Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to London from £327

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 28/7. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to London

Cheap return flights

Enter your travel dates to find the best prices.
Lufthansa Logo
18:55 - 18:25
STL
-
LHR
17h 30m
2 stops
Lufthansa Logo
10:50 - 22:45
LHR
-
STL
17h 55m
2 stops
£588Lufthansa
Tue, 28 Apr - Wed, 6 May
Lufthansa Logo
18:55 - 18:25
STL
-
LHR
17h 30m
2 stops
Lufthansa Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£589Lufthansa
Tue, 28 Apr - Wed, 6 May
Lufthansa Logo
15:30 - 12:40
STL
-
LHR
15h 10m
1 stop
Lufthansa Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£593Lufthansa
Wed, 26 Aug - Tue, 8 Sep
Lufthansa Logo
15:30 - 16:40
STL
-
LHR
19h 10m
1 stop
Lufthansa Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£593Lufthansa
Wed, 2 Sep - Fri, 11 Sep
Lufthansa Logo
19:09 - 16:40
STL
-
LHR
15h 31m
2 stops
Lufthansa Logo
10:50 - 21:13
LHR
-
STL
16h 23m
2 stops
£596Lufthansa
Tue, 5 May - Tue, 19 May
Multiple Airlines Logo
07:05 - 09:35
STL
-
LHR
20h 30m
1 stop
Multiple Airlines Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£596Multiple Airlines
Mon, 4 May - Wed, 13 May
Lufthansa Logo
15:30 - 17:40
STL
-
LHR
20h 10m
1 stop
Lufthansa Logo
11:30 - 23:11
LHR
-
STL
17h 41m
2 stops
£599Lufthansa
Wed, 22 Apr - Wed, 29 Apr
Lufthansa Logo
15:30 - 10:40
STL
-
LHR
13h 10m
1 stop
Lufthansa Logo
06:30 - 15:38
LHR
-
STL
15h 08m
2 stops
£600Lufthansa
Mon, 21 Sep - Tue, 13 Oct
Lufthansa Logo
18:55 - 18:25
STL
-
LHR
17h 30m
2 stops
Lufthansa Logo
19:30 - 13:25
LHR
-
STL
23h 55m
1 stop
£602Lufthansa
Mon, 17 Aug - Mon, 24 Aug
Lufthansa Logo
18:55 - 20:40
STL
-
LHR
19h 45m
2 stops
Lufthansa Logo
06:30 - 21:13
LHR
-
STL
20h 43m
2 stops
£603Lufthansa
Tue, 21 Apr - Tue, 28 Apr

British Airways flights from St. Louis to London Heathrow Airport

Our best British Airways deals on St. Louis to London Heathrow Airport flight tickets
British Airways
14 Apr
STL16:30Lambert-St Louis
10h 35m
1 stop
LHR09:05London Heathrow
21 Apr
LHR16:25London Heathrow
9h 05m
STL19:30Lambert-St Louis
£621
British Airways
2 Sept
STL21:35Lambert-St Louis
8h 00m
LHR11:35London Heathrow
11 Sept
LHR12:30London Heathrow
12h 28m
1 stop
STL18:58Lambert-St Louis
£622
British Airways
2 Sept
STL21:35Lambert-St Louis
8h 00m
LHR11:35London Heathrow
11 Sept
LHR16:25London Heathrow
9h 05m
STL19:30Lambert-St Louis
£624

Lufthansa flights from St. Louis to London Heathrow Airport

Our best Lufthansa deals on St. Louis to London Heathrow Airport flight tickets
Lufthansa
28 Apr
STL18:55Lambert-St Louis
17h 30m
2 stops
LHR18:25London Heathrow
6 May
LHR10:50London Heathrow
17h 55m
2 stops
STL22:45Lambert-St Louis
£588
Lufthansa
28 Apr
STL18:55Lambert-St Louis
17h 30m
2 stops
LHR18:25London Heathrow
6 May
LHR06:30London Heathrow
12h 55m
1 stop
STL13:25Lambert-St Louis
£589
Lufthansa
29 Mar
STL15:30Lambert-St Louis
17h 10m
1 stop
LHR14:40London Heathrow
14 Apr
LHR10:50London Heathrow
16h 23m
2 stops
STL21:13Lambert-St Louis
£593

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 27 March 2026.
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

Cheapest return flight

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 28/4

18:55-18:25

2 stops17h 30m

London Heathrow

Wed 6/5

10:50-22:45

2 stops17h 55m

£588

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 28/4

18:55-18:25

2 stops17h 30m

London Heathrow

Wed 6/5

06:30-13:25

1 stop12h 55m

£589
Fastest return journey

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 26/8

15:30-12:40

1 stop15h 10m

London Heathrow

Tue 8/9

06:30-13:25

1 stop12h 55m

£593

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 2/9

15:30-16:40

1 stop19h 10m

London Heathrow

Fri 11/9

06:30-13:25

1 stop12h 55m

£593

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/5

19:09-16:40

2 stops15h 31m

London Heathrow

Tue 19/5

10:50-21:13

2 stops16h 23m

£596

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/5

07:05-09:35

1 stop20h 30m

London Heathrow

Wed 13/5

06:30-13:25

1 stop12h 55m

£596

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 22/4

15:30-17:40

1 stop20h 10m

London Heathrow

Wed 29/4

11:30-23:11

2 stops17h 41m

£599

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 21/9

15:30-10:40

1 stop13h 10m

London Heathrow

Tue 13/10

06:30-15:38

2 stops15h 08m

£600

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 17/8

18:55-18:25

2 stops17h 30m

London Heathrow

Mon 24/8

19:30-13:25

1 stop23h 55m

£602

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 21/4

18:55-20:40

2 stops19h 45m

London Heathrow

Tue 28/4

06:30-21:13

2 stops20h 43m

£603

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

What is the cheapest month to fly to London Heathrow Airport?

In general, October is the cheapest month to fly from St. Louis to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £503. The month of November is another great option to travel to London Heathrow Airport, with average flight prices from St. Louis averaging around £531.

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

On average, the least expensive day to fly to London Heathrow Airport from St. Louis is on a Friday. momondo users have found tickets for Friday departures for as low as £477. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Tuesday is £907.

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 £631 when searching weeks before you fly. 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 £566 on momondo.

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

There is only 1 cabin class 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.

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

As of March 2026, prices for St. Louis to London Heathrow Airport flights are approximately 2% more expensive when compared to flights at the same time last year.

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 return 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

£924

Fastest flight time

8h 00m

Direct flights

Mon, Wed, Thu and Sat
The best flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is £924
The fastest flight from St. Louis to London Heathrow Airport takes 8h 00m
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 00m.

  • 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?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 travel and health documents you'll need for your trip to London Heathrow Airport 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 Heathrow Airport. 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 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
Virgin AtlanticPriceFrom £411Free CancellationRating
7.5
685 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £434Free CancellationRating
6.7
7,821 reviews
Search British Airways flights

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Stratford-upon-Avon
Northampton
Swindon
Southend-on-Sea
Ipswich
Wembley
Canterbury
Ilford
Guildford
Poole
Hayes
Chelmsford
Dover
Folkestone

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?

Yes. All flights to London from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

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?

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.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 26/4
Sun 3/5
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London