Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from London to St. Louis from $382

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to St. Louis departing on 9/1. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize 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 London to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Virgin Atlantic Logo
12:25 pm - 11:01 pm
LHR
-
STL
16h 36m
1 stop
Virgin Atlantic Logo
5:45 pm - 7:10 am
STL
-
LHR
31h 25m
1 stop
$867Virgin Atlantic
Wed, Sep 23 - Sun, Oct 4
Multiple Airlines Logo
2:00 pm - 11:49 pm
LGW
-
STL
15h 49m
1 stop
Multiple Airlines Logo
5:06 pm - 10:00 am
STL
-
LGW
34h 54m
2 stops
$871Multiple Airlines
Fri, Jun 19 - Fri, Jul 3
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
4:47 pm - 12:10 pm
STL
-
LHR
13h 23m
1 stop
$873British Airways
Tue, Sep 22 - Wed, Sep 30
Multiple Airlines Logo
6:30 am - 1:25 pm
LHR
-
STL
12h 55m
1 stop
Multiple Airlines Logo
9:40 pm - 11:40 am
STL
-
LHR
8h 00mnonstop
$874Multiple Airlines
Wed, Sep 23 - Sun, Oct 4
British Airways Logo
7:50 am - 7:25 pm
LHR
-
STL
17h 35m
2 stops
British Airways Logo
9:46 am - 8:00 am
STL
-
LHR
16h 14m
1 stop
$875British Airways
Mon, Sep 7 - Mon, Sep 14
Multiple Airlines Logo
2:00 pm - 11:49 pm
LGW
-
STL
15h 49m
1 stop
Multiple Airlines Logo
5:06 pm - 10:00 am
STL
-
LGW
34h 54m
2 stops
$875Multiple Airlines
Fri, Jun 19 - Fri, Jul 3
Finnair Logo
12:15 pm - 11:59 pm
LHR
-
STL
17h 44m
1 stop
Finnair Logo
4:29 pm - 12:15 pm
STL
-
LHR
13h 46m
1 stop
$877Finnair
Wed, Sep 2 - Wed, Sep 23
Delta Logo
6:30 am - 2:31 pm
LHR
-
STL
14h 01m
2 stops
Delta Logo
5:30 pm - 1:15 pm
STL
-
LHR
13h 45m
1 stop
$879Delta
Tue, Sep 15 - Wed, Sep 23
Delta Logo
6:30 am - 4:45 pm
LHR
-
STL
16h 15m
2 stops
Delta Logo
3:42 pm - 11:20 am
STL
-
LHR
13h 38m
1 stop
$880Delta
Wed, Sep 16 - Wed, Sep 23
Iberia Logo
9:50 am - 8:03 pm
LCY
-
STL
40h 13m
2 stops
Iberia Logo
4:29 pm - 9:00 am
STL
-
LCY
34h 31m
2 stops
$1,101Iberia
Thu, Sep 17 - Mon, Sep 21

Aer Lingus flights from London to St. Louis

Our best Aer Lingus deals on London to St. Louis flight tickets
Aer Lingus
May 18
LHR1:25 pmLondon Heathrow
16h 31m
2 stops
STL11:56 pmLambert-St Louis
Jun 15
STL9:08 amLambert-St Louis
22h 22m
2 stops
LHR1:30 pmLondon Heathrow
$1,125
Aer Lingus
Sep 16
LCY9:10 amLondon City
20h 10m
2 stops
STL11:20 pmLambert-St Louis
Sep 30
STL6:20 amLambert-St Louis
22h 00m
2 stops
LCY10:20 amLondon City
$1,136
Aer Lingus
May 18
LHR7:40 amLondon Heathrow
22h 16m
2 stops
STL11:56 pmLambert-St Louis
Jun 14
STL5:03 pmLambert-St Louis
14h 52m
2 stops
LHR1:55 pmLondon Heathrow
$1,148

Iberia flights from London to St. Louis

Our best Iberia deals on London to St. Louis flight tickets
Iberia
Sep 16
LHR7:50 amLondon Heathrow
18h 13m
2 stops
STL8:03 pmLambert-St Louis
Sep 23
STL6:51 pmLambert-St Louis
13h 34m
1 stop
LHR2:25 pmLondon Heathrow
$914
Iberia
Sep 17
LCY9:50 amLondon City
40h 13m
2 stops
STL8:03 pmLambert-St Louis
Sep 21
STL4:29 pmLambert-St Louis
34h 31m
2 stops
LCY9:00 amLondon City
$1,101
Iberia
May 29
LHR4:25 pmLondon Heathrow
13h 34m
1 stop
STL11:59 pmLambert-St Louis
Jun 14
STL8:14 pmLambert-St Louis
29h 51m
1 stop
LHR8:05 amLondon Heathrow
$1,147

momondo Fare Finder

 
Customize your flight search to find flights from London to St. Louis 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 May 16, 2026.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/23

12:25 pm-11:01 pm

1 stop16h 36m

Lambert-St Louis

Sun 10/4

5:45 pm-7:10 am

1 stop31h 25m

$867

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 6/19

2:00 pm-11:49 pm

1 stop15h 49m

Lambert-St Louis

Fri 7/3

5:06 pm-10:00 am

2 stops34h 54m

$871

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/22

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/30

4:47 pm-12:10 pm

1 stop13h 23m

$873
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/23

6:30 am-1:25 pm

1 stop12h 55m

Lambert-St Louis

Sun 10/4

9:40 pm-11:40 am

Nonstop8h 00m

$874

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 9/7

7:50 am-7:25 pm

2 stops17h 35m

Lambert-St Louis

Mon 9/14

9:46 am-8:00 am

1 stop16h 14m

$875

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 6/19

2:00 pm-11:49 pm

1 stop15h 49m

Lambert-St Louis

Fri 7/3

5:06 pm-10:00 am

2 stops34h 54m

$875

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

12:15 pm-11:59 pm

1 stop17h 44m

Lambert-St Louis

Wed 9/23

4:29 pm-12:15 pm

1 stop13h 46m

$877

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/15

6:30 am-2:31 pm

2 stops14h 01m

Lambert-St Louis

Wed 9/23

5:30 pm-1:15 pm

1 stop13h 45m

$879

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/16

6:30 am-4:45 pm

2 stops16h 15m

Lambert-St Louis

Wed 9/23

3:42 pm-11:20 am

1 stop13h 38m

$880

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 9/17

9:50 am-8:03 pm

2 stops40h 13m

Lambert-St Louis

Mon 9/21

4:29 pm-9:00 am

2 stops34h 31m

$1,101

Flights are sorted by cheapest round-trip flights first.

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

See travel insights to St. Louis from

How to get the cheapest flight ticket from London to St. Louis

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 London and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, August is the cheapest month to fly from London to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $91. The month of September is another great option to travel to St. Louis, with average flight prices from London averaging around $170.

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

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

How far in advance should I book a flight from London to St. Louis?

You are more likely to see cheaper flights to St. Louis from London when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $988 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London for as low as $813 on momondo.

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

No. A direct flight is the cheapest option for a flight between London to St. Louis.

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

As of May 2026, prices for London to St. Louis flights are approximately 11% cheaper when compared to flights at the same time last year.

When to book flights from London to St. Louis

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

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

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

Best Price Found

$651

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from London in the past 72 hours is $651. The best round-trip flight deal from London to St. Louis found on momondo in the last 72 hours is $998.
The fastest flight from London to St. Louis takes 9h 05m
Direct flights go from London to St. Louis on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
There is 1 airport in St. Louis. From London there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from London to St. Louis

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

    Lambert-St Louis is 4197.7 mi away from London. By plane, this route typically takes 9h 05m.

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

    Prices for flights from London to Lambert-St Louis Airport are refreshed on a daily basis.

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

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

    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 London to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis 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 Lambert-St Louis 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 London to St. Louis?

Best airlines flying from London to St. Louis

Compare and see reviews for airlines that fly from London to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $555Free CancellationRating
6.7
7,981 reviews
Search British Airways flights
American AirlinesPriceFrom $692Free CancellationRating
7.1
11,662 reviews
Search American Airlines flights

  • American Airlines Flights From London to St. Louis

    American Airlines is one of the most popular airlines flying from London to St. Louis, operating 4 flights/week on average for this route. A good American Airlines flight deal for London to St. Louis starts from $692 round-trip, up to an average price of $1,143. Our users have rated American Airlines at 7.1/10.

  • British Airways Flights From London to St. Louis

    Another popular option for London to St. Louis flights is British Airways (6.7/10, 7,981 ratings). British Airways flies from London to St. Louis around 4 times per week, with deals starting from $555 round-trip and rising to an average price of around $869.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Festus
Clayton
Eureka
Litchfield
Edwardsville
Shrewsbury
Grafton

Why use momondo?

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

Finding the right flight to St. Louis from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

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

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

Once all potential London to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to St. Louis from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize 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
Mon 6/15
Mon 6/22
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States