Which airport typically offers the quickest stopover for flights from London Heathrow Airport to St. Louis?

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

What’s the cheapest stopover airport for flights from London Heathrow Airport to St. Louis?

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £368.

What’s the top stopover airport for flights from London Heathrow Airport to St. Louis?

Chicago (ORD) – chosen by Cheapflights users on 61% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.

What’s the fastest stopover option from London Heathrow Airport to St. Louis?

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 11h 05m.

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

Departing from London Heathrow Airport to St. Louis will take you 17h 43m. 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 £168. Other airlines that can offer you cheap pricing are United Airlines, from £465, and British Airways, from £471. 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 £337. Users have also found prices from £352 and £356 on United Airlines and Finnair, respectively.

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 inches per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

If weather is an important factor for your trip to St. Louis, 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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

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 £668, 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 £564 for that flight.

What are the most popular airlines that fly from London Heathrow Airport to St. Louis?

Before booking your flight from London Heathrow Airport to St. Louis check out the most popular airlines for this route: British Airways, Finnair or Lufthansa.

What is the cheapest time of day to fly from LHR to STL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to St. Louis as you normally would.

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.

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.

£353+ Cheap Flights from London Heathrow Airport to St. Louis

Q: How much does it cost for a return flight from London Heathrow Airport to St. Louis?

Airfare is typical for this route at the moment. London Heathrow Airport to St. Louis flights typically cost between £470 and £649 in April. The cheapest return flight price found within the last 3 days was £548 on British Airways (20 Apr-30 Apr).

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

Best

Direct

Last-minute

One-way

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 14 February 2026.

Tue 1/916:25

LHR

STL

Nonstop9h 05m

Finnair

Tue 22/916:14

STL

LHR

1 stop16h 11m

Finnair

Deal found 14/2£534

Tue 1/912:00

LHR

STL

1 stop13h 23m

British Airways

Tue 22/912:47

STL

LHR

1 stop12h 08m

British Airways

Deal found 11/2£542

Mon 20/406:15

LHR

STL

2 stops19h 14m

British Airways

Thu 30/407:05

STL

LHR

1 stop18h 35m

British Airways

Deal found 14/2£548

Mon 16/310:00

LHR

STL

2 stops18h 58m

Delta

Mon 23/313:39

STL

LHR

2 stops15h 36m

Delta

Deal found 14/2£551

Mon 16/311:45

LHR

STL

2 stops17h 13m

Delta

Mon 30/306:29

STL

LHR

1 stop24h 36m

Delta

Deal found 12/2£552

Mon 16/311:15

LHR

STL

1 stop17h 43m

Finnair

Mon 23/311:22

STL

LHR

1 stop19h 43m

Finnair

Deal found 14/2£553

Mon 16/311:15

LHR

STL

1 stop17h 43m

Finnair

Mon 30/311:22

STL

LHR

1 stop15h 38m

Finnair

Deal found 12/2£558

Find flight deals from Heathrow to St. Louis

Round-trip from	£548
One-way from	£353
Popular in	July
Cheapest in	February
Average price	£530
Good round-trip deal	£597 or less

British Airways
20/4-30/4
3 total stops
37h 49m total
London to St. Louis

Search Deals

27/4
3 total stops
39h 25m total
London to St. Louis

Search Deals

Highest demand for flights based on searches. 8% potential increase in price (£52 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2026

Search Deals

Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

06:15-19:29

2 stops19h 14m

Lambert-St Louis

Thu 30/4

07:05-07:40

1 stop18h 35m

£548

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 16/3

10:00-23:58

2 stops18h 58m

Lambert-St Louis

Mon 23/3

12:04-11:40

1 stop18h 36m

£551

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 16/3

11:45-23:58

2 stops17h 13m

Lambert-St Louis

Mon 30/3

10:12-07:10

2 stops14h 58m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 16/3

11:15-23:58

1 stop17h 43m

Lambert-St Louis

Mon 23/3

11:22-12:05

1 stop19h 43m

£553

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 29/4

08:40-20:42

2 stops18h 02m

Lambert-St Louis

Wed 20/5

18:57-14:35

2 stops13h 38m

£564

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 5/5

06:30-16:50

2 stops16h 20m

Lambert-St Louis

Tue 19/5

10:15-06:45

2 stops14h 30m

£566

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

10:45-23:13

2 stops18h 28m

Lambert-St Louis

Thu 30/4

10:50-06:45

2 stops13h 55m

£575

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 30/4

21:50-19:29

2 stops27h 39m

Lambert-St Louis

Thu 7/5

11:45-08:00

1 stop14h 15m

£578

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 30/4

10:30-21:23

2 stops16h 53m

Lambert-St Louis

Thu 7/5

11:25-08:00

2 stops14h 35m

£578

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 14/5

20:50-19:12

3 stops52h 22m

£362

Flights are sorted by cheapest return flights first.

Deals found on 12/2

Showing 1-10 of 19 results

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.

LHR-STL

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

Prices

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

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 £398). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £619). 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 for a return flight from London Heathrow Airport to St. Louis?

Reviews of airlines servicing St. Louis

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.

Finnair

7.6

Good

1,362 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Finnair

7.6

Good

1,362 reviews

Finnair

7.6

Good

1,362 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

United Airlines

7.4

Good

9,296 reviews

Finnair

7.6

Good

1,362 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Air Canada

7.1

Good

10,718 reviews

Finnair

7.6

Good

1,362 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Lufthansa

6.8

Okay

7,785 reviews

Finnair

7.6

Good

1,362 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

British Airways

6.7

Okay

7,741 reviews

Finnair

7.6

Good

1,362 reviews

Check prices

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

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 17h 43m. 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 £168. Other airlines that can offer you cheap pricing are United Airlines, from £465, and British Airways, from £471. 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 £337. Users have also found prices from £352 and £356 on United Airlines and Finnair, 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 £668, 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 £564 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 £398). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £619). 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

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest£168	Average£754	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
United Airlines	Cheapest£465	Average£724	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£471	Average£754	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Finnair	Cheapest£487	Average£648	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£495	Average£812	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Virgin Atlantic	Cheapest£547	Average£846	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Air Canada	Cheapest£593	Average£730	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Iberia	Cheapest£638	Average£717	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
Lufthansa	Cheapest£649	Average£789	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

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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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Cheap flights from London Heathrow Airport to St. Louis from £353

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 27/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to St. Louis

Cheapest flights from Heathrow to St. LouisExplore 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 14 February 2026.

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 14 February 2026.

Best flights from Heathrow to St. LouisDiscover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 February 2026.

Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 February 2026.

Direct flights from Heathrow to St. LouisExplore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 February 2026.

Explore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 February 2026.

Last-minute flights from Heathrow to St. LouisDiscover last-minute flight deals from Heathrow to St. Louis. Data last updated 14 February 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 14 February 2026 and is based on user searches.

One-way flights from Heathrow to St. LouisSearch for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated 14 February 2026.

Search for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated 14 February 2026.

Find flight deals from Heathrow to St. Louis

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Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.

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.

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?

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

How much does it cost for a return flight from London Heathrow Airport to St. Louis?

What’s the top stopover airport for flights from London Heathrow Airport to St. Louis?

What’s the cheapest stopover airport for flights from London Heathrow Airport to St. Louis?

What’s the fastest stopover option from London Heathrow Airport to St. Louis?

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to St. Louis?

Reviews of airlines servicing St. Louis

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.

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?

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

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

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Heathrow to St. Louis

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Complete your trip

Complete your trip to St. Louis by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to United States

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Search flights from Heathrow to St. Louis by cabin class

Find flights from Heathrow to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Heathrow and St. Louis flights

Browse other Heathrow and St. Louis flight options. Last updated on 14 February 2026.

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Top 9 airlines flying from Heathrow to St. Louis

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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 14 February 2026.

Best flights from Heathrow to St. Louis
Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 February 2026.

Direct flights from Heathrow to St. Louis
Explore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 February 2026.

Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 14 February 2026 and is based on user searches.

One-way flights from Heathrow to St. Louis
Search for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated 14 February 2026.