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Cheap flights from London to St. Louis from $414

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 5/1. 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 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
8:12 pm - 10:00 am
STL
-
LGW
31h 48m
2 stops
$690Multiple Airlines
Fri, Apr 24 - Fri, May 8
Virgin Atlantic Logo
10:45 am - 4:42 pm
LHR
-
STL
11h 57m
1 stop
Virgin Atlantic Logo
1:02 pm - 7:15 am
STL
-
LHR
12h 13m
1 stop
$703Virgin Atlantic
Mon, Apr 13 - Mon, Apr 20
Virgin Atlantic Logo
11:15 am - 5:44 pm
LHR
-
STL
12h 29m
1 stop
Virgin Atlantic Logo
1:03 pm - 7:15 am
STL
-
LHR
12h 12m
1 stop
$709Virgin Atlantic
Tue, Apr 21 - Wed, Apr 29
Finnair Logo
11:00 am - 10:17 pm
LHR
-
STL
17h 17m
2 stops
Finnair Logo
11:06 am - 9:00 am
STL
-
LHR
15h 54m
1 stop
$715Finnair
Mon, Apr 13 - Mon, Apr 20
British Airways Logo
7:25 pm - 7:33 pm
LHR
-
STL
30h 08m
2 stops
British Airways Logo
8:03 pm - 12:15 pm
STL
-
LHR
10h 12m
1 stop
$727British Airways
Mon, Apr 13 - Tue, Apr 21
Finnair Logo
6:10 pm - 10:17 pm
LHR
-
STL
34h 07m
2 stops
Finnair Logo
5:21 pm - 7:40 am
STL
-
LHR
32h 19m
1 stop
$728Finnair
Sun, Apr 19 - Sun, Apr 26
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
$730British Airways
Tue, Apr 21 - Wed, Apr 29
Delta Logo
10:35 am - 9:19 pm
LGW
-
STL
16h 44m
2 stops
Delta Logo
1:03 pm - 9:25 am
STL
-
LGW
14h 22m
2 stops
$779Delta
Tue, Apr 21 - Wed, Apr 29
Delta Logo
10:25 am - 9:19 pm
LGW
-
STL
16h 54m
2 stops
Delta Logo
1:03 pm - 9:25 am
STL
-
LGW
14h 22m
2 stops
$780Delta
Wed, Apr 15 - Wed, Apr 22
KLM Logo
8:45 pm - 3:32 pm
LCY
-
STL
48h 47m
2 stops
KLM Logo
7:01 pm - 4:40 pm
STL
-
LCY
15h 39m
2 stops
$844KLM
Sun, Apr 26 - Sun, May 10

Delta flights from London to St. Louis

Our best Delta deals on London to St. Louis flight tickets
Delta
Apr 14
LHR8:40 amLondon Heathrow
18h 39m
2 stops
STL9:19 pmLambert-St Louis
Apr 21
STL11:42 amLambert-St Louis
13h 28m
2 stops
LHR7:10 amLondon Heathrow
$758
Delta
Apr 21
LHR11:45 amLondon Heathrow
17h 51m
2 stops
STL11:36 pmLambert-St Louis
Apr 27
STL11:42 amLambert-St Louis
13h 28m
2 stops
LHR7:10 amLondon Heathrow
$759
Delta
Apr 13
LHR11:45 amLondon Heathrow
17h 51m
2 stops
STL11:36 pmLambert-St Louis
Apr 20
STL10:50 amLambert-St Louis
16h 00m
2 stops
LHR8:50 amLondon Heathrow
$761

Turkish Airlines flights from London to St. Louis

Our best Turkish Airlines deals on London to St. Louis flight tickets
Turkish Airlines
Mar 11
LGW5:05 pmLondon Gatwick
33h 02m
2 stops
STL9:07 pmLambert-St Louis
Mar 30
STL7:45 amLambert-St Louis
44h 10m
2 stops
LGW9:55 amLondon Gatwick
$1,460
Turkish Airlines
Apr 21
STN5:35 pmLondon Stansted
33h 38m
2 stops
STL9:13 pmLambert-St Louis
Apr 27
STL7:45 amLambert-St Louis
32h 25m
2 stops
STN10:10 pmLondon Stansted
$1,473

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 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

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 4/24

2:00 pm-11:19 pm

1 stop15h 19m

Lambert-St Louis

Fri 5/8

8:12 pm-10:00 am

2 stops31h 48m

$690

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/13

10:45 am-4:42 pm

1 stop11h 57m

Lambert-St Louis

Mon 4/20

1:02 pm-7:15 am

1 stop12h 13m

$703

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/21

11:15 am-5:44 pm

1 stop12h 29m

Lambert-St Louis

Wed 4/29

1:03 pm-7:15 am

1 stop12h 12m

$709

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/13

11:00 am-10:17 pm

2 stops17h 17m

Lambert-St Louis

Mon 4/20

11:06 am-9:00 am

1 stop15h 54m

$715

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/13

7:25 pm-7:33 pm

2 stops30h 08m

Lambert-St Louis

Tue 4/21

8:03 pm-12:15 pm

1 stop10h 12m

$727

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 4/19

6:10 pm-10:17 pm

2 stops34h 07m

Lambert-St Louis

Sun 4/26

5:21 pm-7:40 am

1 stop32h 19m

$728

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/21

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 4/29

9:35 pm-11:35 am

Nonstop8h 00m

$730

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 4/21

10:35 am-9:19 pm

2 stops16h 44m

Lambert-St Louis

Wed 4/29

1:03 pm-9:25 am

2 stops14h 22m

$779

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Wed 4/15

10:25 am-9:19 pm

2 stops16h 54m

Lambert-St Louis

Wed 4/22

1:03 pm-9:25 am

2 stops14h 22m

$780

LondonSt. Louis

LCY - STL

LCYSTL

London City

Sun 4/26

8:45 pm-3:32 pm

2 stops48h 47m

Lambert-St Louis

Sun 5/10

7:01 pm-4:40 pm

2 stops15h 39m

$844

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, March 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 $745. The month of February is another great option to travel to St. Louis, with average flight prices from London averaging around $875.

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 $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 for as low as $867 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 1% 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

Best Price Found

$537

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from London in the past 72 hours is $537. The best round-trip flight deal from London to St. Louis found on momondo in the last 72 hours is $803.
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
7,774 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,376 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
St. Peters
Wentzville
Collinsville
Alton
Fenton
Farmington
Edwardsville
Festus
Clayton
Eureka
Litchfield
Glencoe
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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