Cheap flights from London Heathrow Airport to St. Louis from £265
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 23/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
24 Sep — 1 Oct1
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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Best
Direct
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One-way
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 25 August 2026.
Wed 23/906:30 -
1 stop12h 55m
Sat 3/1019:01 -
1 stop10h 54m
Deal found 25/8£569
Thu 24/907:30 -
2 stops19h 39m
Thu 1/1013:29 -
1 stop13h 01m
Deal found 24/8£574
Wed 23/907:30 -
2 stops17h 44m
Fri 2/1012:20 -
1 stop16h 05m
Deal found 25/8£576
Fri 9/1006:30 -
1 stop12h 55m
Fri 16/1012:10 -
1 stop12h 20m
Deal found 25/8£576
Wed 23/906:30 -
1 stop12h 55m
Sat 3/1012:10 -
1 stop15h 50m
Deal found 25/8£579
Fri 13/1106:30 -
1 stop13h 15m
Sat 5/1219:00 -
1 stop11h 00m
Deal found 24/8£580
Wed 23/908:40 -
2 stops16h 01m
Fri 2/1012:10 -
1 stop15h 50m
Deal found 25/8£581
Thu 8/1019:30 -
1 stop23h 55m
Thu 15/1013:29 -
1 stop13h 01m
Deal found 24/8£581
Thu 8/1008:45 -
2 stops15h 56m
Thu 15/1014:40 -
2 stops16h 20m
Deal found 24/8£584
Fri 9/1008:40 -
2 stops16h 01m
Fri 16/1014:40 -
2 stops13h 20m
Deal found 25/8£586
Wed 23/908:40 -
2 stops16h 01m
Sat 3/1008:55 -
2 stops15h 35m
Deal found 25/8£587
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 25 August 2026.
Sat 24/1006:40 -
2 stops23h 14m
Wed 28/1017:35 -
2 stops23h 05m
Deal found 24/8£591
Wed 7/1006:30 -
1 stop12h 55m
Wed 14/1012:20 -
1 stop12h 55m
Deal found 23/8£631
Wed 7/1009:30 -
1 stop15h 11m
Wed 14/1009:30 -
1 stop14h 25m
Deal found 22/8£657
Wed 28/1011:45 -
2 stops16h 36m
Tue 3/1112:00 -
2 stops13h 45m
Deal found 20/8£659
Fri 9/1015:00 -
1 stop14h 59m
Fri 16/1021:35 -
Nonstop8h 00m
Deal found 25/8£719
Sat 14/1112:50 -
1 stop16h 04m
Fri 4/1213:15 -
1 stop12h 40m
Deal found 24/8£719
Fri 9/1006:40 -
3 stops23h 14m
Fri 16/1012:00 -
2 stops19h 35m
Deal found 25/8£595
Thu 8/1015:30 -
1 stop27h 55m
Mon 12/1012:20 -
1 stop12h 55m
Deal found 20/8£675
Thu 1/1007:05 -
3 stops22h 37m
Sat 10/1014:25 -
2 stops25h 15m
Deal found 20/8£655
Mon 7/911:45 -
2 stops18h 13m
Tue 15/910:05 -
2 stops15h 05m
Deal found 21/8£730
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 25 August 2026.
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 22/8£715
Sun 6/916:25 -
Nonstop9h 05m
Tue 22/921:35 -
Nonstop8h 00m
Deal found 22/8£728
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 20/8£730
Wed 16/916:25 -
Nonstop9h 05m
Wed 23/921:35 -
Nonstop8h 00m
Deal found 21/8£740
Sun 6/916:25 -
Nonstop9h 05m
Tue 22/921:35 -
Nonstop8h 00m
Deal found 22/8£746
Tue 15/916:25 -
Nonstop9h 05m
Tue 29/921:35 -
Nonstop8h 00m
Deal found 21/8£760
Sun 6/916:25 -
Nonstop9h 05m
Tue 15/921:35 -
Nonstop8h 00m
Deal found 21/8£767
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 25 August 2026 and is based on user searches.
Mon 21/906:30 -
1 stop12h 55m
Mon 28/912:20 -
1 stop11h 35m
Deal found 24/8£590
Mon 21/906:50 -
2 stops14h 48m
Mon 28/914:40 -
1 stop12h 55m
Deal found 24/8£592
Mon 21/906:40 -
2 stops23h 02m
Mon 28/914:30 -
2 stops19h 30m
Deal found 24/8£597
Wed 23/906:30 -
1 stop12h 55m
Sat 3/1019:01 -
1 stop10h 54m
Deal found 25/8£569
Wed 23/907:30 -
2 stops17h 44m
Fri 2/1012:20 -
1 stop16h 05m
Deal found 25/8£576
Wed 23/906:30 -
1 stop12h 55m
Sat 3/1012:10 -
1 stop15h 50m
Deal found 25/8£579
Wed 23/908:40 -
2 stops16h 01m
Sat 3/1012:10 -
1 stop15h 50m
Deal found 25/8£581
Wed 23/906:30 -
1 stop12h 55m
Fri 2/1012:10 -
1 stop12h 20m
Deal found 25/8£587
Thu 24/907:30 -
2 stops19h 39m
Thu 1/1013:29 -
1 stop13h 01m
Deal found 24/8£574
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 25 August 2026.
Wed 23/909:50 -
3 stops57h 20m
Deal found 21/8£265
Tue 22/912:00 -
3 stops31h 10m
Deal found 21/8£277
Thu 22/1012:00 -
3 stops35h 40m
Deal found 21/8£300
Fri 13/1107:50 -
3 stops41h 24m
Deal found 21/8£302
Wed 2/1220:45 -
3 stops40h 24m
Deal found 21/8£304
Sat 19/915:10 -
3 stops52h 00m
Deal found 21/8£325
Thu 17/915:10 -
3 stops58h 07m
Deal found 21/8£337
Fri 18/907:40 -
3 stops41h 37m
Deal found 21/8£351
Sat 14/1109:50 -
3 stops31h 29m
Deal found 21/8£355
Tue 20/1008:50 -
3 stops34h 31m
Deal found 21/8£357
Tue 17/1112:15 -
3 stops35h 25m
Deal found 24/8£362
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 25 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 7,457,451 searches. Data last updated 25 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
Sat 24/10
06:40-23:54
2 stops23h 14m
Lambert-St Louis
Wed 28/10
17:35-21:40
2 stops23h 05m
£591
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Fri 9/10
06:40-23:54
3 stops23h 14m
Lambert-St Louis
Fri 16/10
12:00-13:35
2 stops19h 35m
£595
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 7/10
06:30-13:25
1 stop12h 55m
Lambert-St Louis
Wed 14/10
12:20-07:15
1 stop12h 55m
£631
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 1/10
07:05-23:42
3 stops22h 37m
Lambert-St Louis
Sat 10/10
14:25-21:40
2 stops25h 15m
£655
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 7/10
09:30-18:41
1 stop15h 11m
Lambert-St Louis
Wed 14/10
09:30-05:55
1 stop14h 25m
£657
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 28/10
11:45-23:21
2 stops16h 36m
Lambert-St Louis
Tue 3/11
12:00-07:45
2 stops13h 45m
£659
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 8/10
15:30-13:25
1 stop27h 55m
Lambert-St Louis
Mon 12/10
12:20-07:15
1 stop12h 55m
£675
Fastest return journey
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Fri 9/10
15:00-23:59
1 stop14h 59m
Lambert-St Louis
Fri 16/10
21:35-11:35
Nonstop8h 00m
£719
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Sat 14/11
12:50-22:54
1 stop16h 04m
Lambert-St Louis
Fri 4/12
13:15-07:55
1 stop12h 40m
£719
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 7/9
11:45-23:58
2 stops18h 13m
Lambert-St Louis
Tue 15/9
10:05-07:10
2 stops15h 05m
£730
Flights are sorted by cheapest return flights first.
Deals found on 20/8
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 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 £529). Flying from London Heathrow Airport to St. Louis in August is currently the most expensive (average of £1,000). 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 25 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 £669 and £961 in September.The cheapest return price found within the last 5 days was £569 on Lufthansa (23 Sept–3 Oct).
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 47% 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 £368.
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 25 August 2026.
Get a feel of what it's like to fly with Finnair,United Airlines, andVirgin Atlantic 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.
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
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. 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 55m. 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 £389. Other airlines that can offer you cheap pricing are Lufthansa, from £417, and United Airlines, from £465. Aer Lingus is priced at 47% 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 £337. Users have also found prices from £352 and £395 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 £972, our data shows the cheapest flight currently is £696. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £574 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 £529). Flying from London Heathrow Airport to St. Louis in August is currently the most expensive (average of £1,000). 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 25 August 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 7,457,451 searches. Data last updated 25 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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