$340+ Cheap flights from St. Louis (STL) to Heathrow (LHR)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Nov 2 — Nov 91
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 April or March, 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 October 3, 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 October 3, 2026.
This Trip.com deal was found by Cheapflights users on 9/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:05 pm -
1 stop13h 15m
Wed 11/256:00 pm -
1 stop27h 26m
Deal found 9/30![Air Canada logo]()
$919
This Orbitz deal was found by Cheapflights users on 9/29. 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.
Tue 12/2910:00 am -
2 stops21h 30m
Sun 1/108:15 pm -
2 stops31h 32m
Deal found 9/29![Multiple Airlines logo]()
$935
This Mytrip deal was found by Cheapflights users on 9/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/144:26 pm -
2 stops23h 09m
Sat 11/216:00 am -
2 stops23h 59m
Deal found 9/30![Multiple Airlines logo]()
$950
This Expedia deal was found by Cheapflights users on 10/1. 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.
Wed 12/212:53 pm -
1 stop15h 07m
Wed 12/97:35 am -
2 stops17h 18m
Deal found 10/1![Iberia logo]()
$951
This Expedia deal was found by Cheapflights users on 9/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1812:29 pm -
1 stop13h 21m
Wed 11/2511:45 am -
2 stops18h 11m
Deal found 9/30![KLM logo]()
$955
This Expedia deal was found by Cheapflights users on 10/1. 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.
Wed 12/24:05 pm -
1 stop10h 25m
Wed 12/96:30 am -
1 stop13h 15m
Deal found 10/1![Multiple Airlines logo]()
$958
This FlightHub deal was found by Cheapflights users on 10/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3012:29 pm -
2 stops21h 31m
Fri 12/116:40 am -
2 stops23h 25m
Deal found 10/1![Scandinavian Airlines logo]()
$964
This Trip.com deal was found by Cheapflights users on 10/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/74:05 pm -
1 stop10h 25m
Mon 12/146:00 pm -
1 stop27h 26m
Deal found 10/3![Air Canada logo]()
$967
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 October 3, 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 October 3, 2026.
This United Airlines deal was found by Cheapflights users on 10/3. 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 1/115:06 pm -
1 stop12h 54m
Wed 1/136:50 am -
2 stops15h 28m
Deal found 10/3![United Airlines logo]()
$802
This Delta deal was found by Cheapflights users on 9/29. 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 12/22:17 pm -
2 stops14h 13m
Fri 12/116:30 am -
2 stops16h 50m
Deal found 9/29![Delta logo]()
$988
This Scandinavian Airlines deal was found by Cheapflights users on 10/3. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:33 pm -
2 stops21h 57m
Fri 12/117:05 am -
3 stops23h 00m
Deal found 10/3![Scandinavian Airlines logo]()
$988
This Virgin Atlantic deal was found by Cheapflights users on 9/29. 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 12/12:33 pm -
2 stops14h 07m
Wed 12/911:45 am -
2 stops14h 47m
Deal found 9/29![Virgin Atlantic logo]()
$988
This Icelandair deal was found by Cheapflights users on 9/29. 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.
Mon 10/261:00 pm -
2 stops16h 50m
Mon 11/28:35 pm -
2 stops31h 20m
Deal found 9/29![Multiple Airlines logo]()
$1,029
This Scandinavian Airlines deal was found by Cheapflights users on 10/2. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/262:25 pm -
2 stops20h 35m
Mon 11/27:05 am -
3 stops22h 49m
Deal found 10/2![Scandinavian Airlines logo]()
$1,018
This United Airlines deal was found by Cheapflights users on 9/29. 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 11/131:08 pm -
1 stop10h 47m
Fri 11/206:50 am -
2 stops18h 40m
Deal found 9/29![United Airlines logo]()
$1,033
This Delta deal was found by Cheapflights users on 10/1. 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 stops15h 28m
Sat 11/76:30 am -
2 stops15h 07m
Deal found 10/1![Delta logo]()
$1,088
This United Airlines deal was found by Cheapflights users on 10/1. 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.
Sun 11/151:08 pm -
1 stop10h 47m
Sun 11/2211:10 am -
2 stops16h 30m
Deal found 10/1![United Airlines logo]()
$1,034
This United Airlines deal was found by Cheapflights users on 10/3. 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.
Thu 2/1110:05 am -
1 stop18h 10m
Mon 2/153:00 pm -
1 stop30h 26m
Deal found 10/3![United Airlines logo]()
$1,054
Last-minute flights from St. Louis to HeathrowDiscover last-minute flight deals from St. Louis to Heathrow. Data last updated October 3, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Heathrow. Data last updated October 3, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 10/284:40 pm -
1 stop17h 05m
Wed 11/48:45 am -
2 stops20h 39m
Deal found 9/30![Lufthansa logo]()
$978
This Expedia deal was found by Cheapflights users on 9/29. 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.
Tue 11/101:20 pm -
1 stop15h 05m
Tue 11/177:30 am -
2 stops16h 47m
Deal found 9/29![Iberia logo]()
$980
This Mytrip deal was found by Cheapflights users on 9/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/144:26 pm -
2 stops23h 09m
Sat 11/216:00 am -
2 stops23h 59m
Deal found 9/30![Multiple Airlines logo]()
$950
This Trip.com deal was found by Cheapflights users on 10/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/164:05 pm -
1 stop10h 25m
Mon 11/236:00 pm -
1 stop27h 26m
Deal found 10/2![Air Canada logo]()
$969
This Trip.com deal was found by Cheapflights users on 9/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:05 pm -
1 stop13h 15m
Wed 11/256:00 pm -
1 stop27h 26m
Deal found 9/30![Air Canada logo]()
$919
This Expedia deal was found by Cheapflights users on 9/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1812:29 pm -
1 stop13h 21m
Wed 11/2511:45 am -
2 stops18h 11m
Deal found 9/30![KLM logo]()
$955
This KAYAK deal was found by Cheapflights users on 10/2. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/232:31 pm -
2 stops21h 59m
Sat 12/125:00 pm -
2 stops37h 05m
Deal found 10/2![Scandinavian Airlines logo]()
$968
This Gotogate deal was found by Cheapflights users on 10/3. 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.
Wed 11/254:05 pm -
1 stop13h 15m
Wed 12/166:30 am -
1 stop13h 15m
Deal found 10/3![Multiple Airlines logo]()
$972
This FlightHub deal was found by Cheapflights users on 10/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3012:29 pm -
2 stops21h 31m
Fri 12/116:40 am -
2 stops23h 25m
Deal found 10/1![Scandinavian Airlines logo]()
$964
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 October 3, 2026.
Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 3, 2026.
This Expedia deal was found by Cheapflights users on 10/1. 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.
Tue 3/309:35 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![British Airways logo]()
$340
This Expedia deal was found by Cheapflights users on 10/1. 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.
Wed 2/103:45 pm -
1 stop14h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![British Airways logo]()
$344
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Sun 3/289:40 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![British Airways logo]()
$346
This Mytrip deal was found by Cheapflights users on 9/29. 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.
Mon 2/14:05 pm -
1 stop10h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Multiple Airlines logo]()
$349
This Expedia deal was found by Cheapflights users on 10/1. 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.
Wed 2/101:45 pm -
2 stops19h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Iberia logo]()
$352
This United Airlines deal was found by Cheapflights users on 9/29. 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 3/306:30 am -
2 stops18h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![United Airlines logo]()
$353
This Delta deal was found by Cheapflights users on 9/29. 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 3/319:00 am -
1 stop15h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Delta logo]()
$354
This United Airlines deal was found by Cheapflights users on 9/29. 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 3/274:05 pm -
1 stop22h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![United Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 9/29. 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 12/287:15 pm -
1 stop29h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Delta logo]()
$366
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:58 pm -
2 stops41h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Multiple Airlines logo]()
$373
This Air Canada deal was found by Cheapflights users on 9/29. 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.
Mon 12/286:58 pm -
2 stops34h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Air Canada logo]()
$374
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 October 3, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $919 (Trip.com) |
One-way from | $340 (Expedia) |
Popular in | June |
Cheapest in | April |
Average price | $898 |
Good round-trip deal | $965 or less |
Good one-way deal | $526 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 7,457,451 searches. Data last updated October 3, 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 Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Tue 3/30
6:30 am-6:30 am
2 stops18h 00m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$353
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Mon 3/1
9:00 am-7:45 am
2 stops16h 45m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$354
Quickest round-trip
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Mon 3/1
11:25 am-6:40 am
2 stops13h 15m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$354
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Wed 12/30
7:18 am-6:40 am
2 stops17h 22m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$354
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Mon 3/29
10:23 am-7:15 am
2 stops14h 52m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$354
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Sat 3/27
4:05 pm-8:00 pm
1 stop22h 55m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$358
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Mon 12/28
7:15 pm-6:25 am
1 stop29h 10m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$366
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Thu 3/25
6:00 am-6:50 am
2 stops19h 50m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$404
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Fri 1/1
7:18 am-6:40 am
2 stops17h 22m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$404
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Thu 12/31
5:20 am-5:55 am
1 stop18h 35m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$404
Showing 1-10 of 20 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 October.
| 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, April is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $747). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,526). 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 October 3, 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 18% of weekly flights between St. Louis and London have experienced delays in the past year, with the average delay time being 114 minutes.
What is the most punctual flight time for St. Louis to London flights?
Historically, flights departing in the evening 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?
Monday 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 18% 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 October 3, 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.
Food
7.2
Entertainment
7.8
Comfort
7.8
Crew
8.5
Overall
7.8
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Entertainment
7.8
Comfort
7.8
Crew
8.5
Overall
7.8
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Entertainment
7.8
Comfort
7.8
Crew
8.5
Overall
7.8
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Entertainment
7.8
Comfort
7.8
Crew
8.5
Overall
7.8
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Entertainment
7.8
Comfort
7.8
Crew
8.5
Overall
7.8
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Entertainment
7.8
Comfort
7.8
Crew
8.5
Overall
7.8
Boarding
8.1
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
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
Gatwick
Hounslow
Wembley
Harrow
Southend-on-Sea
Basingstoke
Watford
Northampton
Dartford
Winchester
Croydon
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
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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 October 3, 2026.
St. Louis and Heathrow flights
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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 7,457,451 searches. Data last updated October 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$483 | Average$1,086 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$596 | Average$1,037 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$609 | Average$1,129 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$615 | Average$1,139 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$619 | Average$1,260 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$649 | Average$954 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$649 | Average$967 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$804 | Average$995 | FlexibilityNo cancel fee | On-time67% |