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Cheap flights from London Heathrow Airport to St. Louis from £319

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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
25 Mar — 1 Apr1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in September or February, 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 20 March 2025.

Round-trip from

£570

One-way from

£319

Popular in

August

Cheapest in

September

Average price

£629
Finnair
  • Finnair
  • 3/9-24/9
  • 2 total stops
  • 28h 32m total
  • London to St. Louis
3/5
  • 3/5
  • 3 total stops
  • 32h 56m total
  • London to St. Louis
Highest demand for flights based on searches. 9% potential increase in price (£59 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
Average for round-trip flights in March 2025

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 20 March 2025.

Wed 3/912:15LHR - STL
1 stop16h 46mFinnair
Wed 24/918:59STL - LHR
1 stop11h 46mFinnair
Deal found 19/3£570
Tue 6/508:00LHR - STL
2 stops20h 03mUnited Airlines
Thu 15/506:15STL - LHR
1 stop23h 20mUnited Airlines
Deal found 20/3£607
Thu 17/413:05LHR - STL
3 stops28h 40mMultiple Airlines
Thu 24/413:00STL - LHR
3 stops25h 20mMultiple Airlines
Deal found 20/3£652
Wed 2/412:30LHR - STL
1 stop14h 11mIberia
Wed 9/410:17STL - LHR
1 stop18h 13mIberia
Deal found 20/3£680
Tue 22/408:30LHR - STL
1 stop12h 19mAir Canada
Tue 6/513:30STL - LHR
1 stop11h 00mAir Canada
Deal found 20/3£685
Wed 23/412:30LHR - STL
1 stop14h 28mBritish Airways
Wed 30/418:00STL - LHR
1 stop12h 15mBritish Airways
Deal found 19/3£709
Wed 3/906:30LHR - STL
1 stop13h 00mLufthansa
Wed 24/909:17STL - LHR
2 stops15h 38mLufthansa
Deal found 19/3£715
Fri 25/407:05LHR - STL
3 stops19h 34mScandinavian Airlines
Mon 28/416:05STL - LHR
2 stops19h 35mScandinavian Airlines
Deal found 19/3£780
Tue 29/406:15LHR - STL
2 stops21h 21mVirgin Atlantic
Thu 11/915:30STL - LHR
1 stop16h 00mVirgin Atlantic
Deal found 19/3£796
Tue 1/408:40LHR - STL
2 stops19h 00mDelta
Tue 8/413:05STL - LHR
2 stops13h 50mDelta
Deal found 20/3£830
Sun 27/408:50LHR - STL
2 stops19h 22mAer Lingus
Mon 28/406:15STL - LHR
2 stops22h 55mAer Lingus
Deal found 19/3£854
Mon 21/409:00LHR - STL
2 stops17h 39mAir France
Fri 25/417:32STL - LHR
1 stop11h 38mAir France
Deal found 20/3£1,006

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 20 March 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

12:15-23:01

1 stop16h 46m

Lambert-St Louis

Wed 24/9

18:59-12:45

1 stop11h 46m

£570

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 6/5

08:00-22:03

2 stops20h 03m

Lambert-St Louis

Thu 15/5

06:15-11:35

1 stop23h 20m

£607

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 17/4

13:05-11:45

3 stops28h 40m

Lambert-St Louis

Thu 24/4

13:00-20:20

3 stops25h 20m

£652

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 2/4

12:30-20:41

1 stop14h 11m

Lambert-St Louis

Wed 9/4

10:17-10:30

1 stop18h 13m

£680

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 22/4

08:30-14:49

1 stop12h 19m

Lambert-St Louis

Tue 6/5

13:30-06:30

1 stop11h 00m

£685

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 23/4

12:30-20:58

1 stop14h 28m

Lambert-St Louis

Wed 30/4

18:00-12:15

1 stop12h 15m

£709

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/9

06:30-13:30

1 stop13h 00m

Lambert-St Louis

Wed 24/9

09:17-06:55

2 stops15h 38m

£715

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 25/4

07:05-20:39

3 stops19h 34m

Lambert-St Louis

Mon 28/4

16:05-17:40

2 stops19h 35m

£780

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 29/4

06:15-21:36

2 stops21h 21m

Lambert-St Louis

Thu 11/9

15:30-13:30

1 stop16h 00m

£796

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/4

08:40-21:40

2 stops19h 00m

Lambert-St Louis

Tue 8/4

13:05-08:55

2 stops13h 50m

£830

Flights are sorted by cheapest return flights first.

Deals found on 19/3

Showing 1-10 of 28 results
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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 14 March 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 20 March 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.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 inches per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

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 20 March 2025.
To help decide which airline to fly from London to St. Louis, see what other customers have to say about Delta, KLM and Finnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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. 7 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 £570. Other airlines that can offer you cheap pricing are United Airlines, from £607, and Iberia, from £680. Finnair is priced at 19% 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 £454. Users have also found prices from £561 and £633 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 7 airlines flying from Heathrow to St. Louis

Discover the top 7 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 20 March 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£513Average£660FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£619Average£738FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£642Average£836FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£656Average£848FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£659Average£906FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£699Average£906FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air CanadaCheapest£725Average£845FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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