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Cheap flights from London Heathrow Airport to St. Louis from $597

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 5/22. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from London Heathrow Airport to St. Louis.
 Logo
1:05 pm - 11:45 amLHR-STL
28h 40m3 stops
 Logo
12:15 pm - 8:20 pmSTL-LHR
26h 05m3 stops
Thu, May 1 - Mon, May 5
United Airlines Logo
8:00 am - 10:03 pmLHR-STL
20h 03m2 stops
United Airlines Logo
3:43 pm - 8:20 amSTL-LHR
10h 37m1 stop
$785United Airlines
Find Deal
Thu, May 8 - Thu, May 15
Iberia Logo
12:30 pm - 8:21 pmLHR-STL
13h 51m1 stop
Iberia Logo
4:52 pm - 10:30 amSTL-LHR
11h 38m1 stop
$897Iberia
Find Deal
Tue, Sep 23 - Wed, Oct 1
Iberia Logo
1:30 pm - 8:58 pmLHR-STL
13h 28m1 stop
Iberia Logo
7:30 pm - 12:15 pmSTL-LHR
10h 45m1 stop
$901Iberia
Find Deal
Thu, May 1 - Mon, May 5
Lufthansa Logo
6:30 am - 3:47 pmLHR-STL
15h 17m2 stops
Lufthansa Logo
5:29 pm - 11:45 amSTL-LHR
12h 16m1 stop
$933Lufthansa
Find Deal
Thu, May 1 - Mon, May 5
Lufthansa Logo
6:30 am - 3:47 pmLHR-STL
15h 17m2 stops
Lufthansa Logo
5:29 pm - 3:40 pmSTL-LHR
16h 11m2 stops
$958Lufthansa
Find Deal
Thu, May 1 - Mon, May 5
British Airways Logo
10:30 am - 6:21 pmLHR-STL
13h 51m1 stop
British Airways Logo
7:30 pm - 12:15 pmSTL-LHR
10h 45m1 stop
$972British Airways
Find Deal
Mon, May 5 - Mon, May 12
Finnair Logo
12:15 pm - 10:12 pmLHR-STL
15h 57m1 stop
Finnair Logo
4:15 pm - 12:15 pmSTL-LHR
14h 00m1 stop
$981Finnair
Find Deal
Mon, Apr 28 - Mon, May 12
British Airways Logo
10:30 am - 7:29 pmLHR-STL
14h 59m1 stop
British Airways Logo
2:03 pm - 8:05 amSTL-LHR
12h 02m1 stop
$1,096British Airways
Find Deal
Mon, Apr 14 - Fri, Apr 18
Finnair Logo
1:35 pm - 11:49 pmLHR-STL
40h 14m2 stops
Finnair Logo
2:02 pm - 9:00 amSTL-LHR
12h 58m1 stop
$1,562Finnair
Find Deal
Sun, Aug 17 - Sun, Aug 31

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
Jun 10
LHR6:40 pmLondon Heathrow
35h 02m
2 stops
STL11:42 pmLambert-St Louis
Jun 15
STL1:32 pmLambert-St Louis
20h 28m
2 stops
LHR4:00 pmLondon Heathrow
Scandinavian Airlines
Apr 5
LHR6:40 amLondon Heathrow
22h 49m
2 stops
STL11:29 pmLambert-St Louis
Apr 7
STL1:05 pmLambert-St Louis
20h 55m
2 stops
LHR4:00 pmLondon Heathrow
Scandinavian Airlines
Apr 28
LHR7:05 amLondon Heathrow
22h 31m
3 stops
STL11:36 pmLambert-St Louis
May 12
STL3:40 pmLambert-St Louis
18h 20m
2 stops
LHR4:00 pmLondon Heathrow

WestJet flights from London Heathrow Airport to St. Louis

Our best WestJet deals on London Heathrow Airport to St. Louis flight tickets
WestJet
Apr 14
LHR1:55 pmLondon Heathrow
25h 41m
2 stops
STL9:36 amLambert-St Louis
Apr 18
STL9:06 amLambert-St Louis
44h 59m
2 stops
LHR12:05 pmLondon Heathrow
WestJet
Apr 14
LHR1:55 pmLondon Heathrow
25h 41m
2 stops
STL9:36 amLambert-St Louis
Apr 17
STL3:30 pmLambert-St Louis
62h 35m
2 stops
LHR12:05 pmLondon 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 $811.

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 $921 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 $809 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 3% 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

$597

Fastest flight time

11h 52m

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 $597. The best round-trip flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is $719.
The fastest flight from London Heathrow Airport to St. Louis takes 11h 52m
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 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
American AirlinesPriceFrom $278Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $867Free CancellationRating
7.4
8,616 reviews
Search United Airlines flights
LufthansaPriceFrom $925Free CancellationRating
6.7
6,963 reviews
Search Lufthansa flights
British AirwaysPriceFrom $997Free CancellationRating
6.6
6,717 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
Fairview Heights
Maryland Heights
Hermann
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Wentzville
Alton
Glencoe
Eureka
Festus
Edwardsville
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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