Cheap flights from London Heathrow Airport to St. Louis from £376
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 24/10. Fares are subject to change and may not be available on all flights or dates of travel.
Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or September, booked 26 days in advance, depart on a Wednesday 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 July 2025.
Round-trip from | £654 |
---|---|
One-way from | £376 |
Popular in | December |
Cheapest in | February |
Average price | £773 |
Find flight deals from Heathrow to St. Louis
Cheapest flights from Heathrow to St. LouisExplore 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 July 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 July 2025.
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 July 2025.
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
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 3/9
06:40-22:02
2 stops21h 22m
Lambert-St Louis
Wed 22/10
13:30-18:30
2 stops23h 00m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 2/9
16:00-23:44
1 stop13h 44m
Lambert-St Louis
Tue 9/9
07:08-06:20
2 stops17h 12m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sun 31/8
06:30-13:30
1 stop13h 00m
Lambert-St Louis
Tue 21/10
12:25-11:45
1 stop17h 20m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 25/11
06:00-23:44
2 stops23h 44m
Lambert-St Louis
Mon 1/12
12:31-10:50
2 stops40h 19m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 1/9
14:25-20:18
1 stop11h 53m
Lambert-St Louis
Mon 15/9
15:56-10:30
1 stop12h 34m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 25/8
06:50-20:00
2 stops19h 10m
Lambert-St Louis
Tue 9/9
13:30-06:30
1 stop11h 00m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 25/8
09:30-20:00
1 stop16h 30m
Lambert-St Louis
Tue 9/9
13:30-06:30
1 stop11h 00m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 25/8
06:30-16:06
2 stops15h 36m
Lambert-St Louis
Tue 9/9
10:20-08:50
2 stops16h 30m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/10
07:55-13:27
3 stops35h 32m
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 24/10
14:10-23:02
2 stops38h 52m
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.
Cheapflights Insights
Everything you need to know about your flight from London Heathrow Airport to St. Louis
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 27 June 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 26 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 £722). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £1,033). 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 July 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 morning.
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. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 July 2025.
Get a feel of what it's like to fly with Delta, Austrian Airlines, andUnited 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.
Boarding
Entertainment
Food
Comfort
Crew
Overall
Reviews
Michael,Jul 2025
AMS - ATL
Boarding
Entertainment
Food
Comfort
Crew
Overall
Reviews
Michael,Jul 2025
AMS - ATL
Boarding
Entertainment
Food
Comfort
Crew
Overall
Reviews
Michael,Jul 2025
AMS - ATL
Boarding
Entertainment
Food
Comfort
Crew
Overall
Reviews
Michael,Jul 2025
AMS - ATL
Boarding
Entertainment
Food
Comfort
Crew
Overall
Reviews
Michael,Jul 2025
AMS - ATL
Boarding
Entertainment
Food
Comfort
Crew
Overall
Reviews
Michael,Jul 2025
AMS - ATL
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.
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Alternative routes for Heathrow to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Top 10 airlines flying from Heathrow to St. Louis
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 July 2025.
Fly with Cheapflights
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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.