$314+ Cheap flights from St. Louis (STL) to Heathrow (LHR)
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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Jul 25 — Aug 11
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Heathrow 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or November, booked 50 days in advance, depart on a Thursday or Monday and return on a Wednesday
Cheap flight deals from St. Louis to Heathrow
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to HeathrowExplore the most affordable flight options available from St. Louis to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 25, 2026.
Explore the most affordable flight options available from St. Louis to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 25, 2026.
This Justfly.com deal was found by Cheapflights users on 6/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/252:40 pm
STL
- LHR
2 stops24h 20m
Air Canada
Sat 8/159:30 am
LHR
- STL
2 stops16h 54m
Air Canada
Deal found 6/23![Air Canada logo]()
$1,082
This Justfly.com deal was found by Cheapflights users on 6/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/91:30 pm
STL
- LHR
2 stops22h 10m
Scandinavian Airlines
Sun 11/156:40 am
LHR
- STL
2 stops22h 59m
Scandinavian Airlines
Deal found 6/23![Scandinavian Airlines logo]()
$1,083
This Justfly.com deal was found by Cheapflights users on 6/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/12:40 pm
STL
- LHR
2 stops24h 20m
Multiple Airlines
Sat 8/158:05 pm
LHR
- STL
2 stops28h 37m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$1,084
This Booking.com deal was found by Cheapflights users on 6/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/49:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Tue 8/181:10 pm
LHR
- STL
1 stop12h 17m
British Airways
Deal found 6/24![British Airways logo]()
$1,085
This Finnair deal was found by Cheapflights users on 6/22. 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.
Tue 9/84:50 pm
STL
- LHR
1 stop11h 40m
Finnair
Wed 9/164:25 pm
LHR
- STL
Nonstop9h 05m
Finnair
Deal found 6/22![Finnair logo]()
$1,088
This Kiwi.com deal was found by Cheapflights users on 6/23. 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.
Sat 11/218:40 am
STL
- LHR
2 stops17h 25m
Multiple Airlines
Sun 11/296:30 am
LHR
- STL
1 stop13h 15m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$1,089
This Scandinavian Airlines deal was found by Cheapflights users on 6/20. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/181:30 pm
STL
- LHR
2 stops20h 30m
Scandinavian Airlines
Fri 10/237:05 am
LHR
- STL
3 stops22h 34m
Scandinavian Airlines
Deal found 6/20![Scandinavian Airlines logo]()
$1,090
This British Airways deal was found by Cheapflights users on 6/23. 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 9/29:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Fri 9/1110:05 am
LHR
- STL
1 stop13h 19m
British Airways
Deal found 6/23![British Airways logo]()
$1,093
This Cheapflightsfares deal was found by Cheapflights users on 6/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/69:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Tue 10/134:25 pm
LHR
- STL
Nonstop9h 05m
British Airways
Deal found 6/21![British Airways logo]()
$1,094
This FlightHub deal was found by Cheapflights users on 6/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/253:55 pm
STL
- LHR
1 stop21h 00m
British Airways
Sat 8/159:15 am
LHR
- STL
1 stop15h 44m
British Airways
Deal found 6/23![British Airways logo]()
$1,095
Best flights from St. Louis to HeathrowDiscover carefully curated flight deals from St. Louis to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 25, 2026.
Discover carefully curated flight deals from St. Louis to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 25, 2026.
This Scandinavian Airlines deal was found by Cheapflights users on 6/24. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2211:51 am
STL
- LHR
2 stops23h 49m
Scandinavian Airlines
Fri 11/277:05 am
LHR
- STL
3 stops22h 34m
Scandinavian Airlines
Deal found 6/24![Scandinavian Airlines logo]()
$1,101
This British Airways deal was found by Cheapflights users on 6/23. 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 8/269:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Sun 9/68:55 am
LHR
- STL
1 stop15h 10m
British Airways
Deal found 6/23![British Airways logo]()
$1,143
This Delta deal was found by Cheapflights users on 6/24. 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.
Fri 7/2410:51 am
STL
- LHR
1 stop13h 34m
Delta
Fri 7/319:55 am
LHR
- STL
2 stops16h 42m
Delta
Deal found 6/24![Delta logo]()
$1,174
This Virgin Atlantic deal was found by Cheapflights users on 6/24. 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.
Sun 9/131:40 pm
STL
- LHR
1 stop11h 35m
Virgin Atlantic
Fri 9/189:40 am
LHR
- STL
2 stops16h 18m
Virgin Atlantic
Deal found 6/24![Virgin Atlantic logo]()
$1,176
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Wed 7/297:20 am
STL
- LHR
2 stops17h 10m
United Airlines
Mon 8/35:50 pm
LHR
- STL
2 stops27h 56m
United Airlines
Deal found 6/23![United Airlines logo]()
$1,225
This United deal was found by Cheapflights users on 6/23. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/234:48 pm
STL
- LHR
1 stop13h 37m
Multiple Airlines
Thu 7/306:00 am
LHR
- STL
2 stops18h 42m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$1,253
This Turkish Airlines deal was found by Cheapflights users on 6/23. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/168:00 am
STL
- LHR
2 stops31h 05m
Turkish Airlines
Tue 8/256:30 am
LHR
- STL
2 stops45h 30m
Turkish Airlines
Deal found 6/23![Turkish Airlines logo]()
$1,293
This British Airways deal was found by Cheapflights users on 6/20. 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 8/119:35 pm
STL
- LHR
Nonstop8h 00m
British Airways
Fri 8/214:25 pm
LHR
- STL
Nonstop9h 05m
British Airways
Deal found 6/20![British Airways logo]()
$1,157
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Wed 7/2912:10 pm
STL
- LHR
1 stop12h 20m
United Airlines
Sun 8/26:50 am
LHR
- STL
2 stops14h 56m
United Airlines
Deal found 6/23![United Airlines logo]()
$1,277
This Delta deal was found by Cheapflights users on 6/24. 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 7/1510:51 am
STL
- LHR
1 stop14h 24m
Delta
Tue 7/286:30 am
LHR
- STL
2 stops16h 54m
Delta
Deal found 6/24![Delta logo]()
$1,279
This British Airways deal was found by Cheapflights users on 6/21. 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.
Thu 9/1711:01 am
STL
- LHR
1 stop13h 49m
British Airways
Fri 10/24:25 pm
LHR
- STL
Nonstop9h 05m
British Airways
Deal found 6/21![British Airways logo]()
$1,213
Last-minute flights from St. Louis to HeathrowDiscover last-minute flight deals from St. Louis to Heathrow. Data last updated June 25, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Heathrow. Data last updated June 25, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 6/24. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:10 pm
STL
- LHR
1 stop12h 20m
Air Canada
Thu 10/158:45 am
LHR
- STL
2 stops15h 56m
Air Canada
Deal found 6/24![Air Canada logo]()
$1,158
This Cheapflightsfares deal was found by Cheapflights users on 6/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/33:30 pm
STL
- LHR
1 stop20h 10m
Lufthansa
Thu 10/157:30 pm
LHR
- STL
1 stop23h 55m
Lufthansa
Deal found 6/24![Lufthansa logo]()
$1,173
This FlightHub deal was found by Cheapflights users on 6/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/202:40 pm
STL
- LHR
1 stop11h 55m
Air Canada
Wed 7/298:40 am
LHR
- STL
2 stops16h 02m
Air Canada
Deal found 6/21![Air Canada logo]()
$1,172
This FlightHub deal was found by Cheapflights users on 6/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2112:10 pm
STL
- LHR
1 stop12h 20m
Air Canada
Tue 7/285:15 pm
LHR
- STL
2 stops31h 27m
Air Canada
Deal found 6/21![Air Canada logo]()
$1,167
This Delta deal was found by Cheapflights users on 6/24. 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 7/226:58 pm
STL
- LHR
1 stop12h 17m
Delta
Wed 7/296:30 am
LHR
- STL
2 stops14h 43m
Delta
Deal found 6/24![Delta logo]()
$1,174
This Justfly.com deal was found by Cheapflights users on 6/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/252:40 pm
STL
- LHR
2 stops24h 20m
Air Canada
Sat 8/159:30 am
LHR
- STL
2 stops16h 54m
Air Canada
Deal found 6/23![Air Canada logo]()
$1,082
This FlightHub deal was found by Cheapflights users on 6/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/253:55 pm
STL
- LHR
1 stop21h 00m
British Airways
Sat 8/159:15 am
LHR
- STL
1 stop15h 44m
British Airways
Deal found 6/23![British Airways logo]()
$1,095
This Justfly.com deal was found by Cheapflights users on 6/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/272:40 pm
STL
- LHR
1 stop11h 55m
Multiple Airlines
Tue 8/46:30 pm
LHR
- STL
1 stop24h 55m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$1,103
This Cheapflightsfares deal was found by Cheapflights users on 6/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/283:30 pm
STL
- LHR
1 stop21h 10m
Lufthansa
Tue 8/46:30 am
LHR
- STL
1 stop12h 55m
Lufthansa
Deal found 6/21![Lufthansa logo]()
$1,164
This FlightHub deal was found by Cheapflights users on 6/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2811:25 am
STL
- LHR
2 stops16h 35m
Multiple Airlines
Tue 8/48:05 pm
LHR
- STL
2 stops28h 37m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$1,171
One-way flights from St. Louis to HeathrowSearch for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated June 25, 2026.
Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated June 25, 2026.
This Mytrip deal was found by Cheapflights users on 6/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/412:10 pm
STL
- LHR
1 stop12h 20m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$314
This Mytrip deal was found by Cheapflights users on 6/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/2612:10 pm
STL
- LHR
1 stop12h 20m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$315
This oojo deal was found by Cheapflights users on 6/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:54 am
STL
- LHR
1 stop16h 16m
British Airways
Deal found 6/24![British Airways logo]()
$322
This Booking.com deal was found by Cheapflights users on 6/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:20 am
STL
- LHR
2 stops19h 15m
Air Canada
Deal found 6/21![Air Canada logo]()
$325
This Expedia deal was found by Cheapflights users on 6/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/302:40 pm
STL
- LHR
1 stop11h 55m
Air Canada
Deal found 6/21![Air Canada logo]()
$326
This Gotogate deal was found by Cheapflights users on 6/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2112:10 pm
STL
- LHR
1 stop12h 20m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$327
This FlightHub deal was found by Cheapflights users on 6/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2112:10 pm
STL
- LHR
1 stop15h 50m
Air Canada
Deal found 6/23![Air Canada logo]()
$328
This Delta deal was found by Cheapflights users on 6/21. 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.
Sun 9/201:01 pm
STL
- LHR
2 stops15h 39m
Delta
Deal found 6/21![Delta logo]()
$329
This Justfly.com deal was found by Cheapflights users on 6/20. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/202:40 pm
STL
- LHR
1 stop11h 55m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$331
This Air Canada deal was found by Cheapflights users on 6/21. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/41:13 pm
STL
- LHR
2 stops14h 47m
Air Canada
Deal found 6/21![Air Canada logo]()
$333
This United Airlines deal was found by Cheapflights users on 6/20. 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.
Sat 9/196:53 pm
STL
- LHR
1 stop29h 52m
United Airlines
Deal found 6/20![United Airlines logo]()
$335
This Air Canada deal was found by Cheapflights users on 6/21. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:55 am
STL
- LHR
2 stops19h 05m
Air Canada
Deal found 6/21![Air Canada logo]()
$336
Find flight deals from St. Louis to Heathrow
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Heathrow (LHR). 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 June 25, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $1,082 (Justfly.com) |
One-way from | $314 (Mytrip) |
Popular in | June |
Cheapest in | October |
Average price | $1,445 |
Good round-trip deal | $1,071 or less |
Good one-way deal | $374 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Heathrow 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 June 25, 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sun 11/22
11:51 am-5:40 pm
2 stops23h 49m
London Heathrow
Fri 11/27
7:05 am-11:39 pm
3 stops22h 34m
$1,101
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 8/26
9:35 pm-11:35 am
Nonstop8h 00m
London Heathrow
Sun 9/6
8:55 am-6:05 pm
1 stop15h 10m
$1,143
Quickest round-trip
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Tue 8/11
9:35 pm-11:35 am
Nonstop8h 00m
London Heathrow
Fri 8/21
4:25 pm-7:30 pm
Nonstop9h 05m
$1,157
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Fri 7/24
10:51 am-6:25 am
1 stop13h 34m
London Heathrow
Fri 7/31
9:55 am-8:37 pm
2 stops16h 42m
$1,174
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sun 9/13
1:40 pm-7:15 am
1 stop11h 35m
London Heathrow
Fri 9/18
9:40 am-7:58 pm
2 stops16h 18m
$1,176
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Thu 9/17
11:01 am-6:50 am
1 stop13h 49m
London Heathrow
Fri 10/2
4:25 pm-7:30 pm
Nonstop9h 05m
$1,213
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 7/29
7:20 am-6:30 am
2 stops17h 10m
London Heathrow
Mon 8/3
5:50 pm-3:46 pm
2 stops27h 56m
$1,225
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Thu 7/23
4:48 pm-12:25 pm
1 stop13h 37m
London Heathrow
Thu 7/30
6:00 am-6:42 pm
2 stops18h 42m
$1,253
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 7/29
12:10 pm-6:30 am
1 stop12h 20m
London Heathrow
Sun 8/2
6:50 am-3:46 pm
2 stops14h 56m
$1,277
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 7/15
10:51 am-7:15 am
1 stop14h 24m
London Heathrow
Tue 7/28
6:30 am-5:24 pm
2 stops16h 54m
$1,279
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Heathrow
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 St. Louis to Heathrow in June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on St. Louis-London Heathrow Airport flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from St. Louis-London Heathrow Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-London Heathrow Airport flights, Cheapflights users trust Ovago the most. Ovago 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 St. Louis-London Heathrow Airport 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 St. Louis to Heathrow
Have a flexible travel schedule? Discover the best time to fly to Heathrow from St. Louis with our price prediction graph.
STL-LHR
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 St. Louis to London Heathrow Airport
Prices
Delays
How far ahead should I book a flight from St. Louis to London Heathrow Airport?
To ensure you get the cheapest price possible for a flight from St. Louis to London Heathrow Airport, you should look to book at least 49 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 St. Louis to London Heathrow Airport?
Currently, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $648). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,445). 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 STL to LHR?
Find hourly flight availability from St. Louis to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 25, 2026.
When flying from St. Louis to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from St. Louis to London delayed?
About 26% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 129 minutes.
What is the most punctual flight time for St. Louis to London flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Wednesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on St. Louis to London flights?
Over the last year, British Airways have had the lowest number of delays on this route, with just 26% of flights being delayed.
Reviews of airlines servicing Heathrow
Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated June 25, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines from St. Louis to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Overall
7.8
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Heathrow. 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 London Heathrow Airport?
Book flights to London Heathrow Airport if you plan to visit one of these locationsIlford
Dorking
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Wembley
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Northampton
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Browse thousands of different options on Cheapflights for your next trip
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Complete your trip
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Search flights from St. Louis to Heathrow by cabin class
Find flights from St. Louis to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Heathrow
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 25, 2026.
St. Louis and Heathrow flights
Browse other St. Louis and Heathrow flight options. Last updated on June 25, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on June 25, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 8 airlines flying from St. Louis to Heathrow
Discover the top 8 airlines that operate flights from St. Louis to Heathrow. 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 June 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$483 | Average$867 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$529 | Average$800 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$529 | Average$683 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$532 | Average$893 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$572 | Average$899 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$572 | Average$803 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$576 | Average$953 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$635 | Average$962 | FlexibilityNo cancel fee | On-time76% |