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Cheap flights from London Heathrow Airport to St. Louis from $460

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 1/16. 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.
British Airways Logo
3:00 pm - 10:59 pmLHR-STL
13h 59m1 stop
British Airways Logo
11:34 am - 6:30 amSTL-LHR
12h 56m1 stop
$699British Airways
Find Deal
Wed, Jan 28 - Wed, Feb 25
Finnair Logo
11:55 am - 7:29 pmLHR-STL
13h 34m1 stop
Finnair Logo
6:00 am - 7:50 amSTL-LHR
19h 50m1 stop
$701Finnair
Find Deal
Tue, Dec 9 - Tue, Dec 16
Finnair Logo
3:35 pm - 9:03 amLHR-STL
23h 28m2 stops
Finnair Logo
11:34 am - 6:20 amSTL-LHR
12h 46m2 stops
$709Finnair
Find Deal
Tue, Jan 27 - Tue, Feb 17
Virgin Atlantic Logo
12:30 pm - 11:39 pmLHR-STL
17h 09m1 stop
Virgin Atlantic Logo
12:00 pm - 7:50 amSTL-LHR
13h 50m1 stop
$715Virgin Atlantic
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Tue, Jan 13 - Fri, Jan 23
Virgin Atlantic Logo
10:45 am - 7:12 pmLHR-STL
14h 27m1 stop
Virgin Atlantic Logo
12:00 pm - 7:50 amSTL-LHR
13h 50m1 stop
$718Virgin Atlantic
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Tue, Jan 13 - Fri, Jan 23
Delta Logo
6:30 am - 8:47 pmLHR-STL
20h 17m2 stops
Delta Logo
2:02 pm - 6:25 amSTL-LHR
10h 23m1 stop
$719Delta
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Wed, Dec 10 - Wed, Dec 17
Delta Logo
6:30 am - 6:33 pmLHR-STL
18h 03m2 stops
Delta Logo
10:45 am - 6:25 amSTL-LHR
13h 40m2 stops
$722Delta
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Tue, Dec 9 - Tue, Dec 16
Finnair Logo
11:00 am - 11:24 pmLHR-STL
18h 24m2 stops
Finnair Logo
9:15 am - 6:20 amSTL-LHR
15h 05m2 stops
$725Finnair
Find Deal
Wed, Apr 22 - Wed, May 6
British Airways Logo
6:45 am - 10:44 pmLHR-STL
21h 59m2 stops
British Airways Logo
11:05 am - 6:55 amSTL-LHR
13h 50m1 stop
$731British Airways
Find Deal
Wed, Jan 7 - Wed, Jan 14
British Airways Logo
6:45 am - 10:44 pmLHR-STL
21h 59m2 stops
British Airways Logo
2:54 pm - 7:00 amSTL-LHR
10h 06m1 stop
$732British Airways
Find Deal
Wed, Jan 7 - Wed, Jan 14

Finnair flights from London Heathrow Airport to St. Louis

Our best Finnair deals on London Heathrow Airport to St. Louis flight tickets
Finnair
Dec 9
LHR11:55 amLondon Heathrow
13h 34m
1 stop
STL7:29 pmLambert-St Louis
Dec 16
STL6:00 amLambert-St Louis
19h 50m
1 stop
LHR7:50 amLondon Heathrow
$701
Find similar
Finnair
Jan 27
LHR3:35 pmLondon Heathrow
23h 28m
2 stops
STL9:03 amLambert-St Louis
Feb 17
STL11:34 amLambert-St Louis
12h 46m
2 stops
LHR6:20 amLondon Heathrow
$709
Find similar
Finnair
Apr 22
LHR11:00 amLondon Heathrow
18h 24m
2 stops
STL11:24 pmLambert-St Louis
May 6
STL9:15 amLambert-St Louis
15h 05m
2 stops
LHR6:20 amLondon Heathrow
$725
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
Dec 10
LHR6:30 amLondon Heathrow
20h 17m
2 stops
STL8:47 pmLambert-St Louis
Dec 17
STL2:02 pmLambert-St Louis
10h 23m
1 stop
LHR6:25 amLondon Heathrow
$719
Find similar
Delta
Dec 9
LHR6:30 amLondon Heathrow
18h 03m
2 stops
STL6:33 pmLambert-St Louis
Dec 16
STL10:45 amLambert-St Louis
13h 40m
2 stops
LHR6:25 amLondon Heathrow
$722
Find similar
Delta
Dec 10
LHR8:55 amLondon Heathrow
19h 02m
1 stop
STL9:57 pmLambert-St Louis
Dec 17
STL2:02 pmLambert-St Louis
10h 23m
1 stop
LHR6:25 amLondon Heathrow
$737
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 November 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

Wed 1/28

3:00 pm-10:59 pm

1 stop13h 59m

Lambert-St Louis

Wed 2/25

11:34 am-6:30 am

1 stop12h 56m

$699

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/9

11:55 am-7:29 pm

1 stop13h 34m

Lambert-St Louis

Tue 12/16

6:00 am-7:50 am

1 stop19h 50m

$701

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/27

3:35 pm-9:03 am

2 stops23h 28m

Lambert-St Louis

Tue 2/17

11:34 am-6:20 am

2 stops12h 46m

$709

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

12:30 pm-11:39 pm

1 stop17h 09m

Lambert-St Louis

Fri 1/23

12:00 pm-7:50 am

1 stop13h 50m

$715

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

10:45 am-7:12 pm

1 stop14h 27m

Lambert-St Louis

Fri 1/23

12:00 pm-7:50 am

1 stop13h 50m

$718

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 12/10

6:30 am-8:47 pm

2 stops20h 17m

Lambert-St Louis

Wed 12/17

2:02 pm-6:25 am

1 stop10h 23m

$719

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/9

6:30 am-6:33 pm

2 stops18h 03m

Lambert-St Louis

Tue 12/16

10:45 am-6:25 am

2 stops13h 40m

$722

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/22

11:00 am-11:24 pm

2 stops18h 24m

Lambert-St Louis

Wed 5/6

9:15 am-6:20 am

2 stops15h 05m

$725

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 1/7

6:45 am-10:44 pm

2 stops21h 59m

Lambert-St Louis

Wed 1/14

11:05 am-6:55 am

1 stop13h 50m

$731

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 1/7

6:45 am-10:44 pm

2 stops21h 59m

Lambert-St Louis

Wed 1/14

2:54 pm-7:00 am

1 stop10h 06m

$732

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 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 March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $864.

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 $983 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 $897 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 November 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

Wed

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 Wednesday. There are no airlines offering direct flights.
There is 1 airport near St. Louis: 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
7,520 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,572 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
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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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