Cheap flights from London Heathrow Airport to St. Louis from £403
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
4 Dec — 11 Dec1
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 Wednesday and return on a Tuesday
Cheap flight deals from Heathrow to St. Louis
Enter your travel dates to find the best prices.
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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 4 November 2026.
Fri 4/1206:40 -
2 stops20h 58m
Mon 7/1212:36 -
2 stops21h 24m
Deal found 3/11£578
Mon 21/1206:40 -
2 stops21h 24m
Sun 17/115:48 -
2 stops18h 12m
Deal found 30/10£615
Tue 17/1117:00 -
2 stops36h 56m
Wed 25/1114:31 -
2 stops21h 09m
Deal found 1/11£617
Thu 12/1118:40 -
2 stops33h 02m
Mon 16/1114:31 -
2 stops21h 59m
Deal found 31/10£625
Fri 4/1210:50 -
2 stops30h 07m
Mon 7/1212:02 -
1 stop12h 23m
Deal found 3/11£632
Mon 7/1216:30 -
1 stop13h 32m
Mon 21/1218:57 -
1 stop31h 18m
Deal found 3/11£640
Thu 17/1213:35 -
1 stop16h 03m
Wed 23/1210:45 -
1 stop13h 10m
Deal found 30/10£640
Tue 1/1208:30 -
2 stops18h 53m
Tue 8/1216:05 -
1 stop10h 25m
Deal found 1/11£642
Tue 1/1213:30 -
1 stop30h 15m
Tue 8/1211:05 -
1 stop13h 15m
Deal found 1/11£646
Mon 7/1212:35 -
1 stop13h 23m
Tue 22/1208:06 -
1 stop18h 09m
Deal found 3/11£663
Wed 2/1206:30 -
1 stop13h 15m
Sun 6/1215:40 -
1 stop13h 05m
Deal found 2/11£668
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 4 November 2026.
Wed 27/119:30 -
2 stops33h 56m
Sun 31/110:13 -
2 stops25h 27m
Deal found 3/11£597
Tue 1/1217:30 -
1 stop26h 15m
Tue 8/1213:18 -
1 stop10h 37m
Deal found 2/11£686
Thu 12/1118:40 -
2 stops33h 02m
Mon 16/1114:31 -
2 stops21h 59m
Deal found 30/10£625
Wed 27/106:50 -
2 stops15h 28m
Sun 31/117:59 -
1 stop31h 41m
Deal found 3/11£687
Wed 2/1209:00 -
2 stops16h 26m
Sun 6/1209:40 -
2 stops15h 00m
Deal found 2/11£698
Thu 3/1206:35 -
2 stops17h 41m
Mon 7/1209:40 -
2 stops15h 00m
Deal found 3/11£705
Wed 16/1207:30 -
2 stops21h 29m
Wed 23/1205:05 -
1 stop24h 55m
Deal found 1/11£705
Tue 15/1209:30 -
1 stop34h 15m
Tue 22/1210:45 -
1 stop15h 10m
Deal found 31/10£750
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 4 November 2026.
Sat 24/414:00 -
Nonstop9h 00m
Tue 4/521:35 -
Nonstop8h 00m
Deal found 1/11£771
Thu 1/416:30 -
Nonstop9h 00m
Thu 8/421:25 -
Nonstop8h 10m
Deal found 3/11£893
Sun 28/316:25 -
Nonstop9h 05m
Sun 11/421:40 -
Nonstop8h 00m
Deal found 1/11£1,076
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 4 November 2026 and is based on user searches.
Thu 12/1118:40 -
2 stops33h 02m
Mon 16/1114:31 -
2 stops21h 59m
Deal found 30/10£625
Tue 17/1117:00 -
2 stops36h 56m
Wed 25/1114:31 -
2 stops21h 09m
Deal found 1/11£617
Tue 1/1208:30 -
2 stops18h 53m
Tue 8/1216:05 -
1 stop10h 25m
Deal found 1/11£642
Tue 1/1213:30 -
1 stop30h 15m
Tue 8/1211:05 -
1 stop13h 15m
Deal found 1/11£646
Wed 2/1206:30 -
1 stop13h 15m
Sun 6/1215:40 -
1 stop13h 05m
Deal found 2/11£668
Fri 4/1206:40 -
2 stops20h 58m
Mon 7/1212:36 -
2 stops21h 24m
Deal found 3/11£578
Fri 4/1210:50 -
2 stops30h 07m
Mon 7/1212:02 -
1 stop12h 23m
Deal found 3/11£632
Mon 7/1216:30 -
1 stop13h 32m
Mon 21/1218:57 -
1 stop31h 18m
Deal found 3/11£640
Mon 7/1212:35 -
1 stop13h 23m
Tue 22/1208:06 -
1 stop18h 09m
Deal found 3/11£663
Thu 17/1213:35 -
1 stop16h 03m
Wed 23/1210:45 -
1 stop13h 10m
Deal found 30/10£640
Mon 21/1206:40 -
2 stops21h 24m
Sun 17/115:48 -
2 stops18h 12m
Deal found 30/10£615
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 4 November 2026.
Tue 15/1208:15 -
3 stops33h 02m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£403
Mon 14/1213:40 -
3 stops40h 32m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 30/10£404
Fri 13/1120:50 -
3 stops56h 26m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£467
Tue 15/1206:30 -
2 stops16h 06m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£502
Tue 10/1106:00 -
3 stops39h 23m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£516
Mon 14/1216:20 -
1 stop33h 10m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 30/10£532
Sun 8/1108:50 -
2 stops19h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£537
Tue 10/1109:50 -
2 stops18h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£572
Fri 13/1109:50 -
2 stops18h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£642
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 4 November 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 4 November 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
Tue 15/12
08:15-11:17
3 stops33h 02m
Lambert-St Louis
Wed 31/12
00:00-07:00
Nonstop0h 00m
£403
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 14/12
13:40-00:12
3 stops40h 32m
Lambert-St Louis
Wed 31/12
00:00-07:00
Nonstop0h 00m
£404
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Tue 10/11
06:00-15:23
3 stops39h 23m
Lambert-St Louis
Wed 31/12
00:00-07:00
Nonstop0h 00m
£516
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Mon 14/12
16:20-19:30
1 stop33h 10m
Lambert-St Louis
Wed 31/12
00:00-07:00
Nonstop0h 00m
£532
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 27/1
19:30-23:26
2 stops33h 56m
Lambert-St Louis
Sun 31/1
10:13-17:40
2 stops25h 27m
£597
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 12/11
18:40-21:42
2 stops33h 02m
Lambert-St Louis
Mon 16/11
14:31-18:30
2 stops21h 59m
£625
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Tue 1/12
17:30-13:45
1 stop26h 15m
Lambert-St Louis
Tue 8/12
13:18-05:55
1 stop10h 37m
£686
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 27/1
06:50-16:18
2 stops15h 28m
Lambert-St Louis
Sun 31/1
17:59-07:40
1 stop31h 41m
£687
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Wed 2/12
09:00-19:26
2 stops16h 26m
Lambert-St Louis
Sun 6/12
09:40-06:40
2 stops15h 00m
£698
LondonSt. Louis
LHR London Heathrow - STL Lambert-St Louis
LHRSTL
London Heathrow
Thu 3/12
06:35-18:16
2 stops17h 41m
Lambert-St Louis
Mon 7/12
09:40-06:40
2 stops15h 00m
£705
Flights are sorted by cheapest return flights first.
Deals found on 1/11
Showing 1-10 of 16 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 £538). Flying from London Heathrow Airport to St. Louis in August is currently the most expensive (average of £1,088). 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?
Airfare is below average for this route at the moment.
London Heathrow Airport to St. Louis flights typically cost between £614 and £757 in December.The cheapest return price found within the last 5 days was £578 on Scandinavian Airlines (4 Dec–7 Dec).
How often are flights from London to St. Louis delayed?
About 15% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 110 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 15% 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.
Charlotte (CLT) is the most affordable one-stop option, with an average return flight price of £602.
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 Toronto (YYZ) have the shortest average one-way travel time for one-stop routes: 11h 47m.
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 Toronto (YYZ) offer the fastest connection on this route, with an average stopover time of 1h 29m.
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 4 November 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, 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.
First time flying with Virgin. It was everything I hoped it would be.
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. 10 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 26h 15m. 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 £304. Other airlines that can offer you cheap pricing are Lufthansa, from £424, and United Airlines, from £488. Air Canada is priced at 60% 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 £343. Users have also found prices from £358 and £666 on United Airlines and Finnair, 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 (63%), Aer Lingus (63%) and Finnair (63%).
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 £2,111, our data shows the cheapest flight currently is £659. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £578 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 £538). Flying from London Heathrow Airport to St. Louis in August is currently the most expensive (average of £1,088). 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 4 November 2026.
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 4 November 2026.
Discover the top 10 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 4 November 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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