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Cheap flights from London Heathrow Airport to St. Louis from $479

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 2/19. 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

Enter your travel dates to find the best prices.
Virgin Atlantic Logo
11:45 am - 11:37 pm
LHR
-
STL
17h 52m2 stops
Virgin Atlantic Logo
11:23 am - 7:05 am
STL
-
LHR
13h 42m1 stop
$696Virgin Atlantic
Tue, Jan 20 - Tue, Jan 27
British Airways Logo
8:20 am - 4:14 pm
LHR
-
STL
13h 54m1 stop
British Airways Logo
12:11 pm - 6:30 am
STL
-
LHR
12h 19m1 stop
$704British Airways
Tue, Jan 20 - Tue, Jan 27
Finnair Logo
5:00 pm - 9:03 am
LHR
-
STL
22h 03m2 stops
Finnair Logo
2:54 pm - 9:40 am
STL
-
LHR
12h 46m2 stops
$716Finnair
Tue, Jan 20 - Tue, Jan 27
Virgin Atlantic Logo
10:00 am - 11:39 pm
LHR
-
STL
19h 39m2 stops
Virgin Atlantic Logo
3:45 pm - 11:40 am
STL
-
LHR
13h 55m1 stop
$722Virgin Atlantic
Tue, Jan 13 - Fri, Jan 23
Multiple Airlines Logo
11:45 am - 6:34 pm
LHR
-
STL
12h 49m1 stop
Multiple Airlines Logo
2:54 pm - 7:00 am
STL
-
LHR
10h 06m1 stop
$729Multiple Airlines
Mon, Jan 12 - Mon, Jan 26
Delta Logo
6:30 am - 4:07 pm
LHR
-
STL
15h 37m2 stops
Delta Logo
7:10 am - 6:25 am
STL
-
LHR
17h 15m1 stop
$736Delta
Wed, Jan 21 - Wed, Jan 28
Virgin Atlantic Logo
10:00 am - 11:39 pm
LHR
-
STL
19h 39m2 stops
Virgin Atlantic Logo
5:00 pm - 7:50 am
STL
-
LHR
32h 50m1 stop
$737Virgin Atlantic
Thu, Jan 15 - Sun, Jan 18
Virgin Atlantic Logo
10:45 am - 11:39 pm
LHR
-
STL
18h 54m1 stop
Virgin Atlantic Logo
6:10 am - 7:05 am
STL
-
LHR
18h 55m1 stop
$739Virgin Atlantic
Tue, Jan 13 - Fri, Jan 23
British Airways Logo
7:30 am - 9:15 pm
LHR
-
STL
19h 45m2 stops
British Airways Logo
5:04 pm - 12:15 pm
STL
-
LHR
13h 11m1 stop
$743British Airways
Thu, Jan 22 - Mon, Jan 26
British Airways Logo
2:45 pm - 11:12 pm
LHR
-
STL
14h 27m1 stop
British Airways Logo
1:35 pm - 6:55 am
STL
-
LHR
11h 20m1 stop
$744British Airways
Tue, Jan 13 - Fri, Jan 23

Virgin Atlantic flights from London Heathrow Airport to St. Louis

Our best Virgin Atlantic deals on London Heathrow Airport to St. Louis flight tickets
Virgin Atlantic
Jan 20
LHR11:45 amLondon Heathrow
17h 52m
2 stops
STL11:37 pmLambert-St Louis
Jan 27
STL11:23 amLambert-St Louis
13h 42m
1 stop
LHR7:05 amLondon Heathrow
$696
Find similar
Virgin Atlantic
Jan 13
LHR10:00 amLondon Heathrow
19h 39m
2 stops
STL11:39 pmLambert-St Louis
Jan 23
STL3:45 pmLambert-St Louis
13h 55m
1 stop
LHR11:40 amLondon Heathrow
$722
Find similar
Virgin Atlantic
Jan 15
LHR10:00 amLondon Heathrow
19h 39m
2 stops
STL11:39 pmLambert-St Louis
Jan 18
STL5:00 pmLambert-St Louis
32h 50m
1 stop
LHR7:50 amLondon Heathrow
$737
Find similar

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
Jan 20
LHR8:20 amLondon Heathrow
13h 54m
1 stop
STL4:14 pmLambert-St Louis
Jan 27
STL12:11 pmLambert-St Louis
12h 19m
1 stop
LHR6:30 amLondon Heathrow
$704
Find similar
British Airways
Jan 22
LHR7:30 amLondon Heathrow
19h 45m
2 stops
STL9:15 pmLambert-St Louis
Jan 26
STL5:04 pmLambert-St Louis
13h 11m
1 stop
LHR12:15 pmLondon Heathrow
$743
Find similar
British Airways
Jan 13
LHR2:45 pmLondon Heathrow
14h 27m
1 stop
STL11:12 pmLambert-St Louis
Jan 23
STL1:35 pmLambert-St Louis
11h 20m
1 stop
LHR6:55 amLondon Heathrow
$744
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 December 8, 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

Tue 1/20

11:45 am-11:37 pm

2 stops17h 52m

Lambert-St Louis

Tue 1/27

11:23 am-7:05 am

1 stop13h 42m

$696

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/20

8:20 am-4:14 pm

1 stop13h 54m

Lambert-St Louis

Tue 1/27

12:11 pm-6:30 am

1 stop12h 19m

$704

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/20

5:00 pm-9:03 am

2 stops22h 03m

Lambert-St Louis

Tue 1/27

2:54 pm-9:40 am

2 stops12h 46m

$716

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

10:00 am-11:39 pm

2 stops19h 39m

Lambert-St Louis

Fri 1/23

3:45 pm-11:40 am

1 stop13h 55m

$722

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 1/12

11:45 am-6:34 pm

1 stop12h 49m

Lambert-St Louis

Mon 1/26

2:54 pm-7:00 am

1 stop10h 06m

$729

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 1/21

6:30 am-4:07 pm

2 stops15h 37m

Lambert-St Louis

Wed 1/28

7:10 am-6:25 am

1 stop17h 15m

$736

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/15

10:00 am-11:39 pm

2 stops19h 39m

Lambert-St Louis

Sun 1/18

5:00 pm-7:50 am

1 stop32h 50m

$737

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

10:45 am-11:39 pm

1 stop18h 54m

Lambert-St Louis

Fri 1/23

6:10 am-7:05 am

1 stop18h 55m

$739

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/22

7:30 am-9:15 pm

2 stops19h 45m

Lambert-St Louis

Mon 1/26

5:04 pm-12:15 pm

1 stop13h 11m

$743

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

2:45 pm-11:12 pm

1 stop14h 27m

Lambert-St Louis

Fri 1/23

1:35 pm-6:55 am

1 stop11h 20m

$744

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 $759. 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 $979 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 $851 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 December 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

Mon, Wed, Thu and Sat

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 Monday, Wednesday, Thursday and Saturday. The only airline offering direct flights is Finnair.
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
7,564 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
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
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.
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