Cheap flights from London Heathrow Airport to St. Louis from £289
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 29/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
6 Apr — 13 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 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 7 March 2026.
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/912:47
STL
-
LHR
1 stop12h 08m
British Airways
Deal found 4/3£526
Tue 21/412:30
LHR
-
STL
1 stop12h 59m
British Airways
Wed 29/421:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 5/3£530
Wed 13/516:25
LHR
-
STL
Nonstop9h 05m
Finnair
Thu 21/505:15
STL
-
LHR
1 stop22h 10m
Finnair
Deal found 4/3£536
Mon 13/412:15
LHR
-
STL
1 stop16h 02m
Finnair
Tue 21/412:27
STL
-
LHR
1 stop17h 43m
Finnair
Deal found 4/3£540
Tue 21/418:05
LHR
-
STL
2 stops29h 07m
Finnair
Wed 29/414:12
STL
-
LHR
1 stop12h 53m
Finnair
Deal found 5/3£541
Wed 2/910:05
LHR
-
STL
2 stops16h 14m
Finnair
Wed 23/909:32
STL
-
LHR
1 stop15h 23m
Finnair
Deal found 3/3£542
Wed 20/509:20
LHR
-
STL
1 stop12h 50m
Delta
Thu 28/510:15
STL
-
LHR
1 stop14h 55m
Delta
Deal found 4/3£544
Tue 14/409:45
LHR
-
STL
1 stop12h 15m
American Airlines
Thu 23/417:21
STL
-
LHR
1 stop11h 09m
American Airlines
Deal found 4/3£545
Wed 23/906:45
LHR
-
STL
2 stops22h 53m
British Airways
Sun 27/920:07
STL
-
LHR
1 stop28h 43m
British Airways
Deal found 3/3£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 7 March 2026.
Thu 30/421:50
LHR
-
STL
2 stops27h 39m
British Airways
Thu 7/511:45
STL
-
LHR
1 stop14h 15m
British Airways
Deal found 3/3£578
Fri 24/406:15
LHR
-
STL
2 stops16h 27m
Delta
Fri 8/519:01
STL
-
LHR
2 stops13h 34m
Delta
Deal found 3/3£630
Fri 24/416:25
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Fri 8/506:00
STL
-
LHR
1 stop18h 20m
Multiple Airlines
Deal found 3/3£632
Tue 19/511:30
LHR
-
STL
2 stops15h 39m
Virgin Atlantic
Thu 28/513:56
STL
-
LHR
2 stops13h 19m
Virgin Atlantic
Deal found 2/3£693
Thu 30/406:40
LHR
-
STL
3 stops22h 56m
Scandinavian Airlines
Thu 7/510:49
STL
-
LHR
2 stops23h 11m
Scandinavian Airlines
Deal found 3/3£732
Thu 30/411:45
LHR
-
STL
2 stops17h 51m
Delta
Sun 31/516:20
STL
-
LHR
1 stop16h 15m
Delta
Deal found 2/3£658
Tue 19/516:25
LHR
-
STL
Nonstop9h 05m
British Airways
Thu 28/513:45
STL
-
LHR
1 stop13h 20m
British Airways
Deal found 6/3£704
Thu 16/410:45
LHR
-
STL
1 stop11h 57m
Delta
Sat 18/417:59
STL
-
LHR
1 stop31h 11m
Delta
Deal found 4/3£666
Tue 19/506:30
LHR
-
STL
2 stops16h 35m
Delta
Thu 28/510:49
STL
-
LHR
2 stops14h 21m
Delta
Deal found 6/3£712
Wed 1/706:30
LHR
-
STL
2 stops16h 25m
Delta
Wed 15/719:05
STL
-
LHR
2 stops13h 30m
Delta
Deal found 6/3£712
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 7 March 2026.
Tue 21/416:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 29/421:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 5/3£542
Tue 21/416:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 28/421:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 6/3£571
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 4/3£589
Wed 20/516:25
LHR
-
STL
Nonstop9h 05m
British Airways
Fri 29/521:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 4/3£679
Wed 13/516:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 19/521:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 4/3£689
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
Iberia
Wed 23/921:35
STL
-
LHR
Nonstop8h 00m
Iberia
Deal found 3/3£690
Wed 1/716:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Wed 15/721:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 6/3£720
Sun 19/416:25
LHR
-
STL
Nonstop9h 05m
Finnair
Sun 26/421:40
STL
-
LHR
Nonstop8h 00m
Finnair
Deal found 5/3£732
Fri 24/416:25
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Fri 8/521:35
STL
-
LHR
Nonstop8h 00m
Multiple Airlines
Deal found 4/3£735
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 7 March 2026 and is based on user searches.
Sat 11/408:55
LHR
-
STL
1 stop14h 26m
American Airlines
Wed 22/418:11
STL
-
LHR
1 stop14h 14m
American Airlines
Deal found 4/3£575
Mon 13/412:15
LHR
-
STL
1 stop16h 02m
Finnair
Tue 21/412:27
STL
-
LHR
1 stop17h 43m
Finnair
Deal found 4/3£540
Tue 14/410:05
LHR
-
STL
1 stop15h 25m
American Airlines
Wed 22/418:55
STL
-
LHR
1 stop11h 55m
American Airlines
Deal found 4/3£545
Mon 20/414:45
LHR
-
STL
1 stop13h 32m
Finnair
Thu 30/407:05
STL
-
LHR
1 stop18h 35m
Finnair
Deal found 3/3£542
Mon 20/408:55
LHR
-
STL
1 stop14h 26m
British Airways
Thu 30/414:12
STL
-
LHR
1 stop10h 43m
British Airways
Deal found 5/3£559
Mon 20/409:55
LHR
-
STL
2 stops16h 49m
Delta
Thu 30/409:59
STL
-
LHR
2 stops15h 11m
Delta
Deal found 2/3£567
Tue 21/412:30
LHR
-
STL
1 stop12h 59m
British Airways
Wed 29/420:03
STL
-
LHR
1 stop10h 12m
British Airways
Deal found 5/3£530
Tue 21/418:05
LHR
-
STL
2 stops29h 07m
Finnair
Wed 29/414:12
STL
-
LHR
1 stop12h 53m
Finnair
Deal found 5/3£541
Tue 21/412:15
LHR
-
STL
1 stop13h 18m
British Airways
Tue 28/414:33
STL
-
LHR
1 stop11h 07m
British Airways
Deal found 6/3£561
Thu 30/411:00
LHR
-
STL
2 stops17h 17m
Finnair
Thu 7/511:25
STL
-
LHR
2 stops14h 35m
Finnair
Deal found 4/3£570
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 7 March 2026.
Wed 29/409:55
LHR
-
STL
3 stops39h 26m
Multiple Airlines
Deal found 3/3£289
Mon 27/422:15
LHR
-
STL
3 stops38h 35m
Multiple Airlines
Deal found 6/3£322
Wed 29/406:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 3/3£349
Mon 11/508:40
LHR
-
STL
2 stops18h 33m
United Airlines
Deal found 4/3£362
Wed 29/408:40
LHR
-
STL
2 stops20h 31m
United Airlines
Deal found 3/3£364
Wed 29/416:25
LHR
-
STL
Nonstop9h 05m
Finnair
Deal found 3/3£365
Wed 1/409:55
LHR
-
STL
3 stops37h 39m
Multiple Airlines
Deal found 3/3£366
Mon 11/514:45
LHR
-
STL
1 stop13h 34m
Finnair
Deal found 4/3£371
Sun 26/413:35
LHR
-
STL
2 stops37h 38m
United Airlines
Deal found 4/3£373
Sun 10/520:05
LHR
-
STL
2 stops30h 20m
Multiple Airlines
Deal found 4/3£377
Mon 27/408:40
LHR
-
STL
2 stops29h 45m
United Airlines
Deal found 6/3£378
Sun 26/420:50
LHR
-
STL
3 stops56h 29m
Multiple Airlines
Deal found 4/3£382
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 7 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 7 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
Thu 30/4
21:50-19:29
2 stops27h 39m
Lambert-St Louis
Thu 7/5
11:45-08:00
1 stop14h 15m
£578
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/4
06:15-16:42
2 stops16h 27m
Lambert-St Louis
Fri 8/5
19:01-14:35
2 stops13h 34m
£630
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/4
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Fri 8/5
06:00-06:20
1 stop18h 20m
£632
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 30/4
11:45-23:36
2 stops17h 51m
Lambert-St Louis
Sun 31/5
16:20-14:35
1 stop16h 15m
£658
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 16/4
10:45-16:42
1 stop11h 57m
Lambert-St Louis
Sat 18/4
17:59-07:10
1 stop31h 11m
£666
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 19/5
11:30-21:09
2 stops15h 39m
Lambert-St Louis
Thu 28/5
13:56-09:15
2 stops13h 19m
£693
Fastest return journey
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 19/5
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Thu 28/5
13:45-09:05
1 stop13h 20m
£704
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 19/5
06:30-17:05
2 stops16h 35m
Lambert-St Louis
Thu 28/5
10:49-07:10
2 stops14h 21m
£712
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 1/7
06:30-16:55
2 stops16h 25m
Lambert-St Louis
Wed 15/7
19:05-14:35
2 stops13h 30m
£712
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 30/4
06:40-23:36
3 stops22h 56m
Lambert-St Louis
Thu 7/5
10:49-16:00
2 stops23h 11m
£732
Flights are sorted by cheapest return flights first.
Deals found on 3/3
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
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 6 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 £407). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £625). 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 56% 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 7 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 16h 27m. 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 £171. Other airlines that can offer you cheap pricing are United Airlines, from £474, 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 £363 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 £705, our data shows the cheapest flight currently is £543. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £526 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 £407). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £625). 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 7 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 7 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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