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Cheap flights from St. Louis to London from $319

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 5/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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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.
United Airlines Logo
3:11 pm - 7:55 am
STL
-
LHR
10h 44m1 stop
United Airlines Logo
6:30 am - 1:30 pm
LHR
-
STL
13h 00m1 stop
$655United Airlines
Sun, Jan 18 - Wed, Apr 1
British Airways Logo
7:03 pm - 12:30 pm
STL
-
LHR
11h 27m1 stop
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
$657British Airways
Sun, Apr 26 - Wed, May 6
Multiple Airlines Logo
4:05 pm - 8:35 pm
STL
-
LHR
22h 30m2 stops
Multiple Airlines Logo
6:30 am - 1:30 pm
LHR
-
STL
13h 00m1 stop
$658Multiple Airlines
Sun, Jan 18 - Wed, Apr 1
Multiple Airlines Logo
9:30 am - 10:00 am
STL
-
LHR
18h 30m2 stops
Multiple Airlines Logo
6:30 am - 1:30 pm
LHR
-
STL
13h 00m1 stop
$659Multiple Airlines
Sun, May 10 - Fri, May 22
Delta Logo
1:30 pm - 11:10 am
STL
-
LHR
15h 40m1 stop
Delta Logo
6:15 am - 4:49 pm
LHR
-
STL
16h 34m2 stops
$660Delta
Wed, Apr 29 - Tue, May 5
British Airways Logo
10:00 pm - 12:05 pm
STL
-
LHR
8h 05mnonstop
British Airways Logo
2:25 pm - 8:02 pm
LHR
-
STL
11h 37m1 stop
$662British Airways
Sun, May 10 - Fri, May 22
Air Canada Logo
4:05 pm - 6:30 am
STL
-
LHR
32h 25m1 stop
Air Canada Logo
6:00 pm - 3:29 pm
LHR
-
STL
27h 29m1 stop
$664Air Canada
Sun, Jan 4 - Thu, Jan 15
American Airlines Logo
9:15 am - 7:30 am
STL
-
LGW
17h 15m2 stops
American Airlines Logo
11:20 am - 8:35 am
LGW
-
STL
26h 15m2 stops
$725American Airlines
Wed, Mar 11 - Fri, Mar 20
Iberia Logo
3:20 pm - 7:00 pm
STL
-
LGW
21h 40m2 stops
Iberia Logo
7:40 pm - 9:15 pm
LGW
-
STL
31h 35m2 stops
$863Iberia
Tue, Jan 27 - Wed, Feb 4
Iberia Logo
2:54 pm - 10:50 am
STL
-
LGW
37h 56m2 stops
Iberia Logo
11:45 am - 9:15 pm
LGW
-
STL
39h 30m2 stops
$871Iberia
Wed, Jan 28 - Wed, Feb 4

Delta flights from St. Louis to London

Our best Delta deals on St. Louis to London flight tickets
Delta
Jan 18
STL9:59 amLambert-St Louis
14h 56m
2 stops
LHR6:55 amLondon Heathrow
Apr 1
LHR11:45 amLondon Heathrow
17h 57m
2 stops
STL11:42 pmLambert-St Louis
$658
Find similar
Delta
Apr 29
STL1:30 pmLambert-St Louis
15h 40m
1 stop
LHR11:10 amLondon Heathrow
May 5
LHR6:15 amLondon Heathrow
16h 34m
2 stops
STL4:49 pmLambert-St Louis
$660
Find similar
Delta
Apr 8
STL1:35 pmLambert-St Louis
14h 40m
2 stops
LHR10:15 amLondon Heathrow
Apr 16
LHR11:30 amLondon Heathrow
18h 08m
2 stops
STL11:38 pmLambert-St Louis
$665
Find similar

United Airlines flights from St. Louis to London

Our best United Airlines deals on St. Louis to London flight tickets
United Airlines
Jan 18
STL3:11 pmLambert-St Louis
10h 44m
1 stop
LHR7:55 amLondon Heathrow
Apr 1
LHR6:30 amLondon Heathrow
13h 00m
1 stop
STL1:30 pmLambert-St Louis
$655
Find similar
United Airlines
Jan 27
STL5:59 pmLambert-St Louis
11h 06m
1 stop
LHR11:05 amLondon Heathrow
Feb 3
LHR4:00 pmLondon Heathrow
13h 59m
1 stop
STL11:59 pmLambert-St Louis
$666
Find similar
United Airlines
Jan 18
STL9:57 amLambert-St Louis
15h 13m
2 stops
LHR7:10 amLondon Heathrow
Apr 1
LHR1:30 pmLondon Heathrow
15h 29m
2 stops
STL10:59 pmLambert-St Louis
$668
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 December 15, 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

Sun 1/18

3:11 pm-7:55 am

1 stop10h 44m

London Heathrow

Wed 4/1

6:30 am-1:30 pm

1 stop13h 00m

$655

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 4/26

7:03 pm-12:30 pm

1 stop11h 27m

London Heathrow

Wed 5/6

4:25 pm-7:30 pm

Nonstop9h 05m

$657

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 1/18

4:05 pm-8:35 pm

2 stops22h 30m

London Heathrow

Wed 4/1

6:30 am-1:30 pm

1 stop13h 00m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 5/10

9:30 am-10:00 am

2 stops18h 30m

London Heathrow

Fri 5/22

6:30 am-1:30 pm

1 stop13h 00m

$659

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 4/29

1:30 pm-11:10 am

1 stop15h 40m

London Heathrow

Tue 5/5

6:15 am-4:49 pm

2 stops16h 34m

$660

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 5/10

10:00 pm-12:05 pm

Nonstop8h 05m

London Heathrow

Fri 5/22

2:25 pm-8:02 pm

1 stop11h 37m

$662

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 1/4

4:05 pm-6:30 am

1 stop32h 25m

London Heathrow

Thu 1/15

6:00 pm-3:29 pm

1 stop27h 29m

$664

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 3/11

9:15 am-7:30 am

2 stops17h 15m

London Gatwick

Fri 3/20

11:20 am-8:35 am

2 stops26h 15m

$725

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Tue 1/27

3:20 pm-7:00 pm

2 stops21h 40m

London Gatwick

Wed 2/4

7:40 pm-9:15 pm

2 stops31h 35m

$863

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 1/28

2:54 pm-10:50 am

2 stops37h 56m

London Gatwick

Wed 2/4

11:45 am-9:15 pm

2 stops39h 30m

$871

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 November. Flight prices, which tend to average around $709, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from St. Louis averaging around $721.

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 Sunday. Travelers who choose to depart for London on a Sunday will often find tickets for as low as $658. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $814. 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 evening is the least expensive time of day to depart. momondo users have found prices as low as $760 when looking at flights departing in the evening. 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.

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

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

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 $884 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 $769 on momondo.

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

There are 3 cabin classes available to choose from on Lambert-St Louis to London 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 flights?

You could potentially save up to 6% 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 December 2025, prices for St. Louis to London flights are approximately 83% 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

Best Price Found

$280

Fastest flight time

8h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in London

6 airports
The best one-way flight to London from St. Louis in the past 72 hours is $280. The best round-trip flight deal from St. Louis to London found on momondo in the last 72 hours is $662.
The fastest flight from St. Louis to London takes 8h 05m
Direct flights go from St. Louis to London on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
There are 6 airports in London. From St. Louis there are direct flights to London Heathrow (LHR).
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 8h 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 plane model from St. Louis to London?

  • 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
1,430 reviews
Search KLM flights
Air CanadaPriceFrom $573Free CancellationRating
7.1
10,525 reviews
Search Air Canada flights
DeltaPriceFrom $577Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $580Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
British AirwaysPriceFrom $580Free CancellationRating
6.7
7,575 reviews
Search British Airways flights
IberiaPriceFrom $597Free CancellationRating
7.0
3,051 reviews
Search Iberia flights
Scandinavian AirlinesPriceFrom $602Free CancellationRating
7.4
1,606 reviews
Search Scandinavian Airlines flights
American AirlinesPriceFrom $610Free CancellationRating
7.2
11,052 reviews
Search American Airlines flights
LufthansaPriceFrom $670Free CancellationRating
6.8
7,628 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom $736Free CancellationRating
7.5
675 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
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Brentwood
Wembley
Watford
Ilford
Cobham
Folkestone
Romford
Richmond
Uxbridge
Stansted

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