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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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
18 May — 25 May1
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 72 days in advance, depart on a Thursday or Monday and return on a Wednesday

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 18 April 2026.

Tue 5/510:45
LHR
-
STL
1 stop11h 57m
Delta
Sat 23/516:00
STL
-
LHR
1 stop15h 05m
Delta
Deal found 15/4£610
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Wed 23/915:33
STL
-
LHR
1 stop15h 17m
Multiple Airlines
Deal found 13/4£611
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/916:47
STL
-
LHR
1 stop10h 38m
British Airways
Deal found 16/4£613
Mon 11/513:25
LHR
-
STL
1 stop16h 34m
Delta
Sun 17/517:34
STL
-
LHR
1 stop13h 31m
Delta
Deal found 15/4£616
Tue 8/910:05
LHR
-
STL
1 stop16h 21m
Multiple Airlines
Tue 22/920:07
STL
-
LHR
1 stop10h 08m
Multiple Airlines
Deal found 14/4£618
Wed 2/907:30
LHR
-
STL
2 stops22h 21m
Finnair
Wed 23/912:43
STL
-
LHR
1 stop14h 22m
Finnair
Deal found 14/4£624
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Mon 21/905:40
STL
-
LHR
1 stop18h 40m
American Airlines
Deal found 14/4£628

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 18 April 2026.

Round-trip from

£610

One-way from

£353

Popular in

July

Cheapest in

February

Average price

£723

Good round-trip deal

£622 or less
Delta
  • Delta
  • 5/5-23/5
  • 2 total stops
  • 27h 02m total
  • London to St. Louis
Search Deals
4/5
  • 4/5
  • 3 total stops
  • 53h 00m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£60 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.
Search Deals

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 18 April 2026.
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

Cheapest return flight

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 30/9

06:45-21:23

2 stops20h 38m

Lambert-St Louis

Sun 4/10

20:07-11:15

1 stop33h 08m

£637

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

15:00-22:40

1 stop13h 40m

Lambert-St Louis

Tue 22/9

16:47-12:10

1 stop13h 23m

£650

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

09:55-20:50

2 stops16h 55m

Lambert-St Louis

Tue 22/9

16:13-10:20

1 stop12h 07m

£653

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 24/9

06:40-23:37

2 stops22h 57m

Lambert-St Louis

Mon 28/9

15:42-16:00

2 stops18h 18m

£726

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 20/5

06:30-14:31

2 stops14h 01m

Lambert-St Louis

Sun 24/5

16:25-14:35

1 stop16h 10m

£768

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 19/5

06:30-16:46

2 stops16h 16m

Lambert-St Louis

Thu 28/5

16:25-12:10

1 stop13h 45m

£772

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 3/7

06:15-20:29

2 stops20h 14m

Lambert-St Louis

Wed 22/7

17:18-12:10

1 stop12h 52m

£781

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/5

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Fri 15/5

11:25-07:20

1 stop13h 55m

£787
Fastest return journey

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 19/5

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Thu 28/5

19:50-12:15

1 stop10h 25m

£787

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 30/8

19:35-23:23

2 stops33h 48m

Lambert-St Louis

Thu 3/9

06:06-06:50

1 stop18h 44m

£795

Flights are sorted by cheapest return flights first.

Deals found on 18/4

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 10 April 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 72 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £550). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £862). 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 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 18 April 2026.
Get a feel of what it's like to fly with Virgin Atlantic,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.
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
687 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
United Airlines
7.4
Good
9,604 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Air Canada
7.1
Good
10,938 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Lufthansa
6.8
Okay
7,930 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,891 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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. 10 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 16h 55m. 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 £198. Other airlines that can offer you cheap pricing are United Airlines, from £468, and British Airways, from £474. American Airlines is priced at 73% 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 £340. Users have also found prices from £355 and £358 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 £663, our data shows the cheapest flight currently is £576. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £613 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £550). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £862). 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 10 airlines flying from Heathrow to St. Louis

Discover the top 10 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 18 April 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£198Average£727FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest£468Average£732FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£474Average£729FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£515Average£744FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£550Average£761FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£581Average£663FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Scandinavian AirlinesCheapest£590Average£697FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air CanadaCheapest£597Average£712FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£646Average£794FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IberiaCheapest£651Average£743FlexibilityNo cancel feeOn-time77%
Search Iberia 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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