$302+ 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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
feb. 20 — feb. 271
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 17 days in advance, depart on a Monday or Thursday and return on a Monday
Cheap flight deals from St. Louis to Heathrow
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 enero 21, 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 enero 21, 2026.
This Gurufare deal was found by Cheapflights users on 1/20. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/2012:27 pm
STL
- LHR
1 stop17h 43m
Finnair
dom. 4/264:25 pm
LHR
- STL
Nonstop9h 05m
Finnair
Deal found 1/20![Finnair logo]()
$639
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/94:05 pm
STL
- LHR
2 stops22h 30m
Multiple Airlines
lun. 2/2311:30 am
LHR
- STL
2 stops38h 53m
Multiple Airlines
Deal found 1/20![Multiple Airlines logo]()
$640
This United Airlines deal was found by Cheapflights users on 1/18. 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.
mar. 9/156:30 am
STL
- LHR
2 stops18h 00m
United Airlines
mar. 9/229:30 am
LHR
- STL
1 stop14h 47m
United Airlines
Deal found 1/18![United Airlines logo]()
$641
This Air Canada deal was found by Cheapflights users on 1/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/189:55 am
STL
- LHR
2 stops17h 25m
Air Canada
lun. 2/2311:10 am
LHR
- STL
2 stops39h 55m
Air Canada
Deal found 1/20![Air Canada logo]()
$642
This United Airlines deal was found by Cheapflights users on 1/19. 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.
mié. 4/226:15 am
STL
- LHR
2 stops18h 15m
United Airlines
mar. 5/56:50 am
LHR
- STL
2 stops15h 49m
United Airlines
Deal found 1/19![United Airlines logo]()
$644
This United Airlines deal was found by Cheapflights users on 1/19. 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.
mié. 4/226:05 pm
STL
- LHR
1 stop12h 15m
United Airlines
vie. 5/16:50 am
LHR
- STL
2 stops15h 49m
United Airlines
Deal found 1/19![United Airlines logo]()
$645
This United Airlines deal was found by Cheapflights users on 1/18. 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.
lun. 9/149:10 am
STL
- LHR
2 stops15h 20m
United Airlines
mié. 9/239:30 am
LHR
- STL
1 stop14h 47m
United Airlines
Deal found 1/18![United Airlines logo]()
$646
This Gotogate deal was found by Cheapflights users on 1/21. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/204:05 pm
STL
- LHR
1 stop11h 30m
Multiple Airlines
dom. 4/266:30 am
LHR
- STL
1 stop12h 55m
Multiple Airlines
Deal found 1/21![Multiple Airlines logo]()
$647
This United Airlines deal was found by Cheapflights users on 1/19. 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.
mié. 2/181:11 pm
STL
- LHR
1 stop12h 44m
United Airlines
dom. 2/226:50 am
LHR
- STL
2 stops15h 12m
United Airlines
Deal found 1/19![United Airlines logo]()
$648
This Air Canada deal was found by Cheapflights users on 1/21. 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.
lun. 3/304:05 pm
STL
- LHR
2 stops14h 55m
Air Canada
mié. 4/82:05 pm
LHR
- STL
2 stops31h 19m
Air Canada
Deal found 1/21![Air Canada logo]()
$649
This British Airways deal was found by Cheapflights users on 1/21. 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.
jue. 9/174:14 pm
STL
- LHR
1 stop12h 41m
British Airways
mar. 9/224:25 pm
LHR
- STL
Nonstop9h 05m
British Airways
Deal found 1/21![British Airways logo]()
$650
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 enero 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $639 (Gurufare) |
One-way from | $302 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $856 |
Good round-trip deal | $691 or less |
Good one-way deal | $459 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 enero 21, 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.
Fly from
St. Louis
Fly to
Heathrow
Route
Depart
Return
Price
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
lun. 4/27
9:10 am-8:30 am
1 stop17h 20m
London Heathrow
mar. 5/5
6:50 am-4:39 pm
2 stops15h 49m
$645
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
lun. 3/30
9:10 am-6:30 am
2 stops15h 20m
London Heathrow
mié. 4/8
10:50 am-9:08 pm
2 stops16h 18m
$646
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
mar. 4/21
2:29 pm-6:50 am
1 stop10h 21m
London Heathrow
dom. 4/26
4:25 pm-7:30 pm
Nonstop9h 05m
$650
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
mar. 3/17
8:17 am-5:55 am
1 stop16h 38m
London Heathrow
lun. 3/23
6:00 pm-3:29 pm
1 stop26h 29m
$656
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
vie. 3/6
11:25 am-7:55 am
1 stop14h 30m
London Heathrow
mar. 3/10
1:35 pm-9:07 pm
1 stop12h 32m
$658
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
mar. 5/5
11:43 am-7:15 am
2 stops13h 32m
London Heathrow
mar. 5/19
6:30 am-4:45 pm
2 stops16h 15m
$659
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
jue. 4/23
7:05 am-6:50 am
1 stop17h 45m
London Heathrow
jue. 4/30
12:15 pm-6:27 pm
1 stop12h 12m
$660
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
mar. 3/31
4:13 pm-10:55 am
1 stop12h 42m
London Heathrow
dom. 4/5
8:55 am-5:13 pm
1 stop14h 18m
$660
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
vie. 4/17
12:11 pm-9:05 am
1 stop14h 54m
London Heathrow
vie. 5/1
12:15 pm-6:27 pm
1 stop12h 12m
$660
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
vie. 4/17
12:11 pm-9:05 am
1 stop14h 54m
London Heathrow
mié. 4/29
12:15 pm-6:27 pm
1 stop12h 12m
$660
Showing 1-10 of 22 results
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >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 Expedia the most. Expedia 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.
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
More
How far ahead should I book a flight from St. Louis to London Heathrow Airport?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Heathrow. Price data was last updated on January 16, 2026.
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 17 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, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $516). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,000). 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.
How much does it cost to fly round-trip from St. Louis to London Heathrow Airport?
What’s the top layover airport for flights from St. Louis to London Heathrow Airport?
Share of 1-stop round-trip flights from St. Louis to London Heathrow Airport chosen by Cheapflights users in the past 12 months, using the same layover each way.
Chicago (ORD) – chosen by Cheapflights users on 57% of 1-stop itineraries from St. Louis to London Heathrow Airport on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to London Heathrow Airport?
Average round-trip fare for 1-stop flights from St. Louis to London Heathrow Airport, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Frankfurt am Main (FRA) is the most affordable 1-stop option, with an average round-trip price of $797.
What’s the fastest layover option from St. Louis to London Heathrow Airport?
Shortest average travel time for 1-stop one-way flights from St. Louis to London Heathrow Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 10h 06m.
Which airport typically offers the quickest layover for flights from St. Louis to London Heathrow Airport?
Average layover duration for 1-stop one-way flights from St. Louis to London Heathrow Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 31m.
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 enero 21, 2026.
Get a feel of what it's like to fly with United Airlines, American Airlines, and Air 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.
Crew
8.1
Food
6.6
Overall
7.4
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Crew
8.1
Food
6.6
Overall
7.4
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Crew
8.1
Food
6.6
Overall
7.4
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Crew
8.1
Food
6.6
Overall
7.4
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Crew
8.1
Food
6.6
Overall
7.4
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Crew
8.1
Food
6.6
Overall
7.4
Boarding
7.7
Comfort
7.3
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
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
Hounslow
Southend-on-Sea
Harrow
Croydon
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for St. Louis to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.
Top 10 airlines flying from St. Louis to Heathrow
Discover the top 10 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 enero 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$529 | Average$683 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$563 | Average$876 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$573 | Average$966 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$576 | Average$838 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$577 | Average$898 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$580 | Average$851 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$597 | Average$990 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$602 | Average$1,102 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$615 | Average$947 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$668 | Average$898 | FlexibilityNo cancel fee | On-time76% |