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Cheap flights from St. Louis to London from $282

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to London departing on 10/20. 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 St. Louis to London (STL-LHR)

Cheap round-trip flights

Logo
9:15 am - 6:35 amSTL-LHR
15h 20m1 stop
Logo
8:15 pm - 3:29 pmLHR-STL
48h 14m2 stops
$524
Find Deal
lun., oct. 20 - lun., oct. 27
Delta Logo
7:05 am - 9:00 amSTL-LHR
19h 55m1 stop
Delta Logo
6:30 am - 5:09 pmLHR-STL
16h 39m2 stops
$525Delta
Find Deal
mar., dic. 9 - mar., dic. 16
Air Canada Logo
1:30 pm - 9:35 amSTL-LHR
14h 05m1 stop
Air Canada Logo
11:05 am - 3:18 pmLHR-STL
34h 13m2 stops
$526Air Canada
Find Deal
lun., oct. 13 - lun., oct. 20
Delta Logo
10:45 am - 8:50 amSTL-LHR
16h 05m2 stops
Delta Logo
6:15 am - 6:02 pmLHR-STL
17h 47m2 stops
$527Delta
Find Deal
mar., oct. 14 - mié., oct. 22
United Airlines Logo
8:20 am - 7:30 amSTL-LHR
17h 10m1 stop
United Airlines Logo
6:00 pm - 3:29 pmLHR-STL
27h 29m1 stop
$528United Airlines
Find Deal
mié., nov. 19 - vie., dic. 5
United Airlines Logo
6:00 am - 10:15 amSTL-LHR
22h 15m1 stop
United Airlines Logo
6:30 am - 1:55 pmLHR-STL
13h 25m1 stop
$529United Airlines
Find Deal
mar., dic. 30 - vie., ene. 9
Air Canada Logo
4:05 pm - 7:10 amSTL-LHR
33h 05m2 stops
Air Canada Logo
6:00 pm - 3:29 pmLHR-STL
27h 29m1 stop
$530Air Canada
Find Deal
dom., dic. 7 - jue., dic. 18
Logo
1:59 pm - 6:35 amSTL-LHR
10h 36m1 stop
Logo
1:10 pm - 8:23 pmLHR-STL
13h 13m1 stop
$531
Find Deal
lun., dic. 29 - vie., ene. 9
Virgin Atlantic Logo
10:45 am - 6:45 amSTL-LHR
14h 00m2 stops
Virgin Atlantic Logo
9:40 am - 11:06 pmLHR-STL
18h 26m2 stops
$536Virgin Atlantic
Find Deal
lun., oct. 20 - jue., oct. 30
Iberia Logo
12:53 pm - 8:35 amSTL-LHR
13h 42m1 stop
Iberia Logo
7:40 pm - 9:57 amLHR-STL
20h 17m2 stops
$561Iberia
Find Deal
jue., ene. 15 - lun., ene. 26

Air Canada flights from St. Louis to London Heathrow Airport

Our best Air Canada deals on St. Louis to London Heathrow Airport flight tickets
Air Canada
Oct 13
STL1:30 pmLambert-St Louis
14h 05m
1 stop
LHR9:35 amLondon Heathrow
Oct 20
LHR11:05 amLondon Heathrow
34h 13m
2 stops
STL3:18 pmLambert-St Louis
$526
Find similar
Air Canada
Dec 7
STL4:05 pmLambert-St Louis
33h 05m
2 stops
LHR7:10 amLondon Heathrow
Dec 18
LHR6:00 pmLondon Heathrow
27h 29m
1 stop
STL3:29 pmLambert-St Louis
$530
Find similar
Air Canada
Oct 11
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
Oct 21
LHR6:50 amLondon Heathrow
14h 28m
2 stops
STL3:18 pmLambert-St Louis
$562
Find similar

United Airlines flights from St. Louis to London Heathrow Airport

Our best United Airlines deals on St. Louis to London Heathrow Airport flight tickets
United Airlines
Nov 19
STL8:20 amLambert-St Louis
17h 10m
1 stop
LHR7:30 amLondon Heathrow
Dec 5
LHR6:00 pmLondon Heathrow
27h 29m
1 stop
STL3:29 pmLambert-St Louis
$528
Find similar
United Airlines
Dec 30
STL6:00 amLambert-St Louis
22h 15m
1 stop
LHR10:15 amLondon Heathrow
Jan 9
LHR6:30 amLondon Heathrow
13h 25m
1 stop
STL1:55 pmLambert-St Louis
$529
Find similar
United Airlines
Jan 11
STL2:45 pmLambert-St Louis
12h 55m
1 stop
LHR9:40 amLondon Heathrow
Jan 21
LHR11:35 amLondon Heathrow
15h 23m
1 stop
STL8:58 pmLambert-St Louis
$532
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to London Heathrow Airport 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 septiembre 4, 2025.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 10/20

9:15 am-6:35 am

1 stop15h 20m

London Heathrow

lun. 10/27

8:15 pm-3:29 pm

2 stops48h 14m

$524

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 12/9

7:05 am-9:00 am

1 stop19h 55m

London Heathrow

mar. 12/16

6:30 am-5:09 pm

2 stops16h 39m

$525

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 10/13

1:30 pm-9:35 am

1 stop14h 05m

London Heathrow

lun. 10/20

11:05 am-3:18 pm

2 stops34h 13m

$526

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 10/14

10:45 am-8:50 am

2 stops16h 05m

London Heathrow

mié. 10/22

6:15 am-6:02 pm

2 stops17h 47m

$527

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 11/19

8:20 am-7:30 am

1 stop17h 10m

London Heathrow

vie. 12/5

6:00 pm-3:29 pm

1 stop27h 29m

$528

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 12/30

6:00 am-10:15 am

1 stop22h 15m

London Heathrow

vie. 1/9

6:30 am-1:55 pm

1 stop13h 25m

$529

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

dom. 12/7

4:05 pm-7:10 am

2 stops33h 05m

London Heathrow

jue. 12/18

6:00 pm-3:29 pm

1 stop27h 29m

$530

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 12/29

1:59 pm-6:35 am

1 stop10h 36m

London Heathrow

vie. 1/9

1:10 pm-8:23 pm

1 stop13h 13m

$531

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 10/20

10:45 am-6:45 am

2 stops14h 00m

London Heathrow

jue. 10/30

9:40 am-11:06 pm

2 stops18h 26m

$536

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 1/15

12:53 pm-8:35 am

1 stop13h 42m

London Heathrow

lun. 1/26

7:40 pm-9:57 am

2 stops20h 17m

$561

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 London from

How to get the cheapest flight ticket from St. Louis to London Heathrow Airport

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 cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from St. Louis, with most prices found around $791. If you’re not able to fly to London Heathrow Airport in October, then August is your next best option. Flight prices from St. Louis to London Heathrow Airport during August average around $797.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Thursday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $906. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $1,015.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from St. Louis to London Heathrow Airport in the evening for as low as $895. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $996.

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $925 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from St. Louis for as low as $811 on momondo.

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

You could potentially save up to 5% on your flight if you consider stops on a St. Louis to London Heathrow Airport flight.

When to book flights from St. Louis to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to London Heathrow Airport

Direct flights

None
There are no direct flights from St. Louis to London Heathrow Airport. There are no popular flight routes from St. Louis to London Heathrow Airport.
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  • How far is Lambert-St Louis to London Heathrow by plane?

    Lambert-St Louis and London Heathrow are 4185.8 mi apart from one another. By plane, this route typically takes 10h 32m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?

    Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to London Heathrow Airport?

Best airlines flying from St. Louis to London Heathrow Airport

Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $530Free CancellationRating
7.8
1,383 reviews
Search KLM flights
DeltaPriceFrom $631Free CancellationRating
7.9
7,977 reviews
Search Delta flights
American AirlinesPriceFrom $638Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
British AirwaysPriceFrom $652Free CancellationRating
6.7
7,345 reviews
Search British Airways flights
United AirlinesPriceFrom $667Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
Scandinavian AirlinesPriceFrom $669Free CancellationRating
7.4
1,482 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $670Free CancellationRating
6.8
7,390 reviews
Search Lufthansa flights
IberiaPriceFrom $671Free CancellationRating
7.0
2,909 reviews
Search Iberia flights
Air CanadaPriceFrom $691Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
Virgin AtlanticPriceFrom $727Free CancellationRating
7.4
663 reviews
Search Virgin Atlantic flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Luton
Dover
Slough
Milton Keynes
Hayes
Guildford
Dartford
Stansted
Crawley
Chelmsford
Brentwood
Salisbury
Ilford
Folkestone
Colchester
Swindon
Stratford-upon-Avon
Watford

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from St. Louis.

Can I find flights from St. Louis to London with flexible booking policies on momondo?

Flights from St. Louis to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to London?

Once all potential St. Louis to London 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 St. Louis to London right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to London from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London Heathrow Airport trip

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