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Cheap flights from London to St. Louis from $302

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 2/5. 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.
Multiple Airlines Logo
6:30 am - 1:55 pm
LHR
-
STL
13h 25m1 stop
Multiple Airlines Logo
4:05 pm - 6:30 am
STL
-
LHR
32h 25m1 stop
$585Multiple Airlines
Fri, Jan 23 - Thu, Feb 5
Multiple Airlines Logo
12:05 pm - 3:29 pm
LHR
-
STL
57h 24m2 stops
Multiple Airlines Logo
1:11 pm - 5:55 am
STL
-
LHR
10h 44m1 stop
$592Multiple Airlines
Thu, Feb 5 - Thu, Feb 12
United Airlines Logo
6:30 am - 1:55 pm
LHR
-
STL
13h 25m1 stop
United Airlines Logo
1:15 pm - 5:55 am
STL
-
LHR
10h 40m1 stop
$597United Airlines
Fri, Jan 23 - Thu, Feb 5
United Airlines Logo
9:00 am - 7:14 pm
LHR
-
STL
16h 14m2 stops
United Airlines Logo
12:15 pm - 6:40 am
STL
-
LHR
12h 25m1 stop
$598United Airlines
Fri, Feb 20 - Tue, Feb 24
Lufthansa Logo
11:10 am - 10:58 pm
LHR
-
STL
17h 48m2 stops
Lufthansa Logo
6:40 pm - 11:15 am
STL
-
LHR
10h 35m1 stop
$601Lufthansa
Thu, Jan 22 - Mon, Jan 26
Multiple Airlines Logo
11:10 am - 10:58 pm
LHR
-
STL
17h 48m2 stops
Multiple Airlines Logo
11:39 am - 8:35 pm
STL
-
LHR
26h 56m1 stop
$602Multiple Airlines
Tue, Feb 3 - Thu, Feb 12
British Airways Logo
11:45 am - 6:34 pm
LHR
-
STL
12h 49m1 stop
British Airways Logo
1:35 pm - 8:15 am
STL
-
LHR
12h 40m1 stop
$603British Airways
Mon, Jan 19 - Mon, Feb 2
American Airlines Logo
11:20 am - 11:12 pm
LGW
-
STL
17h 52m2 stops
American Airlines Logo
9:36 am - 9:00 am
STL
-
LGW
17h 24m2 stops
$637American Airlines
Tue, Feb 3 - Thu, Feb 12
American Airlines Logo
11:20 am - 8:35 am
LGW
-
STL
27h 15m2 stops
American Airlines Logo
8:00 am - 7:30 am
STL
-
LGW
17h 30m2 stops
$692American Airlines
Fri, Feb 20 - Fri, Feb 27
British Airways Logo
7:15 am - 10:44 pm
LCY
-
STL
21h 29m2 stops
British Airways Logo
9:33 am - 2:35 pm
STL
-
LCY
23h 02m2 stops
$708British Airways
Mon, Jan 19 - Mon, Feb 2

American Airlines flights from London to St. Louis

Our best American Airlines deals on London to St. Louis flight tickets
American Airlines
Feb 3
LGW11:20 amLondon Gatwick
17h 52m
2 stops
STL11:12 pmLambert-St Louis
Feb 12
STL9:36 amLambert-St Louis
17h 24m
2 stops
LGW9:00 amLondon Gatwick
$637
American Airlines
May 5
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
May 11
STL3:43 pmLambert-St Louis
13h 07m
1 stop
LHR10:50 amLondon Heathrow
$648
American Airlines
May 3
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
May 11
STL7:40 pmLambert-St Louis
10h 35m
1 stop
LHR12:15 pmLondon Heathrow
$689

Delta flights from London to St. Louis

Our best Delta deals on London to St. Louis flight tickets
Delta
Jan 19
LHR10:00 amLondon Heathrow
16h 43m
2 stops
STL8:43 pmLambert-St Louis
Feb 2
STL3:45 pmLambert-St Louis
13h 55m
1 stop
LHR11:40 amLondon Heathrow
$641
Delta
Jan 19
LHR10:00 amLondon Heathrow
16h 43m
2 stops
STL8:43 pmLambert-St Louis
Feb 2
STL12:00 pmLambert-St Louis
14h 45m
2 stops
LHR8:45 amLondon Heathrow
$643
Delta
May 5
LHR6:30 amLondon Heathrow
14h 08m
2 stops
STL2:38 pmLambert-St Louis
May 10
STL5:00 pmLambert-St Louis
15h 35m
1 stop
LHR2:35 pmLondon Heathrow
$658

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 8, 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 1/23

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 2/5

4:05 pm-6:30 am

1 stop32h 25m

$585

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/5

12:05 pm-3:29 pm

2 stops57h 24m

Lambert-St Louis

Thu 2/12

1:11 pm-5:55 am

1 stop10h 44m

$592

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/23

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 2/5

1:15 pm-5:55 am

1 stop10h 40m

$597

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 2/20

9:00 am-7:14 pm

2 stops16h 14m

Lambert-St Louis

Tue 2/24

12:15 pm-6:40 am

1 stop12h 25m

$598

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/22

11:10 am-10:58 pm

2 stops17h 48m

Lambert-St Louis

Mon 1/26

6:40 pm-11:15 am

1 stop10h 35m

$601

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/3

11:10 am-10:58 pm

2 stops17h 48m

Lambert-St Louis

Thu 2/12

11:39 am-8:35 pm

1 stop26h 56m

$602

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 1/19

11:45 am-6:34 pm

1 stop12h 49m

Lambert-St Louis

Mon 2/2

1:35 pm-8:15 am

1 stop12h 40m

$603

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

9:36 am-9:00 am

2 stops17h 24m

$637

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 2/20

11:20 am-8:35 am

2 stops27h 15m

Lambert-St Louis

Fri 2/27

8:00 am-7:30 am

2 stops17h 30m

$692

LondonSt. Louis

LCY - STL

LCYSTL

London City

Mon 1/19

7:15 am-10:44 pm

2 stops21h 29m

Lambert-St Louis

Mon 2/2

9:33 am-2:35 pm

2 stops23h 02m

$708

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 $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 $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, 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
7,657 reviews
Search British Airways 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
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
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.

An easier way to manage your St. Louis trip

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