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Cheap flights from London Heathrow Airport to St. Louis from £376

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 24/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
17 Jul — 24 Jul1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or September, booked 26 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 12 July 2025.

Round-trip from

£654

One-way from

£376

Popular in

December

Cheapest in

February

Average price

£773
Scandinavian Airlines
  • Scandinavian Airlines
  • 3/9-22/10
  • 4 total stops
  • 44h 22m total
  • London to St. Louis
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24/10
  • 24/10
  • 3 total stops
  • 35h 32m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£14 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
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Average for round-trip flights in July 2025
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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 12 July 2025.

Wed 3/906:40LHR - STL
2 stops21h 22mScandinavian Airlines
Wed 22/1013:30STL - LHR
2 stops23h 00mScandinavian Airlines
Deal found 11/7£654
Tue 2/916:00LHR - STL
1 stop13h 44mUnited Airlines
Tue 9/907:08STL - LHR
2 stops17h 12mUnited Airlines
Deal found 11/7£679
Sun 31/806:30LHR - STL
1 stop13h 00mLufthansa
Tue 21/1012:25STL - LHR
1 stop17h 20mLufthansa
Deal found 11/7£699
Tue 25/1106:00LHR - STL
2 stops23h 44mAustrian Airlines
Mon 1/1212:31STL - LHR
2 stops40h 19mAustrian Airlines
Deal found 10/7£700
Mon 1/914:25LHR - STL
1 stop11h 53mBritish Airways
Mon 15/915:56STL - LHR
1 stop12h 34mBritish Airways
Deal found 11/7£703
Mon 25/806:50LHR - STL
2 stops19h 10mMultiple Airlines
Tue 9/913:30STL - LHR
1 stop11h 00mMultiple Airlines
Deal found 11/7£717
Mon 25/809:30LHR - STL
1 stop16h 30mAir Canada
Tue 9/913:30STL - LHR
1 stop11h 00mAir Canada
Deal found 11/7£721
Mon 25/806:30LHR - STL
2 stops15h 36mDelta
Tue 9/910:20STL - LHR
2 stops16h 30mDelta
Deal found 11/7£729

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 12 July 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

Wed 3/9

06:40-22:02

2 stops21h 22m

Lambert-St Louis

Wed 22/10

13:30-18:30

2 stops23h 00m

£654

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/9

16:00-23:44

1 stop13h 44m

Lambert-St Louis

Tue 9/9

07:08-06:20

2 stops17h 12m

£679

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 31/8

06:30-13:30

1 stop13h 00m

Lambert-St Louis

Tue 21/10

12:25-11:45

1 stop17h 20m

£699

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 25/11

06:00-23:44

2 stops23h 44m

Lambert-St Louis

Mon 1/12

12:31-10:50

2 stops40h 19m

£700

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 1/9

14:25-20:18

1 stop11h 53m

Lambert-St Louis

Mon 15/9

15:56-10:30

1 stop12h 34m

£703

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 25/8

06:50-20:00

2 stops19h 10m

Lambert-St Louis

Tue 9/9

13:30-06:30

1 stop11h 00m

£717

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 25/8

09:30-20:00

1 stop16h 30m

Lambert-St Louis

Tue 9/9

13:30-06:30

1 stop11h 00m

£721

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 25/8

06:30-16:06

2 stops15h 36m

Lambert-St Louis

Tue 9/9

10:20-08:50

2 stops16h 30m

£729

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 24/10

07:55-13:27

3 stops35h 32m

£376

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 24/10

14:10-23:02

2 stops38h 52m

£569

Flights are sorted by cheapest return flights first.

Deals found on 10/7

Showing 1-10 of 17 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 27 June 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 26 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 12 July 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.

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 12 July 2025.
Get a feel of what it's like to fly with Delta, Austrian Airlines, andUnited Airlines 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
7,951 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

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
7,951 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

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
811 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

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
8,848 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

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.
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

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.
Scandinavian Airlines
7.3
Good
1,421 reviews
Delta
8.0
Very Good
7,951 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Crew

8.5

Overall

8.0

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 £654. Other airlines that can offer you cheap pricing are United Airlines, from £679, and Lufthansa, from £699. Scandinavian Airlines is priced at 7% 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 WestJet. According to our data, you can fly for as low as £569. Users have also found prices from £696 and £711 on Lufthansa 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

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 12 July 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£172Average£760FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Scandinavian AirlinesCheapest£475Average£615FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
FinnairCheapest£506Average£635FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£620Average£847FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£621Average£714FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£623Average£796FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£630Average£845FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£671Average£817FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£711Average£874FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£718Average£843FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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