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Cheap flights from St. Louis to London from $285

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 9/23. 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

Delta Logo
10:45 am - 8:50 amSTL-LHR
16h 05m2 stops
Delta Logo
11:30 am - 11:09 pmLHR-STL
17h 39m2 stops
$527Delta
Find Deal
Tue, Sep 9 - Tue, Sep 23
Delta Logo
10:20 am - 8:55 amSTL-LHR
16h 35m2 stops
Delta Logo
11:45 am - 11:09 pmLHR-STL
17h 24m2 stops
$528Delta
Find Deal
Tue, Sep 9 - Wed, Sep 17
Iberia Logo
5:09 pm - 10:50 amSTL-LHR
11h 41m1 stop
Iberia Logo
12:00 pm - 8:53 pmLHR-STL
14h 53m1 stop
$529Iberia
Find Deal
Tue, Oct 14 - Wed, Oct 22
Virgin Atlantic Logo
2:15 pm - 10:30 amSTL-LHR
14h 15m2 stops
Virgin Atlantic Logo
9:40 am - 8:23 pmLHR-STL
16h 43m2 stops
$535Virgin Atlantic
Find Deal
Wed, Oct 8 - Wed, Oct 15
Virgin Atlantic Logo
5:11 pm - 11:10 amSTL-LHR
11h 59m1 stop
Virgin Atlantic Logo
11:20 am - 9:15 pmLHR-STL
15h 55m1 stop
$542Virgin Atlantic
Find Deal
Sun, Sep 21 - Sun, Sep 28
Iberia Logo
12:23 pm - 6:25 amSTL-LHR
12h 02m1 stop
Iberia Logo
10:50 am - 9:04 amLHR-STL
28h 14m2 stops
$560Iberia
Find Deal
Thu, Oct 16 - Tue, Oct 21
British Airways Logo
4:44 pm - 10:25 amSTL-LHR
11h 41m1 stop
British Airways Logo
7:05 pm - 4:06 pmLHR-STL
27h 01m2 stops
$569British Airways
Find Deal
Thu, Feb 19 - Wed, Feb 25
American Airlines Logo
2:54 pm - 9:15 amSTL-LHR
12h 21m1 stop
American Airlines Logo
2:45 pm - 11:32 pmLHR-STL
14h 47m1 stop
$584American Airlines
Find Deal
Fri, Dec 12 - Fri, Jan 16
British Airways Logo
12:47 pm - 7:40 amSTL-LHR
12h 53m1 stop
British Airways Logo
3:10 pm - 10:50 pmLHR-STL
13h 40m1 stop
$629British Airways
Find Deal
Thu, Sep 25 - Mon, Sep 29
American Airlines Logo
8:23 am - 8:10 amSTL-LGW
17h 47m2 stops
American Airlines Logo
12:20 pm - 11:59 pmLGW-STL
17h 39m2 stops
$728American Airlines
Find Deal
Thu, Sep 4 - Thu, Sep 18

British Airways flights from St. Louis to London

Our best British Airways deals on St. Louis to London flight tickets
British Airways
Feb 19
STL4:44 pmLambert-St Louis
11h 41m
1 stop
LHR10:25 amLondon Heathrow
Feb 25
LHR7:05 pmLondon Heathrow
27h 01m
2 stops
STL4:06 pmLambert-St Louis
$569
Find similar
British Airways
Sep 4
STL12:28 pmLambert-St Louis
14h 32m
1 stop
LHR9:00 amLondon Heathrow
Sep 16
LHR10:30 amLondon Heathrow
13h 52m
1 stop
STL6:22 pmLambert-St Louis
$579
Find similar
British Airways
Sep 25
STL12:47 pmLambert-St Louis
12h 53m
1 stop
LHR7:40 amLondon Heathrow
Sep 29
LHR3:10 pmLondon Heathrow
13h 40m
1 stop
STL10:50 pmLambert-St Louis
$629
Find similar

Delta flights from St. Louis to London

Our best Delta deals on St. Louis to London flight tickets
Delta
Sep 9
STL10:45 amLambert-St Louis
16h 05m
2 stops
LHR8:50 amLondon Heathrow
Sep 23
LHR11:30 amLondon Heathrow
17h 39m
2 stops
STL11:09 pmLambert-St Louis
$527
Find similar
Delta
Sep 9
STL10:20 amLambert-St Louis
16h 35m
2 stops
LHR8:55 amLondon Heathrow
Sep 17
LHR11:45 amLondon Heathrow
17h 24m
2 stops
STL11:09 pmLambert-St Louis
$528
Find similar
Delta
Sep 7
STL1:26 pmLambert-St Louis
11h 49m
1 stop
LHR7:15 amLondon Heathrow
Sep 17
LHR3:15 pmLondon Heathrow
12h 45m
1 stop
STL10:00 pmLambert-St Louis
$530
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to London 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 August 25, 2025.
Use the filters below to find and compare flights from St. Louis to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

10:45 am-8:50 am

2 stops16h 05m

London Heathrow

Tue 9/23

11:30 am-11:09 pm

2 stops17h 39m

$527

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

10:20 am-8:55 am

2 stops16h 35m

London Heathrow

Wed 9/17

11:45 am-11:09 pm

2 stops17h 24m

$528

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 10/14

5:09 pm-10:50 am

1 stop11h 41m

London Heathrow

Wed 10/22

12:00 pm-8:53 pm

1 stop14h 53m

$529

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/8

2:15 pm-10:30 am

2 stops14h 15m

London Heathrow

Wed 10/15

9:40 am-8:23 pm

2 stops16h 43m

$535

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 9/21

5:11 pm-11:10 am

1 stop11h 59m

London Heathrow

Sun 9/28

11:20 am-9:15 pm

1 stop15h 55m

$542

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 10/16

12:23 pm-6:25 am

1 stop12h 02m

London Heathrow

Tue 10/21

10:50 am-9:04 am

2 stops28h 14m

$560

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 2/19

4:44 pm-10:25 am

1 stop11h 41m

London Heathrow

Wed 2/25

7:05 pm-4:06 pm

2 stops27h 01m

$569

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 12/12

2:54 pm-9:15 am

1 stop12h 21m

London Heathrow

Fri 1/16

2:45 pm-11:32 pm

1 stop14h 47m

$584

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 9/25

12:47 pm-7:40 am

1 stop12h 53m

London Heathrow

Mon 9/29

3:10 pm-10:50 pm

1 stop13h 40m

$629

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 9/4

8:23 am-8:10 am

2 stops17h 47m

London Gatwick

Thu 9/18

12:20 pm-11:59 pm

2 stops17h 39m

$728

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

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?

The cheapest month to fly to London from St. Louis is in October. Flight prices, which tend to average around $751, are often lower during this time because this is during the off-season. The month of April is another great option to travel to London, with average flight prices from St. Louis averaging around $758.

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

The cheapest day to depart from St. Louis to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $846. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around $1,006. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from St. Louis in the morning is the least expensive time of day to depart. momondo users have found prices as low as $915 when looking at flights departing in the morning. Flights to London are more costly at noon, with an average ticket price of $958. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to London from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $927 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from St. Louis for as low as $813 on momondo.

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

You could potentially save up to 7% on your flight if you consider stops on a St. Louis to London flight.

How have St. Louis to London flight prices changed over time?

As of August 2025, prices for St. Louis to London flights are approximately 3% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to London

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

Cheap St. Louis to London (STL to LON) flight deals and tips

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

Direct flights

None
There are no direct flights from St. Louis to London. There are no popular flight routes from St. Louis to London.
Search flight deals

  • How far is Lambert-St Louis to London by plane?

    London is 4197.7 mi away from Lambert-St Louis. Flights usually cover this in 11h 15m, depending on flying conditions and air traffic around both airports.

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

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

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

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

    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.

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

    The travel and health documents you'll need for your trip to London 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 London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from St. Louis to London

Compare and see reviews for airlines that fly from St. Louis to London with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $530Free CancellationRating
7.8
1,388 reviews
Search KLM flights
DeltaPriceFrom $631Free CancellationRating
7.9
7,981 reviews
Search Delta flights
British AirwaysPriceFrom $657Free CancellationRating
6.7
7,305 reviews
Search British Airways flights
American AirlinesPriceFrom $662Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
LufthansaPriceFrom $668Free CancellationRating
6.8
7,359 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom $669Free CancellationRating
7.4
1,473 reviews
Search Scandinavian Airlines flights
IberiaPriceFrom $672Free CancellationRating
7.0
2,889 reviews
Search Iberia flights
United AirlinesPriceFrom $686Free CancellationRating
7.4
8,940 reviews
Search United Airlines flights
Air CanadaPriceFrom $691Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
Virgin AtlanticPriceFrom $727Free CancellationRating
7.4
658 reviews
Search Virgin Atlantic flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Luton
Dover
Slough
Milton Keynes
Guildford
Dartford
Crawley
Stansted
Hayes
Chelmsford
Brentwood
Ilford
Folkestone
Colchester
Watford
Canterbury
Richmond
Wembley

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to London for you.

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

momondo does allow users to show only those flights to London from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for St. Louis to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to London right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

An easier way to manage your London trip

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport