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Cheap flights from London to St. Louis from $369

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 5/8. 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.
American Airlines Logo
12:00 pm - 7:30 pm
LHR
-
STL
13h 30m
1 stop
American Airlines Logo
1:45 pm - 10:30 am
STL
-
LHR
14h 45m
1 stop
$666American Airlines
Wed, May 13 - Sat, May 23
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$683British Airways
Wed, May 13 - Wed, May 27
Delta Logo
9:20 am - 5:46 pm
LHR
-
STL
14h 26m
1 stop
Delta Logo
4:20 pm - 10:20 am
STL
-
LHR
12h 00m
1 stop
$686Delta
Wed, May 13 - Wed, May 27
American Airlines Logo
12:15 pm - 7:33 pm
LHR
-
STL
13h 18m
1 stop
American Airlines Logo
5:22 pm - 10:30 am
STL
-
LHR
11h 08m
1 stop
$687American Airlines
Wed, May 13 - Sat, May 23
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$692British Airways
Fri, May 15 - Wed, May 27
American Airlines Logo
9:45 am - 7:33 pm
LHR
-
STL
15h 48m
1 stop
American Airlines Logo
1:45 pm - 10:30 am
STL
-
LHR
14h 45m
1 stop
$696American Airlines
Thu, May 14 - Sat, May 23
Delta Logo
9:20 am - 4:10 pm
LHR
-
STL
12h 50m
1 stop
Delta Logo
10:15 am - 7:10 am
STL
-
LHR
14h 55m
1 stop
$707Delta
Wed, May 13 - Mon, May 25
Air France Logo
10:35 am - 9:19 pm
LGW
-
STL
16h 44m
2 stops
Air France Logo
1:02 pm - 9:25 am
STL
-
LGW
14h 23m
2 stops
$835Air France
Tue, Apr 28 - Tue, May 5
Air France Logo
10:35 am - 9:19 pm
LGW
-
STL
16h 44m
2 stops
Air France Logo
1:02 pm - 9:40 am
STL
-
LGW
14h 38m
2 stops
$836Air France
Tue, Apr 21 - Mon, Apr 27
Iberia Logo
7:15 pm - 7:33 pm
LCY
-
STL
30h 18m
2 stops
Iberia Logo
11:14 am - 3:15 pm
STL
-
LCY
22h 01m
2 stops
$926Iberia
Mon, Apr 27 - Mon, May 4

United Airlines flights from London to St. Louis

Our best United Airlines deals on London to St. Louis flight tickets
United Airlines
Mar 21
LHR6:30 amLondon Heathrow
20h 12m
2 stops
STL9:42 pmLambert-St Louis
Mar 24
STL11:25 amLambert-St Louis
13h 55m
2 stops
LHR6:20 amLondon Heathrow
$1,597
United Airlines
Mar 21
LHR8:30 amLondon Heathrow
15h 44m
2 stops
STL7:14 pmLambert-St Louis
Apr 18
STL4:05 pmLambert-St Louis
46h 55m
2 stops
LHR9:00 pmLondon Heathrow
$1,619
United Airlines
Mar 29
LHR11:05 amLondon Heathrow
12h 46m
1 stop
STL5:51 pmLambert-St Louis
May 28
STL1:13 pmLambert-St Louis
11h 32m
1 stop
LHR6:45 amLondon Heathrow
$1,661

Finnair flights from London to St. Louis

Our best Finnair deals on London to St. Louis flight tickets
Finnair
Sep 2
LHR3:00 pmLondon Heathrow
14h 55m
1 stop
STL11:55 pmLambert-St Louis
Sep 23
STL6:55 pmLambert-St Louis
29h 30m
2 stops
LHR6:25 amLondon Heathrow
$758
Finnair
Apr 20
LHR9:15 amLondon Heathrow
14h 49m
1 stop
STL6:04 pmLambert-St Louis
Apr 30
STL2:12 pmLambert-St Louis
10h 43m
1 stop
LHR6:55 amLondon Heathrow
$768
Finnair
May 12
LHR11:00 amLondon Heathrow
17h 19m
2 stops
STL10:19 pmLambert-St Louis
May 20
STL6:54 pmLambert-St Louis
29h 31m
2 stops
LHR6:25 amLondon Heathrow
$773

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 March 17, 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

LHR - STL

LHRSTL

London Heathrow

Wed 5/13

12:00 pm-7:30 pm

1 stop13h 30m

Lambert-St Louis

Sat 5/23

1:45 pm-10:30 am

1 stop14h 45m

$666
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 5/13

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 5/27

9:35 pm-11:35 am

Nonstop8h 00m

$683

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 5/13

9:20 am-5:46 pm

1 stop14h 26m

Lambert-St Louis

Wed 5/27

4:20 pm-10:20 am

1 stop12h 00m

$686

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 5/13

12:15 pm-7:33 pm

1 stop13h 18m

Lambert-St Louis

Sat 5/23

5:22 pm-10:30 am

1 stop11h 08m

$687

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 5/15

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 5/27

9:35 pm-11:35 am

Nonstop8h 00m

$692

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 5/14

9:45 am-7:33 pm

1 stop15h 48m

Lambert-St Louis

Sat 5/23

1:45 pm-10:30 am

1 stop14h 45m

$696

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 5/13

9:20 am-4:10 pm

1 stop12h 50m

Lambert-St Louis

Mon 5/25

10:15 am-7:10 am

1 stop14h 55m

$707

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 4/28

10:35 am-9:19 pm

2 stops16h 44m

Lambert-St Louis

Tue 5/5

1:02 pm-9:25 am

2 stops14h 23m

$835

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 4/21

10:35 am-9:19 pm

2 stops16h 44m

Lambert-St Louis

Mon 4/27

1:02 pm-9:40 am

2 stops14h 38m

$836

LondonSt. Louis

LCY - STL

LCYSTL

London City

Mon 4/27

7:15 pm-7:33 pm

2 stops30h 18m

Lambert-St Louis

Mon 5/4

11:14 am-3:15 pm

2 stops22h 01m

$926

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 13% 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 March 2026, prices for London to St. Louis flights are approximately 21% 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

  • 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?

  • What is the most popular airline 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
7,797 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,431 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
Florissant
Maryland Heights
O'Fallon
Collinsville
Alton
St. Peters
Wentzville
Fenton
Farmington
Clayton
Edwardsville
Festus
Eureka
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.

An easier way to manage your St. Louis trip

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