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Cheap flights from London Heathrow Airport to St. Louis from £622

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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
7 Aug — 14 Aug1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or January, booked 34 days in advance, depart on a Wednesday or Monday and return on a Tuesday

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 2 August 2025.

Round-trip from

£637

One-way from

£622

Popular in

August

Cheapest in

February

Average price

£962
Scandinavian Airlines
  • Scandinavian Airlines
  • 30/8-12/9
  • 4 total stops
  • 55h 36m total
  • London to St. Louis
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Lufthansa
  • Lufthansa
  • 7/1
  • 1 total stop
  • 13h 25m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£57 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Heathrow to St. Louis

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 August 2025.

Sat 30/817:00LHR - STL
2 stops35h 02mScandinavian Airlines
Fri 12/913:26STL - LHR
2 stops20h 34mScandinavian Airlines
Deal found 1/8£637
Wed 3/909:30LHR - STL
2 stops20h 14mUnited Airlines
Wed 24/906:00STL - LHR
1 stop17h 55mUnited Airlines
Deal found 1/8£668
Wed 26/1106:30LHR - STL
1 stop13h 25mLufthansa
Sun 30/1118:43STL - LHR
1 stop10h 32mLufthansa
Deal found 31/7£691
Mon 15/906:50LHR - STL
2 stops14h 28mAir Canada
Mon 22/913:30STL - LHR
1 stop14h 05mAir Canada
Deal found 1/8£695
Wed 3/910:30LHR - STL
2 stops15h 27mMultiple Airlines
Wed 24/913:30STL - LHR
1 stop14h 05mMultiple Airlines
Deal found 1/8£696
Mon 15/912:15LHR - STL
1 stop13h 07mFinnair
Mon 22/916:55STL - LHR
1 stop11h 25mFinnair
Deal found 1/8£702
Wed 17/909:55LHR - STL
2 stops19h 14mVirgin Atlantic
Sat 20/915:55STL - LHR
1 stop33h 20mVirgin Atlantic
Deal found 31/7£729
Mon 15/1208:20LHR - STL
1 stop15h 55mBritish Airways
Thu 15/118:21STL - LHR
1 stop10h 04mBritish Airways
Deal found 1/8£785

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 August 2025.
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

Sat 30/8

17:00-22:02

2 stops35h 02m

Lambert-St Louis

Fri 12/9

13:26-16:00

2 stops20h 34m

£637

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/9

09:30-23:44

2 stops20h 14m

Lambert-St Louis

Wed 24/9

06:00-05:55

1 stop17h 55m

£668

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 26/11

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Sun 30/11

18:43-11:15

1 stop10h 32m

£691

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 15/9

06:50-15:18

2 stops14h 28m

Lambert-St Louis

Mon 22/9

13:30-09:35

1 stop14h 05m

£695

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/9

10:30-19:57

2 stops15h 27m

Lambert-St Louis

Wed 24/9

13:30-09:35

1 stop14h 05m

£696

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 15/9

12:15-19:22

1 stop13h 07m

Lambert-St Louis

Mon 22/9

16:55-10:20

1 stop11h 25m

£702

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 17/9

09:55-23:09

2 stops19h 14m

Lambert-St Louis

Sat 20/9

15:55-07:15

1 stop33h 20m

£729

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 15/12

08:20-18:15

1 stop15h 55m

Lambert-St Louis

Thu 15/1

18:21-10:25

1 stop10h 04m

£785

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 7/1

06:30-13:55

1 stop13h 25m

£622

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 12/11

12:25-09:07

1 stop26h 42m

£633

Flights are sorted by cheapest return flights first.

Deals found on 1/8

Showing 1-10 of 20 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 25 July 2025.

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 34 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 £722). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £1,033). 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 2 August 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from London Heathrow Airport to St. Louis?

Use this chart to determine the cheapest time to fly return from Heathrow to St. Louis. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to St. Louis flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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

Share of one-stop return flights from London Heathrow Airport to St. Louis chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Chicago (ORD) – chosen by Cheapflights users on 63% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.

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

Average return fare for one-stop flights from London Heathrow Airport to St. Louis, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Detroit (DTW) is the most affordable one-stop option, with an average return flight price of £651.

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

Shortest average travel time for one-stop one-way flights from London Heathrow Airport to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Montreal (YUL) have the shortest average one-way travel time for one-stop routes: 11h 50m.

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

Average stopover duration for one-stop one-way flights from London Heathrow Airport to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Frankfurt am Main (FRA) offer the fastest connection on this route, with an average stopover time of 1h 08m.

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 August 2025.
Get a feel of what it's like to fly with Delta, Austrian Airlines, andFinnair 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.
Delta
8.0
Very Good
7,983 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very Good
7,983 reviews
Delta
8.0
Very Good
7,983 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very Good
7,983 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,317 reviews
Delta
8.0
Very Good
7,983 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very Good
7,983 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,904 reviews
Delta
8.0
Very Good
7,983 reviews
Check prices

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

  • 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 £637. Other airlines that can offer you cheap pricing are United Airlines, from £668, and Lufthansa, from £691. Scandinavian Airlines is priced at 13% 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 Lufthansa. According to our data, you can fly for as low as £622. Users have also found prices from £688 and £718 on WestJet and Aer Lingus, respectively.

  • 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 £722). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £1,033). 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 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 2 August 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£176Average£777FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Scandinavian AirlinesCheapest£486Average£629FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
FinnairCheapest£518Average£648FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£632Average£854FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
IberiaCheapest£635Average£730FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£639Average£821FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£644Average£869FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£650Average£842FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£688Average£817FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£728Average£929FlexibilityNo cancel feeOn-time75%
Search KLM 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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