$315+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
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 March, booked 11 days in advance, depart on a Thursday or Tuesday and return on a Thursday
Cheap 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 12, 2025.
Round-trip from | $738 (Air Canada) |
|---|---|
One-way from | $315 (Mytrip) |
Popular in | June |
Cheapest in | October |
Average price | $1,284 |
Find 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 June 12, 2025.
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 12, 2025.
This Air Canada deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/12. 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.
This Iberia deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Cheapflightsfares deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Gotogate deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Scandinavian Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Lufthansa deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Virgin Atlantic deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This KLM deal was found by Cheapflights users on 6/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Austrian Airlines deal was found by Cheapflights users on 6/12. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 12, 2025.
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
Price
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Tue 8/19
9:15 am-6:30 am
2 stops15h 15m
London Heathrow
Thu 8/28
6:50 am-3:21 pm
2 stops14h 31m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 8/20
1:26 pm-1:30 pm
1 stop18h 04m
London Heathrow
Wed 8/27
6:15 am-4:45 pm
2 stops16h 30m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Mon 7/14
5:27 pm-12:45 pm
1 stop13h 18m
London Heathrow
Mon 7/21
12:30 pm-8:24 pm
1 stop13h 54m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 9/3
4:05 pm-10:00 am
1 stop11h 55m
London Heathrow
Sun 9/7
6:50 am-7:57 pm
2 stops19h 07m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Fri 8/29
5:32 pm-2:25 pm
1 stop14h 53m
London Heathrow
Thu 9/4
10:50 am-11:48 pm
2 stops18h 58m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Thu 8/14
3:42 pm-4:00 pm
2 stops18h 18m
London Heathrow
Wed 8/20
7:05 am-10:02 pm
3 stops20h 57m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Mon 7/14
9:15 am-6:30 am
2 stops15h 15m
London Heathrow
Mon 7/21
8:30 am-6:07 pm
1 stop15h 37m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 9/10
3:30 pm-10:40 am
1 stop13h 10m
London Heathrow
Mon 9/22
6:30 pm-3:44 pm
2 stops27h 14m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Fri 7/25
7:11 pm-1:30 pm
1 stop12h 19m
London Heathrow
Fri 8/1
9:40 am-9:42 pm
2 stops18h 02m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 7/23
3:42 pm-11:10 am
1 stop13h 28m
London Heathrow
Sat 8/2
12:25 pm-11:20 pm
1 stop16h 55m
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.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to London Heathrow Airport
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 June 9, 2025.
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 11 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, November is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $661). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,108). 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 12, 2025.
One of the essential ways to save on airfare from St. Louis to London Heathrow Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 11% on airfare.
Rainfall in Heathrow by month
Plan your trip to Heathrow by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.
Temperature in Heathrow by month
Plan your trip to Heathrow by taking into account the average temperature totals by month.
If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).
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 12, 2025.
Get a feel of what it's like to fly with Delta, KLM and Austrian Airlines from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
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.
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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 June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$669 | Average$1,102 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$671 | Average$981 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$691 | Average$1,001 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$702 | Average$973 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$703 | Average$913 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$704 | Average$975 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$713 | Average$992 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$725 | Average$1,085 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$726 | Average$896 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$736 | Average$1,006 | FlexibilityNo cancel fee | On-time71% |