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Cheap flights from London to St. Louis from $340

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 2/9. 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 to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
8:00 am - 2:18 pm
LHR
-
STL
12h 18m
1 stop
United Airlines Logo
11:45 am - 7:15 am
STL
-
LHR
13h 30m
1 stop
$483United Airlines
Fri, May 1 - Tue, May 5
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
$510British Airways
Fri, May 1 - Tue, May 5
Lufthansa Logo
6:30 am - 1:55 pm
LHR
-
STL
13h 25m
1 stop
Lufthansa Logo
1:11 pm - 7:55 am
STL
-
LHR
12h 44m
1 stop
$540Lufthansa
Fri, Jan 30 - Thu, Feb 12
Multiple Airlines Logo
2:00 pm - 12:27 am
LGW
-
STL
16h 27m
1 stop
Multiple Airlines Logo
7:47 am - 10:00 am
STL
-
LGW
20h 13m
1 stop
$584Multiple Airlines
Fri, Feb 27 - Fri, Mar 6
Air Canada Logo
1:25 pm - 10:58 pm
LHR
-
STL
15h 33m
2 stops
Air Canada Logo
4:05 pm - 8:30 am
STL
-
LHR
10h 25m
1 stop
$593Air Canada
Fri, Jan 30 - Thu, Feb 12
United Airlines Logo
9:00 am - 7:27 pm
LHR
-
STL
16h 27m
2 stops
United Airlines Logo
3:15 pm - 11:15 am
STL
-
LHR
14h 00m
1 stop
$597United Airlines
Fri, Feb 6 - Sat, Feb 14
Lufthansa Logo
11:10 am - 10:58 pm
LHR
-
STL
17h 48m
2 stops
Lufthansa Logo
1:11 pm - 5:55 am
STL
-
LHR
10h 44m
1 stop
$601Lufthansa
Mon, Feb 9 - Mon, Mar 2
Multiple Airlines Logo
2:00 pm - 6:51 am
LGW
-
STL
22h 51m
2 stops
Multiple Airlines Logo
7:47 am - 10:00 am
STL
-
LGW
20h 13m
1 stop
$650Multiple Airlines
Fri, Feb 27 - Fri, Mar 6
American Airlines Logo
11:20 am - 11:12 pm
LGW
-
STL
17h 52m
2 stops
American Airlines Logo
9:15 am - 9:00 am
STL
-
LGW
17h 45m
2 stops
$673American Airlines
Tue, Feb 3 - Thu, Feb 12
American Airlines Logo
11:20 am - 8:35 am
LGW
-
STL
27h 15m
2 stops
American Airlines Logo
7:05 am - 7:30 am
STL
-
LGW
18h 25m
2 stops
$738American Airlines
Fri, Feb 27 - Fri, Mar 6

Iberia flights from London to St. Louis

Our best Iberia deals on London to St. Louis flight tickets
Iberia
May 1
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
May 4
STL1:29 pmLambert-St Louis
14h 51m
1 stop
LHR10:20 amLondon Heathrow
$660
Iberia
May 1
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
May 5
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$661
Iberia
Jan 22
LGW7:40 pmLondon Gatwick
31h 35m
2 stops
STL9:15 pmLambert-St Louis
Jan 26
STL11:05 amLambert-St Louis
25h 55m
2 stops
LGW7:00 pmLondon Gatwick
$732

United Airlines flights from London to St. Louis

Our best United Airlines deals on London to St. Louis flight tickets
United Airlines
May 1
LHR8:00 amLondon Heathrow
12h 18m
1 stop
STL2:18 pmLambert-St Louis
May 5
STL11:45 amLambert-St Louis
13h 30m
1 stop
LHR7:15 amLondon Heathrow
$483
United Airlines
Feb 6
LHR9:00 amLondon Heathrow
16h 27m
2 stops
STL7:27 pmLambert-St Louis
Feb 14
STL3:15 pmLambert-St Louis
14h 00m
1 stop
LHR11:15 amLondon Heathrow
$597
United Airlines
Feb 11
LHR8:30 amLondon Heathrow
16h 57m
2 stops
STL7:27 pmLambert-St Louis
Feb 17
STL4:49 pmLambert-St Louis
12h 26m
1 stop
LHR11:15 amLondon Heathrow
$603

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 January 15, 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

LHR - STL

LHRSTL

London Heathrow

Fri 5/1

8:00 am-2:18 pm

1 stop12h 18m

Lambert-St Louis

Tue 5/5

11:45 am-7:15 am

1 stop13h 30m

$483

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 5/1

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Tue 5/5

9:35 pm-11:35 am

Nonstop8h 00m

$510

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/30

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 2/12

1:11 pm-7:55 am

1 stop12h 44m

$540

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 2/27

2:00 pm-12:27 am

1 stop16h 27m

Lambert-St Louis

Fri 3/6

7:47 am-10:00 am

1 stop20h 13m

$584

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/30

1:25 pm-10:58 pm

2 stops15h 33m

Lambert-St Louis

Thu 2/12

4:05 pm-8:30 am

1 stop10h 25m

$593

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 2/6

9:00 am-7:27 pm

2 stops16h 27m

Lambert-St Louis

Sat 2/14

3:15 pm-11:15 am

1 stop14h 00m

$597

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/9

11:10 am-10:58 pm

2 stops17h 48m

Lambert-St Louis

Mon 3/2

1:11 pm-5:55 am

1 stop10h 44m

$601

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 2/27

2:00 pm-6:51 am

2 stops22h 51m

Lambert-St Louis

Fri 3/6

7:47 am-10:00 am

1 stop20h 13m

$650

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 2/3

11:20 am-11:12 pm

2 stops17h 52m

Lambert-St Louis

Thu 2/12

9:15 am-9:00 am

2 stops17h 45m

$673

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 2/27

11:20 am-8:35 am

2 stops27h 15m

Lambert-St Louis

Fri 3/6

7:05 am-7:30 am

2 stops18h 25m

$738

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 $739. The month of January is another great option to travel to St. Louis, with average flight prices from London averaging around $749.

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 $976 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 $819 on momondo.

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

There are 2 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 January 2026, prices for London to St. Louis flights are approximately 3% 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, 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, 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
7,676 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,164 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
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Edwardsville
Festus
Glencoe
Litchfield
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.

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