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Cheap flights from London Heathrow Airport to St. Louis from £328

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to St. Louis departing on 24/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from London Heathrow Airport to St. Louis

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
13:45 - 15:29
LHR
-
STL
55h 44m2 stops
Multiple Airlines Logo
16:05 - 11:20
STL
-
LHR
13h 15m1 stop
£442Multiple Airlines
ה', 22 ינו' - ב', 26 ינו'
Multiple Airlines Logo
20:05 - 15:29
LHR
-
STL
49h 24m2 stops
Multiple Airlines Logo
12:44 - 06:40
STL
-
LHR
11h 56m1 stop
£443Multiple Airlines
א', 1 פב​​​​​​​' - א', 8 פב​​​​​​​'
Austrian Airlines Logo
16:00 - 23:59
LHR
-
STL
13h 59m1 stop
Austrian Airlines Logo
11:22 - 08:25
STL
-
LHR
15h 03m1 stop
£455Austrian Airlines
ה', 22 ינו' - ב', 26 ינו'
United Airlines Logo
11:10 - 22:58
LHR
-
STL
17h 48m2 stops
United Airlines Logo
09:57 - 06:40
STL
-
LHR
14h 43m2 stops
£464United Airlines
א', 1 פב​​​​​​​' - א', 8 פב​​​​​​​'
United Airlines Logo
08:30 - 19:27
LHR
-
STL
16h 57m2 stops
United Airlines Logo
13:15 - 09:10
STL
-
LHR
13h 55m2 stops
£465United Airlines
ה', 22 ינו' - ב', 26 ינו'
United Airlines Logo
06:50 - 16:03
LHR
-
STL
15h 13m2 stops
United Airlines Logo
13:15 - 07:55
STL
-
LHR
12h 40m1 stop
£466United Airlines
ה', 22 ינו' - ב', 26 ינו'
British Airways Logo
08:20 - 16:14
LHR
-
STL
13h 54m1 stop
British Airways Logo
15:37 - 10:00
STL
-
LHR
12h 23m1 stop
£482British Airways
ג', 13 ינו' - ו', 23 ינו'
British Airways Logo
08:20 - 16:14
LHR
-
STL
13h 54m1 stop
British Airways Logo
15:37 - 10:00
STL
-
LHR
12h 23m1 stop
£483British Airways
ג', 13 ינו' - ו', 23 ינו'
United Airlines Logo
16:00 - 23:59
LHR
-
STL
13h 59m1 stop
United Airlines Logo
16:49 - 11:15
STL
-
LHR
12h 26m1 stop
£488United Airlines
ה', 22 ינו' - ב', 26 ינו'
Finnair Logo
17:00 - 09:03
LHR
-
STL
22h 03m2 stops
Finnair Logo
17:04 - 11:40
STL
-
LHR
12h 36m1 stop
£491Finnair
ג', 13 ינו' - ו', 23 ינו'

British Airways flights from London Heathrow Airport to St. Louis

Our best British Airways deals on London Heathrow Airport to St. Louis flight tickets
British Airways
13 Jan
LHR08:20London Heathrow
13h 54m
1 stop
STL16:14Lambert-St Louis
23 Jan
STL15:37Lambert-St Louis
12h 23m
1 stop
LHR10:00London Heathrow
£482
Find similar
British Airways
13 Jan
LHR08:20London Heathrow
13h 54m
1 stop
STL16:14Lambert-St Louis
23 Jan
STL15:37Lambert-St Louis
12h 23m
1 stop
LHR10:00London Heathrow
£483
Find similar
British Airways
22 Jan
LHR14:10London Heathrow
13h 05m
1 stop
STL21:15Lambert-St Louis
26 Jan
STL14:54Lambert-St Louis
12h 21m
1 stop
LHR09:15London Heathrow
£502
Find similar

Finnair flights from London Heathrow Airport to St. Louis

Our best Finnair deals on London Heathrow Airport to St. Louis flight tickets
Finnair
13 Jan
LHR17:00London Heathrow
22h 03m
2 stops
STL09:03Lambert-St Louis
23 Jan
STL17:04Lambert-St Louis
12h 36m
1 stop
LHR11:40London Heathrow
£490
Find similar
Finnair
13 Jan
LHR15:35London Heathrow
23h 49m
2 stops
STL09:24Lambert-St Louis
23 Jan
STL09:33Lambert-St Louis
16h 17m
1 stop
LHR07:50London Heathrow
£492
Find similar
Finnair
6 Feb
LHR11:45London Heathrow
12h 49m
1 stop
STL18:34Lambert-St Louis
14 Feb
STL12:00Lambert-St Louis
15h 40m
2 stops
LHR09:40London Heathrow
£521
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport 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, momondo users made 279,928 searches. Data last updated 18 דצמבר 2025.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ה' 22/1

13:45-15:29

2 stops55h 44m

Lambert-St Louis

ב' 26/1

16:05-11:20

1 stop13h 15m

£442

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

א' 1/2

20:05-15:29

2 stops49h 24m

Lambert-St Louis

א' 8/2

12:44-06:40

1 stop11h 56m

£443

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ה' 22/1

16:00-23:59

1 stop13h 59m

Lambert-St Louis

ב' 26/1

11:22-08:25

1 stop15h 03m

£455

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

א' 1/2

11:10-22:58

2 stops17h 48m

Lambert-St Louis

א' 8/2

09:57-06:40

2 stops14h 43m

£464

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ה' 22/1

08:30-19:27

2 stops16h 57m

Lambert-St Louis

ב' 26/1

13:15-09:10

2 stops13h 55m

£465

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ה' 22/1

06:50-16:03

2 stops15h 13m

Lambert-St Louis

ב' 26/1

13:15-07:55

1 stop12h 40m

£466

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ג' 13/1

08:20-16:14

1 stop13h 54m

Lambert-St Louis

ו' 23/1

15:37-10:00

1 stop12h 23m

£482

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ג' 13/1

08:20-16:14

1 stop13h 54m

Lambert-St Louis

ו' 23/1

15:37-10:00

1 stop12h 23m

£483

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ה' 22/1

16:00-23:59

1 stop13h 59m

Lambert-St Louis

ב' 26/1

16:49-11:15

1 stop12h 26m

£488

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

ג' 13/1

17:00-09:03

2 stops22h 03m

Lambert-St Louis

ו' 23/1

17:04-11:40

1 stop12h 36m

£490

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from London Heathrow Airport to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to St. Louis?

The month of February is, on average, the cheapest month to fly to St. Louis from London Heathrow Airport, with most prices found around £564. If you’re not able to fly to St. Louis in February, then March is your next best option. Flight prices from London Heathrow Airport to St. Louis during March average around £641.

What is the cheapest day to depart on your flight to St. Louis?

Our data shows that Sunday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £610. Flights from London Heathrow Airport to St. Louis on a Thursday will generally be more expensive and average around £684. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to St. Louis?

Our data shows that the cheapest London Heathrow Airport to St. Louis flights are usually those with departure times in the evening. Our users have found flights to St. Louis in the evening for as low as £562. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £661.

What is the cheapest London Heathrow to Lambert-St Louis flight route?

Fly from London Heathrow to Lambert-St Louis for the best London Heathrow - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around £731 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London Heathrow Airport for as low as £636 on momondo.

What cabin class options are available on London Heathrow to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on London Heathrow to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London Heathrow Airport to St. Louis flights?

You could potentially save up to 21% on your flight if you consider stops on a London Heathrow Airport to St. Louis flight.

How have London Heathrow Airport to St. Louis flight prices changed over time?

As of December 2025, prices for London Heathrow Airport to St. Louis flights are approximately 13% more expensive when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London Heathrow Airport to St. Louis (LHR to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to St. Louis

Best price found

£578

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
The best flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is £578
The fastest flight from London Heathrow Airport to St. Louis takes 9h 05m
Direct flights go from London Heathrow Airport to St. Louis on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights..
There is 1 airport in St. Louis. From London Heathrow Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is London Heathrow to Lambert-St Louis by plane?

    The distance between London Heathrow and Lambert-St Louis is about 4185.8 mi. A reasonable flight in good conditions will take 9h 05m.

  • When did momondo last update prices for flights from London Heathrow Airport to Lambert-St Louis Airport?

    Prices for flights from London Heathrow Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from London Heathrow Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from London Heathrow Airport to Lambert-St Louis Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London Heathrow Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from London Heathrow Airport to St. Louis?

  • What is the most popular airline from London Heathrow Airport to St. Louis?

Best airlines flying from London Heathrow Airport to St. Louis

Compare and see reviews for airlines that fly from London Heathrow Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £171Free CancellationRating
7.2
11,055 reviews
Search American Airlines flights
British AirwaysPriceFrom £483Free CancellationRating
6.7
7,585 reviews
Search British Airways flights
KLMPriceFrom £505Free CancellationRating
7.7
1,428 reviews
Search KLM flights
FinnairPriceFrom £509Free CancellationRating
7.6
1,338 reviews
Search Finnair flights
Virgin AtlanticPriceFrom £562Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
Air CanadaPriceFrom £605Free CancellationRating
7.1
10,534 reviews
Search Air Canada flights
United AirlinesPriceFrom £617Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
IberiaPriceFrom £648Free CancellationRating
7.0
3,053 reviews
Search Iberia flights
LufthansaPriceFrom £676Free CancellationRating
6.8
7,635 reviews
Search Lufthansa flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Collinsville
St. Charles

Why use momondo?

Why should I use momondo to find a flight deal from London to St. Louis?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to St. Louis for you.

Can I find flights from London to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from London which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from London to St. Louis?

momondo provides multiple filters to help you find the best flight to St. Louis from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your St. Louis trip

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