$322+ 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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Sep 3 — Sep 101
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 April, booked 6 days in advance, depart on a Thursday or Monday and return on a Monday
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 August 4, 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 August 4, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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.
Wed 10/79:35 pm -
Nonstop8h 00m
Wed 10/214:25 pm -
Nonstop9h 05m
Deal found 7/30![British Airways logo]()
$964
This Delta deal was found by Cheapflights users on 8/1. 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 10/263:35 pm -
1 stop10h 30m
Thu 11/129:50 am -
1 stop12h 44m
Deal found 8/1![Delta logo]()
$965
This Cheapflightsfares deal was found by Cheapflights users on 8/1. 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.
Wed 10/71:29 pm -
2 stops17h 11m
Mon 10/127:30 pm -
2 stops31h 51m
Deal found 8/1![Lufthansa logo]()
$966
This Gotogate deal was found by Cheapflights users on 7/31. 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.
Fri 10/22:40 pm -
1 stop9h 55m
Fri 10/96:30 am -
1 stop12h 55m
Deal found 7/31![Multiple Airlines logo]()
$967
This United Airlines deal was found by Cheapflights users on 8/3. 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 8/314:50 pm -
1 stop31h 05m
Mon 9/79:30 am -
1 stop33h 55m
Deal found 8/3![United Airlines logo]()
$968
This Orbitz deal was found by Cheapflights users on 8/2. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2212:58 pm -
1 stop15h 02m
Mon 11/303:40 pm -
1 stop14h 23m
Deal found 8/2![British Airways logo]()
$969
This Expedia deal was found by Cheapflights users on 8/2. 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 10/294:05 pm -
1 stop11h 25m
Tue 11/109:30 am -
2 stops18h 22m
Deal found 8/2![Multiple Airlines logo]()
$970
This United Airlines deal was found by Cheapflights users on 8/1. 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 10/244:50 pm -
1 stop22h 45m
Tue 11/312:50 pm -
1 stop15h 02m
Deal found 8/1![United Airlines logo]()
$971
This Gotogate deal was found by Cheapflights users on 8/3. 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.
Thu 9/242:40 pm -
1 stop9h 55m
Wed 10/79:30 am -
1 stop15h 11m
Deal found 8/3![Multiple Airlines logo]()
$972
This Gotogate deal was found by Cheapflights users on 7/31. 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.
Thu 9/38:55 am -
1 stop20h 55m
Mon 9/77:30 pm -
1 stop23h 55m
Deal found 7/31![Multiple Airlines logo]()
$973
This Expedia deal was found by Cheapflights users on 7/31. 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.
Sun 10/412:10 pm -
1 stop12h 20m
Sat 10/177:30 pm -
1 stop23h 55m
Deal found 7/31![Multiple Airlines logo]()
$974
This Expedia deal was found by Cheapflights users on 8/1. 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.
Fri 10/164:21 pm -
1 stop11h 04m
Wed 10/214:25 pm -
Nonstop9h 05m
Deal found 8/1![British Airways logo]()
$975
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 August 4, 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 August 4, 2026.
This United Airlines deal was found by Cheapflights users on 8/1. 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 10/263:15 pm -
1 stop11h 40m
Tue 11/107:40 am -
1 stop12h 50m
Deal found 8/1![United Airlines logo]()
$965
This Delta deal was found by Cheapflights users on 7/31. 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 12/1610:00 am -
2 stops15h 15m
Thu 1/76:30 am -
2 stops20h 21m
Deal found 7/31![Delta logo]()
$969
This Icelandair deal was found by Cheapflights users on 7/31. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:30 am -
3 stops21h 25m
Thu 10/159:25 pm -
2 stops32h 10m
Deal found 7/31![Multiple Airlines logo]()
$1,029
This Delta deal was found by Cheapflights users on 8/1. 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.
Sat 10/3110:47 am -
2 stops16h 18m
Sun 11/88:40 am -
2 stops18h 11m
Deal found 8/1![Delta logo]()
$970
This United Airlines deal was found by Cheapflights users on 8/3. 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 8/316:54 pm -
2 stops29h 36m
Mon 9/79:30 am -
1 stop33h 55m
Deal found 8/3![United Airlines logo]()
$971
This Finnair deal was found by Cheapflights users on 8/2. 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 9/169:35 pm -
Nonstop8h 00m
Fri 9/2511:10 am -
1 stop11h 38m
Deal found 8/2![Multiple Airlines logo]()
$1,034
This United Airlines deal was found by Cheapflights users on 8/1. 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.
Fri 10/306:00 am -
1 stop10h 20m
Sat 11/710:25 am -
1 stop12h 26m
Deal found 8/1![United Airlines logo]()
$995
This Delta deal was found by Cheapflights users on 8/1. 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.
Thu 9/1712:00 pm -
1 stop13h 15m
Sat 9/266:30 am -
2 stops16h 02m
Deal found 8/1![Delta logo]()
$1,036
This United Airlines deal was found by Cheapflights users on 7/31. 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 10/175:36 pm -
1 stop33h 24m
Sat 10/313:00 pm -
1 stop30h 26m
Deal found 7/31![United Airlines logo]()
$999
This Delta deal was found by Cheapflights users on 8/1. 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.
Sat 10/1712:00 pm -
2 stops13h 10m
Sat 10/246:30 am -
2 stops14h 15m
Deal found 8/1![Delta logo]()
$1,040
This Delta deal was found by Cheapflights users on 8/3. 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 8/313:39 pm -
2 stops14h 26m
Mon 9/76:30 am -
2 stops14h 40m
Deal found 8/3![Delta logo]()
$1,045
Last-minute flights from St. Louis to HeathrowDiscover last-minute flight deals from St. Louis to Heathrow. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Heathrow. Data last updated August 4, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/3. 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 8/314:50 pm -
1 stop31h 05m
Mon 9/79:30 am -
1 stop33h 55m
Deal found 8/3![United Airlines logo]()
$968
This Gotogate deal was found by Cheapflights users on 7/31. 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.
Thu 9/38:55 am -
1 stop20h 55m
Mon 9/77:30 pm -
1 stop23h 55m
Deal found 7/31![Multiple Airlines logo]()
$973
This Expedia deal was found by Cheapflights users on 7/31. 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.
Sun 9/612:10 pm -
1 stop12h 20m
Sun 9/2011:05 am -
2 stops37h 36m
Deal found 7/31![Multiple Airlines logo]()
$965
This Mytrip deal was found by Cheapflights users on 8/1. 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 9/62:40 pm -
2 stops14h 30m
Sun 9/138:10 pm -
2 stops23h 15m
Deal found 8/1![Multiple Airlines logo]()
$977
This Delta deal was found by Cheapflights users on 8/4. 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 9/135:46 pm -
1 stop13h 29m
Tue 9/2211:15 am -
1 stop12h 25m
Deal found 8/4![Delta logo]()
$966
This Air Canada deal was found by Cheapflights users on 8/4. 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.
Sun 9/132:40 pm -
1 stop9h 55m
Tue 9/222:10 pm -
2 stops15h 28m
Deal found 8/4![Multiple Airlines logo]()
$978
This Gotogate deal was found by Cheapflights users on 8/3. 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.
Thu 9/172:40 pm -
1 stop9h 55m
Thu 9/242:10 pm -
1 stop12h 10m
Deal found 8/3![Multiple Airlines logo]()
$979
This Gotogate deal was found by Cheapflights users on 7/31. 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.
Wed 9/2312:10 pm -
1 stop12h 20m
Sun 9/277:30 pm -
1 stop23h 55m
Deal found 7/31![Multiple Airlines logo]()
$980
This Gotogate deal was found by Cheapflights users on 8/3. 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.
Thu 9/242:40 pm -
1 stop9h 55m
Wed 10/79:30 am -
1 stop15h 11m
Deal found 8/3![Multiple Airlines logo]()
$972
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 August 4, 2026.
Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This oojo deal was found by Cheapflights users on 8/3. 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.
Mon 11/21:15 pm -
1 stop11h 20m
Deal found 8/3![British Airways logo]()
$322
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 1/129:13 am -
2 stops18h 07m
Deal found 7/30![United Airlines logo]()
$325
This United Airlines deal was found by Cheapflights users on 8/3. 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 1/316:30 am -
2 stops18h 40m
Deal found 8/3![United Airlines logo]()
$328
This United Airlines deal was found by Cheapflights users on 7/30. 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 11/18:30 am -
1 stop15h 25m
Deal found 7/30![United Airlines logo]()
$329
This Air Canada deal was found by Cheapflights users on 7/30. 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.
Sat 10/314:05 pm -
1 stop33h 25m
Deal found 7/30![Air Canada logo]()
$333
This United Airlines deal was found by Cheapflights users on 8/1. 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 12/285:26 pm -
1 stop32h 29m
Deal found 8/1![United Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 10/52:29 pm -
3 stops41h 46m
Deal found 8/3![Multiple Airlines logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 8/317:58 pm -
3 stops38h 02m
Deal found 8/1![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 9/162:29 pm -
3 stops47h 51m
Deal found 7/31![Multiple Airlines logo]()
$357
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/302:29 pm -
3 stops41h 46m
Deal found 8/3![Multiple Airlines logo]()
$359
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 August 4, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $963 (Gotogate) |
One-way from | $322 (oojo) |
Popular in | June |
Cheapest in | October |
Average price | $993 |
Good round-trip deal | $977 or less |
Good one-way deal | $541 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 August 4, 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
Mon 10/26
3:15 pm-7:55 am
1 stop11h 40m
London Heathrow
Tue 11/10
7:40 am-2:30 pm
1 stop12h 50m
$965
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 12/16
10:00 am-7:15 am
2 stops15h 15m
London Heathrow
Thu 1/7
6:30 am-8:51 pm
2 stops20h 21m
$969
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sat 10/31
10:47 am-8:05 am
2 stops16h 18m
London Heathrow
Sun 11/8
8:40 am-8:51 pm
2 stops18h 11m
$970
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Mon 8/31
6:54 pm-6:30 am
2 stops29h 36m
London Heathrow
Mon 9/7
9:30 am-1:25 pm
1 stop33h 55m
$971
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Fri 10/30
6:00 am-9:20 pm
1 stop10h 20m
London Heathrow
Sat 11/7
10:25 am-4:51 pm
1 stop12h 26m
$995
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sat 10/17
5:36 pm-9:00 am
1 stop33h 24m
London Heathrow
Sat 10/31
3:00 pm-4:26 pm
1 stop30h 26m
$999
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 10/7
8:30 am-11:55 am
3 stops21h 25m
London Heathrow
Thu 10/15
9:25 pm-11:35 pm
2 stops32h 10m
$1,029
Quickest round-trip
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 9/16
9:35 pm-11:35 am
Nonstop8h 00m
London Heathrow
Fri 9/25
11:10 am-4:48 pm
1 stop11h 38m
$1,034
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Thu 9/17
12:00 pm-7:15 am
1 stop13h 15m
London Heathrow
Sat 9/26
6:30 am-4:32 pm
2 stops16h 02m
$1,036
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sat 10/17
12:00 pm-7:10 am
2 stops13h 10m
London Heathrow
Sat 10/24
6:30 am-2:45 pm
2 stops14h 15m
$1,040
Showing 1-10 of 19 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 August.
| 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 5 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 $653). 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 August 4, 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 21% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 131 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?
Friday tends to have the lowest number of delays on this route, whereas Wednesday 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 21% 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 August 4, 2026.
Get a feel of what it's like to fly with United Airlines,American Airlines, andAir Canada 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.
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Food
6.7
Overall
7.4
Crew
8.1
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Food
6.7
Overall
7.4
Crew
8.1
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Food
6.7
Overall
7.4
Crew
8.1
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Food
6.7
Overall
7.4
Crew
8.1
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Food
6.7
Overall
7.4
Crew
8.1
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Food
6.7
Overall
7.4
Crew
8.1
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
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
Wembley
Harrow
Eastleigh
Southend-on-Sea
Watford
Northampton
Dartford
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
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Other flights to Heathrow
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St. Louis and Heathrow flights
Browse other St. Louis and Heathrow flight options. Last updated on August 4, 2026.
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Top 9 airlines flying from St. Louis to Heathrow
Discover the top 9 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 August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$483 | Average$903 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$572 | Average$962 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$577 | Average$898 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$580 | Average$839 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$581 | Average$1,055 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$602 | Average$907 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$615 | Average$967 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$635 | Average$962 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$637 | Average$948 | FlexibilityNo cancel fee | On-time71% |