Cheap flights from London Heathrow Airport to St. Louis from £282
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 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
2 Jan — 9 Jan1
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 89 days in advance, depart on a Saturday or Tuesday and return on a Wednesday
Cheap flight deals from Heathrow to St. Louis
Enter your travel dates to find the best prices.
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 3 December 2025.
Wed 10/1214:10LHR - STL
1 stop12h 14mBritish Airways
Thu 8/112:11STL - LHR
1 stop12h 19mBritish Airways
Deal found 1/12£566
Thu 25/1209:55LHR - STL
1 stop15h 35mBritish Airways
Sun 18/118:44STL - LHR
1 stop10h 51mBritish Airways
Deal found 1/12£627
Wed 10/1212:35LHR - STL
1 stop13h 49mBritish Airways
Tue 6/114:54STL - LHR
1 stop22h 06mBritish Airways
Deal found 1/12£634
Tue 30/1211:05LHR - STL
1 stop17h 11mVirgin Atlantic
Tue 6/111:23STL - LHR
1 stop13h 42mVirgin Atlantic
Deal found 2/12£641
Thu 4/1207:50LHR - STL
2 stops17h 15mAer Lingus
Mon 8/1215:22STL - LHR
2 stops14h 03mAer Lingus
Deal found 1/12£657
Wed 17/1213:30LHR - STL
1 stop26h 01mFinnair
Wed 7/117:59STL - LHR
2 stops22h 11mFinnair
Deal found 1/12£673
Fri 5/1219:45LHR - STL
2 stops30h 53mAer Lingus
Mon 8/1213:59STL - LHR
2 stops15h 26mAer Lingus
Deal found 1/12£684
Thu 25/1208:40LHR - STL
2 stops18h 01mDelta
Sun 18/112:00STL - LHR
1 stop17h 40mDelta
Deal found 2/12£710
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 3 December 2025.
Mon 9/218:45LHR - STL
2 stops27h 29mBritish Airways
Sun 15/211:34STL - LHR
1 stop25h 26mBritish Airways
Deal found 2/12£496
Mon 12/111:45LHR - STL
1 stop12h 49mMultiple Airlines
Mon 26/111:55STL - LHR
1 stop16h 05mMultiple Airlines
Deal found 2/12£516
Tue 5/518:05LHR - STL
2 stops25h 44mFinnair
Tue 19/510:00STL - LHR
1 stop17h 25mFinnair
Deal found 2/12£516
Wed 4/211:00LHR - STL
1 stop13h 14mBritish Airways
Wed 11/215:20STL - LHR
1 stop10h 55mBritish Airways
Deal found 2/12£514
Wed 4/211:45LHR - STL
1 stop12h 49mBritish Airways
Sun 15/218:33STL - LHR
1 stop30h 22mBritish Airways
Deal found 2/12£514
Sun 10/516:20LHR - STL
2 stops35h 28mBritish Airways
Mon 18/506:05STL - LHR
1 stop18h 45mBritish Airways
Deal found 30/11£515
Sun 10/516:20LHR - STL
2 stops35h 28mBritish Airways
Tue 19/511:14STL - LHR
1 stop15h 51mBritish Airways
Deal found 30/11£515
Sun 10/518:45LHR - STL
2 stops33h 03mBritish Airways
Wed 20/509:15STL - LHR
1 stop16h 35mBritish Airways
Deal found 30/11£515
Tue 12/506:10LHR - STL
2 stops21h 38mBritish Airways
Tue 19/506:05STL - LHR
2 stops28h 15mBritish Airways
Deal found 30/11£517
Tue 13/106:05LHR - STL
2 stops18h 29mBritish Airways
Fri 23/111:05STL - LHR
1 stop17h 20mBritish Airways
Deal found 2/12£525
Wed 13/512:30LHR - STL
1 stop13h 33mBritish Airways
Tue 19/514:19STL - LHR
1 stop11h 31mBritish Airways
Deal found 30/11£526
Wed 13/516:25LHR - STL
Nonstop9h 05mBritish Airways
Mon 18/506:05STL - LHR
1 stop19h 15mBritish Airways
Deal found 30/11£543
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 3 December 2025.
Wed 22/416:25LHR - STL
Nonstop9h 05mBritish Airways
Tue 28/422:00STL - LHR
Nonstop8h 05mBritish Airways
Deal found 2/12£500
Wed 22/416:25LHR - STL
Nonstop9h 05mFinnair
Tue 28/422:00STL - LHR
Nonstop8h 05mFinnair
Deal found 2/12£522
Tue 5/516:25LHR - STL
Nonstop9h 05mBritish Airways
Tue 19/522:00STL - LHR
Nonstop8h 05mBritish Airways
Deal found 1/12£533
Tue 5/516:25LHR - STL
Nonstop9h 05mFinnair
Tue 19/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 2/12£547
Tue 12/516:25LHR - STL
Nonstop9h 05mBritish Airways
Tue 19/522:00STL - LHR
Nonstop8h 05mBritish Airways
Deal found 30/11£561
Fri 1/516:25LHR - STL
Nonstop9h 05mAmerican Airlines
Sun 10/522:00STL - LHR
Nonstop8h 05mAmerican Airlines
Deal found 1/12£582
Sun 10/516:25LHR - STL
Nonstop9h 05mFinnair
Tue 19/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 30/11£600
Tue 12/516:25LHR - STL
Nonstop9h 05mFinnair
Wed 20/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 30/11£616
Fri 1/516:25LHR - STL
Nonstop9h 05mMultiple Airlines
Sun 10/522:00STL - LHR
Nonstop8h 05mMultiple Airlines
Deal found 1/12£620
Sun 10/516:25LHR - STL
Nonstop9h 05mFinnair
Wed 20/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 30/11£647
Wed 13/516:25LHR - STL
Nonstop9h 05mFinnair
Wed 20/522:00STL - LHR
Nonstop8h 05mFinnair
Deal found 30/11£696
Sun 10/516:25LHR - STL
Nonstop9h 05mBritish Airways
Fri 22/522:00STL - LHR
Nonstop8h 05mBritish Airways
Deal found 30/11£884
Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 3 December 2025 and is based on user searches.
Mon 12/111:45LHR - STL
1 stop12h 49mBritish Airways
Mon 26/118:44STL - LHR
1 stop10h 51mBritish Airways
Deal found 1/12£515
Mon 12/111:45LHR - STL
1 stop12h 49mMultiple Airlines
Mon 26/111:55STL - LHR
1 stop16h 05mMultiple Airlines
Deal found 2/12£516
Mon 12/119:40LHR - STL
2 stops28h 36mIberia
Mon 26/109:33STL - LHR
1 stop16h 17mIberia
Deal found 1/12£532
Mon 12/111:45LHR - STL
2 stops17h 54mDelta
Mon 26/112:00STL - LHR
2 stops14h 45mDelta
Deal found 1/12£553
Tue 13/106:05LHR - STL
2 stops18h 29mBritish Airways
Fri 23/111:05STL - LHR
1 stop17h 20mBritish Airways
Deal found 2/12£525
Tue 13/115:35LHR - STL
2 stops28h 48mFinnair
Fri 23/106:00STL - LHR
1 stop19h 50mFinnair
Deal found 2/12£535
Thu 15/114:10LHR - STL
1 stop13h 05mBritish Airways
Thu 22/113:35STL - LHR
1 stop12h 40mBritish Airways
Deal found 1/12£545
Thu 15/110:45LHR - STL
2 stops28h 18mIberia
Thu 22/111:05STL - LHR
1 stop15h 10mIberia
Deal found 1/12£554
Fri 16/109:55LHR - STL
1 stop14h 39mBritish Airways
Fri 23/112:11STL - LHR
1 stop12h 49mBritish Airways
Deal found 2/12£555
Thu 22/108:25LHR - STL
2 stops20h 19mAmerican Airlines
Mon 26/117:04STL - LHR
1 stop13h 11mAmerican Airlines
Deal found 1/12£530
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 3 December 2025.
Fri 16/109:55LHR - STL
3 stops42h 39mMultiple Airlines
Deal found 1/12£282
Tue 12/506:50LHR - STL
2 stops14h 26mMultiple Airlines
Deal found 1/12£357
Tue 21/416:25LHR - STL
Nonstop9h 05mFinnair
Deal found 1/12£363
Tue 21/415:15LHR - STL
1 stop12h 33mMultiple Airlines
Deal found 1/12£371
Thu 12/207:30LHR - STL
2 stops20h 30mLufthansa
Deal found 2/12£384
Fri 23/106:30LHR - STL
1 stop13h 25mLufthansa
Deal found 1/12£386
Fri 23/107:30LHR - STL
2 stops16h 44mBritish Airways
Deal found 1/12£388
Fri 23/114:50LHR - STL
3 stops29h 56mMultiple Airlines
Deal found 1/12£390
Fri 16/109:30LHR - STL
2 stops20h 29mLufthansa
Deal found 1/12£395
Thu 16/408:20LHR - STL
1 stop13h 51mBritish Airways
Deal found 1/12£398
Thu 12/210:05LHR - STL
1 stop16h 12mMultiple Airlines
Deal found 2/12£401
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 3 December 2025.
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 3 December 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
Mon 9/2
18:45-16:14
2 stops27h 29m
Lambert-St Louis
Sun 15/2
11:34-19:00
1 stop25h 26m
£496
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 4/2
11:00-18:14
1 stop13h 14m
Lambert-St Louis
Wed 11/2
15:20-08:15
1 stop10h 55m
£514
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 4/2
11:45-18:34
1 stop12h 49m
Lambert-St Louis
Sun 15/2
18:33-06:55
1 stop30h 22m
£514
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sun 10/5
16:20-21:48
2 stops35h 28m
Lambert-St Louis
Mon 18/5
06:05-06:50
1 stop18h 45m
£515
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sun 10/5
16:20-21:48
2 stops35h 28m
Lambert-St Louis
Tue 19/5
11:14-09:05
1 stop15h 51m
£515
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sun 10/5
18:45-21:48
2 stops33h 03m
Lambert-St Louis
Wed 20/5
09:15-07:50
1 stop16h 35m
£515
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 12/1
11:45-18:34
1 stop12h 49m
Lambert-St Louis
Mon 26/1
11:55-10:00
1 stop16h 05m
£516
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 5/5
18:05-13:49
2 stops25h 44m
Lambert-St Louis
Tue 19/5
10:00-09:25
1 stop17h 25m
£516
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 12/5
06:10-21:48
2 stops21h 38m
Lambert-St Louis
Tue 19/5
06:05-16:20
2 stops28h 15m
£517
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 13/1
06:05-18:34
2 stops18h 29m
Lambert-St Louis
Fri 23/1
11:05-10:25
1 stop17h 20m
£525
Flights are sorted by cheapest return flights first.
Deals found on 1/12
Showing 1-10 of 23 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 28 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 89 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 £410). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £626). 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 3 December 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 17% 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 Tuesday evenings 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.
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 59% 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 £380.
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 3 December 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. 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 27h 29m. 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 £174. Other airlines that can offer you cheap pricing are KLM, from £511, and Finnair, from £517. American Airlines is priced at 76% 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 £548. Users have also found prices from £564 and £584 on Lufthansa and Virgin Atlantic, 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 £675, our data shows the cheapest flight currently is £634. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £502 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 £410). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £626). 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 3 December 2025.
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 3 December 2025.
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 858,174 searches. Data last updated 3 December 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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