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Cheap flights from London Heathrow Airport to St. Louis from $453

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 1/19. 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 round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
6:30 am - 1:55 pm
LHR
-
STL
13h 25m1 stop
Lufthansa Logo
11:22 am - 10:25 am
STL
-
LHR
17h 03m1 stop
$573Lufthansa
Fri, Jan 23 - Thu, Feb 5
Multiple Airlines Logo
8:05 pm - 3:29 pm
LHR
-
STL
49h 24m2 stops
Multiple Airlines Logo
12:15 pm - 6:40 am
STL
-
LHR
12h 25m1 stop
$587Multiple Airlines
Tue, Feb 10 - Tue, Feb 17
Multiple Airlines Logo
1:45 pm - 3:29 pm
LHR
-
STL
55h 44m2 stops
Multiple Airlines Logo
6:55 pm - 11:15 am
STL
-
LHR
10h 20m1 stop
$591Multiple Airlines
Mon, Feb 9 - Mon, Feb 16
United Airlines Logo
9:00 am - 7:27 pm
LHR
-
STL
16h 27m2 stops
United Airlines Logo
11:25 am - 6:40 am
STL
-
LHR
13h 15m2 stops
$597United Airlines
Tue, Feb 10 - Tue, Feb 17
United Airlines Logo
6:30 am - 1:55 pm
LHR
-
STL
13h 25m1 stop
United Airlines Logo
3:11 pm - 10:50 am
STL
-
LHR
13h 39m2 stops
$599United Airlines
Fri, Jan 23 - Fri, Jan 30
United Airlines Logo
11:10 am - 10:58 pm
LHR
-
STL
17h 48m2 stops
United Airlines Logo
6:30 am - 5:55 am
STL
-
LHR
17h 25m1 stop
$603United Airlines
Sun, Jan 25 - Sun, Feb 1
United Airlines Logo
8:30 am - 7:27 pm
LHR
-
STL
16h 57m2 stops
United Airlines Logo
10:00 am - 6:20 am
STL
-
LHR
15h 20m2 stops
$604United Airlines
Wed, Jan 14 - Wed, Mar 11
United Airlines Logo
6:50 am - 4:03 pm
LHR
-
STL
15h 13m2 stops
United Airlines Logo
1:15 pm - 7:55 am
STL
-
LHR
12h 40m1 stop
$605United Airlines
Thu, Feb 5 - Mon, Feb 9
United Airlines Logo
6:50 am - 7:27 pm
LHR
-
STL
18h 37m2 stops
United Airlines Logo
1:11 pm - 5:55 am
STL
-
LHR
10h 44m1 stop
$606United Airlines
Sat, Jan 17 - Sat, Feb 14
British Airways Logo
2:10 pm - 8:13 pm
LHR
-
STL
12h 03m1 stop
British Airways Logo
6:58 pm - 12:00 pm
STL
-
LHR
11h 02m1 stop
$611British Airways
Mon, Feb 9 - Mon, Feb 16

Austrian Airlines flights from London Heathrow Airport to St. Louis

Our best Austrian Airlines deals on London Heathrow Airport to St. Louis flight tickets
Austrian Airlines
Feb 9
LHR4:00 pmLondon Heathrow
13h 59m
1 stop
STL11:59 pmLambert-St Louis
Feb 16
STL1:11 pmLambert-St Louis
10h 44m
1 stop
LHR5:55 amLondon Heathrow
$615
Find similar
Austrian Airlines
Feb 13
LHR4:00 pmLondon Heathrow
14h 05m
1 stop
STL12:05 amLambert-St Louis
Feb 19
STL11:39 amLambert-St Louis
14h 46m
1 stop
LHR8:25 amLondon Heathrow
$617
Find similar

Delta flights from London Heathrow Airport to St. Louis

Our best Delta deals on London Heathrow Airport to St. Louis flight tickets
Delta
Jan 7
LHR8:55 amLondon Heathrow
20h 44m
1 stop
STL11:39 pmLambert-St Louis
Jan 14
STL6:00 amLambert-St Louis
19h 50m
1 stop
LHR7:50 amLondon Heathrow
$658
Find similar
Delta
Jan 7
LHR8:55 amLondon Heathrow
17h 48m
2 stops
STL8:43 pmLambert-St Louis
Jan 14
STL6:00 amLambert-St Louis
21h 00m
1 stop
LHR9:00 amLondon Heathrow
$659
Find similar
Delta
Jan 7
LHR8:55 amLondon Heathrow
17h 48m
2 stops
STL8:43 pmLambert-St Louis
Jan 14
STL6:00 amLambert-St Louis
19h 50m
1 stop
LHR7:50 amLondon Heathrow
$688
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated December 28, 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

Fri 1/23

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 2/5

11:22 am-10:25 am

1 stop17h 03m

$573

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/10

8:05 pm-3:29 pm

2 stops49h 24m

Lambert-St Louis

Tue 2/17

12:15 pm-6:40 am

1 stop12h 25m

$587

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/9

1:45 pm-3:29 pm

2 stops55h 44m

Lambert-St Louis

Mon 2/16

6:55 pm-11:15 am

1 stop10h 20m

$591

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/10

9:00 am-7:27 pm

2 stops16h 27m

Lambert-St Louis

Tue 2/17

11:25 am-6:40 am

2 stops13h 15m

$597

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/23

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Fri 1/30

3:11 pm-10:50 am

2 stops13h 39m

$599

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 1/25

11:10 am-10:58 pm

2 stops17h 48m

Lambert-St Louis

Sun 2/1

6:30 am-5:55 am

1 stop17h 25m

$603

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 1/14

8:30 am-7:27 pm

2 stops16h 57m

Lambert-St Louis

Wed 3/11

10:00 am-6:20 am

2 stops15h 20m

$604

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/5

6:50 am-4:03 pm

2 stops15h 13m

Lambert-St Louis

Mon 2/9

1:15 pm-7:55 am

1 stop12h 40m

$605

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 1/17

6:50 am-7:27 pm

2 stops18h 37m

Lambert-St Louis

Sat 2/14

1:11 pm-5:55 am

1 stop10h 44m

$606

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/9

2:10 pm-8:13 pm

1 stop12h 03m

Lambert-St Louis

Mon 2/16

6:58 pm-12:00 pm

1 stop11h 02m

$611

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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?

In general, February is the cheapest month to fly from London Heathrow Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $758. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $857.

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

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $952. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,371. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

Flying to St. Louis from London Heathrow Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,075 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $1,229 per ticket.

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 $980 when searching weeks out. 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 $851 on momondo.

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

There are 2 cabin classes 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?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to St. Louis.

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 round-trip 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

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
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 straight-line distance from London Heathrow to Lambert-St Louis is 4185.8 mi. By plane, this route typically takes 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 necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • 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
British AirwaysPriceFrom $555Free CancellationRating
6.7
7,616 reviews
Search British Airways flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Glencoe
Eureka
Festus
Edwardsville
Litchfield
Shrewsbury

Why use momondo?

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

It is quick and easy to find London to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits 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?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from London.

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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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