Cheap flights from London Heathrow Airport to St. Louis from £348
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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
4 Mar — 11 Mar1
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 89 days in advance, depart on a Thursday or Friday and return on a Monday
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 2 February 2026.
Mon 2/311:30
LHR
-
STL
2 stops18h 06m
Virgin Atlantic
Mon 16/313:39
STL
-
LHR
2 stops15h 36m
Virgin Atlantic
Deal found 1/2£497
Tue 17/309:55
LHR
-
STL
1 stop13h 57m
British Airways
Tue 24/314:06
STL
-
LHR
1 stop12h 14m
British Airways
Deal found 31/1£529
Tue 27/1020:25
LHR
-
STL
2 stops29h 12m
Virgin Atlantic
Mon 2/1117:30
STL
-
LHR
1 stop30h 55m
Virgin Atlantic
Deal found 31/1£535
Wed 18/309:55
LHR
-
STL
1 stop13h 12m
Finnair
Wed 25/310:33
STL
-
LHR
2 stops15h 27m
Finnair
Deal found 1/2£536
Tue 17/315:35
LHR
-
STL
2 stops24h 54m
Finnair
Tue 24/318:37
STL
-
LHR
1 stop10h 48m
Finnair
Deal found 31/1£537
Mon 4/509:20
LHR
-
STL
1 stop14h 24m
Virgin Atlantic
Sun 10/518:04
STL
-
LHR
1 stop31h 06m
Virgin Atlantic
Deal found 31/1£548
Wed 18/308:40
LHR
-
STL
2 stops19h 45m
Delta
Wed 25/312:04
STL
-
LHR
1 stop13h 21m
Delta
Deal found 1/2£550
Wed 18/309:55
LHR
-
STL
1 stop14h 35m
British Airways
Wed 25/316:13
STL
-
LHR
1 stop12h 47m
British Airways
Deal found 1/2£551
Tue 17/306:30
LHR
-
STL
2 stops16h 23m
Virgin Atlantic
Tue 24/312:28
STL
-
LHR
2 stops15h 17m
Virgin Atlantic
Deal found 31/1£552
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 2 February 2026.
Mon 2/311:30
LHR
-
STL
2 stops18h 06m
Virgin Atlantic
Mon 16/318:59
STL
-
LHR
1 stop33h 01m
Virgin Atlantic
Deal found 1/2£499
Tue 17/315:35
LHR
-
STL
2 stops24h 54m
Finnair
Tue 24/318:37
STL
-
LHR
1 stop10h 48m
Finnair
Deal found 31/1£537
Wed 18/308:40
LHR
-
STL
2 stops19h 45m
Delta
Wed 25/312:04
STL
-
LHR
1 stop13h 21m
Delta
Deal found 1/2£550
Tue 17/306:30
LHR
-
STL
2 stops16h 23m
Virgin Atlantic
Tue 24/312:28
STL
-
LHR
1 stop13h 37m
Virgin Atlantic
Deal found 31/1£552
Tue 17/306:30
LHR
-
STL
2 stops16h 23m
Delta
Tue 24/312:04
STL
-
LHR
2 stops15h 41m
Delta
Deal found 31/1£552
Mon 2/311:45
LHR
-
STL
2 stops17h 51m
Delta
Mon 16/310:50
STL
-
LHR
2 stops15h 05m
Delta
Deal found 31/1£552
Thu 16/412:25
LHR
-
STL
1 stop16h 49m
Virgin Atlantic
Thu 23/413:02
STL
-
LHR
1 stop11h 43m
Virgin Atlantic
Deal found 31/1£567
Mon 11/509:55
LHR
-
STL
2 stops17h 19m
Delta
Thu 14/510:43
STL
-
LHR
1 stop13h 42m
Delta
Deal found 1/2£561
Mon 20/408:40
LHR
-
STL
2 stops18h 02m
Delta
Wed 13/510:43
STL
-
LHR
1 stop14h 02m
Delta
Deal found 31/1£563
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 2 February 2026.
Tue 7/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 21/721:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 1/2£680
Wed 1/716:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Tue 14/721:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 30/1£694
Sun 14/616:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Tue 30/621:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 31/1£741
Sun 10/516:25
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Wed 13/521:35
STL
-
LHR
Nonstop8h 00m
Multiple Airlines
Deal found 1/2£877
Fri 31/716:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Wed 12/821:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 1/2£1,184
Fri 31/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 11/821:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 1/2£1,192
Fri 31/716:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Sun 9/821:40
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 1/2£1,214
Fri 31/716:25
LHR
-
STL
Nonstop9h 05m
British Airways
Fri 14/821:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 1/2£1,222
Sun 10/516:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Sun 31/521:40
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 1/2£1,682
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 2 February 2026 and is based on user searches.
Sat 31/114:50
LHR
-
STL
3 stops30h 39m
Multiple Airlines
Sun 8/316:05
STL
-
LHR
1 stop11h 25m
Multiple Airlines
Deal found 31/1£1,111
Fri 6/211:45
LHR
-
STL
1 stop12h 49m
American Airlines
Sat 14/213:30
STL
-
LHR
1 stop12h 20m
American Airlines
Deal found 1/2£1,055
Fri 6/216:45
LHR
-
STL
2 stops29h 18m
Multiple Airlines
Sat 14/208:17
STL
-
LHR
2 stops19h 38m
Multiple Airlines
Deal found 1/2£1,112
Sun 8/212:05
LHR
-
STL
2 stops57h 24m
Multiple Airlines
Thu 12/215:47
STL
-
LHR
1 stop11h 13m
Multiple Airlines
Deal found 31/1£1,083
Sun 8/218:00
LHR
-
STL
1 stop27h 29m
Air Canada
Thu 12/216:05
STL
-
LHR
1 stop10h 25m
Air Canada
Deal found 31/1£1,109
Wed 18/209:55
LHR
-
STL
1 stop13h 03m
American Airlines
Tue 17/316:13
STL
-
LHR
1 stop12h 47m
American Airlines
Deal found 31/1£589
Wed 18/206:30
LHR
-
STL
2 stops20h 13m
Delta
Tue 17/317:59
STL
-
LHR
1 stop9h 46m
Delta
Deal found 31/1£595
Wed 18/218:30
LHR
-
STL
3 stops33h 10m
Multiple Airlines
Tue 17/309:50
STL
-
LHR
3 stops17h 40m
Multiple Airlines
Deal found 31/1£954
Sat 28/208:20
LHR
-
STL
1 stop14h 53m
Finnair
Sun 1/318:50
STL
-
LHR
1 stop34h 50m
Finnair
Deal found 1/2£609
Sat 28/207:30
LHR
-
STL
2 stops16h 30m
Iberia
Sun 1/318:57
STL
-
LHR
1 stop30h 23m
Iberia
Deal found 1/2£619
Sat 28/206:30
LHR
-
STL
2 stops16h 12m
Delta
Sun 1/317:50
STL
-
LHR
2 stops13h 55m
Delta
Deal found 1/2£665
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 2 February 2026.
Wed 15/406:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 1/2£348
Wed 15/408:40
LHR
-
STL
2 stops18h 28m
United Airlines
Deal found 1/2£361
Sun 10/520:05
LHR
-
STL
2 stops30h 00m
Multiple Airlines
Deal found 1/2£363
Wed 15/414:45
LHR
-
STL
1 stop13h 29m
Finnair
Deal found 1/2£372
Wed 15/412:20
LHR
-
STL
3 stops48h 30m
Multiple Airlines
Deal found 1/2£380
Wed 18/213:40
LHR
-
STL
3 stops47h 11m
Multiple Airlines
Deal found 31/1£383
Fri 17/406:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 1/2£387
Tue 7/421:25
LHR
-
STL
3 stops43h 05m
Multiple Airlines
Deal found 1/2£400
Sat 7/213:40
LHR
-
STL
3 stops47h 11m
Multiple Airlines
Deal found 1/2£405
Fri 24/416:25
LHR
-
STL
Nonstop9h 05m
Finnair
Deal found 1/2£407
Fri 24/407:25
LHR
-
STL
2 stops21h 02m
United Airlines
Deal found 1/2£407
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 2 February 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 2 February 2026.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.
Fly from
Heathrow
Fly to
St. Louis
Route
Depart
Return
Price
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 2/3
11:30-23:36
2 stops18h 06m
Lambert-St Louis
Mon 16/3
18:59-09:00
1 stop33h 01m
£499
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 17/3
15:35-11:29
2 stops24h 54m
Lambert-St Louis
Tue 24/3
18:37-10:25
1 stop10h 48m
£537
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 18/3
08:40-23:25
2 stops19h 45m
Lambert-St Louis
Wed 25/3
12:04-06:25
1 stop13h 21m
£550
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 17/3
06:30-17:53
2 stops16h 23m
Lambert-St Louis
Tue 24/3
12:28-07:05
1 stop13h 37m
£552
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 17/3
06:30-17:53
2 stops16h 23m
Lambert-St Louis
Tue 24/3
12:04-08:45
2 stops15h 41m
£552
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 2/3
11:45-23:36
2 stops17h 51m
Lambert-St Louis
Mon 16/3
10:50-06:55
2 stops15h 05m
£552
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 11/5
09:55-21:14
2 stops17h 19m
Lambert-St Louis
Thu 14/5
10:43-06:25
1 stop13h 42m
£561
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 20/4
08:40-20:42
2 stops18h 02m
Lambert-St Louis
Wed 13/5
10:43-06:45
1 stop14h 02m
£563
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 16/4
12:25-23:14
1 stop16h 49m
Lambert-St Louis
Thu 23/4
13:02-06:45
1 stop11h 43m
£567
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 15/4
08:40-21:08
2 stops18h 28m
£361
Flights are sorted by cheapest return flights first.
Deals found on 1/2
Showing 1-10 of 21 results
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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
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 30 January 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 89 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 £397). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £594). 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’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 62% 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 £367.
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 2 February 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 18h 06m. 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 £167. Other airlines that can offer you cheap pricing are United Airlines, from £463, and British Airways, from £468. 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 £336. Users have also found prices from £354 and £502 on Finnair and Virgin Atlantic, 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 £664, our data shows the cheapest flight currently is £471. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £485 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 £397). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £594). 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.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 2 February 2026.
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 2 February 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 2 February 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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