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Cheap flights from London to St. Louis from $344

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 to St. Louis departing on 4/22. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from London to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:00 pm - 11:19 pm
LGW
-
STL
15h 19m
1 stop
Multiple Airlines Logo
4:59 pm - 10:00 am
STL
-
LGW
35h 01m
1 stop
$777Multiple Airlines
Wed, Apr 22 - Sat, Apr 25
Finnair Logo
8:55 am - 7:30 pm
LHR
-
STL
16h 35m
1 stop
Finnair Logo
12:27 pm - 2:25 pm
STL
-
LHR
19h 58m
1 stop
$808Finnair
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
2:00 pm - 11:19 pm
LGW
-
STL
15h 19m
1 stop
Multiple Airlines Logo
9:18 pm - 10:00 am
STL
-
LGW
30h 42m
2 stops
$810Multiple Airlines
Mon, May 4 - Fri, May 8
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$815British Airways
Wed, Sep 2 - Wed, Sep 23
Virgin Atlantic Logo
9:20 am - 5:44 pm
LHR
-
STL
14h 24m
1 stop
Virgin Atlantic Logo
5:35 pm - 1:05 pm
STL
-
LHR
13h 30m
1 stop
$816Virgin Atlantic
Wed, Apr 29 - Wed, May 6
British Airways Logo
10:05 am - 6:15 pm
LHR
-
STL
14h 10m
1 stop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$817British Airways
Mon, Sep 21 - Wed, Sep 30
Multiple Airlines Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
Multiple Airlines Logo
3:33 pm - 12:50 pm
STL
-
LHR
15h 17m
1 stop
$819Multiple Airlines
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$820British Airways
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$822British Airways
Wed, Sep 2 - Wed, Sep 23
Iberia Logo
7:15 pm - 6:02 pm
LCY
-
STL
28h 47m
2 stops
Iberia Logo
9:46 am - 9:10 am
STL
-
LCY
17h 24m
2 stops
$1,094Iberia
Mon, Sep 21 - Wed, Sep 30

British Airways flights from London to St. Louis

Our best British Airways deals on London to St. Louis flight tickets
British Airways
Sep 2
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 23
STL4:47 pmLambert-St Louis
10h 38m
1 stop
LHR9:25 amLondon Heathrow
$815
British Airways
Sep 21
LHR10:05 amLondon Heathrow
14h 10m
1 stop
STL6:15 pmLambert-St Louis
Sep 30
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$817
British Airways
Sep 2
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 23
STL4:47 pmLambert-St Louis
10h 38m
1 stop
LHR9:25 amLondon Heathrow
$820

American Airlines flights from London to St. Louis

Our best American Airlines deals on London to St. Louis flight tickets
American Airlines
Sep 22
LHR9:15 amLondon Heathrow
12h 12m
1 stop
STL3:27 pmLambert-St Louis
Sep 29
STL5:46 pmLambert-St Louis
10h 34m
1 stop
LHR10:20 amLondon Heathrow
$844
American Airlines
Sep 22
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Oct 1
STL2:45 pmLambert-St Louis
10h 05m
1 stop
LHR6:50 amLondon Heathrow
$861
American Airlines
Sep 19
LHR9:15 amLondon Heathrow
12h 12m
1 stop
STL3:27 pmLambert-St Louis
Sep 29
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$884

momondo Fare Finder

 
Customize your flight search to find flights from London 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 April 2, 2026.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Wed 4/22

2:00 pm-11:19 pm

1 stop15h 19m

Lambert-St Louis

Sat 4/25

4:59 pm-10:00 am

1 stop35h 01m

$777

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/29

8:55 am-7:30 pm

1 stop16h 35m

Lambert-St Louis

Wed 5/6

12:27 pm-2:25 pm

1 stop19h 58m

$808

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 5/4

2:00 pm-11:19 pm

1 stop15h 19m

Lambert-St Louis

Fri 5/8

9:18 pm-10:00 am

2 stops30h 42m

$810
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$815

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/29

9:20 am-5:44 pm

1 stop14h 24m

Lambert-St Louis

Wed 5/6

5:35 pm-1:05 pm

1 stop13h 30m

$816

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 9/21

10:05 am-6:15 pm

1 stop14h 10m

Lambert-St Louis

Wed 9/30

9:35 pm-11:35 am

Nonstop8h 00m

$817

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/23

3:33 pm-12:50 pm

1 stop15h 17m

$819

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$820

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$822

LondonSt. Louis

LCY - STL

LCYSTL

London City

Mon 9/21

7:15 pm-6:02 pm

2 stops28h 47m

Lambert-St Louis

Wed 9/30

9:46 am-9:10 am

2 stops17h 24m

$1,094

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 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 and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, January is the cheapest month to fly from London to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $919. The month of February is another great option to travel to St. Louis, with average flight prices from London averaging around $919.

What is the cheapest London to Lambert-St Louis flight route?

Fly from London Heathrow to Lambert-St Louis for the best London - 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 when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $988 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 for as low as $869 on momondo.

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

There are 3 cabin classes available to choose from on London 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 to St. Louis flights?

You could potentially save up to 16% on your flight if you consider stops on a London to St. Louis flight.

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

As of April 2026, prices for London to St. Louis flights are approximately 33% cheaper when compared to flights at the same time last year.

When to book flights from London to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from London to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap London to St. Louis (LON to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London 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 to St. Louis takes 9h 05m
Direct flights go from London 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 there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from London to St. Louis

  • How far is London to Lambert-St Louis by plane?

    Lambert-St Louis is 4197.7 mi away from London. By plane, this route typically takes 9h 05m.

  • When did momondo last update prices for flights from London to Lambert-St Louis Airport?

    Prices for flights from London to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from London to Lambert-St Louis Airport?

  • How old do you have to be to fly from London 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 to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to St. Louis?

Best airlines flying from London to St. Louis

Compare and see reviews for airlines that fly from London to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $555Free CancellationRating
6.7
7,841 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,533 reviews
Search United Airlines 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
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Clayton
Festus
Eureka
Edwardsville
Litchfield
Shrewsbury
Grafton

Why use momondo?

Why should I use momondo to find a flight deal from London to St. Louis?

Finding the right flight to St. Louis from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

Can I find flights from London to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from London to St. Louis?

Once all potential London to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?

Price alerts on flights to St. Louis from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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