Cheap flights from London Heathrow Airport to St. Louis from £282

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 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
2 Jan — 9 Jan1
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 Saturday 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 3 December 2025.

Wed 10/1214:10LHR - STL
1 stop12h 14mBritish Airways
Thu 8/112:11STL - LHR
1 stop12h 19mBritish Airways
Deal found 1/12£566
Thu 25/1209:55LHR - STL
1 stop15h 35mBritish Airways
Sun 18/118:44STL - LHR
1 stop10h 51mBritish Airways
Deal found 1/12£627
Wed 10/1212:35LHR - STL
1 stop13h 49mBritish Airways
Tue 6/114:54STL - LHR
1 stop22h 06mBritish Airways
Deal found 1/12£634
Tue 30/1211:05LHR - STL
1 stop17h 11mVirgin Atlantic
Tue 6/111:23STL - LHR
1 stop13h 42mVirgin Atlantic
Deal found 2/12£641
Thu 4/1207:50LHR - STL
2 stops17h 15mAer Lingus
Mon 8/1215:22STL - LHR
2 stops14h 03mAer Lingus
Deal found 1/12£657
Wed 17/1213:30LHR - STL
1 stop26h 01mFinnair
Wed 7/117:59STL - LHR
2 stops22h 11mFinnair
Deal found 1/12£673
Fri 5/1219:45LHR - STL
2 stops30h 53mAer Lingus
Mon 8/1213:59STL - LHR
2 stops15h 26mAer Lingus
Deal found 1/12£684
Thu 25/1208:40LHR - STL
2 stops18h 01mDelta
Sun 18/112:00STL - LHR
1 stop17h 40mDelta
Deal found 2/12£710

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 3 December 2025.

Round-trip from

£494

One-way from

£282

Popular in

August

Cheapest in

February

Average price

£855

Good round-trip deal

£659 or less
British Airways
  • British Airways
  • 10/2-16/2
  • 3 total stops
  • 31h 36m total
  • London to St. Louis
16/1
  • 16/1
  • 3 total stops
  • 42h 39m total
  • London to St. Louis
Highest demand for flights based on searches. 6% potential increase in price (£37 potential increase over avg. return price).
Cheapest flight prices on average. 1% potential price decrease (£10 potential savings vs. average return price).
Average for round-trip flights in December 2025
Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.

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 3 December 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

Mon 9/2

18:45-16:14

2 stops27h 29m

Lambert-St Louis

Sun 15/2

11:34-19:00

1 stop25h 26m

£496

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/2

11:00-18:14

1 stop13h 14m

Lambert-St Louis

Wed 11/2

15:20-08:15

1 stop10h 55m

£514

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/2

11:45-18:34

1 stop12h 49m

Lambert-St Louis

Sun 15/2

18:33-06:55

1 stop30h 22m

£514

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 10/5

16:20-21:48

2 stops35h 28m

Lambert-St Louis

Mon 18/5

06:05-06:50

1 stop18h 45m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 10/5

16:20-21:48

2 stops35h 28m

Lambert-St Louis

Tue 19/5

11:14-09:05

1 stop15h 51m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 10/5

18:45-21:48

2 stops33h 03m

Lambert-St Louis

Wed 20/5

09:15-07:50

1 stop16h 35m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 12/1

11:45-18:34

1 stop12h 49m

Lambert-St Louis

Mon 26/1

11:55-10:00

1 stop16h 05m

£516

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 5/5

18:05-13:49

2 stops25h 44m

Lambert-St Louis

Tue 19/5

10:00-09:25

1 stop17h 25m

£516

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/5

06:10-21:48

2 stops21h 38m

Lambert-St Louis

Tue 19/5

06:05-16:20

2 stops28h 15m

£517

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

06:05-18:34

2 stops18h 29m

Lambert-St Louis

Fri 23/1

11:05-10:25

1 stop17h 20m

£525

Flights are sorted by cheapest return flights first.

Deals found on 1/12

Showing 1-10 of 23 results
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?

Use this chart to determine the optimal time to book a return flight from Heathrow to St. Louis. Price data was last updated on 28 November 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 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 £410). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £626). 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 3 December 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 afternoon.

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. Saturday 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 3 December 2025.
Get a feel of what it's like to fly with Finnair, United Airlines, andIberia 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.

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

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.

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

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.

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

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.

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

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.

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

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.

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

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 27h 29m. 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 £174. Other airlines that can offer you cheap pricing are KLM, from £511, and Finnair, from £517. 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 Finnair. According to our data, you can fly for as low as £548. Users have also found prices from £564 and £584 on Lufthansa and Virgin Atlantic, 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 £675, our data shows the cheapest flight currently is £634. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £502 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 £410). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £626). 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 3 December 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£174Average£778FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
KLMCheapest£511Average£855FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£517Average£659FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£524Average£810FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£608Average£856FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air CanadaCheapest£612Average£764FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£625Average£767FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£648Average£733FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£684Average£818FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.