Cheap flights from St. Louis to London Heathrow Airport from £238
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 30/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
27 Sep — 4 Oct1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or April, booked 6 days in advance, depart on a Wednesday or Tuesday and return on a Friday
Cheap flight deals from St. Louis to Heathrow
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Cheapest flights from St. Louis to Heathrow
Explore the most affordable flight options available from St. Louis to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2026.
Mon 30/1116:39 -
1 stop35h 01m
Thu 3/1207:30 -
2 stops17h 56m
Deal found 27/8£593
Tue 8/1216:05 -
1 stop10h 25m
Tue 15/1206:00 -
2 stops39h 26m
Deal found 24/8£622
Mon 30/1116:05 -
1 stop13h 15m
Fri 4/1208:45 -
2 stops19h 12m
Deal found 23/8£639
Mon 30/1117:55 -
1 stop34h 20m
Thu 3/1209:30 -
1 stop34h 15m
Deal found 27/8£640
Tue 8/1213:19 -
2 stops13h 51m
Tue 15/1206:35 -
2 stops18h 51m
Deal found 24/8£643
Mon 23/1116:05 -
1 stop32h 25m
Thu 24/1209:00 -
2 stops31h 42m
Deal found 23/8£647
Mon 23/1116:05 -
1 stop10h 25m
Wed 23/1213:00 -
2 stops35h 18m
Deal found 23/8£649
Mon 23/1118:50 -
2 stops15h 00m
Fri 25/1207:40 -
2 stops21h 58m
Deal found 23/8£650
Mon 23/1116:05 -
1 stop13h 15m
Tue 22/1218:00 -
2 stops35h 38m
Deal found 23/8£653
Wed 25/1113:08 -
2 stops13h 22m
Thu 24/1215:00 -
2 stops25h 42m
Deal found 23/8£656
Thu 3/1216:05 -
1 stop10h 25m
Mon 7/1220:05 -
2 stops49h 21m
Deal found 23/8£658
Best flights from St. Louis to Heathrow
Discover carefully curated flight deals from St. Louis to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 August 2026.
Thu 8/1012:10 -
1 stop15h 50m
Thu 15/1006:50 -
2 stops14h 53m
Deal found 24/8£727
Wed 23/916:59 -
1 stop14h 16m
Wed 30/906:30 -
2 stops14h 42m
Deal found 25/8£728
Wed 21/1010:14 -
2 stops14h 31m
Thu 29/1010:00 -
2 stops15h 51m
Deal found 27/8£728
Thu 17/912:00 -
2 stops24h 30m
Fri 2/1006:40 -
2 stops23h 02m
Deal found 24/8£775
Wed 7/1021:35 -
Nonstop8h 00m
Mon 12/1009:45 -
1 stop17h 12m
Deal found 23/8£811
Wed 11/1110:55 -
3 stops17h 55m
Sun 15/1112:15 -
2 stops17h 40m
Deal found 23/8£834
Fri 25/913:55 -
2 stops14h 35m
Fri 2/1009:55 -
2 stops16h 26m
Deal found 26/8£768
Sun 15/1112:20 -
2 stops23h 20m
Fri 20/1107:05 -
3 stops20h 28m
Deal found 23/8£800
Sat 26/915:54 -
1 stop15h 21m
Sat 3/1006:30 -
2 stops16h 02m
Deal found 27/8£801
Direct flights from St. Louis to Heathrow
Explore direct flight options from St. Louis to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 28 August 2026.
Wed 14/1021:35 -
Nonstop8h 00m
Wed 21/1016:25 -
Nonstop9h 05m
Deal found 27/8£779
Wed 7/1021:35 -
Nonstop8h 00m
Wed 21/1016:25 -
Nonstop9h 05m
Deal found 23/8£781
Tue 8/921:35 -
Nonstop8h 00m
Wed 16/916:25 -
Nonstop9h 05m
Deal found 27/8£804
Fri 16/1021:35 -
Nonstop8h 00m
Wed 21/1016:25 -
Nonstop9h 05m
Deal found 25/8£814
Wed 23/921:35 -
Nonstop8h 00m
Wed 30/916:25 -
Nonstop9h 05m
Deal found 24/8£822
Wed 7/1021:35 -
Nonstop8h 00m
Wed 14/1016:25 -
Nonstop9h 05m
Deal found 24/8£848
Last-minute flights from St. Louis to Heathrow
Discover last-minute flight deals from St. Louis to Heathrow. Data last updated 28 August 2026 and is based on user searches.
Wed 2/908:55 -
1 stop15h 40m
Tue 8/906:30 -
1 stop12h 55m
Deal found 23/8£762
Wed 2/908:55 -
1 stop15h 40m
Fri 11/908:40 -
2 stops16h 01m
Deal found 24/8£770
Wed 2/914:40 -
1 stop12h 55m
Tue 8/906:50 -
2 stops18h 21m
Deal found 23/8£775
Wed 2/908:55 -
1 stop18h 40m
Mon 7/908:30 -
1 stop34h 55m
Deal found 23/8£790
Wed 2/908:55 -
2 stops15h 35m
Tue 8/909:30 -
2 stops16h 50m
Deal found 23/8£800
Wed 2/906:00 -
2 stops21h 05m
Fri 11/908:50 -
2 stops17h 54m
Deal found 25/8£806
Mon 7/912:10 -
1 stop15h 50m
Wed 16/906:30 -
1 stop12h 55m
Deal found 24/8£751
Mon 7/912:10 -
1 stop15h 50m
Wed 16/908:40 -
2 stops16h 01m
Deal found 24/8£767
Mon 7/918:53 -
2 stops16h 12m
Mon 21/920:25 -
2 stops23h 00m
Deal found 24/8£777
One-way flights from St. Louis to Heathrow
Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated 28 August 2026.
Mon 30/1116:05 -
1 stop10h 25m
Deal found 23/8£238
Mon 23/1116:05 -
1 stop13h 15m
Deal found 24/8£241
Sun 21/206:30 -
2 stops18h 40m
Deal found 23/8£241
Sun 22/1118:50 -
2 stops19h 45m
Deal found 24/8£242
Sat 20/216:05 -
1 stop32h 25m
Deal found 23/8£245
Wed 2/1216:05 -
1 stop10h 25m
Deal found 25/8£252
Mon 22/213:08 -
2 stops18h 57m
Deal found 25/8£254
Mon 23/1113:20 -
2 stops16h 35m
Deal found 25/8£259
Wed 24/206:30 -
2 stops18h 40m
Deal found 28/8£260
Wed 25/1110:53 -
1 stop15h 02m
Deal found 27/8£260
Sat 28/1116:05 -
1 stop32h 25m
Deal found 27/8£263
Thu 10/1216:05 -
1 stop10h 25m
Deal found 23/8£270
Find flight deals from St. Louis to Heathrow
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Heathrow (LHR). 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 28 August 2026.
Customise your flight search to find flights from St. Louis to Heathrow 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 28 August 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Cheapest return flight
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Thu 8/10
12:10-10:00
1 stop15h 50m
London Heathrow
Thu 15/10
06:50-15:43
2 stops14h 53m
£727
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Wed 23/9
16:59-13:15
1 stop14h 16m
London Heathrow
Wed 30/9
06:30-15:12
2 stops14h 42m
£728
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Wed 21/10
10:14-06:45
2 stops14h 31m
London Heathrow
Thu 29/10
10:00-20:51
2 stops15h 51m
£728
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Fri 25/9
13:55-10:30
2 stops14h 35m
London Heathrow
Fri 2/10
09:55-20:21
2 stops16h 26m
£768
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Thu 17/9
12:00-18:30
2 stops24h 30m
London Heathrow
Fri 2/10
06:40-23:42
2 stops23h 02m
£775
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Sun 15/11
12:20-17:40
2 stops23h 20m
London Heathrow
Fri 20/11
07:05-21:33
3 stops20h 28m
£800
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Sat 26/9
15:54-13:15
1 stop15h 21m
London Heathrow
Sat 3/10
06:30-16:32
2 stops16h 02m
£801
Fastest return journey
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Wed 7/10
21:35-11:35
Nonstop8h 00m
London Heathrow
Mon 12/10
09:45-20:57
1 stop17h 12m
£811
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Wed 11/11
10:55-10:50
3 stops17h 55m
London Heathrow
Sun 15/11
12:15-23:55
2 stops17h 40m
£834
Cheapest one-way
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Tue 1/12
10:50-08:25
2 stops15h 35m
£242
Flights are sorted by cheapest return flights first.
Deals found on 23/8
Showing 1-10 of 20 resultsSorted by cheapest first
1
2
Best time to book a flight from St. Louis to Heathrow
Have a flexible travel schedule? Discover the best time to fly to Heathrow from St. Louis with our price prediction graph.
STL-LHR
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 St. Louis to London Heathrow Airport
Prices
Delays
More
How far ahead should I book a flight from St. Louis to London Heathrow Airport?
The best time to book flights from St. Louis to London Heathrow Airport is 5 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?
Currently, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £487). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £1,063). 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 STL to LHR?
Find hourly flight availability from St. Louis to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 August 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to London Heathrow Airport as you normally would.
How much does it cost for a return flight from St. Louis to London Heathrow Airport?
Airfare is typical for this route at the moment.
St. Louis to London Heathrow Airport flights typically cost between £541 and £823 in January.The cheapest return price found within the last 5 days was £553 on United Airlines (11 Jan–13 Jan).
How often are flights from St. Louis to London delayed?
About 22% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 118 minutes.
What is the most punctual flight time for St. Louis to London flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving at night 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 Wednesday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on St. Louis to London flights?
Over the past year, British Airways have had the lowest number of delays on this route, with just 22% of flights being delayed.
What’s the top stopover airport for flights from St. Louis to London Heathrow Airport?
Share of one-stop return flights from St. Louis to London Heathrow Airport chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Atlanta (ATL) – chosen by Cheapflights users on 67% of one-stop itineraries from St. Louis to London Heathrow Airport on Cheapflights.
What’s the cheapest stopover airport for flights from St. Louis to London Heathrow Airport?
Average return fare for one-stop flights from St. Louis to London Heathrow Airport, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Chicago (ORD) is the most affordable one-stop option, with an average return flight price of £439.
What’s the fastest stopover option from St. Louis to London Heathrow Airport?
Shortest average travel time for one-stop one-way flights from St. Louis to London Heathrow Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Atlanta (ATL) have the shortest average one-way travel time for one-stop routes: 11h 20m.
Which airport typically offers the quickest stopover for flights from St. Louis to London Heathrow Airport?
Average stopover duration for one-stop one-way flights from St. Louis to London Heathrow Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Atlanta (ATL) offer the fastest connection on this route, with an average stopover time of 1h 55m.
Reviews of airlines servicing Heathrow
Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 28 August 2026.
See what other customers who have flown with Virgin Atlantic and British Airways from St. Louis to London Heathrow Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Heathrow. 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 from for flights from St. Louis to London Heathrow?
Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London Heathrow. You should not have trouble finding flights to London Heathrow from Lambert-St Louis; the airport handles an average of 2 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 2 airlines have flights from the St. Louis airport to London Heathrow. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.
How long is the flight from St. Louis to London Heathrow Airport?
For as low as £728, United Airlines can have you in London Heathrow Airport from St. Louis in 14h 16m. There are 4186 mi between St. Louis and London Heathrow Airport. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?
British Airways, at £426, was found to be the cheapest airline from St. Louis to London Heathrow Airport. An alternate airline flying to your destination would be Virgin Atlantic. You may be able to fly from St. Louis to London Heathrow Airport for 39% less than the average price by searching for these airlines.
What are the most reliable airlines from St. Louis to London Heathrow Airport?
Before booking your flight to London Heathrow Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: American Airlines (71%), Aer Lingus (71%), Finnair( 71%).
What are the cheapest flights from St. Louis to London Heathrow Airport?
The cheapest flight price from St. Louis to London Heathrow Airport is £546. On average you can expect to pay £548. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for £573.
Can I find deals for business class flights from St. Louis to Heathrow?
Yes. Cheapflights offers flight deals from St. Louis to Heathrow 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 St. Louis to London Heathrow Airport?
Currently, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £487). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £1,063). 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 Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 28 August 2026.
Discover the top 2 airlines that operate flights from St. Louis to Heathrow. 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 28 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 St. Louis to Heathrow?
Cheapflights helps you search for flights from St. Louis to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
Why should you use Cheapflights to find cheap flight tickets from St. Louis to Heathrow?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from St. Louis to Heathrow.
Can Cheapflights find flights from St. Louis to Heathrow with no change fees?
Yes! Cheapflights helps users easily find flights from St. Louis to Heathrow with no change fees.
Can Cheapflights notify me if prices for flights from St. Louis to Heathrow become cheaper?
Not ready to book yet? You can track prices for flights from St. Louis to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.
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