Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from London Heathrow Airport to St. Louis from $471

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 9/24. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from London Heathrow Airport to St. Louis (LHR-STL)

Cheap round-trip flights

Air Canada Logo
9:30 am - 7:57 pmLHR-STL
16h 27m1 stop
Air Canada Logo
4:05 pm - 11:50 amSTL-LHR
13h 45m1 stop
$815Air Canada
Find Deal
Mon, Sep 22 - Mon, Sep 29
Air Canada Logo
2:05 pm - 7:57 pmLHR-STL
11h 52m1 stop
Air Canada Logo
4:05 pm - 10:00 amSTL-LHR
11h 55m1 stop
$816Air Canada
Find Deal
Tue, Sep 23 - Thu, Oct 2
Scandinavian Airlines Logo
6:40 am - 10:00 pmLHR-STL
21h 20m2 stops
Scandinavian Airlines Logo
1:26 pm - 1:35 pmSTL-LHR
18h 09m2 stops
$817Scandinavian Airlines
Find Deal
Wed, Sep 24 - Fri, Oct 3
Scandinavian Airlines Logo
6:40 am - 11:39 pmLHR-STL
22h 59m3 stops
Scandinavian Airlines Logo
1:30 pm - 9:40 pmSTL-LHR
26h 10m2 stops
$834Scandinavian Airlines
Find Deal
Sun, Nov 9 - Thu, Nov 13
Logo
12:15 pm - 11:42 pmLHR-STL
17h 27m2 stops
Logo
7:00 am - 10:50 amSTL-LHR
21h 50m2 stops
$840
Find Deal
Fri, Dec 12 - Mon, Dec 15
Logo
9:35 am - 4:48 pmLHR-STL
13h 13m1 stop
Logo
6:05 am - 10:30 amSTL-LHR
22h 25m2 stops
$880
Find Deal
Fri, Sep 26 - Fri, Oct 3
United Airlines Logo
3:10 pm - 11:42 pmLHR-STL
14h 32m1 stop
United Airlines Logo
7:00 am - 6:40 amSTL-LHR
17h 40m2 stops
$894United Airlines
Find Deal
Fri, Dec 12 - Mon, Dec 15
Lufthansa Logo
9:30 am - 1:55 pmLHR-STL
34h 25m1 stop
Lufthansa Logo
8:25 am - 6:40 amSTL-LHR
16h 15m1 stop
$927Lufthansa
Find Deal
Tue, Jan 13 - Fri, Jan 23
Lufthansa Logo
6:30 am - 2:55 pmLHR-STL
13h 25m1 stop
Lufthansa Logo
6:43 pm - 11:15 amSTL-LHR
10h 32m1 stop
$928Lufthansa
Find Deal
Wed, Oct 29 - Tue, Nov 18
United Airlines Logo
6:30 am - 2:55 pmLHR-STL
13h 25m1 stop
United Airlines Logo
10:00 am - 5:55 amSTL-LHR
13h 55m1 stop
$929United Airlines
Find Deal
Wed, Oct 29 - Sun, Nov 16

Air Canada flights from London Heathrow Airport to St. Louis

Our best Air Canada deals on London Heathrow Airport to St. Louis flight tickets
Air Canada
Sep 22
LHR9:30 amLondon Heathrow
16h 27m
1 stop
STL7:57 pmLambert-St Louis
Sep 29
STL4:05 pmLambert-St Louis
13h 45m
1 stop
LHR11:50 amLondon Heathrow
$815
Find similar
Air Canada
Sep 23
LHR2:05 pmLondon Heathrow
11h 52m
1 stop
STL7:57 pmLambert-St Louis
Oct 2
STL4:05 pmLambert-St Louis
11h 55m
1 stop
LHR10:00 amLondon Heathrow
$816
Find similar
Air Canada
Oct 9
LHR8:30 amLondon Heathrow
12h 48m
1 stop
STL3:18 pmLambert-St Louis
Oct 13
STL4:05 pmLambert-St Louis
10h 30m
1 stop
LHR8:35 amLondon Heathrow
$823
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
Dec 12
LHR3:10 pmLondon Heathrow
14h 32m
1 stop
STL11:42 pmLambert-St Louis
Dec 15
STL7:00 amLambert-St Louis
17h 40m
2 stops
LHR6:40 amLondon Heathrow
$894
Find similar
United Airlines
Oct 29
LHR6:30 amLondon Heathrow
13h 25m
1 stop
STL2:55 pmLambert-St Louis
Nov 16
STL10:00 amLambert-St Louis
13h 55m
1 stop
LHR5:55 amLondon Heathrow
$929
Find similar
United Airlines
Oct 29
LHR6:30 amLondon Heathrow
13h 25m
1 stop
STL2:55 pmLambert-St Louis
Nov 18
STL12:31 pmLambert-St Louis
14h 39m
2 stops
LHR9:10 amLondon Heathrow
$931
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 August 26, 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

Mon 9/22

9:30 am-7:57 pm

1 stop16h 27m

Lambert-St Louis

Mon 9/29

4:05 pm-11:50 am

1 stop13h 45m

$815

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/23

2:05 pm-7:57 pm

1 stop11h 52m

Lambert-St Louis

Thu 10/2

4:05 pm-10:00 am

1 stop11h 55m

$816

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/24

6:40 am-10:00 pm

2 stops21h 20m

Lambert-St Louis

Fri 10/3

1:26 pm-1:35 pm

2 stops18h 09m

$817

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 11/9

6:40 am-11:39 pm

3 stops22h 59m

Lambert-St Louis

Thu 11/13

1:30 pm-9:40 pm

2 stops26h 10m

$834

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 12/12

12:15 pm-11:42 pm

2 stops17h 27m

Lambert-St Louis

Mon 12/15

7:00 am-10:50 am

2 stops21h 50m

$840

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 9/26

9:35 am-4:48 pm

1 stop13h 13m

Lambert-St Louis

Fri 10/3

6:05 am-10:30 am

2 stops22h 25m

$880

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 12/12

3:10 pm-11:42 pm

1 stop14h 32m

Lambert-St Louis

Mon 12/15

7:00 am-6:40 am

2 stops17h 40m

$894

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

9:30 am-1:55 pm

1 stop34h 25m

Lambert-St Louis

Fri 1/23

8:25 am-6:40 am

1 stop16h 15m

$927

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 10/29

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Tue 11/18

6:43 pm-11:15 am

1 stop10h 32m

$928

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 10/29

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Sun 11/16

10:00 am-5:55 am

1 stop13h 55m

$929

Flights are sorted by cheapest round-trip 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?

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 $814. 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.

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 $967 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 $828 on momondo.

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

You could potentially save up to 15% 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 August 2025, prices for London Heathrow Airport to St. Louis flights are approximately 5% 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 11h 52m.

  • 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
7,309 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,359 reviews
Search Lufthansa flights
United AirlinesPriceFrom $952Free CancellationRating
7.4
8,943 reviews
Search United Airlines 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
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
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

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 8/31
Sun 9/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States