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Cheap flights from London Heathrow Airport to St. Louis from $448

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 2/2. 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

Enter your travel dates to find the best prices.
United Airlines Logo
7:25 am - 5:43 pm
LHR
-
STL
16h 18m1 stop
United Airlines Logo
11:20 am - 5:55 am
STL
-
LHR
12h 35m1 stop
$471United Airlines
Tue, Jan 20 - Wed, Feb 4
United Airlines Logo
9:00 am - 9:13 pm
LHR
-
STL
18h 13m2 stops
United Airlines Logo
1:15 pm - 10:25 am
STL
-
LHR
15h 10m2 stops
$597United Airlines
Mon, Feb 2 - Mon, Feb 9
Multiple Airlines Logo
6:30 am - 1:25 pm
LHR
-
STL
12h 55m1 stop
Multiple Airlines Logo
1:10 pm - 9:00 am
STL
-
LHR
13h 50m1 stop
$599Multiple Airlines
Wed, Apr 15 - Sun, Apr 19
Multiple Airlines Logo
12:05 pm - 3:29 pm
LHR
-
STL
57h 24m2 stops
Multiple Airlines Logo
1:11 pm - 7:55 am
STL
-
LHR
12h 44m1 stop
$602Multiple Airlines
Mon, Feb 9 - Mon, Feb 16
United Airlines Logo
8:30 am - 7:27 pm
LHR
-
STL
16h 57m2 stops
United Airlines Logo
11:20 am - 8:25 am
STL
-
LHR
15h 05m2 stops
$603United Airlines
Thu, Jan 22 - Thu, Jan 29
Virgin Atlantic Logo
10:45 am - 8:37 pm
LHR
-
STL
15h 52m1 stop
Virgin Atlantic Logo
6:10 am - 7:05 am
STL
-
LHR
18h 55m1 stop
$604Virgin Atlantic
Mon, Feb 2 - Mon, Feb 16
United Airlines Logo
6:50 am - 4:03 pm
LHR
-
STL
15h 13m2 stops
United Airlines Logo
1:15 pm - 7:55 am
STL
-
LHR
12h 40m1 stop
$605United Airlines
Thu, Feb 5 - Mon, Feb 9
British Airways Logo
2:10 pm - 9:15 pm
LHR
-
STL
13h 05m1 stop
British Airways Logo
5:04 pm - 11:40 am
STL
-
LHR
12h 36m1 stop
$610British Airways
Mon, Feb 2 - Mon, Feb 9
Lufthansa Logo
12:05 pm - 8:23 pm
LHR
-
STL
14h 18m1 stop
Lufthansa Logo
11:39 am - 6:20 am
STL
-
LHR
12h 41m1 stop
$612Lufthansa
Thu, Feb 19 - Thu, Feb 26
United Airlines Logo
3:30 pm - 1:55 pm
LHR
-
STL
28h 25m1 stop
United Airlines Logo
1:15 pm - 7:55 am
STL
-
LHR
12h 40m1 stop
$618United Airlines
Thu, Jan 22 - Thu, Jan 29

Lufthansa flights from London Heathrow Airport to St. Louis

Our best Lufthansa deals on London Heathrow Airport to St. Louis flight tickets
Lufthansa
Jan 22
LHR11:10 amLondon Heathrow
17h 48m
2 stops
STL10:58 pmLambert-St Louis
Jan 26
STL6:40 pmLambert-St Louis
10h 35m
1 stop
LHR11:15 amLondon Heathrow
$601
Find similar
Lufthansa
Feb 19
LHR12:05 pmLondon Heathrow
14h 18m
1 stop
STL8:23 pmLambert-St Louis
Feb 26
STL11:39 amLambert-St Louis
12h 41m
1 stop
LHR6:20 amLondon Heathrow
$612
Find similar
Lufthansa
Jan 22
LHR6:30 pmLondon Heathrow
25h 25m
1 stop
STL1:55 pmLambert-St Louis
Jan 26
STL6:40 pmLambert-St Louis
10h 35m
1 stop
LHR11:15 amLondon Heathrow
$617
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
Jan 19
LHR10:00 amLondon Heathrow
16h 43m
2 stops
STL8:43 pmLambert-St Louis
Feb 2
STL3:45 pmLambert-St Louis
13h 55m
1 stop
LHR11:40 amLondon Heathrow
$641
Find similar
Delta
Jan 13
LHR8:55 amLondon Heathrow
20h 44m
1 stop
STL11:39 pmLambert-St Louis
May 10
STL5:00 pmLambert-St Louis
15h 35m
1 stop
LHR2:35 pmLondon Heathrow
$1,458
Find similar
Delta
Jan 7
LHR11:30 amLondon Heathrow
18h 09m
2 stops
STL11:39 pmLambert-St Louis
Jan 14
STL9:59 amLambert-St Louis
14h 26m
1 stop
LHR6:25 amLondon Heathrow
$1,466
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 January 6, 2026.
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

7:25 am-5:43 pm

1 stop16h 18m

Lambert-St Louis

Wed 2/4

11:20 am-5:55 am

1 stop12h 35m

$471

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/2

9:00 am-9:13 pm

2 stops18h 13m

Lambert-St Louis

Mon 2/9

1:15 pm-10:25 am

2 stops15h 10m

$597

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/15

6:30 am-1:25 pm

1 stop12h 55m

Lambert-St Louis

Sun 4/19

1:10 pm-9:00 am

1 stop13h 50m

$599

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/9

12:05 pm-3:29 pm

2 stops57h 24m

Lambert-St Louis

Mon 2/16

1:11 pm-7:55 am

1 stop12h 44m

$602

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/22

8:30 am-7:27 pm

2 stops16h 57m

Lambert-St Louis

Thu 1/29

11:20 am-8:25 am

2 stops15h 05m

$603

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/2

10:45 am-8:37 pm

1 stop15h 52m

Lambert-St Louis

Mon 2/16

6:10 am-7:05 am

1 stop18h 55m

$604

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/5

6:50 am-4:03 pm

2 stops15h 13m

Lambert-St Louis

Mon 2/9

1:15 pm-7:55 am

1 stop12h 40m

$605

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/2

2:10 pm-9:15 pm

1 stop13h 05m

Lambert-St Louis

Mon 2/9

5:04 pm-11:40 am

1 stop12h 36m

$610

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/19

12:05 pm-8:23 pm

1 stop14h 18m

Lambert-St Louis

Thu 2/26

11:39 am-6:20 am

1 stop12h 41m

$612

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/22

3:30 pm-1:55 pm

1 stop28h 25m

Lambert-St Louis

Thu 1/29

1:15 pm-7:55 am

1 stop12h 40m

$618

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 $747. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $872.

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 $978 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 $819 on momondo.

What cabin class options are available on London Heathrow to Lambert-St Louis flights?

There are 2 cabin classes 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 January 2026, prices for London Heathrow Airport to St. Louis flights are approximately 12% cheaper 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. There are no airlines offering direct flights.
There is 1 airport in St. Louis. From London Heathrow Airport there are direct flights to 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
7,657 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
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
Glencoe
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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