Cheap flights from London Heathrow Airport to St. Louis from £365
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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
12 Sep — 19 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
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Last-minute
One-way
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 13 August 2026.
Sat 26/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 12/8£567
Tue 15/908:55 -
1 stop16h 12m
Tue 29/921:35 -
Nonstop8h 00m
Deal found 10/8£586
Sat 17/1006:40 -
2 stops23h 14m
Sun 1/1112:00 -
2 stops22h 00m
Deal found 10/8£591
Wed 16/918:05 -
2 stops56h 39m
Wed 23/917:18 -
1 stop11h 32m
Deal found 11/8£599
Wed 30/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 11/8£601
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/912:46 -
1 stop19h 39m
Deal found 9/8£612
Mon 7/906:30 -
1 stop12h 55m
Tue 15/918:53 -
1 stop11h 02m
Deal found 10/8£612
Mon 7/906:30 -
1 stop12h 55m
Wed 7/1013:29 -
1 stop16h 26m
Deal found 10/8£613
Wed 9/906:30 -
1 stop12h 55m
Wed 16/912:28 -
1 stop11h 27m
Deal found 12/8£614
Wed 9/908:40 -
2 stops16h 01m
Wed 23/912:10 -
1 stop15h 50m
Deal found 8/8£616
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 13 August 2026.
Wed 30/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 12/8£601
Wed 9/908:40 -
2 stops16h 36m
Wed 23/910:53 -
2 stops14h 22m
Deal found 10/8£631
Wed 9/908:40 -
2 stops16h 36m
Wed 16/912:59 -
1 stop11h 46m
Deal found 10/8£631
Mon 30/1107:30 -
2 stops21h 54m
Thu 3/1213:08 -
1 stop12h 47m
Deal found 12/8£635
Mon 7/906:50 -
2 stops16h 16m
Mon 14/915:32 -
2 stops13h 08m
Deal found 10/8£636
Sun 20/909:30 -
1 stop33h 55m
Sun 27/916:50 -
1 stop21h 50m
Deal found 11/8£646
Tue 8/915:30 -
1 stop27h 55m
Tue 15/908:30 -
1 stop16h 15m
Deal found 11/8£646
Sun 6/909:30 -
1 stop33h 55m
Sun 13/916:50 -
1 stop21h 50m
Deal found 9/8£646
Mon 30/1111:10 -
2 stops30h 56m
Fri 4/1215:15 -
2 stops13h 35m
Deal found 12/8£664
Mon 30/1107:30 -
2 stops17h 53m
Sat 5/1213:30 -
1 stop14h 10m
Deal found 12/8£665
Thu 1/1006:50 -
2 stops14h 53m
Mon 30/1113:08 -
2 stops14h 02m
Deal found 8/8£665
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 13 August 2026.
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 9/8£612
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 8/8£709
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 11/8£711
Fri 4/916:25 -
Nonstop9h 05m
Fri 25/921:35 -
Nonstop8h 00m
Deal found 12/8£721
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 9/8£728
Tue 1/916:25 -
Nonstop9h 05m
Tue 8/921:35 -
Nonstop8h 00m
Deal found 9/8£731
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 13 August 2026 and is based on user searches.
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/912:46 -
1 stop19h 39m
Deal found 9/8£612
Mon 7/906:30 -
1 stop12h 55m
Tue 15/918:53 -
1 stop11h 02m
Deal found 10/8£612
Mon 7/906:30 -
1 stop12h 55m
Wed 7/1013:29 -
1 stop16h 26m
Deal found 10/8£613
Wed 9/906:30 -
1 stop12h 55m
Wed 16/912:28 -
1 stop11h 27m
Deal found 12/8£614
Wed 9/908:40 -
2 stops16h 01m
Wed 23/912:10 -
1 stop15h 50m
Deal found 8/8£616
Tue 15/908:55 -
1 stop16h 12m
Tue 29/921:35 -
Nonstop8h 00m
Deal found 10/8£586
Wed 16/918:05 -
2 stops56h 39m
Wed 23/917:18 -
1 stop11h 32m
Deal found 11/8£599
Sat 26/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 12/8£567
Wed 30/917:00 -
2 stops36h 42m
Sat 3/1015:54 -
2 stops18h 06m
Deal found 11/8£601
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 13 August 2026.
Tue 10/1112:15 -
3 stops51h 25m
Deal found 10/8£365
Wed 11/1112:15 -
3 stops27h 25m
Deal found 10/8£369
Mon 9/1112:15 -
3 stops51h 25m
Deal found 11/8£378
Tue 13/1013:05 -
3 stops50h 35m
Deal found 11/8£381
Wed 7/1013:05 -
3 stops26h 35m
Deal found 11/8£389
Wed 28/1012:15 -
3 stops26h 25m
Deal found 12/8£392
Wed 30/915:00 -
3 stops52h 10m
Deal found 8/8£395
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 13 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 13 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
£601
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 9/9
08:40-19:16
2 stops16h 36m
Lambert-St Louis
Wed 23/9
10:53-07:15
2 stops14h 22m
£631
Fastest return journey
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 9/9
08:40-19:16
2 stops16h 36m
Lambert-St Louis
Wed 16/9
12:59-06:45
1 stop11h 46m
£631
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 30/11
07:30-23:24
2 stops21h 54m
Lambert-St Louis
Thu 3/12
13:08-07:55
1 stop12h 47m
£635
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 7/9
06:50-17:06
2 stops16h 16m
Lambert-St Louis
Mon 14/9
15:32-10:40
2 stops13h 08m
£636
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Sun 20/9
09:30-13:25
1 stop33h 55m
Lambert-St Louis
Sun 27/9
16:50-20:40
1 stop21h 50m
£646
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Tue 8/9
15:30-13:25
1 stop27h 55m
Lambert-St Louis
Tue 15/9
08:30-06:45
1 stop16h 15m
£646
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Sun 6/9
09:30-13:25
1 stop33h 55m
Lambert-St Louis
Sun 13/9
16:50-20:40
1 stop21h 50m
£646
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 30/11
11:10-12:06
2 stops30h 56m
Lambert-St Louis
Fri 4/12
15:15-10:50
2 stops13h 35m
£664
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 30/11
07:30-19:23
2 stops17h 53m
Lambert-St Louis
Sat 5/12
13:30-09:40
1 stop14h 10m
£665
Flights are sorted by cheapest return flights first.
Deals found on 9/8
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 £535). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £978). 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 13 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 £727 and £1,145 in September.The cheapest return price found within the last 5 days was £567 on Scandinavian Airlines (26 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 48% 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 £372.
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 13 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 16h 36m. 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 United Airlines, from £284, and Aer Lingus, from £365. 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 £340. Users have also found prices from £356 and £399 on United Airlines and Lufthansa, 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 £942, our data shows the cheapest flight currently is £724. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £578 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 £535). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £978). 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.
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 13 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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