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Cheap flights from St. Louis to London from $264

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 3/1. 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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Find the cheapest flights from St. Louis to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
1:00 pm - 6:25 am
STL
-
LHR
11h 25m1 stop
Delta Logo
12:30 pm - 7:27 pm
LHR
-
STL
12h 57m1 stop
$655Delta
Tue, Jan 20 - Sat, Feb 7
Air Canada Logo
4:05 pm - 8:30 am
STL
-
LHR
10h 25m1 stop
Air Canada Logo
1:25 pm - 3:29 pm
LHR
-
STL
31h 04m2 stops
$656Air Canada
Thu, Mar 5 - Fri, Mar 13
Scandinavian Airlines Logo
1:30 pm - 9:20 am
STL
-
LHR
37h 50m2 stops
Scandinavian Airlines Logo
7:30 pm - 11:38 pm
LHR
-
STL
34h 08m2 stops
$657Scandinavian Airlines
Tue, Apr 14 - Mon, Apr 20
United Airlines Logo
4:05 pm - 8:35 pm
STL
-
LHR
22h 30m2 stops
United Airlines Logo
3:30 pm - 4:03 pm
LHR
-
STL
30h 33m2 stops
$658United Airlines
Sat, Jan 24 - Sat, Jan 31
Delta Logo
6:05 am - 7:05 am
STL
-
LHR
19h 00m1 stop
Delta Logo
9:40 am - 8:06 pm
LHR
-
STL
16h 26m2 stops
$659Delta
Fri, Jan 2 - Tue, Jan 13
Air Canada Logo
4:05 pm - 7:10 am
STL
-
LHR
34h 05m2 stops
Air Canada Logo
1:25 pm - 3:29 pm
LHR
-
STL
31h 04m2 stops
$660Air Canada
Wed, Mar 11 - Thu, Mar 19
Lufthansa Logo
11:22 am - 10:25 am
STL
-
LHR
17h 03m1 stop
Lufthansa Logo
11:10 am - 11:59 pm
LHR
-
STL
18h 49m2 stops
$661Lufthansa
Thu, Jan 15 - Mon, Jan 26
Air Canada Logo
4:05 pm - 11:20 am
STL
-
LHR
13h 15m1 stop
Air Canada Logo
12:00 pm - 3:29 pm
LHR
-
STL
32h 29m2 stops
$662Air Canada
Tue, Mar 3 - Fri, Mar 13
Air Canada Logo
7:41 am - 7:10 am
STL
-
LHR
17h 29m2 stops
Air Canada Logo
6:00 pm - 3:29 pm
LHR
-
STL
26h 29m1 stop
$663Air Canada
Wed, Mar 4 - Thu, Mar 12
Delta Logo
5:30 pm - 1:10 pm
STL
-
LHR
13h 40m1 stop
Delta Logo
6:15 am - 4:45 pm
LHR
-
STL
16h 30m2 stops
$664Delta
Thu, Apr 16 - Thu, Apr 23

Delta flights from St. Louis to London Heathrow Airport

Our best Delta deals on St. Louis to London Heathrow Airport flight tickets
Delta
Jan 20
STL1:00 pmLambert-St Louis
11h 25m
1 stop
LHR6:25 amLondon Heathrow
Feb 7
LHR12:30 pmLondon Heathrow
12h 57m
1 stop
STL7:27 pmLambert-St Louis
$655
Find similar
Delta
Jan 2
STL6:05 amLambert-St Louis
19h 00m
1 stop
LHR7:05 amLondon Heathrow
Jan 13
LHR9:40 amLondon Heathrow
16h 26m
2 stops
STL8:06 pmLambert-St Louis
$659
Find similar
Delta
Apr 16
STL5:30 pmLambert-St Louis
13h 40m
1 stop
LHR1:10 pmLondon Heathrow
Apr 23
LHR6:15 amLondon Heathrow
16h 30m
2 stops
STL4:45 pmLambert-St Louis
$664
Find similar

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
Mar 5
STL4:05 pmLambert-St Louis
10h 25m
1 stop
LHR8:30 amLondon Heathrow
Mar 13
LHR1:25 pmLondon Heathrow
31h 04m
2 stops
STL3:29 pmLambert-St Louis
$656
Find similar
Air Canada
Mar 11
STL4:05 pmLambert-St Louis
34h 05m
2 stops
LHR7:10 amLondon Heathrow
Mar 19
LHR1:25 pmLondon Heathrow
31h 04m
2 stops
STL3:29 pmLambert-St Louis
$660
Find similar
Air Canada
Mar 3
STL4:05 pmLambert-St Louis
13h 15m
1 stop
LHR11:20 amLondon Heathrow
Mar 13
LHR12:00 pmLondon Heathrow
32h 29m
2 stops
STL3:29 pmLambert-St Louis
$662
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 December 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

Tue 1/20

1:00 pm-6:25 am

1 stop11h 25m

London Heathrow

Sat 2/7

12:30 pm-7:27 pm

1 stop12h 57m

$655

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 3/5

4:05 pm-8:30 am

1 stop10h 25m

London Heathrow

Fri 3/13

1:25 pm-3:29 pm

2 stops31h 04m

$656

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/14

1:30 pm-9:20 am

2 stops37h 50m

London Heathrow

Mon 4/20

7:30 pm-11:38 pm

2 stops34h 08m

$657

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 1/24

4:05 pm-8:35 pm

2 stops22h 30m

London Heathrow

Sat 1/31

3:30 pm-4:03 pm

2 stops30h 33m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 1/2

6:05 am-7:05 am

1 stop19h 00m

London Heathrow

Tue 1/13

9:40 am-8:06 pm

2 stops16h 26m

$659

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 3/11

4:05 pm-7:10 am

2 stops34h 05m

London Heathrow

Thu 3/19

1:25 pm-3:29 pm

2 stops31h 04m

$660

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 1/15

11:22 am-10:25 am

1 stop17h 03m

London Heathrow

Mon 1/26

11:10 am-11:59 pm

2 stops18h 49m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 3/3

4:05 pm-11:20 am

1 stop13h 15m

London Heathrow

Fri 3/13

12:00 pm-3:29 pm

2 stops32h 29m

$662

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 3/4

7:41 am-7:10 am

2 stops17h 29m

London Heathrow

Thu 3/12

6:00 pm-3:29 pm

1 stop26h 29m

$663

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 4/16

5:30 pm-1:10 pm

1 stop13h 40m

London Heathrow

Thu 4/23

6:15 am-4:45 pm

2 stops16h 30m

$664

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 $702. If you’re not able to fly to London Heathrow Airport in October, then November is your next best option. Flight prices from St. Louis to London Heathrow Airport during November average around $751.

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

Our data shows that Monday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $668. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $812.

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 $772. 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.

What is the cheapest Lambert-St Louis to London Heathrow flight route?

Fly from Lambert-St Louis to London Heathrow for the best Lambert-St Louis - London Heathrow flight prices

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 $900 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 $799 on momondo.

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

There are 2 cabin classes available to choose from on Lambert-St Louis to London Heathrow 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 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

Best Price Found

$280

Fastest flight time

8h 05m

Direct flights

Mon, Wed, Thu and Sat
The best one-way flight to London Heathrow Airport from St. Louis in the past 72 hours is $280. The best round-trip flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is $690.
The fastest flight from St. Louis to London Heathrow Airport takes 8h 05m
Direct flights go from St. Louis to London Heathrow Airport on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
Search flight deals

  • 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 8h 05m.

  • 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 plane model from St. Louis to London Heathrow Airport?

  • 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 $529Free CancellationRating
7.7
1,430 reviews
Search KLM flights
Air CanadaPriceFrom $573Free CancellationRating
7.1
10,500 reviews
Search Air Canada flights
DeltaPriceFrom $577Free CancellationRating
7.9
8,011 reviews
Search Delta flights
United AirlinesPriceFrom $580Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
British AirwaysPriceFrom $580Free CancellationRating
6.7
7,562 reviews
Search British Airways flights
IberiaPriceFrom $597Free CancellationRating
7.0
3,040 reviews
Search Iberia flights
Scandinavian AirlinesPriceFrom $602Free CancellationRating
7.4
1,592 reviews
Search Scandinavian Airlines flights
Virgin AtlanticPriceFrom $615Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $634Free CancellationRating
7.2
11,046 reviews
Search American Airlines flights
LufthansaPriceFrom $670Free CancellationRating
6.8
7,612 reviews
Search Lufthansa flights

Traveling to a place near London?

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

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

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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