Cheap flights from London Heathrow Airport to St. Louis from £356
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 27/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
12 Dec — 19 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 12 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 12 November 2025.
Mon 8/1206:30LHR - STL
2 stops15h 36mKLM
Mon 15/1214:38STL - LHR
1 stop12h 07mKLM
Deal found 10/11£531
Tue 9/1211:55LHR - STL
1 stop13h 34mFinnair
Tue 16/1206:00STL - LHR
1 stop19h 50mFinnair
Deal found 11/11£533
Mon 8/1206:30LHR - STL
2 stops15h 36mVirgin Atlantic
Mon 15/1210:45STL - LHR
2 stops14h 05mVirgin Atlantic
Deal found 10/11£547
Tue 9/1206:30LHR - STL
2 stops18h 03mDelta
Tue 16/1210:45STL - LHR
2 stops13h 40mDelta
Deal found 11/11£549
Mon 8/1206:30LHR - STL
2 stops16h 19mDelta
Mon 15/1214:38STL - LHR
2 stops15h 02mDelta
Deal found 10/11£549
Wed 10/1210:00LHR - STL
2 stops16h 47mVirgin Atlantic
Wed 17/1214:02STL - LHR
1 stop10h 23mVirgin Atlantic
Deal found 11/11£568
Mon 24/1106:30LHR - STL
2 stops18h 05mVirgin Atlantic
Mon 1/1211:39STL - LHR
1 stop12h 46mVirgin Atlantic
Deal found 10/11£568
Mon 24/1108:20LHR - STL
1 stop14h 07mBritish Airways
Mon 1/1214:17STL - LHR
1 stop11h 58mBritish Airways
Deal found 10/11£570
Wed 10/1208:20LHR - STL
1 stop14h 14mBritish Airways
Wed 17/1214:48STL - LHR
1 stop10h 12mBritish Airways
Deal found 11/11£572
Mon 24/1115:35LHR - STL
2 stops23h 45mFinnair
Sun 30/1118:45STL - LHR
1 stop32h 30mFinnair
Deal found 10/11£576
Wed 10/1215:50LHR - STL
1 stop27h 26mDelta
Wed 17/1214:02STL - LHR
1 stop10h 23mDelta
Deal found 11/11£581
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 12 November 2025.
Wed 22/409:15LHR - STL
1 stop13h 58mBritish Airways
Wed 6/518:29STL - LHR
1 stop11h 46mBritish Airways
Deal found 11/11£543
Tue 9/1206:30LHR - STL
2 stops18h 03mDelta
Tue 16/1210:45STL - LHR
2 stops13h 40mDelta
Deal found 11/11£549
Wed 22/416:25LHR - STL
Nonstop9h 05mFinnair
Wed 6/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 10/11£557
Wed 10/1210:00LHR - STL
2 stops16h 47mVirgin Atlantic
Wed 17/1214:02STL - LHR
1 stop10h 23mVirgin Atlantic
Deal found 11/11£568
Mon 8/1206:30LHR - STL
2 stops16h 19mDelta
Mon 15/1214:38STL - LHR
2 stops15h 02mDelta
Deal found 10/11£549
Tue 13/115:35LHR - STL
2 stops23h 28mFinnair
Fri 23/115:37STL - LHR
1 stop12h 23mFinnair
Deal found 10/11£569
Wed 7/112:40LHR - STL
2 stops16h 45mDelta
Wed 14/109:59STL - LHR
2 stops16h 06mDelta
Deal found 12/11£565
Wed 10/1206:30LHR - STL
2 stops16h 40mDelta
Wed 17/1214:02STL - LHR
1 stop10h 23mDelta
Deal found 11/11£568
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 12 November 2025.
Wed 22/416:25LHR - STL
Nonstop9h 05mFinnair
Wed 6/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 10/11£557
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 12 November 2025 and is based on user searches.
Mon 24/1106:30LHR - STL
2 stops18h 05mVirgin Atlantic
Mon 1/1211:39STL - LHR
1 stop12h 46mVirgin Atlantic
Deal found 10/11£568
Mon 24/1108:20LHR - STL
1 stop14h 07mBritish Airways
Mon 1/1214:17STL - LHR
1 stop11h 58mBritish Airways
Deal found 10/11£570
Mon 24/1115:35LHR - STL
2 stops23h 45mFinnair
Sun 30/1118:45STL - LHR
1 stop32h 30mFinnair
Deal found 10/11£576
Mon 8/1206:30LHR - STL
2 stops15h 36mKLM
Mon 15/1214:38STL - LHR
1 stop12h 07mKLM
Deal found 10/11£531
Mon 8/1206:30LHR - STL
2 stops15h 36mVirgin Atlantic
Mon 15/1210:45STL - LHR
2 stops14h 05mVirgin Atlantic
Deal found 10/11£547
Mon 8/1206:30LHR - STL
2 stops16h 19mDelta
Mon 15/1214:38STL - LHR
2 stops15h 02mDelta
Deal found 10/11£549
Tue 9/1211:55LHR - STL
1 stop13h 34mFinnair
Tue 16/1206:00STL - LHR
1 stop19h 50mFinnair
Deal found 11/11£533
Tue 9/1206:30LHR - STL
2 stops18h 03mDelta
Tue 16/1210:45STL - LHR
2 stops13h 40mDelta
Deal found 11/11£549
Wed 10/1210:00LHR - STL
2 stops16h 47mVirgin Atlantic
Wed 17/1214:02STL - LHR
1 stop10h 23mVirgin Atlantic
Deal found 11/11£568
Wed 10/1208:20LHR - STL
1 stop14h 14mBritish Airways
Wed 17/1214:48STL - LHR
1 stop10h 12mBritish Airways
Deal found 11/11£572
Wed 10/1215:50LHR - STL
1 stop27h 26mDelta
Wed 17/1214:02STL - LHR
1 stop10h 23mDelta
Deal found 11/11£581
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 12 November 2025.
Fri 27/214:50LHR - STL
2 stops48h 57mMultiple Airlines
Deal found 10/11£356
Tue 5/506:50LHR - STL
2 stops14h 26mMultiple Airlines
Deal found 10/11£357
Tue 5/516:25LHR - STL
Nonstop9h 05mFinnair
Deal found 10/11£362
Sun 15/215:30LHR - STL
2 stops32h 14mUnited Airlines
Deal found 11/11£371
Tue 9/1218:30LHR - STL
3 stops46h 37mMultiple Airlines
Deal found 10/11£379
Fri 27/210:35LHR - STL
1 stop18h 22mBritish Airways
Deal found 10/11£393
Fri 24/406:30LHR - STL
1 stop13h 00mLufthansa
Deal found 10/11£396
Sun 15/213:10LHR - STL
1 stop15h 58mMultiple Airlines
Deal found 11/11£401
Fri 21/1114:50LHR - STL
3 stops58h 08mMultiple Airlines
Deal found 10/11£402
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 12 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
Wed 22/4
09:15-17:13
1 stop13h 58m
Lambert-St Louis
Wed 6/5
18:29-12:15
1 stop11h 46m
£543
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 9/12
06:30-18:33
2 stops18h 03m
Lambert-St Louis
Tue 16/12
10:45-06:25
2 stops13h 40m
£549
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 8/12
06:30-16:49
2 stops16h 19m
Lambert-St Louis
Mon 15/12
14:38-11:40
2 stops15h 02m
£549
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 22/4
16:25-19:30
Nonstop9h 05m
Lambert-St Louis
Wed 6/5
22:00-12:05
Nonstop8h 05m
£557
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 7/1
12:40-23:25
2 stops16h 45m
Lambert-St Louis
Wed 14/1
09:59-08:05
2 stops16h 06m
£565
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 10/12
10:00-20:47
2 stops16h 47m
Lambert-St Louis
Wed 17/12
14:02-06:25
1 stop10h 23m
£568
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 10/12
06:30-17:10
2 stops16h 40m
Lambert-St Louis
Wed 17/12
14:02-06:25
1 stop10h 23m
£568
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 13/1
15:35-09:03
2 stops23h 28m
Lambert-St Louis
Fri 23/1
15:37-10:00
1 stop12h 23m
£569
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 5/5
06:50-15:16
2 stops14h 26m
£357
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 5/5
16:25-19:30
Nonstop9h 05m
£362
Flights are sorted by cheapest return flights first.
Deals found on 10/11
Showing 1-10 of 17 results
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.
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 7 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 £628). 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 12 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 12 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 9h 05m. 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 £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 flights from London Heathrow Airport to St. Louis?
While on average a flight from London Heathrow Airport to St. Louis is generally £682, 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 £523 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 £628). 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 12 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 12 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 12 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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