Cheap flights from London Heathrow Airport to St. Louis from £350
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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
9 Jul — 16 Jul1
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 March, booked 72 days in advance, depart on a Thursday or Monday and return on a Wednesday
Cheap flight deals from Heathrow to St. Louis
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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 9 June 2026.
Tue 7/706:30
LHR
-
STL
2 stops16h 16m
Delta
Tue 21/709:24
STL
-
LHR
2 stops15h 46m
Delta
Deal found 7/6£771
Sat 4/709:15
LHR
-
STL
1 stop13h 47m
British Airways
Fri 10/719:56
STL
-
LHR
1 stop10h 19m
British Airways
Deal found 5/6£772
Sat 17/1009:45
LHR
-
STL
1 stop12h 30m
British Airways
Fri 30/1007:38
STL
-
LHR
1 stop19h 57m
British Airways
Deal found 4/6£773
Wed 16/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 6/6£774
Tue 7/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sun 12/721:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 7/6£775
Tue 11/816:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 15/913:54
STL
-
LHR
1 stop11h 01m
British Airways
Deal found 8/6£775
Mon 19/1009:55
LHR
-
STL
2 stops16h 54m
Delta
Wed 28/1011:51
STL
-
LHR
2 stops13h 29m
Delta
Deal found 4/6£776
Fri 10/708:40
LHR
-
STL
2 stops16h 02m
Air Canada
Fri 24/714:40
STL
-
LHR
2 stops13h 20m
Air Canada
Deal found 9/6£777
Sat 20/609:15
LHR
-
STL
1 stop14h 10m
British Airways
Fri 10/719:56
STL
-
LHR
1 stop10h 19m
British Airways
Deal found 5/6£780
Tue 7/714:05
LHR
-
STL
2 stops15h 24m
Multiple Airlines
Sun 12/712:10
STL
-
LHR
2 stops14h 25m
Multiple Airlines
Deal found 7/6£783
Mon 10/815:15
LHR
-
STL
1 stop14h 59m
British Airways
Thu 10/918:43
STL
-
LHR
1 stop12h 07m
British Airways
Deal found 5/6£787
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 9 June 2026.
Sat 4/709:15
LHR
-
STL
1 stop12h 13m
British Airways
Sun 12/721:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 5/6£772
Mon 19/1009:55
LHR
-
STL
2 stops16h 54m
Delta
Wed 28/1017:30
STL
-
LHR
1 stop10h 30m
Delta
Deal found 4/6£776
Tue 11/808:30
LHR
-
STL
1 stop11h 32m
United Airlines
Tue 15/911:15
STL
-
LHR
2 stops13h 40m
United Airlines
Deal found 8/6£807
Fri 24/706:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Fri 31/713:13
STL
-
LHR
1 stop11h 32m
Lufthansa
Deal found 9/6£833
Wed 1/715:00
LHR
-
STL
1 stop14h 44m
British Airways
Tue 21/721:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 8/6£798
Fri 10/706:30
LHR
-
STL
2 stops16h 54m
Delta
Tue 14/710:19
STL
-
LHR
2 stops16h 31m
Delta
Deal found 6/6£804
Fri 24/706:50
LHR
-
STL
2 stops14h 56m
United Airlines
Fri 31/708:35
STL
-
LHR
1 stop21h 00m
United Airlines
Deal found 9/6£838
Fri 10/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Mon 13/717:58
STL
-
LHR
1 stop10h 32m
British Airways
Deal found 6/6£810
Fri 10/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 14/721:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 6/6£810
Sat 1/806:30
LHR
-
STL
2 stops16h 16m
Delta
Thu 10/1209:00
STL
-
LHR
1 stop15h 25m
Delta
Deal found 7/6£899
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 9 June 2026.
Wed 16/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 6/6£774
Tue 7/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sun 12/721:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 7/6£775
Wed 23/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Fri 2/1021:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 6/6£795
Tue 1/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 15/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 8/6£797
Tue 7/716:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Sun 12/721:40
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 8/6£806
Fri 10/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 14/721:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 6/6£810
Wed 23/916:25
LHR
-
STL
Nonstop9h 05m
Iberia
Fri 2/1021:35
STL
-
LHR
Nonstop8h 00m
Iberia
Deal found 9/6£822
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 9 June 2026 and is based on user searches.
Sat 20/609:15
LHR
-
STL
1 stop14h 10m
British Airways
Fri 10/719:56
STL
-
LHR
1 stop10h 19m
British Airways
Deal found 5/6£780
Sat 4/709:15
LHR
-
STL
1 stop13h 47m
British Airways
Fri 10/719:56
STL
-
LHR
1 stop10h 19m
British Airways
Deal found 5/6£772
Sun 5/712:15
LHR
-
STL
1 stop18h 01m
Multiple Airlines
Sat 11/720:06
STL
-
LHR
2 stops32h 29m
Multiple Airlines
Deal found 5/6£798
Sun 5/712:15
LHR
-
STL
1 stop18h 01m
Iberia
Sun 12/721:40
STL
-
LHR
Nonstop8h 00m
Iberia
Deal found 5/6£798
Mon 6/720:05
LHR
-
STL
2 stops23h 00m
Delta
Sun 12/718:09
STL
-
LHR
1 stop31h 01m
Delta
Deal found 5/6£789
Mon 6/709:30
LHR
-
STL
2 stops15h 12m
Air Canada
Sun 12/712:10
STL
-
LHR
2 stops26h 50m
Air Canada
Deal found 5/6£790
Tue 7/706:30
LHR
-
STL
2 stops16h 16m
Delta
Tue 21/709:24
STL
-
LHR
2 stops15h 46m
Delta
Deal found 7/6£771
Tue 7/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sun 12/721:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 7/6£775
Tue 7/714:05
LHR
-
STL
2 stops15h 24m
Multiple Airlines
Sun 12/712:10
STL
-
LHR
2 stops14h 25m
Multiple Airlines
Deal found 7/6£783
Fri 10/708:40
LHR
-
STL
2 stops16h 02m
Air Canada
Fri 24/714:40
STL
-
LHR
2 stops13h 20m
Air Canada
Deal found 9/6£777
Tue 21/706:30
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Tue 28/712:10
STL
-
LHR
1 stop15h 50m
Multiple Airlines
Deal found 8/6£797
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 9 June 2026.
Wed 2/909:55
LHR
-
STL
3 stops44h 19m
Multiple Airlines
Deal found 5/6£350
Tue 1/920:50
LHR
-
STL
3 stops50h 40m
Multiple Airlines
Deal found 7/6£369
Tue 29/920:50
LHR
-
STL
3 stops42h 50m
Multiple Airlines
Deal found 5/6£382
Mon 28/909:55
LHR
-
STL
3 stops29h 45m
Multiple Airlines
Deal found 5/6£383
Tue 8/920:50
LHR
-
STL
3 stops42h 50m
Multiple Airlines
Deal found 8/6£384
Thu 3/920:50
LHR
-
STL
3 stops47h 58m
Multiple Airlines
Deal found 7/6£393
Sun 6/920:50
LHR
-
STL
3 stops50h 40m
Multiple Airlines
Deal found 6/6£398
Wed 2/906:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 5/6£401
Wed 2/908:40
LHR
-
STL
2 stops16h 02m
Air Canada
Deal found 9/6£402
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 9 June 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 9 June 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 - STL
LHRSTL
London Heathrow
Sat 4/7
09:15-15:28
1 stop12h 13m
Lambert-St Louis
Sun 12/7
21:40-11:40
Nonstop8h 00m
£772
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 19/10
09:55-20:49
2 stops16h 54m
Lambert-St Louis
Wed 28/10
17:30-09:00
1 stop10h 30m
£776
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 1/7
15:00-23:44
1 stop14h 44m
Lambert-St Louis
Tue 21/7
21:35-11:35
Nonstop8h 00m
£798
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 10/7
06:30-17:24
2 stops16h 54m
Lambert-St Louis
Tue 14/7
10:19-08:50
2 stops16h 31m
£804
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 11/8
08:30-14:02
1 stop11h 32m
Lambert-St Louis
Tue 15/9
11:15-06:55
2 stops13h 40m
£807
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 10/7
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Mon 13/7
17:58-10:30
1 stop10h 32m
£810
Fastest return journey
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 10/7
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Tue 14/7
21:35-11:35
Nonstop8h 00m
£810
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/7
06:30-13:25
1 stop12h 55m
Lambert-St Louis
Fri 31/7
13:13-06:45
1 stop11h 32m
£833
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/7
06:50-15:46
2 stops14h 56m
Lambert-St Louis
Fri 31/7
08:35-11:35
1 stop21h 00m
£838
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sat 1/8
06:30-16:46
2 stops16h 16m
Lambert-St Louis
Thu 10/12
09:00-06:25
1 stop15h 25m
£899
Flights are sorted by cheapest return flights first.
Deals found on 6/6
Showing 1-10 of 20 resultsSorted by cheapest first
1
2
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 71 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 £557). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £1,007). 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 9 June 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?
How often are flights from London to St. Louis delayed?
About 0% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 0 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?
Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
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.
Chicago (ORD) – chosen by Cheapflights users on 51% 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 £375.
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 9 June 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andAir Canada 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. 10 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 11h 32m. 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 £174. Other airlines that can offer you cheap pricing are Aer Lingus, from £369, and British Airways, from £480. American Airlines is priced at 76% 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 £344. Users have also found prices from £359 and £514 on United Airlines and Virgin Atlantic, 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 (84%), Aer Lingus (84%) and Finnair (84%).
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 £841, our data shows the cheapest flight currently is £454. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £540 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 £557). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £1,007). 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 9 June 2026.
Discover the top 10 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 9 June 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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