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Cheap flights from St. Louis to London from £196

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 1/3. 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 return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
16:05 - 08:30
STL
-
LHR
10h 25m
1 stop
Multiple Airlines Logo
06:30 - 14:55
LHR
-
STL
13h 25m
1 stop
£480Multiple Airlines
Thu, 5 Mar - Wed, 18 Mar
British Airways Logo
14:54 - 07:00
STL
-
LHR
10h 06m
1 stop
British Airways Logo
11:00 - 18:00
LHR
-
STL
13h 00m
1 stop
£480British Airways
Mon, 9 Feb - Sat, 28 Feb
British Airways Logo
14:19 - 06:55
STL
-
LHR
10h 36m
1 stop
British Airways Logo
15:45 - 23:48
LHR
-
STL
14h 03m
1 stop
£481British Airways
Thu, 19 Feb - Wed, 25 Feb
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
British Airways Logo
12:30 - 19:27
LHR
-
STL
12h 57m
1 stop
£482British Airways
Fri, 1 May - Wed, 20 May
Air Canada Logo
16:05 - 08:30
STL
-
LHR
10h 25m
1 stop
Air Canada Logo
18:00 - 21:05
LHR
-
STL
33h 05m
2 stops
£482Air Canada
Sun, 15 Feb - Thu, 26 Feb
United Airlines Logo
18:55 - 11:15
STL
-
LHR
10h 20m
1 stop
United Airlines Logo
06:50 - 16:02
LHR
-
STL
15h 12m
2 stops
£484United Airlines
Wed, 18 Feb - Sun, 22 Feb
United Airlines Logo
11:25 - 07:10
STL
-
LHR
14h 45m
2 stops
United Airlines Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£485United Airlines
Tue, 24 Mar - Wed, 8 Apr
Delta Logo
07:10 - 06:25
STL
-
LHR
17h 15m
1 stop
Delta Logo
06:20 - 16:45
LHR
-
STL
16h 25m
2 stops
£486Delta
Thu, 19 Feb - Wed, 25 Feb
Delta Logo
12:04 - 07:15
STL
-
LCY
14h 11m
2 stops
Delta Logo
09:20 - 20:42
LCY
-
STL
17h 22m
2 stops
£492Delta
Mon, 23 Mar - Tue, 31 Mar
Multiple Airlines Logo
16:05 - 23:55
STL
-
STN
25h 50m
3 stops
Multiple Airlines Logo
08:00 - 13:55
STN
-
STL
35h 55m
2 stops
£503Multiple Airlines
Sat, 28 Feb - Sat, 7 Mar

Iberia flights from St. Louis to London

Our best Iberia deals on St. Louis to London flight tickets
Iberia
3 Feb
STL09:33Lambert-St Louis
27h 27m
2 stops
LGW19:00London Gatwick
10 Feb
LGW13:10London Gatwick
39h 34m
2 stops
STL22:44Lambert-St Louis
£588
Iberia
2 Feb
STL09:33Lambert-St Louis
27h 27m
2 stops
LGW19:00London Gatwick
8 Feb
LGW11:45London Gatwick
27h 18m
2 stops
STL09:03Lambert-St Louis
£618
Iberia
3 Feb
STL09:33Lambert-St Louis
27h 27m
2 stops
LGW19:00London Gatwick
13 Feb
LGW19:40London Gatwick
31h 32m
2 stops
STL21:12Lambert-St Louis
£626

British Airways flights from St. Louis to London

Our best British Airways deals on St. Louis to London flight tickets
British Airways
19 Feb
STL14:19Lambert-St Louis
10h 36m
1 stop
LHR06:55London Heathrow
26 Feb
LHR14:10London Heathrow
13h 02m
1 stop
STL21:12Lambert-St Louis
£481
British Airways
10 Apr
STL12:11Lambert-St Louis
14h 54m
1 stop
LHR09:05London Heathrow
15 Apr
LHR09:45London Heathrow
12h 31m
1 stop
STL16:16Lambert-St Louis
£482
British Airways
5 May
STL21:35Lambert-St Louis
8h 00m
LHR11:35London Heathrow
19 May
LHR16:25London Heathrow
9h 05m
STL19:30Lambert-St Louis
£483

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 16 January 2026.
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

Thu 5/3

16:05-08:30

1 stop10h 25m

London Heathrow

Wed 18/3

06:30-14:55

1 stop13h 25m

£480

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 9/2

14:54-07:00

1 stop10h 06m

London Heathrow

Sat 28/2

11:00-18:00

1 stop13h 00m

£480

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 19/2

14:19-06:55

1 stop10h 36m

London Heathrow

Wed 25/2

15:45-23:48

1 stop14h 03m

£481

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 1/5

21:35-11:35

Nonstop8h 00m

London Heathrow

Wed 20/5

12:30-19:27

1 stop12h 57m

£482

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 15/2

16:05-08:30

1 stop10h 25m

London Heathrow

Thu 26/2

18:00-21:05

2 stops33h 05m

£482

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 18/2

18:55-11:15

1 stop10h 20m

London Heathrow

Sun 22/2

06:50-16:02

2 stops15h 12m

£484

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 24/3

11:25-07:10

2 stops14h 45m

London Heathrow

Wed 8/4

06:30-13:25

1 stop12h 55m

£485

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 19/2

07:10-06:25

1 stop17h 15m

London Heathrow

Wed 25/2

06:20-16:45

2 stops16h 25m

£486

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Mon 23/3

12:04-07:15

2 stops14h 11m

London City

Tue 31/3

09:20-20:42

2 stops17h 22m

£492

St. LouisLondon

STL - STN

STLSTN

Lambert-St Louis

Sat 28/2

16:05-23:55

3 stops25h 50m

London Stansted

Sat 7/3

08:00-13:55

2 stops35h 55m

£503

Flights are sorted by cheapest return 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 £529, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from St. Louis averaging around £534.

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 £646 when searching weeks before you fly. 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 £573 on momondo.

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

As of January 2026, prices for St. Louis to London flights are approximately 24% cheaper 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 return 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

Fastest flight time

8h 00m

Direct flights

Mon, Wed, Thu and Sat

Airports in London

6 airports
The fastest flight from St. Louis to London takes 8h 00m
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. A reasonable flight in good conditions will take 8h 00m.

  • 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?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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
Virgin AtlanticPriceFrom £410Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £432Free CancellationRating
6.7
7,681 reviews
Search British Airways flights
Air CanadaPriceFrom £436Free CancellationRating
7.1
10,625 reviews
Search Air Canada flights

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Luton
Milton Keynes
Gatwick
Maidstone
Slough
Southend-on-Sea
Canterbury
Ipswich
Ilford
Guildford
Chelmsford
Hayes
Dover
Worthing
Hounslow
Bedford
Ramsgate
Colchester
Folkestone

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to London . Millions of users trust and use momondo every year so you are in good hands.

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?

momondo provides multiple filters to help you find the best flight to London from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for St. Louis to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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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