Cheap flights from London Heathrow Airport to St. Louis from £355
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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
19 Dec — 26 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 25 days in advance, depart on a Saturday or Monday and return on a Tuesday
Cheap 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 19 November 2025.
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 19 November 2025.
Thu 11/1212:15LHR - STL
2 stops26h 44mMultiple Airlines
Sun 14/1209:54STL - LHR
2 stops18h 56mMultiple Airlines
Deal found 17/11£559
Fri 5/1214:45LHR - STL
1 stop14h 21mBritish Airways
Wed 10/1214:48STL - LHR
1 stop12h 27mBritish Airways
Deal found 18/11£598
Sat 6/1214:45LHR - STL
1 stop12h 43mBritish Airways
Thu 11/1214:54STL - LHR
1 stop10h 06mBritish Airways
Deal found 18/11£598
Fri 5/1213:30LHR - STL
2 stops16h 29mFinnair
Wed 10/1214:48STL - LHR
2 stops12h 52mFinnair
Deal found 18/11£606
Sat 6/1211:05LHR - STL
1 stop18h 22mVirgin Atlantic
Thu 11/1210:45STL - LHR
2 stops14h 05mVirgin Atlantic
Deal found 18/11£611
Thu 11/1212:30LHR - STL
1 stop17h 12mVirgin Atlantic
Sun 14/1219:02STL - LHR
1 stop31h 58mVirgin Atlantic
Deal found 17/11£614
Mon 24/1109:50LHR - STL
2 stops19h 14mAer Lingus
Mon 1/1206:00STL - LHR
2 stops21h 05mAer Lingus
Deal found 17/11£614
Wed 3/1211:55LHR - STL
1 stop13h 34mBritish Airways
Thu 8/111:55STL - LHR
1 stop12h 55mBritish Airways
Deal found 17/11£624
Tue 25/1109:50LHR - STL
2 stops19h 25mAer Lingus
Thu 25/1209:08STL - LHR
2 stops16h 57mAer Lingus
Deal found 18/11£626
Thu 11/1207:05LHR - STL
3 stops19h 57mScandinavian Airlines
Sun 14/1213:57STL - LHR
2 stops22h 33mScandinavian Airlines
Deal found 17/11£632
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 19 November 2025.
Thu 8/114:45LHR - STL
1 stop14h 27mBritish Airways
Thu 29/112:11STL - LHR
1 stop12h 19mBritish Airways
Deal found 17/11£557
Mon 20/406:30LHR - STL
2 stops16h 19mDelta
Mon 27/409:00STL - LHR
1 stop15h 30mDelta
Deal found 17/11£565
Tue 21/414:25LHR - STL
1 stop14h 59mBritish Airways
Tue 28/416:39STL - LHR
1 stop11h 51mBritish Airways
Deal found 17/11£561
Mon 20/406:30LHR - STL
2 stops16h 19mDelta
Tue 28/412:10STL - LHR
1 stop19h 00mDelta
Deal found 17/11£565
Mon 20/415:15LHR - STL
1 stop14h 09mBritish Airways
Thu 23/411:14STL - LHR
1 stop14h 06mBritish Airways
Deal found 17/11£561
Wed 7/112:40LHR - STL
2 stops16h 45mDelta
Wed 14/109:59STL - LHR
2 stops16h 46mDelta
Deal found 18/11£565
Tue 21/409:15LHR - STL
1 stop12h 58mBritish Airways
Mon 27/416:39STL - LHR
1 stop11h 51mBritish Airways
Deal found 17/11£561
Mon 20/406:30LHR - STL
2 stops16h 19mDelta
Thu 23/413:30STL - LHR
2 stops15h 20mDelta
Deal found 17/11£565
Tue 21/413:45LHR - STL
1 stop12h 18mBritish Airways
Sun 26/418:29STL - LHR
1 stop30h 51mBritish Airways
Deal found 17/11£561
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 19 November 2025.
Tue 21/416:25LHR - STL
Nonstop9h 05mAmerican Airlines
Tue 28/422:00STL - LHR
Nonstop8h 05mAmerican Airlines
Deal found 17/11£557
Sun 19/416:25LHR - STL
Nonstop9h 05mBritish Airways
Tue 28/422:00STL - LHR
Nonstop8h 05mBritish Airways
Deal found 17/11£569
Sun 19/416:25LHR - STL
Nonstop9h 05mAmerican Airlines
Wed 22/422:00STL - LHR
Nonstop8h 05mAmerican Airlines
Deal found 17/11£587
Sun 19/416:25LHR - STL
Nonstop9h 05mAmerican Airlines
Fri 24/422:00STL - LHR
Nonstop8h 05mAmerican Airlines
Deal found 17/11£617
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 19 November 2025 and is based on user searches.
Mon 24/1109:50LHR - STL
2 stops19h 14mAer Lingus
Mon 1/1206:00STL - LHR
2 stops21h 05mAer Lingus
Deal found 17/11£614
Tue 25/1109:50LHR - STL
2 stops19h 25mAer Lingus
Thu 25/1209:08STL - LHR
2 stops16h 57mAer Lingus
Deal found 18/11£626
Wed 3/1211:55LHR - STL
1 stop13h 34mBritish Airways
Thu 8/111:55STL - LHR
1 stop12h 55mBritish Airways
Deal found 17/11£624
Fri 5/1214:45LHR - STL
1 stop14h 21mBritish Airways
Wed 10/1214:48STL - LHR
1 stop12h 27mBritish Airways
Deal found 18/11£598
Fri 5/1211:45LHR - STL
1 stop12h 59mFinnair
Wed 10/1214:48STL - LHR
2 stops12h 52mFinnair
Deal found 18/11£606
Sat 6/1214:45LHR - STL
1 stop12h 43mBritish Airways
Thu 11/1214:54STL - LHR
1 stop10h 06mBritish Airways
Deal found 18/11£598
Sat 6/1211:05LHR - STL
1 stop18h 22mVirgin Atlantic
Thu 11/1210:45STL - LHR
2 stops14h 05mVirgin Atlantic
Deal found 18/11£611
Thu 11/1212:15LHR - STL
2 stops26h 44mMultiple Airlines
Sun 14/1209:54STL - LHR
2 stops18h 56mMultiple Airlines
Deal found 17/11£559
Thu 11/1212:30LHR - STL
1 stop17h 12mVirgin Atlantic
Sun 14/1219:02STL - LHR
1 stop31h 58mVirgin Atlantic
Deal found 17/11£614
Thu 11/1207:05LHR - STL
3 stops19h 57mScandinavian Airlines
Sun 14/1213:57STL - LHR
2 stops22h 33mScandinavian Airlines
Deal found 17/11£632
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 19 November 2025.
Sat 7/309:55LHR - STL
3 stops53h 07mMultiple Airlines
Deal found 18/11£355
Wed 29/408:45LHR - STL
2 stops18h 18mUnited Airlines
Deal found 18/11£363
Wed 7/106:00LHR - STL
3 stops38h 48mMultiple Airlines
Deal found 18/11£367
Wed 7/116:00LHR - STL
1 stop13h 59mLufthansa
Deal found 18/11£370
Tue 14/415:15LHR - STL
1 stop12h 33mMultiple Airlines
Deal found 18/11£371
Sun 3/507:25LHR - STL
2 stops37h 56mLufthansa
Deal found 17/11£378
Sat 7/307:30LHR - STL
2 stops18h 00mBritish Airways
Deal found 18/11£385
Sat 7/309:45LHR - STL
1 stop18h 20mFinnair
Deal found 18/11£401
Sun 3/516:25LHR - STL
Nonstop9h 05mFinnair
Deal found 17/11£404
Thu 16/407:25LHR - STL
2 stops20h 54mUnited Airlines
Deal found 18/11£409
Cheapflights Fare Finder
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 19 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.
Fly from
Heathrow
Fly to
St. Louis
Route
Depart
Return
Price
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Thu 8/1
14:45-23:12
1 stop14h 27m
Lambert-St Louis
Thu 29/1
12:11-06:30
1 stop12h 19m
£557
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 21/4
14:25-23:24
1 stop14h 59m
Lambert-St Louis
Tue 28/4
16:39-10:30
1 stop11h 51m
£561
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 20/4
15:15-23:24
1 stop14h 09m
Lambert-St Louis
Thu 23/4
11:14-07:20
1 stop14h 06m
£561
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 21/4
09:15-16:13
1 stop12h 58m
Lambert-St Louis
Mon 27/4
16:39-10:30
1 stop11h 51m
£561
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 21/4
13:45-20:03
1 stop12h 18m
Lambert-St Louis
Sun 26/4
18:29-07:20
1 stop30h 51m
£561
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 20/4
06:30-16:49
2 stops16h 19m
Lambert-St Louis
Mon 27/4
09:00-06:30
1 stop15h 30m
£565
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 20/4
06:30-16:49
2 stops16h 19m
Lambert-St Louis
Tue 28/4
12:10-13:10
1 stop19h 00m
£565
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 7/1
12:40-23:25
2 stops16h 45m
Lambert-St Louis
Wed 14/1
09:59-08:45
2 stops16h 46m
£565
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 20/4
06:30-16:49
2 stops16h 19m
Lambert-St Louis
Thu 23/4
13:30-10:50
2 stops15h 20m
£565
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sat 7/3
09:55-09:02
3 stops53h 07m
£355
Flights are sorted by cheapest return flights first.
Deals found on 18/11
Showing 1-10 of 20 results
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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.
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 14 November 2025.
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 25 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 £412). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £629). 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 19 November 2025.
A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 18% on your trip compared to booking a flight in the afternoon.
What is the cheapest day to fly from London Heathrow Airport to St. Louis?
Use this chart to determine the cheapest time to fly return from Heathrow to St. Louis. Price data was last updated on 16 December 2024.
Travellers seeking maximum savings on their London Heathrow Airport to St. Louis flight should consider departing on Sunday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
How much does it cost for a return flight from London Heathrow Airport to St. Louis?
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 60% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.
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.
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 19 November 2025.
Get a feel of what it's like to fly with Finnair, United Airlines, andIberia 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.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
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 14h 27m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi.
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 £89. Other airlines that can offer you cheap pricing are Scandinavian Airlines, from £489, and KLM, from £513. American Airlines is priced at 88% 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 Finnair. According to our data, you can fly for as low as £363. Users have also found prices from £363 and £363 on United Airlines and Lufthansa, 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 £683, our data shows the cheapest flight currently is £463. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £545 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 £412). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £629). 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 19 November 2025.
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 19 November 2025.
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 858,174 searches. Data last updated 19 November 2025.
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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