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Cheap flights from London Heathrow Airport to St. Louis from $473

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 1/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Aer Lingus Logo
9:50 am - 9:00 pmLHR-STL
17h 10m2 stops
Aer Lingus Logo
6:00 am - 8:05 amSTL-LHR
20h 05m2 stops
$816Aer Lingus
Find Deal
lun., nov. 17 - jue., nov. 20
Aer Lingus Logo
7:50 am - 9:00 pmLHR-STL
19h 10m2 stops
Aer Lingus Logo
6:00 am - 8:05 amSTL-LHR
20h 05m2 stops
$821Aer Lingus
Find Deal
lun., nov. 17 - jue., nov. 20
Aer Lingus Logo
9:50 am - 11:04 pmLHR-STL
19h 14m2 stops
Aer Lingus Logo
6:00 am - 8:05 amSTL-LHR
20h 05m2 stops
$822Aer Lingus
Find Deal
lun., nov. 24 - lun., dic. 1
Multiple Airlines Logo
11:45 am - 7:30 pmLHR-STL
13h 45m1 stop
Multiple Airlines Logo
3:54 pm - 9:15 amSTL-LHR
11h 21m1 stop
$826Multiple Airlines
Find Deal
jue., dic. 25 - dom., ene. 18
Multiple Airlines Logo
6:30 am - 4:07 pmLHR-STL
15h 37m2 stops
Multiple Airlines Logo
5:00 pm - 12:05 pmSTL-LHR
13h 05m2 stops
$829Multiple Airlines
Find Deal
vie., nov. 14 - sáb., nov. 22
Delta Logo
6:30 am - 4:28 pmLHR-STL
15h 58m2 stops
Delta Logo
7:30 am - 7:50 amSTL-LHR
18h 20m1 stop
$831Delta
Find Deal
jue., dic. 25 - dom., ene. 18
Delta Logo
6:30 am - 5:00 pmLHR-STL
16h 30m2 stops
Delta Logo
10:00 am - 8:05 amSTL-LHR
16h 05m2 stops
$832Delta
Find Deal
jue., dic. 25 - dom., ene. 18
Scandinavian Airlines Logo
7:05 am - 9:18 pmLHR-STL
20h 13m3 stops
Scandinavian Airlines Logo
1:57 pm - 9:40 pmSTL-LHR
25h 43m2 stops
$838Scandinavian Airlines
Find Deal
jue., nov. 20 - lun., dic. 8
Scandinavian Airlines Logo
7:05 am - 11:44 pmLHR-STL
22h 39m3 stops
Scandinavian Airlines Logo
11:40 am - 5:40 pmSTL-LHR
24h 00m2 stops
$839Scandinavian Airlines
Find Deal
jue., nov. 20 - lun., dic. 8
British Airways Logo
7:15 pm - 5:54 pmLHR-STL
28h 39m2 stops
British Airways Logo
6:45 pm - 12:30 pmSTL-LHR
35h 45m2 stops
$872British Airways
Find Deal
sáb., nov. 8 - sáb., nov. 22

Scandinavian Airlines flights from London Heathrow Airport to St. Louis

Our best Scandinavian Airlines deals on London Heathrow Airport to St. Louis flight tickets
Scandinavian Airlines
Nov 20
LHR7:05 amLondon Heathrow
20h 13m
3 stops
STL9:18 pmLambert-St Louis
Dec 8
STL1:57 pmLambert-St Louis
25h 43m
2 stops
LHR9:40 pmLondon Heathrow
$838
Find similar
Scandinavian Airlines
Nov 20
LHR7:05 amLondon Heathrow
22h 39m
3 stops
STL11:44 pmLambert-St Louis
Dec 8
STL11:40 amLambert-St Louis
24h 00m
2 stops
LHR5:40 pmLondon Heathrow
$839
Find similar
Scandinavian Airlines
Nov 27
LHR7:05 amLondon Heathrow
20h 53m
3 stops
STL9:58 pmLambert-St Louis
Dec 4
STL11:40 amLambert-St Louis
24h 00m
2 stops
LHR5:40 pmLondon Heathrow
$1,192
Find similar

United Airlines flights from London Heathrow Airport to St. Louis

Our best United Airlines deals on London Heathrow Airport to St. Louis flight tickets
United Airlines
Nov 10
LHR9:00 amLondon Heathrow
18h 40m
2 stops
STL9:40 pmLambert-St Louis
Nov 17
STL6:43 pmLambert-St Louis
10h 32m
1 stop
LHR11:15 amLondon Heathrow
$1,028
Find similar
United Airlines
Nov 10
LHR8:00 amLondon Heathrow
14h 50m
1 stop
STL4:50 pmLambert-St Louis
Nov 17
STL12:31 pmLambert-St Louis
11h 24m
1 stop
LHR5:55 amLondon Heathrow
$1,064
Find similar
United Airlines
Nov 28
LHR6:30 amLondon Heathrow
13h 25m
1 stop
STL1:55 pmLambert-St Louis
Dec 5
STL10:00 amLambert-St Louis
14h 20m
2 stops
LHR6:20 amLondon Heathrow
$1,084
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 octubre 14, 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

lun. 11/17

9:50 am-9:00 pm

2 stops17h 10m

Lambert-St Louis

jue. 11/20

6:00 am-8:05 am

2 stops20h 05m

$816

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

lun. 11/17

7:50 am-9:00 pm

2 stops19h 10m

Lambert-St Louis

jue. 11/20

6:00 am-8:05 am

2 stops20h 05m

$821

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

lun. 11/24

9:50 am-11:04 pm

2 stops19h 14m

Lambert-St Louis

lun. 12/1

6:00 am-8:05 am

2 stops20h 05m

$822

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 12/25

11:45 am-7:30 pm

1 stop13h 45m

Lambert-St Louis

dom. 1/18

3:54 pm-9:15 am

1 stop11h 21m

$826

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

vie. 11/14

6:30 am-4:07 pm

2 stops15h 37m

Lambert-St Louis

sáb. 11/22

5:00 pm-12:05 pm

2 stops13h 05m

$829

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 12/25

6:30 am-4:28 pm

2 stops15h 58m

Lambert-St Louis

dom. 1/18

7:30 am-7:50 am

1 stop18h 20m

$831

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 12/25

6:30 am-5:00 pm

2 stops16h 30m

Lambert-St Louis

dom. 1/18

10:00 am-8:05 am

2 stops16h 05m

$832

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 11/20

7:05 am-9:18 pm

3 stops20h 13m

Lambert-St Louis

lun. 12/8

1:57 pm-9:40 pm

2 stops25h 43m

$838

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 11/20

7:05 am-11:44 pm

3 stops22h 39m

Lambert-St Louis

lun. 12/8

11:40 am-5:40 pm

2 stops24h 00m

$839

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

sáb. 11/8

7:15 pm-5:54 pm

2 stops28h 39m

Lambert-St Louis

sáb. 11/22

6:45 pm-12:30 pm

2 stops35h 45m

$872

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 $811. 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 $977 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 $875 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?

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 October 2025, prices for London Heathrow Airport to St. Louis flights are approximately 22% 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

Direct flights

None
There are no direct flights from London Heathrow Airport to St. Louis. There are no popular flight routes from London Heathrow Airport to St. Louis.
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 13h 10m.

  • 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 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
7,456 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,489 reviews
Search Lufthansa 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
Florissant
Maryland Heights
O'Fallon
Wentzville
Collinsville
Fenton
St. Peters
Alton
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
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

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