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Cheap flights from London Heathrow Airport to St. Louis from £354

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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
21 Jul — 28 Jul1
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 Friday or Tuesday 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 21 June 2026.

Mon 9/1107:05
LHR
-
STL
3 stops22h 34m
Scandinavian Airlines
Fri 13/1116:40
STL
-
LHR
2 stops19h 50m
Scandinavian Airlines
Deal found 17/6£749
Wed 23/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sat 3/1013:25
STL
-
LHR
1 stop12h 25m
British Airways
Deal found 17/6£754
Fri 26/609:15
LHR
-
STL
1 stop14h 04m
Iberia
Sat 27/620:14
STL
-
LHR
1 stop29h 51m
Iberia
Deal found 17/6£755
Fri 26/609:15
LHR
-
STL
2 stops15h 45m
Multiple Airlines
Sat 27/620:14
STL
-
LHR
1 stop29h 51m
Multiple Airlines
Deal found 17/6£756
Wed 7/1019:30
LHR
-
STL
2 stops31h 19m
Scandinavian Airlines
Tue 13/1015:42
STL
-
LHR
2 stops18h 18m
Scandinavian Airlines
Deal found 16/6£757
Fri 3/709:15
LHR
-
STL
1 stop14h 06m
British Airways
Sun 19/721:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 18/6£758
Tue 14/712:15
LHR
-
STL
1 stop18h 01m
Finnair
Tue 21/721:35
STL
-
LHR
Nonstop8h 00m
Finnair
Deal found 16/6£766
Tue 15/916:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Tue 29/921:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 19/6£767
Fri 10/709:15
LHR
-
STL
1 stop14h 06m
American Airlines
Sun 26/721:40
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 20/6£769

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 21 June 2026.

Round-trip from

£749

One-way from

£354

Popular in

July

Cheapest in

February

Average price

£874

Good round-trip deal

£739 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 9/11-13/11
  • 5 total stops
  • 42h 24m total
  • London to St. Louis
Search Deals
16/9
  • 16/9
  • 3 total stops
  • 39h 44m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£118 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£21 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 21 June 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

Mon 9/11

06:40-23:39

3 stops22h 59m

Lambert-St Louis

Fri 13/11

16:40-16:00

2 stops17h 20m

£776

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/8

06:50-15:46

2 stops14h 56m

Lambert-St Louis

Sat 3/10

13:25-09:20

2 stops13h 55m

£785
Fastest return journey

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 16/9

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Wed 23/9

21:35-11:35

Nonstop8h 00m

£830

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 21/8

07:25-17:06

2 stops15h 41m

Lambert-St Louis

Sun 30/8

09:30-07:15

2 stops15h 45m

£837

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/10

07:05-23:36

3 stops22h 31m

Lambert-St Louis

Sun 1/11

13:30-21:40

2 stops26h 10m

£843

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 6/7

15:00-23:57

1 stop14h 57m

Lambert-St Louis

Sun 12/7

21:40-11:40

Nonstop8h 00m

£846

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 27/7

16:25-23:58

1 stop13h 33m

Lambert-St Louis

Wed 5/8

12:45-09:00

1 stop14h 15m

£863

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 28/8

21:05-20:33

3 stops29h 28m

Lambert-St Louis

Mon 7/9

15:39-21:40

2 stops24h 01m

£864

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 9/7

10:05-18:32

1 stop14h 27m

Lambert-St Louis

Sun 12/7

21:40-11:40

Nonstop8h 00m

£866

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 27/7

12:15-19:26

1 stop13h 11m

Lambert-St Louis

Wed 5/8

12:23-08:20

1 stop13h 57m

£874

Flights are sorted by cheapest return flights first.

Deals found on 20/6

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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?

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 71 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 £561). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £1,063). 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 LHR to STL?

Find hourly flight availability from Heathrow to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 June 2026.

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.

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 21 June 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
690 reviews
Check prices

Overall

7.5

Crew

8.1

Entertainment

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
690 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Overall

7.5

Crew

8.1

Entertainment

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,868 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Overall

7.5

Crew

8.1

Entertainment

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Air Canada
7.1
Good
11,231 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Overall

7.5

Crew

8.1

Entertainment

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Lufthansa
6.8
Okay
8,086 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Overall

7.5

Crew

8.1

Entertainment

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,062 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Overall

7.5

Crew

8.1

Entertainment

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

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 2 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 9h 05m. 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 £176. Other airlines that can offer you cheap pricing are Aer Lingus, from £373, and British Airways, from £484. American Airlines is priced at 77% 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 £347. Users have also found prices from £363 and £407 on United Airlines and Lufthansa, respectively.

  • What are the most reliable airlines from London Heathrow Airport to St. Louis?

    The top 3 most reliable airlines when flying from London Heathrow Airport to St. Louis are American Airlines (79%), Aer Lingus (79%) and Finnair (79%).

  • 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 £849, our data shows the cheapest flight currently is £459. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £541 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 £561). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £1,063). 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

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

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 21 June 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£176Average£728FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest£373Average£736FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£484Average£778FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£495Average£757FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£510Average£760FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£562Average£778FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£567Average£716FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£580Average£715FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£649Average£812FlexibilityNo 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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