Cheap flights from London Heathrow Airport to St. Louis from £322
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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
17 Sep — 24 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 March, booked 71 days in advance, depart on a Friday or Thursday 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 18 August 2026.
Tue 15/909:45 -
1 stop16h 59m
Tue 29/912:46 -
1 stop14h 19m
Deal found 15/8£595
Wed 30/912:15 -
1 stop14h 29m
Wed 7/1017:27 -
1 stop12h 48m
Deal found 16/8£596
Tue 15/913:25 -
1 stop12h 33m
Tue 29/917:47 -
1 stop13h 18m
Deal found 15/8£597
Thu 24/918:40 -
2 stops35h 02m
Mon 28/914:30 -
2 stops19h 30m
Deal found 13/8£598
Mon 28/906:30 -
1 stop12h 55m
Mon 5/1013:09 -
1 stop11h 46m
Deal found 14/8£604
Mon 14/915:15 -
1 stop34h 43m
Sat 19/915:54 -
1 stop32h 31m
Deal found 17/8£605
Fri 2/1006:40 -
2 stops23h 02m
Sat 10/1014:25 -
2 stops22h 05m
Deal found 16/8£610
Wed 28/1006:30 -
1 stop13h 15m
Tue 3/1113:08 -
1 stop10h 47m
Deal found 16/8£612
Wed 23/908:40 -
2 stops16h 01m
Tue 6/1012:10 -
1 stop12h 20m
Deal found 13/8£612
Thu 12/1111:55 -
1 stop14h 24m
Mon 16/1112:58 -
1 stop17h 02m
Deal found 14/8£614
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 18 August 2026.
Thu 24/918:40 -
2 stops35h 02m
Mon 28/914:30 -
2 stops19h 30m
Deal found 17/8£601
Tue 29/914:50 -
1 stop14h 54m
Tue 6/1017:36 -
1 stop12h 19m
Deal found 15/8£657
Thu 24/912:05 -
1 stop14h 15m
Mon 28/912:10 -
2 stops12h 20m
Deal found 17/8£694
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 13/8£730
Thu 24/911:05 -
1 stop14h 36m
Mon 28/913:09 -
1 stop11h 46m
Deal found 13/8£685
Thu 1/1006:40 -
2 stops23h 02m
Fri 9/1014:25 -
2 stops19h 35m
Deal found 18/8£694
Wed 14/1016:25 -
Nonstop9h 05m
Sun 18/1019:10 -
1 stop13h 15m
Deal found 16/8£741
Sat 7/1109:00 -
2 stops16h 23m
Sat 21/1115:15 -
2 stops13h 35m
Deal found 17/8£690
Sun 18/1006:40 -
3 stops23h 14m
Wed 28/1017:35 -
2 stops23h 05m
Deal found 17/8£737
Wed 2/908:40 -
2 stops16h 36m
Wed 23/910:53 -
2 stops14h 22m
Deal found 15/8£698
Tue 1/907:25 -
2 stops15h 41m
Sat 31/1015:15 -
2 stops14h 10m
Deal found 14/8£789
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 18 August 2026.
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 17/8£629
Wed 30/916:25 -
Nonstop9h 05m
Wed 7/1021:35 -
Nonstop8h 00m
Deal found 16/8£691
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 17/8£696
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 13/8£709
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 14/8£722
Wed 2/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 17/8£740
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 18 August 2026 and is based on user searches.
Mon 14/915:15 -
1 stop34h 43m
Sat 19/915:54 -
1 stop32h 31m
Deal found 17/8£605
Mon 14/906:30 -
1 stop12h 55m
Mon 21/912:28 -
1 stop11h 27m
Deal found 17/8£612
Tue 15/909:45 -
1 stop16h 59m
Tue 29/912:46 -
1 stop14h 19m
Deal found 15/8£595
Tue 15/913:25 -
1 stop12h 33m
Tue 29/917:47 -
1 stop13h 18m
Deal found 15/8£597
Tue 15/918:05 -
2 stops22h 10m
Tue 29/913:25 -
1 stop14h 55m
Deal found 13/8£616
Wed 23/908:40 -
2 stops16h 01m
Tue 6/1012:10 -
1 stop12h 20m
Deal found 13/8£612
Wed 23/913:25 -
1 stop12h 33m
Fri 2/1016:59 -
1 stop31h 26m
Deal found 17/8£615
Thu 24/918:40 -
2 stops35h 02m
Mon 28/914:30 -
2 stops19h 30m
Deal found 13/8£598
Mon 28/906:30 -
1 stop12h 55m
Mon 5/1013:09 -
1 stop11h 46m
Deal found 14/8£604
Wed 30/912:15 -
1 stop14h 29m
Wed 7/1017:27 -
1 stop12h 48m
Deal found 16/8£596
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 18 August 2026.
Mon 2/1110:25 -
1 stop13h 44m
Deal found 14/8£322
Tue 10/1112:15 -
3 stops51h 25m
Deal found 13/8£365
Tue 17/1112:15 -
3 stops51h 25m
Deal found 17/8£370
Wed 4/1112:15 -
3 stops51h 25m
Deal found 17/8£371
Tue 20/1020:50 -
3 stops56h 23m
Deal found 18/8£372
Mon 9/1112:15 -
3 stops51h 25m
Deal found 13/8£377
Wed 11/1112:15 -
3 stops27h 25m
Deal found 15/8£379
Mon 16/1112:15 -
3 stops51h 25m
Deal found 15/8£382
Tue 13/1013:05 -
3 stops34h 35m
Deal found 14/8£387
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 18 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 18 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
Thu 24/9
18:40-23:42
2 stops35h 02m
Lambert-St Louis
Mon 28/9
14:30-16:00
2 stops19h 30m
£601
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Tue 29/9
14:50-23:44
1 stop14h 54m
Lambert-St Louis
Tue 6/10
17:36-11:55
1 stop12h 19m
£657
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 24/9
11:05-19:41
1 stop14h 36m
Lambert-St Louis
Mon 28/9
13:09-06:55
1 stop11h 46m
£685
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Sat 7/11
09:00-19:23
2 stops16h 23m
Lambert-St Louis
Sat 21/11
15:15-10:50
2 stops13h 35m
£690
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 24/9
12:05-20:20
1 stop14h 15m
Lambert-St Louis
Mon 28/9
12:10-06:30
2 stops12h 20m
£694
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 1/10
06:40-23:42
2 stops23h 02m
Lambert-St Louis
Fri 9/10
14:25-16:00
2 stops19h 35m
£694
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 2/9
08:40-19:16
2 stops16h 36m
Lambert-St Louis
Wed 23/9
10:53-07:15
2 stops14h 22m
£698
Fastest return journey
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 2/9
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Wed 23/9
21:35-11:35
Nonstop8h 00m
£730
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Sun 18/10
06:40-23:54
3 stops23h 14m
Lambert-St Louis
Wed 28/10
17:35-21:40
2 stops23h 05m
£737
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 14/10
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Sun 18/10
19:10-14:25
1 stop13h 15m
£741
Flights are sorted by cheapest return flights first.
Deals found on 14/8
Showing 1-10 of 22 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 70 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 £533). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £1,067). 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 18 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 £708 and £1,136 in September.The cheapest return price found within the last 5 days was £595 on Finnair (15 Sept–29 Sept).
How often are flights from London to St. Louis delayed?
About 14% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 117 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 Tuesday 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 14% 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 £370.
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 18 August 2026.
Get a feel of what it's like to fly with United Airlines,Virgin Atlantic, 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.
Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
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 14h 54m. 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 £219. Other airlines that can offer you cheap pricing are Aer Lingus, from £364, and Lufthansa, from £419. American Airlines is priced at 71% 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 £339. Users have also found prices from £354 and £398 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 £994, our data shows the cheapest flight currently is £722. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £516 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 £533). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £1,067). 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 18 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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