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Cheap flights from London to St. Louis from $417

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 11/27. 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.
KLM Logo
6:30 am - 4:06 pmLHR-STL
15h 36m2 stops
KLM Logo
2:38 pm - 8:45 amSTL-LHR
12h 07m1 stop
$699KLM
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Mon, Dec 8 - Mon, Dec 15
Finnair Logo
11:55 am - 7:29 pmLHR-STL
13h 34m1 stop
Finnair Logo
6:00 am - 7:50 amSTL-LHR
19h 50m1 stop
$701Finnair
Find Deal
Tue, Dec 9 - Tue, Dec 16
Finnair Logo
3:35 pm - 9:03 amLHR-STL
23h 28m2 stops
Finnair Logo
11:34 am - 6:20 amSTL-LHR
12h 46m2 stops
$709Finnair
Find Deal
Tue, Jan 27 - Tue, Feb 17
Multiple Airlines Logo
2:00 pm - 10:33 pmLGW-STL
14h 33m1 stop
Multiple Airlines Logo
3:30 pm - 10:00 amSTL-LGW
12h 30m1 stop
$714Multiple Airlines
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Thu, Dec 11 - Fri, Dec 12
British Airways Logo
9:15 am - 5:13 pmLHR-STL
13h 58m1 stop
British Airways Logo
6:29 pm - 12:15 pmSTL-LHR
11h 46m1 stop
$715British Airways
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Wed, Apr 22 - Wed, May 6
British Airways Logo
11:00 am - 7:03 pmLHR-STL
14h 03m1 stop
British Airways Logo
2:19 pm - 7:50 amSTL-LHR
11h 31m1 stop
$717British Airways
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Wed, Apr 22 - Wed, May 6
Virgin Atlantic Logo
6:30 am - 4:06 pmLHR-STL
15h 36m2 stops
Virgin Atlantic Logo
10:45 am - 6:50 amSTL-LHR
14h 05m2 stops
$720Virgin Atlantic
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Mon, Dec 8 - Mon, Dec 15
American Airlines Logo
12:30 pm - 7:30 pmLGW-STL
37h 00m2 stops
American Airlines Logo
7:35 am - 7:30 amSTL-LGW
18h 55m2 stops
$720American Airlines
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Thu, Mar 5 - Mon, Mar 9
American Airlines Logo
12:30 pm - 6:08 pmLGW-STL
35h 38m2 stops
American Airlines Logo
7:05 pm - 9:00 amSTL-LGW
56h 55m2 stops
$721American Airlines
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Thu, Mar 5 - Mon, Mar 9
Multiple Airlines Logo
2:00 pm - 10:33 pmLGW-STL
14h 33m1 stop
Multiple Airlines Logo
10:42 am - 10:00 amSTL-LGW
17h 18m2 stops
$773Multiple Airlines
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Thu, Dec 11 - Fri, Dec 12

Finnair flights from London to St. Louis

Our best Finnair deals on London to St. Louis flight tickets
Finnair
Dec 9
LHR11:55 amLondon Heathrow
13h 34m
1 stop
STL7:29 pmLambert-St Louis
Dec 16
STL6:00 amLambert-St Louis
19h 50m
1 stop
LHR7:50 amLondon Heathrow
$701
Find similar
Finnair
Jan 27
LHR3:35 pmLondon Heathrow
23h 28m
2 stops
STL9:03 amLambert-St Louis
Feb 17
STL11:34 amLambert-St Louis
12h 46m
2 stops
LHR6:20 amLondon Heathrow
$709
Find similar
Finnair
Apr 22
LHR11:00 amLondon Heathrow
18h 24m
2 stops
STL11:24 pmLambert-St Louis
May 6
STL2:34 pmLambert-St Louis
15h 56m
1 stop
LHR12:30 pmLondon Heathrow
$725
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Delta flights from London to St. Louis

Our best Delta deals on London to St. Louis flight tickets
Delta
Dec 10
LHR6:30 amLondon Heathrow
20h 17m
2 stops
STL8:47 pmLambert-St Louis
Dec 17
STL2:02 pmLambert-St Louis
10h 23m
1 stop
LHR6:25 amLondon Heathrow
$719
Find similar
Delta
Dec 9
LHR6:30 amLondon Heathrow
18h 03m
2 stops
STL6:33 pmLambert-St Louis
Dec 16
STL10:45 amLambert-St Louis
13h 40m
2 stops
LHR6:25 amLondon Heathrow
$722
Find similar
Delta
Dec 8
LHR6:30 amLondon Heathrow
16h 19m
2 stops
STL4:49 pmLambert-St Louis
Dec 15
STL2:38 pmLambert-St Louis
15h 02m
2 stops
LHR11:40 amLondon Heathrow
$723
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 12, 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

Mon 12/8

6:30 am-4:06 pm

2 stops15h 36m

Lambert-St Louis

Mon 12/15

2:38 pm-8:45 am

1 stop12h 07m

$699

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/9

11:55 am-7:29 pm

1 stop13h 34m

Lambert-St Louis

Tue 12/16

6:00 am-7:50 am

1 stop19h 50m

$701

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/27

3:35 pm-9:03 am

2 stops23h 28m

Lambert-St Louis

Tue 2/17

11:34 am-6:20 am

2 stops12h 46m

$709

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 12/11

2:00 pm-10:33 pm

1 stop14h 33m

Lambert-St Louis

Fri 12/12

3:30 pm-10:00 am

1 stop12h 30m

$714

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/22

9:15 am-5:13 pm

1 stop13h 58m

Lambert-St Louis

Wed 5/6

6:29 pm-12:15 pm

1 stop11h 46m

$715

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/22

11:00 am-7:03 pm

1 stop14h 03m

Lambert-St Louis

Wed 5/6

2:19 pm-7:50 am

1 stop11h 31m

$717

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 12/8

6:30 am-4:06 pm

2 stops15h 36m

Lambert-St Louis

Mon 12/15

10:45 am-6:50 am

2 stops14h 05m

$720

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 3/5

12:30 pm-7:30 pm

2 stops37h 00m

Lambert-St Louis

Mon 3/9

7:35 am-7:30 am

2 stops18h 55m

$720

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

7:05 pm-9:00 am

2 stops56h 55m

$721

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 12/11

2:00 pm-10:33 pm

1 stop14h 33m

Lambert-St Louis

Fri 12/12

10:42 am-10:00 am

2 stops17h 18m

$773

Flights are sorted by cheapest round-trip flights 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 $756.

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 $983 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 $897 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 41% 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, 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 Wednesday, Thursday and Saturday. 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 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
7,513 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,565 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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