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Cheap flights from St. Louis to the United Kingdom from $216

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 the United Kingdom departing on 3/20. 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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Find the cheapest flights from St. Louis to the United Kingdom

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:19 pm - 11:45 am
STL
-
MAN
15h 26m
2 stops
Multiple Airlines Logo
6:20 pm - 10:59 am
MAN
-
STL
21h 39m
2 stops
$624Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
British Airways Logo
4:30 pm - 4:10 pm
STL
-
GLA
17h 40m
2 stops
British Airways Logo
8:50 pm - 7:30 pm
GLA
-
STL
28h 40m
1 stop
$627British Airways
Mon, Apr 13 - Mon, Apr 20
KLM Logo
11:55 am - 7:50 am
STL
-
LHR
13h 55m
1 stop
KLM Logo
8:25 pm - 4:32 pm
LHR
-
STL
25h 07m
2 stops
$630KLM
Mon, Mar 2 - Mon, Mar 9
Virgin Atlantic Logo
6:47 pm - 11:40 am
STL
-
LHR
10h 53m
1 stop
Virgin Atlantic Logo
3:50 pm - 11:36 pm
LHR
-
STL
13h 46m
1 stop
$640Virgin Atlantic
Mon, Feb 23 - Wed, Mar 4
United Airlines Logo
9:55 am - 5:55 am
STL
-
LHR
14h 00m
1 stop
United Airlines Logo
6:50 am - 4:02 pm
LHR
-
STL
15h 12m
2 stops
$642United Airlines
Tue, Feb 24 - Tue, Mar 3
Delta Logo
9:59 am - 7:50 am
STL
-
LHR
15h 51m
1 stop
Delta Logo
10:00 am - 8:43 pm
LHR
-
STL
16h 43m
2 stops
$643Delta
Mon, Feb 9 - Wed, Feb 25
United Airlines Logo
11:22 am - 6:20 am
STL
-
LHR
12h 58m
1 stop
United Airlines Logo
6:50 am - 8:23 pm
LHR
-
STL
19h 33m
2 stops
$644United Airlines
Tue, Feb 10 - Tue, Mar 3
American Airlines Logo
6:57 pm - 7:40 pm
STL
-
INV
18h 43m
2 stops
American Airlines Logo
11:45 am - 8:55 am
INV
-
STL
27h 10m
2 stops
$654American Airlines
Thu, Feb 19 - Thu, Feb 26
American Airlines Logo
6:57 pm - 7:40 pm
STL
-
INV
18h 43m
2 stops
American Airlines Logo
11:45 am - 8:55 am
INV
-
STL
27h 10m
2 stops
$655American Airlines
Thu, Feb 19 - Thu, Feb 26
Delta Logo
12:23 pm - 10:00 am
STL
-
MAN
15h 37m
2 stops
Delta Logo
5:55 am - 11:34 pm
MAN
-
STL
23h 39m
2 stops
$657Delta
Tue, Apr 21 - Thu, Apr 30

KLM flights from St. Louis to United Kingdom

Our best KLM deals on St. Louis to United Kingdom flight tickets
KLM
Mar 2
STL11:55 amLambert-St Louis
13h 55m
1 stop
LHR7:50 amLondon Heathrow
Mar 9
LHR8:25 pmLondon Heathrow
25h 07m
2 stops
STL4:32 pmLambert-St Louis
$630
KLM
Feb 9
STL12:00 pmLambert-St Louis
16h 10m
2 stops
MAN10:10 amManchester
Feb 13
MAN1:25 pmManchester
13h 16m
1 stop
STL8:41 pmLambert-St Louis
$1,198

United Airlines flights from St. Louis to United Kingdom

Our best United Airlines deals on St. Louis to United Kingdom flight tickets
United Airlines
Feb 24
STL9:55 amLambert-St Louis
14h 00m
1 stop
LHR5:55 amLondon Heathrow
Mar 3
LHR6:50 amLondon Heathrow
15h 12m
2 stops
STL4:02 pmLambert-St Louis
$642
United Airlines
Feb 23
STL1:11 pmLambert-St Louis
12h 44m
1 stop
LHR7:55 amLondon Heathrow
Mar 25
LHR11:10 amLondon Heathrow
16h 49m
2 stops
STL10:59 pmLambert-St Louis
$644
United Airlines
Feb 10
STL9:57 amLambert-St Louis
15h 13m
2 stops
LHR7:10 amLondon Heathrow
Mar 3
LHR6:50 amLondon Heathrow
19h 33m
2 stops
STL8:23 pmLambert-St Louis
$647

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to United Kingdom 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 February 4, 2026.
Use the filters below to find and compare flights from St. Louis to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisManchester

STL - MAN

STLMAN

Lambert-St Louis

Mon 3/2

2:19 pm-11:45 am

2 stops15h 26m

Manchester

Mon 3/9

6:20 pm-10:59 am

2 stops21h 39m

$624

St. LouisGlasgow

STL - GLA

STLGLA

Lambert-St Louis

Mon 4/13

4:30 pm-4:10 pm

2 stops17h 40m

Glasgow Intl

Mon 4/20

8:50 pm-7:30 pm

1 stop28h 40m

$627

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/2

11:55 am-7:50 am

1 stop13h 55m

London Heathrow

Mon 3/9

8:25 pm-4:32 pm

2 stops25h 07m

$630

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/23

6:47 pm-11:40 am

1 stop10h 53m

London Heathrow

Wed 3/4

3:50 pm-11:36 pm

1 stop13h 46m

$640

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 2/24

9:55 am-5:55 am

1 stop14h 00m

London Heathrow

Tue 3/3

6:50 am-4:02 pm

2 stops15h 12m

$642

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/9

9:59 am-7:50 am

1 stop15h 51m

London Heathrow

Wed 2/25

10:00 am-8:43 pm

2 stops16h 43m

$643

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 2/10

11:22 am-6:20 am

1 stop12h 58m

London Heathrow

Tue 3/3

6:50 am-8:23 pm

2 stops19h 33m

$644

St. LouisInverness

STL - INV

STLINV

Lambert-St Louis

Thu 2/19

6:57 pm-7:40 pm

2 stops18h 43m

Inverness

Thu 2/26

11:45 am-8:55 am

2 stops27h 10m

$654

St. LouisInverness

STL - INV

STLINV

Lambert-St Louis

Thu 2/19

6:57 pm-7:40 pm

2 stops18h 43m

Inverness

Thu 2/26

11:45 am-8:55 am

2 stops27h 10m

$655

St. LouisManchester

STL - MAN

STLMAN

Lambert-St Louis

Tue 4/21

12:23 pm-10:00 am

2 stops15h 37m

Manchester

Thu 4/30

5:55 am-11:34 pm

2 stops23h 39m

$657

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 the United Kingdom from

How to get the cheapest flight ticket from St. Louis to United Kingdom

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 cheapest month to fly to United Kingdom?

In general, October is the cheapest month to fly from St. Louis to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $709. If you aren’t able to travel to United Kingdom during the month of October, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $709.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from St. Louis to United Kingdom is on a Monday when prices can be found for as low as $688. The most expensive day to fly to United Kingdom is Sunday, with ticket prices averaging around $866.

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

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

How far in advance should I book a flight to United Kingdom?

You are more likely to see cheaper flights to United Kingdom from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around $862 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from St. Louis for as low as $768 on momondo.

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

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

You could potentially save up to 43% on your flight if you consider stops on a St. Louis to United Kingdom flight.

Cheap St. Louis to United Kingdom flight deals and tips

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

Best Price Found

$465

Fastest flight time

8h 00m

Direct flights

Mon, Wed, Thu and Sat

Airports in United Kingdom

1,286 airports
The best one-way flight to United Kingdom from St. Louis in the past 72 hours is $465. The best round-trip flight deal from St. Louis to United Kingdom found on momondo in the last 72 hours is $669.
The fastest flight from St. Louis to United Kingdom takes 8h 00m
Direct flights go from St. Louis to United Kingdom on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
There are 1,286 airports in United Kingdom. From St. Louis there are direct flights to London Heathrow (LHR).
Search flight deals

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

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

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

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

    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 United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The necessary travel and health documents for your United Kingdom trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from St. Louis to United Kingdom?

Best airlines flying from St. Louis to United Kingdom

Compare and see reviews for airlines that fly from St. Louis to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $529Free CancellationRating
7.7
1,449 reviews
Search KLM flights
Air CanadaPriceFrom $573Free CancellationRating
7.1
10,690 reviews
Search Air Canada flights
British AirwaysPriceFrom $574Free CancellationRating
6.7
7,716 reviews
Search British Airways flights
DeltaPriceFrom $577Free CancellationRating
7.9
8,149 reviews
Search Delta flights
IberiaPriceFrom $580Free CancellationRating
7.0
3,104 reviews
Search Iberia flights
United AirlinesPriceFrom $580Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
American AirlinesPriceFrom $596Free CancellationRating
7.2
11,234 reviews
Search American Airlines flights
Scandinavian AirlinesPriceFrom $602Free CancellationRating
7.3
1,677 reviews
Search Scandinavian Airlines flights
Virgin AtlanticPriceFrom $615Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
LufthansaPriceFrom $629Free CancellationRating
6.8
7,761 reviews
Search Lufthansa flights

Why use momondo?

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

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

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

momondo does allow users to show only those flights to United Kingdom 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 United Kingdom?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to United Kingdom.

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

Yes. momondo can track prices for St. Louis to United Kingdom 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

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to Londonfrom $341
Flights to Manchesterfrom $376
Flights to Edinburghfrom $354
Flights to Birminghamfrom $391
Flights to Glasgowfrom $359
Flights to Newcastle upon Tynefrom $517
Flights to Belfastfrom $451
Flights to Bristolfrom $390
Flights to Invernessfrom $423
Flights to Liverpoolfrom $438
Flights to Aberdeenfrom $533
Flights to Leedsfrom $446