$430+ Cheap flights from Heathrow (LHR) to St. Louis (STL)
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 4/27. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
Apr 10 — Apr 171
Round-trip
1 adult, Economy
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Find cheap flights from Heathrow to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Best
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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 March 11, 2026.
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 March 11, 2026.
This TravelUp deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:15 am
LHR
- STL
1 stop12h 27m
British Airways
Wed 9/2312:47 pm
STL
- LHR
1 stop12h 08m
British Airways
Deal found 3/7![British Airways logo]()
$743
This TravelUp deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/224:25 pm
LHR
- STL
Nonstop9h 05m
British Airways
Tue 10/69:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Deal found 3/9![British Airways logo]()
$746
This ChecknFly deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:15 am
LHR
- STL
1 stop16h 18m
Finnair
Wed 9/239:46 am
STL
- LHR
1 stop16h 14m
Finnair
Deal found 3/10![Finnair logo]()
$747
This TravelUp deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:45 am
LHR
- STL
1 stop12h 56m
British Airways
Wed 4/298:03 pm
STL
- LHR
1 stop10h 12m
British Airways
Deal found 3/8![British Airways logo]()
$748
This ChecknFly deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:30 pm
LHR
- STL
1 stop12h 59m
Finnair
Tue 4/283:24 pm
STL
- LHR
1 stop11h 41m
Finnair
Deal found 3/9![Finnair logo]()
$750
This ChecknFly deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/412:15 pm
LHR
- STL
1 stop16h 09m
Finnair
Mon 5/186:54 pm
STL
- LHR
2 stops29h 31m
Finnair
Deal found 3/11![Finnair logo]()
$752
This Travcart deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2011:15 am
LHR
- STL
1 stop16h 04m
Virgin Atlantic
Thu 4/305:35 pm
STL
- LHR
1 stop13h 30m
Virgin Atlantic
Deal found 3/8![Virgin Atlantic logo]()
$753
This ChecknFly deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:05 pm
LHR
- STL
2 stops22h 49m
Finnair
Wed 4/295:49 pm
STL
- LHR
2 stops21h 51m
Finnair
Deal found 3/8![Finnair logo]()
$758
This TravelUp deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/196:10 pm
LHR
- STL
2 stops34h 07m
Finnair
Sun 4/265:21 pm
STL
- LHR
1 stop32h 19m
Finnair
Deal found 3/6![Finnair logo]()
$762
This TravelUp deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:10 pm
LHR
- STL
2 stops34h 07m
Finnair
Tue 4/2812:27 pm
STL
- LHR
1 stop19h 58m
Finnair
Deal found 3/6![Finnair logo]()
$765
Best flights from Heathrow to St. LouisDiscover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:30 am
LHR
- STL
2 stops16h 19m
Delta
Wed 9/231:30 pm
STL
- LHR
2 stops14h 50m
Delta
Deal found 3/9![Delta logo]()
$795
This Virgin Atlantic deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2111:20 am
LHR
- STL
2 stops15h 24m
Virgin Atlantic
Thu 4/3011:42 am
STL
- LHR
2 stops13h 03m
Virgin Atlantic
Deal found 3/6![Virgin Atlantic logo]()
$810
This British Airways deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/12:25 pm
LHR
- STL
1 stop14h 34m
British Airways
Mon 5/42:33 pm
STL
- LHR
1 stop11h 07m
British Airways
Deal found 3/9![British Airways logo]()
$828
This Finnair deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:10 pm
LHR
- STL
2 stops34h 07m
Finnair
Fri 5/15:21 pm
STL
- LHR
1 stop32h 19m
Finnair
Deal found 3/9![Finnair logo]()
$910
This British Airways deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/244:25 pm
LHR
- STL
Nonstop9h 05m
British Airways
Wed 4/299:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Deal found 3/9![British Airways logo]()
$844
This Delta deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/89:55 am
LHR
- STL
2 stops16h 47m
Delta
Tue 5/511:42 am
STL
- LHR
2 stops15h 08m
Delta
Deal found 3/10![Delta logo]()
$872
This British Airways deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/123:15 pm
LHR
- STL
1 stop14h 41m
British Airways
Sun 5/243:35 pm
STL
- LHR
1 stop21h 20m
British Airways
Deal found 3/10![British Airways logo]()
$868
This British Airways deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/109:45 am
LHR
- STL
1 stop12h 56m
British Airways
Sun 5/243:35 pm
STL
- LHR
1 stop21h 20m
British Airways
Deal found 3/10![British Airways logo]()
$908
This British Airways deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/812:00 pm
LHR
- STL
1 stop13h 30m
British Airways
Tue 5/59:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Deal found 3/10![British Airways logo]()
$918
Last-minute flights from Heathrow to St. LouisDiscover last-minute flight deals from Heathrow to St. Louis. Data last updated March 11, 2026 and is based on user searches.
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated March 11, 2026 and is based on user searches.
This TravelUp deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/196:10 pm
LHR
- STL
2 stops34h 07m
Finnair
Sun 4/265:21 pm
STL
- LHR
1 stop32h 19m
Finnair
Deal found 3/6![Finnair logo]()
$762
This ChecknFly deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/204:55 pm
LHR
- STL
1 stop22h 49m
Finnair
Thu 4/306:11 pm
STL
- LHR
1 stop11h 59m
Finnair
Deal found 3/10![Finnair logo]()
$747
This Travcart deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2011:15 am
LHR
- STL
1 stop16h 04m
Virgin Atlantic
Thu 4/305:35 pm
STL
- LHR
1 stop13h 30m
Virgin Atlantic
Deal found 3/8![Virgin Atlantic logo]()
$753
This TravelUp deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:10 pm
LHR
- STL
2 stops34h 07m
Finnair
Tue 4/2812:27 pm
STL
- LHR
1 stop19h 58m
Finnair
Deal found 3/6![Finnair logo]()
$765
This Billigflug deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/212:45 pm
LHR
- STL
1 stop13h 34m
British Airways
Tue 4/289:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Deal found 3/7![British Airways logo]()
$783
This TravelUp deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:45 am
LHR
- STL
1 stop12h 56m
British Airways
Wed 4/298:03 pm
STL
- LHR
1 stop10h 12m
British Airways
Deal found 3/8![British Airways logo]()
$748
This ChecknFly deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:30 pm
LHR
- STL
1 stop12h 59m
Finnair
Tue 4/283:24 pm
STL
- LHR
1 stop11h 41m
Finnair
Deal found 3/9![Finnair logo]()
$750
This ChecknFly deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/224:25 pm
LHR
- STL
Nonstop9h 05m
Finnair
Wed 4/295:21 pm
STL
- LHR
1 stop11h 09m
Finnair
Deal found 3/8![Finnair logo]()
$752
One-way flights from Heathrow to St. LouisSearch for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
Search for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2710:15 pm
LHR
- STL
3 stops38h 35m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$430
This Kiwi.com deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/297:45 pm
LHR
- STL
3 stops41h 05m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$459
This Kiwi.com deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1410:15 pm
LHR
- STL
3 stops38h 35m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$485
This TravelUp deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:10 pm
LHR
- STL
2 stops34h 09m
Finnair
Deal found 3/8![Finnair logo]()
$502
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:40 am
LHR
- STL
2 stops29h 45m
United Airlines
Deal found 3/6![United Airlines logo]()
$505
This Finnair deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/299:45 am
LHR
- STL
1 stop18h 32m
Finnair
Deal found 3/8![Finnair logo]()
$510
This Finnair deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/279:45 am
LHR
- STL
1 stop18h 32m
Finnair
Deal found 3/6![Finnair logo]()
$514
This British Airways deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/272:45 pm
LHR
- STL
1 stop15h 01m
British Airways
Deal found 3/6![British Airways logo]()
$518
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:40 am
LHR
- STL
2 stops18h 04m
Delta
Deal found 3/6![Delta logo]()
$523
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/299:55 am
LHR
- STL
2 stops17h 24m
Delta
Deal found 3/8![Delta logo]()
$526
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/269:30 am
LHR
- STL
2 stops41h 24m
United Airlines
Deal found 3/6![United Airlines logo]()
$531
This deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/28:00 am
LHR
- STL
1 stop15h 23m
United Airlines
Deal found 3/10![United Airlines logo]()
$532
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 March 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $743 (TravelUp) |
One-way from | $430 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $940 |
Good round-trip deal | $803 or less |
Good one-way deal | $589 or less |
Cheapflights Fare Finder
Customize 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 2,558,603 searches. Data last updated March 11, 2026.
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
Cheapest round-trip
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 9/2
6:30 am-4:49 pm
2 stops16h 19m
Lambert-St Louis
Wed 9/23
1:30 pm-10:20 am
2 stops14h 50m
$795
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 4/21
11:20 am-8:44 pm
2 stops15h 24m
Lambert-St Louis
Thu 4/30
11:42 am-6:45 am
2 stops13h 03m
$810
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 5/1
2:25 pm-10:59 pm
1 stop14h 34m
Lambert-St Louis
Mon 5/4
2:33 pm-7:40 am
1 stop11h 07m
$828
Quickest round-trip
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 4/24
4:25 pm-7:30 pm
Nonstop9h 05m
Lambert-St Louis
Wed 4/29
9:35 pm-11:35 am
Nonstop8h 00m
$844
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Tue 5/12
3:15 pm-11:56 pm
1 stop14h 41m
Lambert-St Louis
Sun 5/24
3:35 pm-6:55 pm
1 stop21h 20m
$868
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 4/8
9:55 am-8:42 pm
2 stops16h 47m
Lambert-St Louis
Tue 5/5
11:42 am-8:50 am
2 stops15h 08m
$872
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Sun 5/10
9:45 am-4:41 pm
1 stop12h 56m
Lambert-St Louis
Sun 5/24
3:35 pm-6:55 pm
1 stop21h 20m
$908
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Fri 4/24
6:10 pm-10:17 pm
2 stops34h 07m
Lambert-St Louis
Fri 5/1
5:21 pm-7:40 am
1 stop32h 19m
$910
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Wed 4/8
12:00 pm-7:30 pm
1 stop13h 30m
Lambert-St Louis
Tue 5/5
9:35 pm-11:35 am
Nonstop8h 00m
$918
Cheapest one-way
LondonSt. Louis
LHR - STL
LHRSTL
London Heathrow
Mon 4/27
8:40 am-8:44 pm
2 stops18h 04m
$523
Showing 1-10 of 19 resultsSorted by cheapest first
Compare providers for flights from Heathrow to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to St. Louis in March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars |
- Most accurate provider: When it comes to deals on London Heathrow Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on London Heathrow Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
LHR-STL
Estimated round-trip 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
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 round-trip flight from Heathrow to St. Louis. Price data was last updated on March 6, 2026.
The best time to book flights from London Heathrow Airport to St. Louis is 72 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 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 $544). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of $836). 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.
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 March 11, 2026.
Peruse reviews from past customers who have flown with United Airlines and British Airways from London Heathrow Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.1
Comfort
7.3
Food
6.6
Boarding
7.7
Crew
8.1
Overall
7.4
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Entertainment
7.1
Comfort
7.3
Food
6.6
Boarding
7.7
Crew
8.1
Overall
7.4
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Entertainment
7.1
Comfort
7.3
Food
6.6
Boarding
7.7
Crew
8.1
Overall
7.4
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
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Heathrow and St. Louis flights
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Top 2 airlines flying from Heathrow to St. Louis
Discover the top 2 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 2,558,603 searches. Data last updated March 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$555 | Average$821 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$654 | Average$857 | FlexibilityNo cancel fee | On-time69% |