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Cheap flights from St. Louis to London from $253

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 11/9. 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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Cheap round-trip flights

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Multiple Airlines Logo
11:17 am - 6:00 amSTL-LGW
36h 43m2 stops
Multiple Airlines Logo
2:00 pm - 11:57 pmLGW-STL
15h 57m1 stop
$563Multiple Airlines
Find Deal
Sun, Nov 16 - Mon, Nov 24
Multiple Airlines Logo
5:11 pm - 10:00 amSTL-LGW
34h 49m1 stop
Multiple Airlines Logo
2:00 pm - 10:46 pmLGW-STL
14h 46m1 stop
$564Multiple Airlines
Find Deal
Wed, Dec 3 - Fri, Dec 5
United Airlines Logo
12:31 pm - 5:55 amSTL-LHR
12h 24m1 stop
United Airlines Logo
6:50 am - 3:49 pmLHR-STL
14h 59m2 stops
$630United Airlines
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Wed, Oct 29 - Wed, Nov 12
United Airlines Logo
7:00 am - 7:10 amSTL-LHR
18h 10m2 stops
United Airlines Logo
6:30 am - 1:55 pmLHR-STL
13h 25m1 stop
$631United Airlines
Find Deal
Wed, Nov 19 - Fri, Dec 5
British Airways Logo
2:51 pm - 7:00 amSTL-LHR
10h 09m1 stop
British Airways Logo
11:45 am - 6:25 pmLHR-STL
12h 40m1 stop
$653British Airways
Find Deal
Tue, Nov 4 - Tue, Nov 11
British Airways Logo
12:51 pm - 7:40 amSTL-LHR
12h 49m1 stop
British Airways Logo
10:05 am - 8:53 pmLHR-STL
15h 48m1 stop
$654British Airways
Find Deal
Tue, Oct 21 - Wed, Oct 29
Iberia Logo
2:21 pm - 7:00 pmSTL-LGW
23h 39m2 stops
Iberia Logo
7:40 pm - 8:58 amLGW-STL
42h 18m2 stops
$665Iberia
Find Deal
Mon, Mar 16 - Mon, Mar 23
Iberia Logo
11:18 am - 10:50 amSTL-LGW
18h 32m2 stops
Iberia Logo
11:45 am - 8:58 amLGW-STL
26h 13m2 stops
$839Iberia
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Tue, Mar 17 - Fri, Mar 20
American Airlines Logo
5:30 am - 7:30 amSTL-LGW
21h 00m2 stops
American Airlines Logo
2:30 pm - 7:02 pmLGW-STL
34h 32m2 stops
$880American Airlines
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Fri, Mar 27 - Tue, Mar 31
American Airlines Logo
5:30 am - 7:30 amSTL-LGW
21h 00m2 stops
American Airlines Logo
2:30 pm - 12:06 pmLGW-STL
27h 36m2 stops
$881American Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31

Scandinavian Airlines flights from St. Louis to London

Our best Scandinavian Airlines deals on St. Louis to London flight tickets
Scandinavian Airlines
Nov 15
STL11:39 amLambert-St Louis
24h 51m
2 stops
LHR6:30 pmLondon Heathrow
Nov 22
LHR6:40 amLondon Heathrow
21h 18m
2 stops
STL9:58 pmLambert-St Louis
$603
Find similar
Scandinavian Airlines
Oct 25
STL3:59 pmLambert-St Louis
20h 41m
2 stops
LHR6:40 pmLondon Heathrow
Nov 1
LHR6:40 amLondon Heathrow
20h 24m
2 stops
STL10:04 pmLambert-St Louis
$634
Find similar

Delta flights from St. Louis to London

Our best Delta deals on St. Louis to London flight tickets
Delta
Dec 5
STL11:40 amLambert-St Louis
15h 20m
1 stop
LHR9:00 amLondon Heathrow
Dec 7
LHR9:00 amLondon Heathrow
18h 02m
2 stops
STL9:02 pmLambert-St Louis
$626
Find similar
Delta
Oct 14
STL9:10 amLambert-St Louis
16h 05m
1 stop
LHR7:15 amLondon Heathrow
Oct 22
LHR6:30 amLondon Heathrow
16h 13m
2 stops
STL4:43 pmLambert-St Louis
$632
Find similar
Delta
Oct 14
STL1:30 pmLambert-St Louis
13h 25m
2 stops
LHR8:55 amLondon Heathrow
Oct 22
LHR6:30 amLondon Heathrow
16h 59m
2 stops
STL5:29 pmLambert-St Louis
$636
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 October 9, 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 - LGW

STLLGW

Lambert-St Louis

Sun 11/16

11:17 am-6:00 am

2 stops36h 43m

London Gatwick

Mon 11/24

2:00 pm-11:57 pm

1 stop15h 57m

$563

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 12/3

5:11 pm-10:00 am

1 stop34h 49m

London Gatwick

Fri 12/5

2:00 pm-10:46 pm

1 stop14h 46m

$564

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/29

12:31 pm-5:55 am

1 stop12h 24m

London Heathrow

Wed 11/12

6:50 am-3:49 pm

2 stops14h 59m

$630

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 11/19

7:00 am-7:10 am

2 stops18h 10m

London Heathrow

Fri 12/5

6:30 am-1:55 pm

1 stop13h 25m

$631

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 11/4

2:51 pm-7:00 am

1 stop10h 09m

London Heathrow

Tue 11/11

11:45 am-6:25 pm

1 stop12h 40m

$653

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 10/21

12:51 pm-7:40 am

1 stop12h 49m

London Heathrow

Wed 10/29

10:05 am-8:53 pm

1 stop15h 48m

$654

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 3/16

2:21 pm-7:00 pm

2 stops23h 39m

London Gatwick

Mon 3/23

7:40 pm-8:58 am

2 stops42h 18m

$665

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 3/17

11:18 am-10:50 am

2 stops18h 32m

London Gatwick

Fri 3/20

11:45 am-8:58 am

2 stops26h 13m

$839

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Fri 3/27

5:30 am-7:30 am

2 stops21h 00m

London Gatwick

Tue 3/31

2:30 pm-7:02 pm

2 stops34h 32m

$880

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Fri 3/27

5:30 am-7:30 am

2 stops21h 00m

London Gatwick

Tue 3/31

2:30 pm-12:06 pm

2 stops27h 36m

$881

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 typical price of a round-trip flight between St. Louis and London?

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 $726, 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 $750.

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 $908 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 $743 on momondo.

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

You could potentially save up to 11% 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 October 2025, prices for St. Louis to London flights are approximately 36% 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.
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  • 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 10h 05m, 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 $529Free CancellationRating
7.7
1,399 reviews
Search KLM flights
Air CanadaPriceFrom $573Free CancellationRating
7.1
10,263 reviews
Search Air Canada flights
DeltaPriceFrom $580Free CancellationRating
7.9
7,971 reviews
Search Delta flights
United AirlinesPriceFrom $580Free CancellationRating
7.4
8,966 reviews
Search United Airlines flights
British AirwaysPriceFrom $580Free CancellationRating
6.7
7,446 reviews
Search British Airways flights
Scandinavian AirlinesPriceFrom $602Free CancellationRating
7.4
1,530 reviews
Search Scandinavian Airlines flights
American AirlinesPriceFrom $637Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
IberiaPriceFrom $654Free CancellationRating
7.0
2,982 reviews
Search Iberia flights
LufthansaPriceFrom $670Free CancellationRating
6.8
7,463 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom $736Free CancellationRating
7.4
665 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
Milton Keynes
Luton
Dover
Slough
Guildford
Dartford
Hayes
Crawley
Chelmsford
Brentwood
Colchester
Ilford
Folkestone
Romford
Cobham
Stansted
Watford
Richmond

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.

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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