Cheap flights from London Heathrow Airport to St. Louis from £348

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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
4 Mar — 11 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or March, booked 89 days in advance, depart on a Thursday or Friday and return on a Monday

Cheap flight deals from Heathrow to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to St. Louis
Explore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 February 2026.

Mon 2/311:30
LHR
-
STL
2 stops18h 06m
Virgin Atlantic
Mon 16/313:39
STL
-
LHR
2 stops15h 36m
Virgin Atlantic
Deal found 1/2£497
Tue 17/309:55
LHR
-
STL
1 stop13h 57m
British Airways
Tue 24/314:06
STL
-
LHR
1 stop12h 14m
British Airways
Deal found 31/1£529
Tue 27/1020:25
LHR
-
STL
2 stops29h 12m
Virgin Atlantic
Mon 2/1117:30
STL
-
LHR
1 stop30h 55m
Virgin Atlantic
Deal found 31/1£535
Wed 18/309:55
LHR
-
STL
1 stop13h 12m
Finnair
Wed 25/310:33
STL
-
LHR
2 stops15h 27m
Finnair
Deal found 1/2£536
Tue 17/315:35
LHR
-
STL
2 stops24h 54m
Finnair
Tue 24/318:37
STL
-
LHR
1 stop10h 48m
Finnair
Deal found 31/1£537
Mon 4/509:20
LHR
-
STL
1 stop14h 24m
Virgin Atlantic
Sun 10/518:04
STL
-
LHR
1 stop31h 06m
Virgin Atlantic
Deal found 31/1£548
Wed 18/308:40
LHR
-
STL
2 stops19h 45m
Delta
Wed 25/312:04
STL
-
LHR
1 stop13h 21m
Delta
Deal found 1/2£550
Wed 18/309:55
LHR
-
STL
1 stop14h 35m
British Airways
Wed 25/316:13
STL
-
LHR
1 stop12h 47m
British Airways
Deal found 1/2£551
Tue 17/306:30
LHR
-
STL
2 stops16h 23m
Virgin Atlantic
Tue 24/312:28
STL
-
LHR
2 stops15h 17m
Virgin Atlantic
Deal found 31/1£552

Find flight deals from Heathrow to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to St. Louis (STL). 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 2 February 2026.

Round-trip from

£521

One-way from

£348

Popular in

August

Cheapest in

February

Average price

£551

Good round-trip deal

£566 or less
Virgin Atlantic
  • Virgin Atlantic
  • 2/3-16/3
  • 3 total stops
  • 29h 19m total
  • London to St. Louis
Lufthansa
  • Lufthansa
  • 15/4
  • 1 total stop
  • 12h 55m total
  • London to St. Louis
Highest demand for flights based on searches. 7% potential increase in price (£43 potential increase over avg. return price).
Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
Average for round-trip flights in February 2026
Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to St. Louis 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 858,174 searches. Data last updated 2 February 2026.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.

Fly from

Heathrow

Fly to

St. Louis

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/3

11:30-23:36

2 stops18h 06m

Lambert-St Louis

Mon 16/3

18:59-09:00

1 stop33h 01m

£499

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

15:35-11:29

2 stops24h 54m

Lambert-St Louis

Tue 24/3

18:37-10:25

1 stop10h 48m

£537

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

08:40-23:25

2 stops19h 45m

Lambert-St Louis

Wed 25/3

12:04-06:25

1 stop13h 21m

£550

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

06:30-17:53

2 stops16h 23m

Lambert-St Louis

Tue 24/3

12:28-07:05

1 stop13h 37m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

06:30-17:53

2 stops16h 23m

Lambert-St Louis

Tue 24/3

12:04-08:45

2 stops15h 41m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/3

11:45-23:36

2 stops17h 51m

Lambert-St Louis

Mon 16/3

10:50-06:55

2 stops15h 05m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 11/5

09:55-21:14

2 stops17h 19m

Lambert-St Louis

Thu 14/5

10:43-06:25

1 stop13h 42m

£561

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

08:40-20:42

2 stops18h 02m

Lambert-St Louis

Wed 13/5

10:43-06:45

1 stop14h 02m

£563

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 16/4

12:25-23:14

1 stop16h 49m

Lambert-St Louis

Thu 23/4

13:02-06:45

1 stop11h 43m

£567

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 15/4

08:40-21:08

2 stops18h 28m

£361

Flights are sorted by cheapest return flights first.

Deals found on 1/2

Showing 1-10 of 21 results
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Best time to book a flight from Heathrow to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Heathrow with our price prediction graph.
Estimated return 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 London Heathrow Airport to St. Louis

How far ahead should I book a flight from London Heathrow Airport to St. Louis?

Use this chart to determine the optimal time to book a return flight from Heathrow to St. Louis. Price data was last updated on 30 January 2026.

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to St. Louis, you should look to book at least 89 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 London Heathrow Airport to St. Louis?

Currently, September is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £397). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £594). 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.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 2 February 2026.
Get a feel of what it's like to fly with Finnair, United Airlines, andAir Canada from London Heathrow Airport to St. Louis 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

Crew

8.2

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Boarding

7.7

Crew

8.2

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Boarding

7.7

Crew

8.2

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Boarding

7.7

Crew

8.2

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Boarding

7.7

Crew

8.2

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Boarding

7.7

Crew

8.2

Food

6.7

Entertainment

6.9

Overall

7.6

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Related info for your journey

Find useful and relevant information for your journey from Heathrow to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly into for flights to St. Louis from London Heathrow?

    For a flight from London Heathrow to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 0 inbound flights from London Heathrow per day. 9 airlines have flights to Lambert-St Louis from London Heathrow on a regular basis.

  • How long is the flight from London Heathrow Airport to St. Louis?

    Departing from London Heathrow Airport to St. Louis will take you 18h 06m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London Heathrow Airport to St. Louis round-trip?

    Cheapflights users have booked flights from London Heathrow Airport to St. Louis round-trip from £167. Other airlines that can offer you cheap pricing are United Airlines, from £463, and British Airways, from £468. American Airlines is priced at 76% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from London Heathrow Airport to St. Louis one-way?

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as £336. Users have also found prices from £354 and £502 on Finnair and Virgin Atlantic, respectively.

  • What are the cheapest flights from London Heathrow Airport to St. Louis?

    While on average a flight from London Heathrow Airport to St. Louis is generally £664, our data shows the cheapest flight currently is £471. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £485 for that flight.

  • Can I find deals for flights from Heathrow to St. Louis that include hotel bookings?

    Yes. In addition to deals on Heathrow to St. Louis flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to St. Louis.

  • Can I find deals for business class flights from Heathrow to St. Louis?

    Yes. Cheapflights offers flight deals from Heathrow to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £397). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £594). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 9 airlines flying from Heathrow to St. Louis

Discover the top 9 airlines that operate flights from Heathrow to St. Louis. 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 858,174 searches. Data last updated 2 February 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£167Average£750FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest£463Average£721FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£468Average£753FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£493Average£808FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£498Average£629FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapest£544Average£842FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air CanadaCheapest£590Average£726FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
IberiaCheapest£641Average£714FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£646Average£785FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to St. Louis?

Cheapflights makes it easy to find Heathrow to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to St. Louis?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Louis from Heathrow.

Can Cheapflights find flights from Heathrow to St. Louis with no change fees?

Certainly. Search results for flights to St. Louis from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Heathrow to St. Louis become cheaper?

Yes, Cheapflights offers price alerts on Heathrow to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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