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Cheap flights from London Heathrow Airport to St. Louis from £270

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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
15 Feb — 22 Feb1
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 Friday or Thursday and return on a Monday

Cheap 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 16 January 2026.

Round-trip from

£360

One-way from

£270

Popular in

August

Cheapest in

February

Average price

£772

Good round-trip deal

£581 or less
United Airlines
  • United Airlines
  • 1/5-5/5
  • 2 total stops
  • 25h 48m total
  • London to St. Louis
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2/2
  • 2/2
  • 3 total stops
  • 56h 43m total
  • London to St. Louis
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Highest demand for flights based on searches. 7% potential increase in price (£46 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
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Average for round-trip flights in January 2026
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Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.
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Find 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 16 January 2026.

Fri 1/508:00
LHR
-
STL
1 stop12h 18m
United Airlines
Tue 5/511:45
STL
-
LHR
1 stop13h 30m
United Airlines
Deal found 15/1£360
Fri 1/516:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 5/521:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 15/1£380
Fri 30/106:30
LHR
-
STL
1 stop13h 25m
Lufthansa
Thu 12/213:11
STL
-
LHR
1 stop12h 44m
Lufthansa
Deal found 14/1£403
Fri 30/113:25
LHR
-
STL
2 stops15h 33m
Air Canada
Thu 12/216:05
STL
-
LHR
1 stop10h 25m
Air Canada
Deal found 14/1£442
Mon 2/209:00
LHR
-
STL
2 stops18h 13m
United Airlines
Thu 12/206:30
STL
-
LHR
1 stop19h 25m
United Airlines
Deal found 15/1£444
Fri 6/209:00
LHR
-
STL
2 stops16h 27m
United Airlines
Sat 14/215:15
STL
-
LHR
1 stop14h 00m
United Airlines
Deal found 14/1£445
Mon 9/211:10
LHR
-
STL
2 stops17h 48m
Lufthansa
Mon 2/313:11
STL
-
LHR
1 stop10h 44m
Lufthansa
Deal found 15/1£448
Mon 2/313:30
LHR
-
STL
2 stops15h 29m
United Airlines
Mon 9/307:40
STL
-
LHR
1 stop22h 35m
United Airlines
Deal found 15/1£449
Wed 11/207:30
LHR
-
STL
2 stops17h 57m
United Airlines
Wed 18/213:11
STL
-
LHR
2 stops15h 14m
United Airlines
Deal found 14/1£450
Thu 5/206:50
LHR
-
STL
2 stops15h 13m
United Airlines
Mon 9/216:49
STL
-
LHR
1 stop12h 26m
United Airlines
Deal found 13/1£450
Fri 17/406:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Sun 19/418:35
STL
-
LHR
1 stop11h 10m
Lufthansa
Deal found 14/1£451
Sun 1/208:30
LHR
-
STL
2 stops20h 28m
Lufthansa
Sat 7/213:15
STL
-
LHR
1 stop10h 40m
Lufthansa
Deal found 15/1£452

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 16 January 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 2/2

09:00-21:13

2 stops18h 13m

Lambert-St Louis

Thu 12/2

06:30-07:55

1 stop19h 25m

£444

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 6/2

09:00-19:27

2 stops16h 27m

Lambert-St Louis

Fri 13/2

09:55-06:40

2 stops14h 45m

£445

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 30/1

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Thu 12/2

11:25-05:55

1 stop12h 30m

£445

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 6/2

09:00-19:27

2 stops16h 27m

Lambert-St Louis

Sat 14/2

15:15-11:15

1 stop14h 00m

£445

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 13/2

08:45-21:40

2 stops18h 55m

Lambert-St Louis

Sun 22/2

18:55-11:15

1 stop10h 20m

£448

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 5/2

06:50-16:03

2 stops15h 13m

Lambert-St Louis

Mon 9/2

08:05-07:55

1 stop17h 50m

£449

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/3

13:30-22:59

2 stops15h 29m

Lambert-St Louis

Mon 9/3

07:40-11:15

1 stop22h 35m

£449

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 11/2

07:30-19:27

2 stops17h 57m

Lambert-St Louis

Wed 18/2

13:11-10:25

2 stops15h 14m

£450

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 7/2

09:55-06:51

3 stops50h 56m

£283

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 9/2

14:50-06:51

2 stops46h 01m

£338

Flights are sorted by cheapest return flights first.

Deals found on 15/1

Showing 1-10 of 18 results
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 9 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 £401). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £607). 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 16 January 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.
Finnair
7.6
Good
1,350 reviews
Check prices

Overall

7.6

Food

6.7

Comfort

7.5

Crew

8.2

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,350 reviews
Finnair
7.6
Good
1,350 reviews
Check prices

Overall

7.6

Food

6.7

Comfort

7.5

Crew

8.2

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
United Airlines
7.4
Good
9,166 reviews
Finnair
7.6
Good
1,350 reviews
Check prices

Overall

7.6

Food

6.7

Comfort

7.5

Crew

8.2

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Air Canada
7.1
Good
10,627 reviews
Finnair
7.6
Good
1,350 reviews
Check prices

Overall

7.6

Food

6.7

Comfort

7.5

Crew

8.2

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Lufthansa
6.8
Okay
7,719 reviews
Finnair
7.6
Good
1,350 reviews
Check prices

Overall

7.6

Food

6.7

Comfort

7.5

Crew

8.2

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,682 reviews
Finnair
7.6
Good
1,350 reviews
Check prices

Overall

7.6

Food

6.7

Comfort

7.5

Crew

8.2

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

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 13m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi.

  • 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 £171. Other airlines that can offer you cheap pricing are British Airways, from £478, and Finnair, from £499. 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 £343. Users have also found prices from £513 and £540 on Virgin Atlantic 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 £597, our data shows the cheapest flight currently is £481. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £403 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 £401). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £607). 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

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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 16 January 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£171Average£766FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£478Average£776FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£499Average£631FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£503Average£842FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£556Average£834FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air CanadaCheapest£603Average£747FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£616Average£751FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£646Average£719FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£660Average£801FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

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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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