop11h 32m
Deal found 4/8£616
Wed 9/908:40 -
2 stops16h 01m
Wed 23/912:10 -
1 stop15h 50m
Deal found 7/8£618
Wed 23/909:45 -
1 stop16h 59m
Fri 2/1012:46 -
1 stop14h 19m
Deal found 3/8£618
Wed 28/1006:30 -
1 stop13h 15m
Tue 3/1113:08 -
2 stops15h 37m
Deal found 4/8£619
Best flights from Heathrow to St. Louis
Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 August 2026.
Wed 30/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 7/8£602
Mon 7/919:30 -
1 stop23h 55m
Mon 14/912:59 -
1 stop11h 46m
Deal found 7/8£615
Mon 7/920:05 -
2 stops25h 39m
Mon 14/912:28 -
1 stop11h 27m
Deal found 7/8£622
Wed 30/909:45 -
1 stop13h 03m
Sat 3/1017:18 -
1 stop32h 22m
Deal found 7/8£707
Thu 3/907:30 -
2 stops17h 46m
Sun 13/908:20 -
2 stops43h 40m
Deal found 7/8£737
Tue 15/1209:40 -
2 stops17h 53m
Tue 29/1211:51 -
2 stops13h 29m
Deal found 4/8£795
Sun 1/1106:40 -
2 stops23h 14m
Wed 11/1112:20 -
2 stops27h 20m
Deal found 6/8£626
Fri 4/916:25 -
Nonstop9h 05m
Sun 20/917:18 -
1 stop11h 32m
Deal found 7/8£732
Wed 14/1009:30 -
1 stop15h 11m
Mon 26/1017:00 -
1 stop12h 25m
Deal found 3/8£779
Tue 25/808:45 -
2 stops16h 31m
Fri 25/911:35 -
2 stops13h 20m
Deal found 4/8£789
Wed 28/1012:15 -
2 stops15h 10m
Tue 3/1111:00 -
3 stops17h 50m
Deal found 3/8£792
Direct flights from Heathrow to St. Louis
Explore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 August 2026.
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 4/8£627
Wed 2/916:25 -
Nonstop9h 05m
Wed 30/921:35 -
Nonstop8h 00m
Deal found 4/8£651
Tue 1/916:25 -
Nonstop9h 05m
Tue 8/921:35 -
Nonstop8h 00m
Deal found 3/8£652
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 5/8£662
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 6/8£681
Wed 2/916:25 -
Nonstop9h 05m
Wed 30/921:35 -
Nonstop8h 00m
Deal found 4/8£713
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 5/8£727
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 8 August 2026 and is based on user searches.
Tue 1/906:30 -
1 stop12h 55m
Tue 8/912:28 -
1 stop14h 52m
Deal found 3/8£612
Wed 2/908:40 -
2 stops16h 02m
Wed 23/912:10 -
1 stop12h 20m
Deal found 4/8£612
Wed 2/916:25 -
Nonstop9h 05m
Wed 30/912:46 -
1 stop18h 04m
Deal found 4/8£615
Wed 2/910:05 -
1 stop16h 21m
Fri 11/917:18 -
1 stop11h 32m
Deal found 4/8£616
Mon 7/906:30 -
1 stop12h 55m
Tue 15/918:53 -
1 stop11h 02m
Deal found 5/8£614
Wed 9/908:40 -
2 stops16h 01m
Wed 23/912:10 -
1 stop15h 50m
Deal found 7/8£618
Wed 23/909:45 -
1 stop16h 59m
Fri 2/1012:46 -
1 stop14h 19m
Deal found 3/8£618
Wed 30/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 7/8£602
One-way flights from Heathrow to St. Louis
Search for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated 8 August 2026.
Tue 3/1112:15 -
3 stops51h 25m
Deal found 5/8£366
Tue 10/1112:15 -
3 stops51h 25m
Deal found 8/8£367
Wed 4/1112:15 -
3 stops51h 25m
Deal found 7/8£373
Tue 17/1112:15 -
3 stops51h 25m
Deal found 7/8£379
Tue 13/1013:05 -
3 stops50h 35m
Deal found 5/8£384
Tue 27/1020:35 -
3 stops42h 05m
Deal found 5/8£387
Wed 7/1013:05 -
3 stops26h 35m
Deal found 6/8£390
Fri 4/915:00 -
3 stops56h 22m
Deal found 5/8£391
Find flight deals from Heathrow to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 8 August 2026.
Customise your flight search to find flights from Heathrow to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 8 August 2026.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest return flight
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 30/9
17:00-23:42
2 stops36h 42m
Lambert-St Louis
Sat 3/10
15:54-16:00
2 stops18h 06m
£602
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 7/9
19:30-13:25
1 stop23h 55m
Lambert-St Louis
Mon 14/9
12:59-06:45
1 stop11h 46m
£615
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 7/9
20:05-15:44
2 stops25h 39m
Lambert-St Louis
Mon 14/9
12:28-05:55
1 stop11h 27m
£622
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Sun 1/11
06:40-00:54
2 stops23h 14m
Lambert-St Louis
Wed 11/11
12:20-21:40
2 stops27h 20m
£626
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 30/9
09:45-16:48
1 stop13h 03m
Lambert-St Louis
Sat 3/10
17:18-07:40
1 stop32h 22m
£707
Fastest return journey
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Fri 4/9
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Sun 20/9
17:18-10:50
1 stop11h 32m
£732
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 3/9
07:30-19:16
2 stops17h 46m
Lambert-St Louis
Sun 13/9
08:20-10:00
2 stops43h 40m
£737
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 14/10
09:30-18:41
1 stop15h 11m
Lambert-St Louis
Mon 26/10
17:00-10:25
1 stop12h 25m
£779
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Tue 25/8
08:45-19:16
2 stops16h 31m
Lambert-St Louis
Fri 25/9
11:35-06:55
2 stops13h 20m
£789
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 28/10
12:15-22:25
2 stops15h 10m
Lambert-St Louis
Tue 3/11
11:00-10:50
3 stops17h 50m
£792
Flights are sorted by cheapest return flights first.
Deals found on 5/8
Showing 1-10 of 21 resultsSorted by cheapest first
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Best time to book a flight from Heathrow to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Heathrow with our price prediction graph.
LHR-STL
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from London Heathrow Airport to St. Louis
Prices
Delays
More
How far ahead should I book a flight from London Heathrow Airport to St. Louis?
To ensure you get the cheapest price possible for a flight from London Heathrow Airport to St. Louis, you should look to book at least 25 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from London Heathrow Airport to St. Louis?
Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £536). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £980). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from LHR to STL?
Find hourly flight availability from Heathrow to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 8 August 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to St. Louis as you normally would.
How much does it cost for a return flight from London Heathrow Airport to St. Louis?
Airfare is below average for this route at the moment.
London Heathrow Airport to St. Louis flights typically cost between £729 and £1,148 in September.The cheapest return price found within the last 5 days was £602 on Scandinavian Airlines (30 Sept–3 Oct).
How often are flights from London to St. Louis delayed?
About 12% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 118 minutes.
What is the most punctual flight time for London to St. Louis flights?
Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Friday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to St. Louis flights?
Over the past year, British Airways have had the lowest number of delays on this route, with just 12% of flights being delayed.
What’s the top stopover airport for flights from London Heathrow Airport to St. Louis?
Share of one-stop return flights from London Heathrow Airport to St. Louis chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Atlanta (ATL) – chosen by Cheapflights users on 39% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.
What’s the cheapest stopover airport for flights from London Heathrow Airport to St. Louis?
Average return fare for one-stop flights from London Heathrow Airport to St. Louis, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £373.
What’s the fastest stopover option from London Heathrow Airport to St. Louis?
Shortest average travel time for one-stop one-way flights from London Heathrow Airport to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 11h 05m.
Which airport typically offers the quickest stopover for flights from London Heathrow Airport to St. Louis?
Average stopover duration for one-stop one-way flights from London Heathrow Airport to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated 8 August 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andAmerican Airlines from London Heathrow Airport to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
First time flying with Virgin. It was everything I hoped it would be.
Related info for your journey
Find useful and relevant information for your journey from Heathrow to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
What airport do you fly into for flights to St. Louis from London Heathrow?
For a flight from London Heathrow to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 2 inbound flights from London Heathrow per day. 9 airlines have flights to Lambert-St Louis from London Heathrow on a regular basis.
How long is the flight from London Heathrow Airport to St. Louis?
Departing from London Heathrow Airport to St. Louis will take you 13h 03m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from London Heathrow Airport to St. Louis round-trip?
Cheapflights users have booked flights from London Heathrow Airport to St. Louis round-trip from £220. Other airlines that can offer you cheap pricing are Aer Lingus, from £366, and Lufthansa, from £422. American Airlines is priced at 70% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to St. Louis one-way?
For one-way options, check prices for British Airways. According to our data, you can fly for as low as £341. Users have also found prices from £356 and £360 on United Airlines and Finnair, respectively.
What are the most reliable airlines from London Heathrow Airport to St. Louis?
The top 3 most reliable airlines when flying from London Heathrow Airport to St. Louis are American Airlines (77%), Aer Lingus (77%) and Finnair (77%).
What are the cheapest flights from London Heathrow Airport to St. Louis?
While on average a flight from London Heathrow Airport to St. Louis is generally £931, our data shows the cheapest flight currently is £726. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £586 for that flight.
Can I find deals for business class flights from Heathrow to St. Louis?
Yes. Cheapflights offers flight deals from Heathrow to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London Heathrow Airport to St. Louis?
Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £536). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £980). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 8 August 2026.
Discover the top 9 airlines that operate flights from Heathrow to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 8 August 2026.
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Heathrow to St. Louis?
Cheapflights makes it easy to find Heathrow to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.
Why should you use Cheapflights to find cheap flight tickets from Heathrow to St. Louis?
By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Louis from Heathrow.
Can Cheapflights find flights from Heathrow to St. Louis with no change fees?
Certainly. Search results for flights to St. Louis from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights from Heathrow to St. Louis become cheaper?
Yes, Cheapflights offers price alerts on Heathrow to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.
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