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Cheap flights from London to St. Louis from $816

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from London to St. Louis departing on 9/17. 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

Scandinavian Airlines Logo
6:40 am - 10:00 pmLHR-STL
21h 20m2 stops
Scandinavian Airlines Logo
3:40 pm - 5:40 pmSTL-LHR
20h 00m2 stops
$816Scandinavian Airlines
Find Deal
mié., sep. 17 - jue., sep. 25
Logo
2:00 pm - 10:39 pmLGW-STL
14h 39m1 stop
Logo
5:11 pm - 10:00 amSTL-LGW
34h 49m1 stop
$816
Find Deal
jue., nov. 27 - jue., dic. 4
Air Canada Logo
2:05 pm - 7:57 pmLHR-STL
11h 52m1 stop
Air Canada Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
$818Air Canada
Find Deal
mar., sep. 2 - mar., sep. 23
Air Canada Logo
12:05 pm - 7:38 pmLHR-STL
13h 33m1 stop
Air Canada Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
$824Air Canada
Find Deal
jue., sep. 25 - dom., sep. 28
United Airlines Logo
8:00 am - 4:40 pmLHR-STL
14h 40m1 stop
United Airlines Logo
6:00 am - 11:45 amSTL-LHR
23h 45m2 stops
$874United Airlines
Find Deal
sáb., sep. 13 - sáb., sep. 20
United Airlines Logo
9:30 am - 11:44 pmLHR-STL
20h 14m1 stop
United Airlines Logo
6:00 am - 10:10 amSTL-LHR
22h 10m1 stop
$879United Airlines
Find Deal
sáb., sep. 13 - sáb., sep. 20
Lufthansa Logo
3:30 pm - 1:55 pmLHR-STL
28h 25m1 stop
Lufthansa Logo
7:00 am - 6:20 amSTL-LHR
17h 20m1 stop
$930Lufthansa
Find Deal
jue., nov. 27 - jue., dic. 4
Lufthansa Logo
3:30 pm - 1:55 pmLHR-STL
28h 25m1 stop
Lufthansa Logo
6:42 pm - 6:40 amSTL-LHR
29h 58m2 stops
$936Lufthansa
Find Deal
jue., nov. 27 - jue., dic. 4
Virgin Atlantic Logo
8:40 am - 8:35 pmLHR-STL
17h 55m2 stops
Virgin Atlantic Logo
2:18 pm - 8:45 amSTL-LHR
12h 27m1 stop
$938Virgin Atlantic
Find Deal
lun., nov. 24 - lun., dic. 1
Virgin Atlantic Logo
8:40 am - 8:23 pmLCY-STL
17h 43m2 stops
Virgin Atlantic Logo
10:45 am - 7:15 amSTL-LCY
14h 30m2 stops
$1,025Virgin Atlantic
Find Deal
jue., oct. 9 - lun., oct. 13

Scandinavian Airlines flights from London to St. Louis

Our best Scandinavian Airlines deals on London to St. Louis flight tickets
Scandinavian Airlines
Sep 17
LHR6:40 amLondon Heathrow
21h 20m
2 stops
STL10:00 pmLambert-St Louis
Sep 25
STL3:40 pmLambert-St Louis
20h 00m
2 stops
LHR5:40 pmLondon Heathrow
$816
Find similar
Scandinavian Airlines
Oct 16
LHR6:40 amLondon Heathrow
23h 01m
2 stops
STL11:41 pmLambert-St Louis
Oct 21
STL3:59 pmLambert-St Louis
20h 31m
2 stops
LHR6:30 pmLondon Heathrow
$830
Find similar
Scandinavian Airlines
Oct 16
LHR6:40 amLondon Heathrow
23h 01m
3 stops
STL11:41 pmLambert-St Louis
Oct 21
STL1:30 pmLambert-St Louis
22h 10m
2 stops
LHR5:40 pmLondon Heathrow
$837
Find similar

Air Canada flights from London to St. Louis

Our best Air Canada deals on London to St. Louis flight tickets
Air Canada
Sep 2
LHR2:05 pmLondon Heathrow
11h 52m
1 stop
STL7:57 pmLambert-St Louis
Sep 23
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
$818
Find similar
Air Canada
Sep 25
LHR12:05 pmLondon Heathrow
13h 33m
1 stop
STL7:38 pmLambert-St Louis
Sep 28
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
$824
Find similar
Air Canada
Sep 18
LHR12:05 pmLondon Heathrow
13h 33m
1 stop
STL7:38 pmLambert-St Louis
Sep 25
STL1:30 pmLambert-St Louis
14h 05m
1 stop
LHR9:35 amLondon Heathrow
$826
Find similar

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 agosto 21, 2025.
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

mié. 9/17

6:40 am-10:00 pm

2 stops21h 20m

Lambert-St Louis

jue. 9/25

3:40 pm-5:40 pm

2 stops20h 00m

$816

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

jue. 11/27

2:00 pm-10:39 pm

1 stop14h 39m

Lambert-St Louis

jue. 12/4

5:11 pm-10:00 am

1 stop34h 49m

$816

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

mar. 9/2

2:05 pm-7:57 pm

1 stop11h 52m

Lambert-St Louis

mar. 9/23

1:30 pm-6:30 am

1 stop11h 00m

$818

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 9/25

12:05 pm-7:38 pm

1 stop13h 33m

Lambert-St Louis

dom. 9/28

1:30 pm-6:30 am

1 stop11h 00m

$824

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

sáb. 9/13

8:00 am-4:40 pm

1 stop14h 40m

Lambert-St Louis

sáb. 9/20

6:00 am-11:45 am

2 stops23h 45m

$874

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

sáb. 9/13

9:30 am-11:44 pm

1 stop20h 14m

Lambert-St Louis

sáb. 9/20

6:00 am-10:10 am

1 stop22h 10m

$879

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 11/27

3:30 pm-1:55 pm

1 stop28h 25m

Lambert-St Louis

jue. 12/4

7:00 am-6:20 am

1 stop17h 20m

$930

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 11/27

3:30 pm-1:55 pm

1 stop28h 25m

Lambert-St Louis

jue. 12/4

6:42 pm-6:40 am

2 stops29h 58m

$936

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

lun. 11/24

8:40 am-8:35 pm

2 stops17h 55m

Lambert-St Louis

lun. 12/1

2:18 pm-8:45 am

1 stop12h 27m

$938

LondonSt. Louis

LCY - STL

LCYSTL

London City

jue. 10/9

8:40 am-8:23 pm

2 stops17h 43m

Lambert-St Louis

lun. 10/13

10:45 am-7:15 am

2 stops14h 30m

$1,025

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 $740. The month of January is another great option to travel to St. Louis, with average flight prices from London averaging around $753.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $952. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,371. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from London at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,075 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $1,229 per ticket.

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 $966 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 $853 on momondo.

Can stopping save me money on London to St. Louis flights?

You could potentially save up to 15% 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 August 2025, prices for London to St. Louis flights are approximately 26% more expensive 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

Direct flights

None
There are no direct flights from London to St. Louis. There are no popular flight routes from London to St. Louis.
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  • 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 11h 52m.

  • 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 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
7,291 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,344 reviews
Search Lufthansa flights
United AirlinesPriceFrom $952Free CancellationRating
7.4
8,930 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
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Festus
Farmington
Glencoe
Clayton
Edwardsville
Eureka
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.

An easier way to manage your St. Louis trip

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