Cheap flights from London Heathrow Airport to St. Louis from £371
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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
21 Apr — 28 Apr1
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 Tuesday 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 22 March 2026.
Mon 5/1014:10
LHR
-
STL
2 stops24h 54m
Finnair
Sun 11/1019:00
STL
-
LHR
2 stops29h 25m
Finnair
Deal found 17/3£571
Mon 20/413:25
LHR
-
STL
1 stop34h 19m
Virgin Atlantic
Thu 30/413:46
STL
-
LHR
1 stop11h 24m
Virgin Atlantic
Deal found 18/3£572
Wed 2/914:30
LHR
-
STL
2 stops15h 21m
Finnair
Wed 23/909:46
STL
-
LHR
1 stop16h 14m
Finnair
Deal found 18/3£573
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/916:47
STL
-
LHR
1 stop10h 38m
British Airways
Deal found 18/3£587
Mon 20/408:55
LHR
-
STL
1 stop16h 35m
Finnair
Thu 30/412:27
STL
-
LHR
2 stops13h 33m
Finnair
Deal found 17/3£591
Tue 5/511:00
LHR
-
STL
2 stops17h 19m
Finnair
Tue 12/517:49
STL
-
LHR
2 stops21h 51m
Finnair
Deal found 21/3£594
Sun 3/518:10
LHR
-
STL
2 stops34h 07m
Finnair
Sun 10/517:21
STL
-
LHR
2 stops30h 54m
Finnair
Deal found 19/3£597
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 22 March 2026.
Mon 20/411:45
LHR
-
STL
2 stops17h 51m
Delta
Thu 30/417:59
STL
-
LHR
2 stops13h 46m
Delta
Deal found 17/3£622
Thu 17/912:30
LHR
-
STL
1 stop12h 28m
British Airways
Wed 30/916:47
STL
-
LHR
1 stop10h 38m
British Airways
Deal found 18/3£639
Fri 1/509:45
LHR
-
STL
1 stop12h 15m
British Airways
Mon 4/517:21
STL
-
LHR
1 stop11h 09m
British Airways
Deal found 18/3£639
Thu 16/408:40
LHR
-
STL
2 stops18h 04m
Delta
Thu 30/416:41
STL
-
LHR
2 stops13h 29m
Delta
Deal found 18/3£643
Fri 24/406:15
LHR
-
STL
2 stops17h 29m
Delta
Sun 10/516:25
STL
-
LHR
1 stop16h 10m
Delta
Deal found 18/3£648
Fri 18/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 30/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 18/3£652
Fri 17/414:45
LHR
-
STL
1 stop13h 32m
British Airways
Fri 24/414:12
STL
-
LHR
1 stop10h 43m
British Airways
Deal found 18/3£669
Wed 15/406:30
LHR
-
STL
2 stops16h 20m
Delta
Fri 24/413:46
STL
-
LHR
1 stop11h 24m
Delta
Deal found 18/3£686
Sat 11/408:40
LHR
-
STL
2 stops20h 45m
Delta
Sun 26/418:50
STL
-
LHR
2 stops13h 45m
Delta
Deal found 19/3£686
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 22 March 2026.
Fri 18/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 29/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 18/3£607
Tue 1/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 15/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 22/3£618
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 18/3£623
Wed 22/416:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sun 26/421:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 17/3£630
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 22/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 21/3£642
Fri 18/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sun 4/1021:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 19/3£645
Fri 18/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 30/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 18/3£652
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Fri 18/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 21/3£672
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
Finnair
Sun 20/921:40
STL
-
LHR
Nonstop8h 00m
Finnair
Deal found 21/3£684
Fri 11/916:25
LHR
-
STL
Nonstop9h 05m
Iberia
Sun 20/921:40
STL
-
LHR
Nonstop8h 00m
Iberia
Deal found 21/3£702
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 22 March 2026 and is based on user searches.
Mon 20/409:45
LHR
-
STL
1 stop12h 15m
Finnair
Thu 30/414:12
STL
-
LHR
1 stop10h 43m
Finnair
Deal found 17/3£571
Mon 20/413:25
LHR
-
STL
1 stop34h 19m
Virgin Atlantic
Thu 30/413:46
STL
-
LHR
1 stop11h 24m
Virgin Atlantic
Deal found 18/3£572
Mon 20/412:15
LHR
-
STL
1 stop16h 02m
Multiple Airlines
Mon 4/513:29
STL
-
LHR
1 stop11h 21m
Multiple Airlines
Deal found 18/3£610
Tue 21/416:25
LHR
-
STL
Nonstop9h 05m
Finnair
Mon 27/409:10
STL
-
LHR
1 stop15h 45m
Finnair
Deal found 17/3£567
Tue 21/411:45
LHR
-
STL
2 stops17h 51m
KLM
Mon 27/413:02
STL
-
LHR
1 stop11h 23m
KLM
Deal found 17/3£588
Tue 21/406:30
LHR
-
STL
2 stops16h 20m
Delta
Mon 27/416:41
STL
-
LHR
2 stops13h 24m
Delta
Deal found 17/3£611
Thu 30/414:10
LHR
-
STL
2 stops51h 03m
Finnair
Thu 7/511:25
STL
-
LHR
2 stops14h 35m
Finnair
Deal found 17/3£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 22 March 2026.
Tue 5/517:15
LHR
-
STL
2 stops33h 10m
Air Canada
Deal found 17/3£371
Tue 5/519:30
LHR
-
STL
1 stop23h 55m
Lufthansa
Deal found 17/3£379
Tue 19/521:10
LHR
-
STL
3 stops29h 59m
Multiple Airlines
Deal found 19/3£381
Mon 13/422:05
LHR
-
STL
3 stops38h 45m
Multiple Airlines
Deal found 19/3£396
Tue 5/520:50
LHR
-
STL
3 stops50h 04m
Multiple Airlines
Deal found 17/3£402
Fri 29/516:25
LHR
-
STL
Nonstop9h 05m
British Airways
Deal found 18/3£403
Sun 13/915:30
LHR
-
STL
1 stop27h 55m
United Airlines
Deal found 19/3£405
Mon 20/422:05
LHR
-
STL
3 stops38h 45m
Multiple Airlines
Deal found 21/3£406
Mon 18/522:05
LHR
-
STL
3 stops40h 50m
Multiple Airlines
Deal found 19/3£407
Fri 8/506:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 17/3£408
Fri 8/508:40
LHR
-
STL
2 stops17h 45m
Air Canada
Deal found 17/3£413
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 22 March 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 22 March 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
Mon 20/4
11:45-23:36
2 stops17h 51m
Lambert-St Louis
Thu 30/4
17:59-13:45
2 stops13h 46m
£622
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 17/9
12:30-18:58
1 stop12h 28m
Lambert-St Louis
Wed 30/9
16:47-09:25
1 stop10h 38m
£639
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 1/5
09:45-16:00
1 stop12h 15m
Lambert-St Louis
Mon 4/5
17:21-10:30
1 stop11h 09m
£639
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 16/4
08:40-20:44
2 stops18h 04m
Lambert-St Louis
Thu 30/4
16:41-12:10
2 stops13h 29m
£643
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/4
06:15-17:44
2 stops17h 29m
Lambert-St Louis
Sun 10/5
16:25-14:35
1 stop16h 10m
£648
Fastest return journey
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 18/9
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Wed 30/9
21:35-11:35
Nonstop8h 00m
£652
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 17/4
14:45-22:17
1 stop13h 32m
Lambert-St Louis
Fri 24/4
14:12-06:55
1 stop10h 43m
£669
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 15/4
06:30-16:50
2 stops16h 20m
Lambert-St Louis
Fri 24/4
13:46-07:10
1 stop11h 24m
£686
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sat 11/4
08:40-23:25
2 stops20h 45m
Lambert-St Louis
Sun 26/4
18:50-14:35
2 stops13h 45m
£686
Cheapest one-way
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sat 5/9
12:15-23:51
1 stop17h 36m
£435
Flights are sorted by cheapest return flights first.
Deals found on 18/3
Showing 1-10 of 19 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
More
How far ahead should I book a flight from London Heathrow Airport to St. Louis?
Use this chart to determine the optimal time to book a return flight from Heathrow to St. Louis. Price data was last updated on 13 March 2026.
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 72 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £408). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £627). 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.
How much does it cost for a return flight from London Heathrow Airport to St. Louis?
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 55% 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 £376.
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 22 March 2026.
Get a feel of what it's like to fly with Finnair,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.
baggage allowance was different between the outgoing and inbound flights
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 0 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 12h 28m. 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 United Airlines, from £475, and British Airways, from £481. 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 £360 and £364 on United Airlines and Finnair, respectively.
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 £1,382, our data shows the cheapest flight currently is £540. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £592 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £408). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £627). 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 22 March 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 22 March 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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