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Cheap flights from London to St. Louis from $359

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 3/12. 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 - 7:11 pm
LGW
-
STL
34h 11m
2 stops
Multiple Airlines Logo
7:47 am - 10:00 am
STL
-
LGW
21h 13m
1 stop
$616Multiple Airlines
Mon, Mar 9 - Mon, Mar 23
Multiple Airlines Logo
2:00 pm - 11:19 pm
LGW
-
STL
14h 19m
1 stop
Multiple Airlines Logo
7:47 am - 10:00 am
STL
-
LGW
21h 13m
1 stop
$639Multiple Airlines
Mon, Mar 9 - Mon, Mar 23
Multiple Airlines Logo
2:00 pm - 11:19 pm
LGW
-
STL
14h 19m
1 stop
Multiple Airlines Logo
12:16 pm - 10:05 am
STL
-
LGW
40h 49m
2 stops
$641Multiple Airlines
Fri, Mar 13 - Fri, Mar 20
Delta Logo
11:45 am - 11:58 pm
LHR
-
STL
17h 13m
2 stops
Delta Logo
10:12 am - 7:10 am
STL
-
LHR
14h 58m
2 stops
$752Delta
Mon, Mar 16 - Mon, Mar 30
Finnair Logo
11:15 am - 11:58 pm
LHR
-
STL
17h 43m
1 stop
Finnair Logo
11:22 am - 9:00 am
STL
-
LHR
15h 38m
1 stop
$761Finnair
Mon, Mar 16 - Mon, Mar 30
Delta Logo
8:40 am - 8:42 pm
LHR
-
STL
18h 02m
2 stops
Delta Logo
4:26 pm - 12:05 pm
STL
-
LHR
13h 39m
1 stop
$768Delta
Wed, Apr 29 - Wed, May 20
Virgin Atlantic Logo
7:20 pm - 11:58 pm
LHR
-
STL
33h 38m
2 stops
Virgin Atlantic Logo
6:59 pm - 6:25 am
STL
-
LHR
30h 26m
1 stop
$770Virgin Atlantic
Sun, Mar 15 - Sun, Mar 22
Virgin Atlantic Logo
11:15 am - 5:44 pm
LHR
-
STL
12h 29m
1 stop
Virgin Atlantic Logo
1:02 pm - 6:25 am
STL
-
LHR
11h 23m
1 stop
$773Virgin Atlantic
Thu, Apr 16 - Thu, Apr 30
British Airways Logo
9:50 pm - 7:29 pm
LHR
-
STL
27h 39m
2 stops
British Airways Logo
11:45 am - 8:00 am
STL
-
LHR
14h 15m
1 stop
$788British Airways
Thu, Apr 30 - Thu, May 7
British Airways Logo
3:45 pm - 9:12 pm
LHR
-
STL
35h 27m
2 stops
British Airways Logo
11:09 am - 7:00 pm
STL
-
LHR
26h 51m
1 stop
$789British Airways
Tue, Mar 3 - Sun, Mar 8

British Airways flights from London to St. Louis

Our best British Airways deals on London to St. Louis flight tickets
British Airways
Apr 30
LHR9:50 pmLondon Heathrow
27h 39m
2 stops
STL7:29 pmLambert-St Louis
May 7
STL11:45 amLambert-St Louis
14h 15m
1 stop
LHR8:00 amLondon Heathrow
$788
British Airways
Mar 3
LHR3:45 pmLondon Heathrow
35h 27m
2 stops
STL9:12 pmLambert-St Louis
Mar 8
STL11:09 amLambert-St Louis
26h 51m
1 stop
LHR7:00 pmLondon Heathrow
$789
British Airways
Apr 30
LHR8:50 pmLondon Heathrow
28h 39m
2 stops
STL7:29 pmLambert-St Louis
May 7
STL11:45 amLambert-St Louis
14h 15m
1 stop
LHR8:00 amLondon Heathrow
$790

Scandinavian Airlines flights from London to St. Louis

Our best Scandinavian Airlines deals on London to St. Louis flight tickets
Scandinavian Airlines
Mar 9
LHR7:05 amLondon Heathrow
21h 53m
3 stops
STL11:58 pmLambert-St Louis
Mar 23
STL4:21 pmLambert-St Louis
20h 19m
2 stops
LHR5:40 pmLondon Heathrow
$849
Scandinavian Airlines
Feb 26
LHR6:40 amLondon Heathrow
22h 56m
2 stops
STL11:36 pmLambert-St Louis
Mar 2
STL3:47 pmLambert-St Louis
18h 13m
2 stops
LHR4:00 pmLondon Heathrow
$1,452
Scandinavian Airlines
Feb 26
LHR6:40 amLondon Heathrow
22h 56m
2 stops
STL11:36 pmLambert-St Louis
Mar 2
STL3:47 pmLambert-St Louis
18h 13m
2 stops
LHR4:00 pmLondon Heathrow
$1,455

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 February 14, 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

Mon 3/9

2:00 pm-7:11 pm

2 stops34h 11m

Lambert-St Louis

Mon 3/23

7:47 am-10:00 am

1 stop21h 13m

$616

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 3/9

2:00 pm-11:19 pm

1 stop14h 19m

Lambert-St Louis

Mon 3/23

7:47 am-10:00 am

1 stop21h 13m

$639

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 3/13

2:00 pm-11:19 pm

1 stop14h 19m

Lambert-St Louis

Fri 3/20

12:16 pm-10:05 am

2 stops40h 49m

$641

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/16

11:45 am-11:58 pm

2 stops17h 13m

Lambert-St Louis

Mon 3/30

10:12 am-7:10 am

2 stops14h 58m

$752

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/16

11:15 am-11:58 pm

1 stop17h 43m

Lambert-St Louis

Mon 3/30

11:22 am-9:00 am

1 stop15h 38m

$761

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/29

8:40 am-8:42 pm

2 stops18h 02m

Lambert-St Louis

Wed 5/20

4:26 pm-12:05 pm

1 stop13h 39m

$768

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 3/15

7:20 pm-11:58 pm

2 stops33h 38m

Lambert-St Louis

Sun 3/22

6:59 pm-6:25 am

1 stop30h 26m

$770

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 4/16

11:15 am-5:44 pm

1 stop12h 29m

Lambert-St Louis

Thu 4/30

1:02 pm-6:25 am

1 stop11h 23m

$773

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 4/30

9:50 pm-7:29 pm

2 stops27h 39m

Lambert-St Louis

Thu 5/7

11:45 am-8:00 am

1 stop14h 15m

$788

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 3/3

3:45 pm-9:12 pm

2 stops35h 27m

Lambert-St Louis

Sun 3/8

11:09 am-7:00 pm

1 stop26h 51m

$789

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 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 $695. The month of February is another great option to travel to St. Louis, with average flight prices from London averaging around $873.

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 $982 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 $921 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?

No. A direct flight is the cheapest option for a flight between London to St. Louis.

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

As of February 2026, prices for London to St. Louis flights are approximately 26% 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

$446

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 $446. 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
7,739 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,289 reviews
Search United Airlines flights
American AirlinesPriceFrom $692Free CancellationRating
7.2
11,288 reviews
Search American 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
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
Shrewsbury

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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