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Cheap flights from London Heathrow Airport to St. Louis from £374

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 28/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
26 Feb — 5 Mar1
1 adult

The best prices from London Heathrow to Lambert-St Louis are usually found in March 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 21 February 2025.

Round-trip from

£540

One-way from

£374

Popular in

August

Cheapest in

March

Average price

£642
Finnair
  • Finnair
  • 4/3-11/3
  • 2 total stops
  • 30h 29m total
  • London to St. Louis
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28/2
  • 28/2
  • 3 total stops
  • 35h 02m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£65 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£19 potential savings vs. average return price).
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Average for round-trip flights in February 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 21 February 2025.

Tue 4/311:45LHR - STL
1 stop17h 55mFinnair
Tue 11/316:26STL - LHR
1 stop12h 34mFinnair
Deal found 20/2£540
Tue 13/506:40LHR - STL
2 stops19h 03mMultiple Airlines
Tue 20/507:30STL - LHR
2 stops28h 10mMultiple Airlines
Deal found 20/2£687
Wed 26/306:40LHR - STL
2 stops21h 51mScandinavian Airlines
Mon 31/313:06STL - LHR
2 stops23h 24mScandinavian Airlines
Deal found 19/2£721
Fri 14/308:30LHR - STL
2 stops37h 41mLufthansa
Mon 7/409:39STL - LHR
1 stop14h 41mLufthansa
Deal found 20/2£734
Thu 6/307:40LHR - STL
2 stops15h 31mUnited Airlines
Thu 3/415:40STL - LHR
2 stops13h 45mUnited Airlines
Deal found 19/2£743
Fri 18/412:30LHR - STL
1 stop14h 57mBritish Airways
Fri 25/405:45STL - LHR
1 stop19h 35mBritish Airways
Deal found 19/2£753
Tue 4/306:30LHR - STL
2 stops17h 31mDelta
Tue 11/310:30STL - LHR
2 stops14h 55mDelta
Deal found 20/2£768
Tue 18/310:00LHR - STL
2 stops41h 18mIberia
Sat 22/315:48STL - LHR
1 stop34h 32mIberia
Deal found 19/2£831
Fri 11/411:05LHR - STL
1 stop12h 18mAustrian Airlines
Fri 25/407:25STL - LHR
1 stop22h 00mAustrian Airlines
Deal found 20/2£890
Fri 11/414:05LHR - STL
2 stops30h 44mAir Canada
Fri 25/415:30STL - LHR
2 stops12h 30mAir Canada
Deal found 19/2£894
Wed 20/812:45LHR - STL
2 stops16h 54mVirgin Atlantic
Mon 8/913:30STL - LHR
1 stop11h 45mVirgin Atlantic
Deal found 20/2£938
Tue 18/311:45LHR - STL
2 stops14h 55mKLM
Sat 22/311:34STL - LHR
1 stop14h 31mKLM
Deal found 20/2£957

Find flights from Heathrow to St. Louis within your budget

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 21 February 2025.

Fly from

Heathrow

Fly to

St. Louis

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/3

11:45-23:40

1 stop17h 55m

Lambert-St Louis

Tue 11/3

16:26-10:00

1 stop12h 34m

£540

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 23/4

13:30-20:58

1 stop13h 28m

Lambert-St Louis

Tue 29/4

15:29-07:20

1 stop9h 51m

£670

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/5

06:40-19:43

2 stops19h 03m

Lambert-St Louis

Tue 20/5

07:30-17:40

2 stops28h 10m

£687

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 14/3

08:30-17:11

2 stops37h 41m

Lambert-St Louis

Mon 7/4

09:39-06:20

1 stop14h 41m

£734

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 8/3

07:40-21:49

2 stops20h 09m

Lambert-St Louis

Sat 15/3

16:29-07:30

1 stop34h 01m

£743

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/3

06:30-18:01

2 stops17h 31m

Lambert-St Louis

Tue 11/3

10:30-06:25

2 stops14h 55m

£768

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 17/4

12:05-14:49

1 stop32h 44m

Lambert-St Louis

Sun 27/4

15:30-10:00

2 stops36h 30m

£836

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 11/4

11:05-17:23

1 stop12h 18m

Lambert-St Louis

Fri 25/4

07:25-11:25

1 stop22h 00m

£890

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 20/8

12:45-23:39

2 stops16h 54m

Lambert-St Louis

Mon 8/9

13:30-07:15

1 stop11h 45m

£938

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 18/3

11:45-21:40

2 stops14h 55m

Lambert-St Louis

Sat 22/3

11:34-07:05

1 stop14h 31m

£957

Flights are sorted by cheapest return flights first.

Deals found on 20/2

Showing 1-10 of 21 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.

Travel insights for flights from Heathrow to St. Louis

Get recent, data-driven insights about flights from Heathrow to St. Louis including ideal travel times, pricing trends, and more.

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 February 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 21 February 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 21 February 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.
Delta
8.0
Very Good
8,217 reviews
Check prices

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

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

Delta
8.0
Very Good
8,217 reviews
Delta
8.0
Very Good
8,217 reviews
Check prices

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

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

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very Good
8,217 reviews
Check prices

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

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

Finnair
7.6
Good
1,273 reviews
Delta
8.0
Very Good
8,217 reviews
Check prices

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

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

Austrian Airlines
7.5
Good
771 reviews
Delta
8.0
Very Good
8,217 reviews
Check prices

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

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

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very Good
8,217 reviews
Check prices

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

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 £540. Other airlines that can offer you cheap pricing are Scandinavian Airlines, from £721, and Lufthansa, from £734. Finnair is priced at 24% 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 £451. Users have also found prices from £627 and £630 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 21 February 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£525Average£671FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£627Average£753FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£660Average£860FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£675Average£878FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£678Average£932FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£719Average£866FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air CanadaCheapest£770Average£869FlexibilityNo 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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