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Cheap flights from London Heathrow Airport to St. Louis from £355

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
20 Jul — 27 Jul1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or March, 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 15 July 2025.

Round-trip from

£619

One-way from

£355

Popular in

August

Cheapest in

February

Average price

£807
28/8-4/9
  • 28/8-4/9
  • 6 total stops
  • 54h 25m total
  • London to St. Louis
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28/10
  • 28/10
  • 3 total stops
  • 47h 12m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£59 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£17 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 15 July 2025.

Thu 28/813:05LHR - STL
3 stops29h 05mMultiple Airlines
Thu 4/913:00STL - LHR
3 stops25h 20mMultiple Airlines
Deal found 14/7£619
Thu 16/1006:40LHR - STL
2 stops22h 59mScandinavian Airlines
Tue 21/1013:30STL - LHR
2 stops22h 10mScandinavian Airlines
Deal found 13/7£646
Sun 24/808:00LHR - STL
1 stop21h 44mUnited Airlines
Sun 7/906:00STL - LHR
1 stop19h 15mUnited Airlines
Deal found 13/7£660
Sat 20/909:30LHR - STL
1 stop16h 27mAir Canada
Sat 4/1013:30STL - LHR
1 stop14h 05mAir Canada
Deal found 14/7£700
Tue 25/1114:10LHR - STL
1 stop13h 31mBritish Airways
Mon 1/1217:57STL - LHR
1 stop11h 43mBritish Airways
Deal found 14/7£712
Mon 25/808:40LHR - STL
2 stops15h 43mDelta
Tue 9/915:36STL - LHR
2 stops13h 49mDelta
Deal found 14/7£727
Wed 27/806:30LHR - STL
2 stops18h 31mVirgin Atlantic
Wed 3/913:26STL - LHR
1 stop18h 04mVirgin Atlantic
Deal found 13/7£772

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 15 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

Thu 28/8

13:05-12:10

3 stops29h 05m

Lambert-St Louis

Thu 4/9

13:00-20:20

3 stops25h 20m

£619

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 16/10

06:40-23:39

2 stops22h 59m

Lambert-St Louis

Tue 21/10

13:30-17:40

2 stops22h 10m

£646

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 24/8

08:00-23:44

1 stop21h 44m

Lambert-St Louis

Sun 7/9

06:00-07:15

1 stop19h 15m

£660

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 20/9

09:30-19:57

1 stop16h 27m

Lambert-St Louis

Sat 4/10

13:30-09:35

1 stop14h 05m

£700

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 25/11

14:10-21:41

1 stop13h 31m

Lambert-St Louis

Mon 1/12

17:57-11:40

1 stop11h 43m

£712

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 25/8

08:40-18:23

2 stops15h 43m

Lambert-St Louis

Tue 9/9

15:36-11:25

2 stops13h 49m

£727

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 27/8

06:30-19:01

2 stops18h 31m

Lambert-St Louis

Wed 3/9

13:26-13:30

1 stop18h 04m

£772

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 28/10

19:15-13:27

3 stops47h 12m

£355

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 2/11

14:50-18:02

2 stops33h 12m

£518

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 27/8

07:40-18:23

2 stops16h 43m

£618

Flights are sorted by cheapest return flights first.

Deals found on 14/7

Showing 1-10 of 12 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 11 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 15 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 15 July 2025.
Get a feel of what it's like to fly with Delta, United Airlines, andVirgin Atlantic 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
7,956 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

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
7,956 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

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
8,861 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

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
655 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

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
1,423 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

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.
WestJet
7.2
Good
2,939 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

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 £646. Other airlines that can offer you cheap pricing are United Airlines, from £660, and Air Canada, from £700. Scandinavian Airlines is priced at 10% 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 £518. Users have also found prices from £618 and £639 on Aer Lingus and Lufthansa, 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 15 July 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£173Average£763FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Scandinavian AirlinesCheapest£478Average£618FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
FinnairCheapest£508Average£638FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£623Average£843FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£623Average£807FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£624Average£718FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Virgin AtlanticCheapest£633Average£851FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£675Average£804FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£715Average£878FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£726Average£849FlexibilityNo 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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