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Cheap flights from London to St. Louis from $479

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 4/21. 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.
British Airways Logo
9:15 am - 4:13 pmLHR-STL
12h 58m1 stop
British Airways Logo
2:19 pm - 7:05 amSTL-LHR
10h 46m1 stop
$706British Airways
Find Deal
Wed, Apr 22 - Tue, Apr 28
Virgin Atlantic Logo
8:40 am - 9:57 pmLHR-STL
19h 17m2 stops
Virgin Atlantic Logo
10:45 am - 7:40 amSTL-LHR
14h 55m2 stops
$710Virgin Atlantic
Find Deal
Tue, Dec 2 - Tue, Dec 9
Multiple Airlines Logo
12:35 pm - 7:05 pmLHR-STL
12h 30m1 stop
Multiple Airlines Logo
11:41 am - 10:00 amSTL-LHR
16h 19m1 stop
$715Multiple Airlines
Find Deal
Mon, Dec 8 - Tue, Dec 23
American Airlines Logo
12:30 pm - 6:08 pmLGW-STL
35h 38m2 stops
American Airlines Logo
7:35 am - 7:30 amSTL-LGW
18h 55m2 stops
$716American Airlines
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Thu, Mar 5 - Mon, Mar 9
Delta Logo
6:30 am - 5:10 pmLHR-STL
16h 40m2 stops
Delta Logo
10:45 am - 8:05 amSTL-LHR
15h 20m2 stops
$718Delta
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Tue, Dec 2 - Tue, Dec 9
American Airlines Logo
12:30 pm - 6:08 pmLGW-STL
35h 38m2 stops
American Airlines Logo
7:35 am - 7:30 amSTL-LGW
18h 55m2 stops
$719American Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9
Delta Logo
11:45 am - 8:47 pmLHR-STL
15h 02m2 stops
Delta Logo
11:40 am - 8:45 amSTL-LHR
15h 05m2 stops
$719Delta
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Wed, Dec 3 - Wed, Dec 10
Finnair Logo
2:30 pm - 11:24 pmLHR-STL
14h 54m2 stops
Finnair Logo
9:15 am - 6:20 amSTL-LHR
15h 05m2 stops
$720Finnair
Find Deal
Wed, Apr 22 - Tue, Apr 28
Finnair Logo
9:15 am - 5:13 pmLHR-STL
13h 58m1 stop
Finnair Logo
9:15 am - 6:20 amSTL-LHR
15h 05m2 stops
$724Finnair
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Wed, Apr 22 - Tue, Apr 28
Multiple Airlines Logo
2:45 pm - 11:12 pmLHR-STL
14h 27m1 stop
Multiple Airlines Logo
10:00 am - 12:20 pmSTL-LHR
20h 20m1 stop
$730Multiple Airlines
Find Deal
Wed, Jan 7 - Wed, Jan 14

Virgin Atlantic flights from London to St. Louis

Our best Virgin Atlantic deals on London to St. Louis flight tickets
Virgin Atlantic
Dec 2
LHR8:40 amLondon Heathrow
19h 17m
2 stops
STL9:57 pmLambert-St Louis
Dec 9
STL10:45 amLambert-St Louis
14h 55m
2 stops
LHR7:40 amLondon Heathrow
$710
Find similar
Virgin Atlantic
Dec 5
LHR6:30 amLondon Heathrow
15h 36m
2 stops
STL4:06 pmLambert-St Louis
Dec 11
STL9:00 amLambert-St Louis
16h 05m
1 stop
LHR7:05 amLondon Heathrow
$729
Find similar
Virgin Atlantic
Dec 2
LCY9:20 amLondon City
18h 37m
2 stops
STL9:57 pmLambert-St Louis
Dec 9
STL2:38 pmLambert-St Louis
19h 57m
2 stops
LCY4:35 pmLondon City
$734
Find similar

Delta flights from London to St. Louis

Our best Delta deals on London to St. Louis flight tickets
Delta
Dec 2
LHR6:30 amLondon Heathrow
16h 40m
2 stops
STL5:10 pmLambert-St Louis
Dec 9
STL10:45 amLambert-St Louis
15h 20m
2 stops
LHR8:05 amLondon Heathrow
$718
Find similar
Delta
Dec 3
LHR11:45 amLondon Heathrow
15h 02m
2 stops
STL8:47 pmLambert-St Louis
Dec 10
STL11:40 amLambert-St Louis
15h 05m
2 stops
LHR8:45 amLondon Heathrow
$719
Find similar
Delta
Jan 21
LHR6:30 amLondon Heathrow
16h 17m
2 stops
STL4:47 pmLambert-St Louis
Feb 18
STL10:13 amLambert-St Louis
16h 32m
2 stops
LHR8:45 amLondon Heathrow
$727
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 November 5, 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

Wed 4/22

9:15 am-4:13 pm

1 stop12h 58m

Lambert-St Louis

Tue 4/28

2:19 pm-7:05 am

1 stop10h 46m

$706

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/2

8:40 am-9:57 pm

2 stops19h 17m

Lambert-St Louis

Tue 12/9

10:45 am-7:40 am

2 stops14h 55m

$710

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 12/8

12:35 pm-7:05 pm

1 stop12h 30m

Lambert-St Louis

Tue 12/23

11:41 am-10:00 am

1 stop16h 19m

$715

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 3/5

12:30 pm-6:08 pm

2 stops35h 38m

Lambert-St Louis

Mon 3/9

7:35 am-7:30 am

2 stops18h 55m

$716

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/2

6:30 am-5:10 pm

2 stops16h 40m

Lambert-St Louis

Tue 12/9

10:45 am-8:05 am

2 stops15h 20m

$718

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 3/5

12:30 pm-6:08 pm

2 stops35h 38m

Lambert-St Louis

Mon 3/9

7:35 am-7:30 am

2 stops18h 55m

$719

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 12/3

11:45 am-8:47 pm

2 stops15h 02m

Lambert-St Louis

Wed 12/10

11:40 am-8:45 am

2 stops15h 05m

$719

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/22

2:30 pm-11:24 pm

2 stops14h 54m

Lambert-St Louis

Tue 4/28

9:15 am-6:20 am

2 stops15h 05m

$720

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/22

9:15 am-5:13 pm

1 stop13h 58m

Lambert-St Louis

Tue 4/28

9:15 am-6:20 am

2 stops15h 05m

$724

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 1/7

2:45 pm-11:12 pm

1 stop14h 27m

Lambert-St Louis

Wed 1/14

10:00 am-12:20 pm

1 stop20h 20m

$730

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.

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 $875 on momondo.

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

There is only 1 cabin class 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 November 2025, prices for London to St. Louis flights are approximately 38% 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

Fastest flight time

9h 05m

Direct flights

Wed and Thu

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 Wednesday and Thursday. There are no airlines offering direct flights.
There is 1 airport near St. Louis: 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 12h 30m.

  • 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
7,495 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,553 reviews
Search Lufthansa 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
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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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