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Cheap flights from London Heathrow Airport to St. Louis from $419

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 6/11. 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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0 bags

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

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from London Heathrow Airport to St. Louis.
Iberia Logo
12:30 pm - 8:21 pmLHR-STL
13h 51m1 stop
Iberia Logo
8:01 pm - 12:15 pmSTL-LHR
10h 14m1 stop
$932Iberia
Find Deal
Mon, Sep 29 - Mon, Oct 6
Iberia Logo
12:30 pm - 8:21 pmLHR-STL
13h 51m1 stop
Iberia Logo
8:01 pm - 7:10 pmSTL-LHR
17h 09m2 stops
$958Iberia
Find Deal
Mon, Sep 29 - Mon, Oct 6
Lufthansa Logo
2:05 pm - 7:58 pmLHR-STL
11h 53m1 stop
Lufthansa Logo
3:43 pm - 10:40 amSTL-LHR
12h 57m2 stops
$963Lufthansa
Find Deal
Sat, May 3 - Sat, May 10
 Logo
10:30 am - 7:58 pmLHR-STL
15h 28m2 stops
 Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
Sat, May 3 - Sun, May 18
 Logo
10:30 am - 7:58 pmLHR-STL
15h 28m2 stops
 Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
Sat, May 3 - Sun, May 18
United Airlines Logo
2:05 pm - 7:58 pmLHR-STL
11h 53m1 stop
United Airlines Logo
1:30 pm - 10:00 amSTL-LHR
14h 30m1 stop
$1,001United Airlines
Find Deal
Sat, May 3 - Sun, May 18
United Airlines Logo
2:05 pm - 7:58 pmLHR-STL
11h 53m1 stop
United Airlines Logo
1:30 pm - 10:00 amSTL-LHR
14h 30m1 stop
$1,007United Airlines
Find Deal
Sat, May 3 - Sun, May 18
Lufthansa Logo
8:30 am - 12:25 pmLHR-STL
33h 55m2 stops
Lufthansa Logo
3:30 pm - 8:20 amSTL-LHR
10h 50m1 stop
$1,029Lufthansa
Find Deal
Sat, Oct 4 - Wed, Oct 22
British Airways Logo
1:30 pm - 8:21 pmLHR-STL
12h 51m1 stop
British Airways Logo
8:01 pm - 12:15 pmSTL-LHR
10h 14m1 stop
$1,058British Airways
Find Deal
Sat, Oct 4 - Wed, Oct 22
British Airways Logo
9:15 am - 3:21 pmLHR-STL
12h 06m1 stop
British Airways Logo
7:30 pm - 12:15 pmSTL-LHR
10h 45m1 stop
$1,085British Airways
Find Deal
Mon, May 12 - Mon, May 26

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
May 1
LHR5:40 pmLondon Heathrow
24h 56m
1 stop
STL12:36 pmLambert-St Louis
May 14
STL1:30 pmLambert-St Louis
14h 30m
1 stop
LHR10:00 amLondon Heathrow
Air Canada
May 16
LHR5:40 pmLondon Heathrow
24h 56m
1 stop
STL12:36 pmLambert-St Louis
May 21
STL7:30 amLambert-St Louis
17h 05m
1 stop
LHR6:35 amLondon Heathrow
Air Canada
May 1
LHR5:40 pmLondon Heathrow
32h 18m
2 stops
STL7:58 pmLambert-St Louis
May 14
STL2:30 pmLambert-St Louis
13h 30m
2 stops
LHR10:00 amLondon Heathrow

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
Oct 4
LHR1:30 pmLondon Heathrow
12h 51m
1 stop
STL8:21 pmLambert-St Louis
Oct 22
STL8:01 pmLambert-St Louis
10h 14m
1 stop
LHR12:15 pmLondon Heathrow
British Airways
May 12
LHR9:15 amLondon Heathrow
12h 06m
1 stop
STL3:21 pmLambert-St Louis
May 26
STL7:30 pmLambert-St Louis
10h 45m
1 stop
LHR12:15 pmLondon Heathrow
British Airways
Apr 26
LHR3:30 pmLondon Heathrow
12h 42m
1 stop
STL10:12 pmLambert-St Louis
May 29
STL1:45 pmLambert-St Louis
10h 55m
1 stop
LHR6:40 amLondon Heathrow

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 typical price of a round-trip flight between London Heathrow Airport and St. Louis?

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 September is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $819.

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 4 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $930 when searching 4 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 $826 on momondo.

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

As of April 2025, prices for London Heathrow Airport to St. Louis flights are approximately 1% 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

Best Price Found

$419

Fastest flight time

11h 38m

Direct flights

None

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from London Heathrow Airport in the past 72 hours is $419. The best round-trip flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is $932.
The fastest flight from London Heathrow Airport to St. Louis takes 11h 38m
There are no direct flights from London Heathrow Airport to St. Louis. Popular non-direct route for this connection is London Heathrow Airport - Lambert-St Louis Airport.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • 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 48m.

  • 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
American AirlinesPriceFrom $278Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $867Free CancellationRating
7.4
8,685 reviews
Search United Airlines flights
LufthansaPriceFrom $925Free CancellationRating
6.7
7,027 reviews
Search Lufthansa flights
British AirwaysPriceFrom $961Free CancellationRating
6.6
6,799 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
Florissant
Maryland Heights
Hermann
Fairview Heights
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Wentzville
Alton
Glencoe
Eureka
Edwardsville
Festus
Clayton
Grafton
Litchfield

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.


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