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Cheap flights from St. Louis to the United Kingdom from $315

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 9/14. 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

Logo
9:15 am - 6:30 amSTL-LHR
15h 15m2 stops
Logo
6:50 am - 3:18 pmLHR-STL
14h 28m2 stops
$491
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Tue, Sep 23 - Tue, Sep 30
United Airlines Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
United Airlines Logo
2:05 pm - 10:49 amLHR-STL
26h 44m2 stops
$502United Airlines
Find Deal
Tue, Oct 14 - Wed, Oct 22
British Airways Logo
5:09 pm - 10:50 amSTL-LHR
11h 41m1 stop
British Airways Logo
10:30 am - 6:36 pmLHR-STL
14h 06m1 stop
$509British Airways
Find Deal
Tue, Oct 14 - Wed, Oct 22
British Airways Logo
5:52 pm - 12:45 pmSTL-LHR
12h 53m1 stop
British Airways Logo
7:30 pm - 7:09 pmLHR-STL
29h 39m2 stops
$516British Airways
Find Deal
Mon, Aug 18 - Wed, Aug 27
Delta Logo
5:11 pm - 1:30 pmSTL-LHR
14h 19m1 stop
Delta Logo
6:15 am - 4:45 pmLHR-STL
16h 30m2 stops
$521Delta
Find Deal
Mon, Aug 18 - Wed, Aug 27
Delta Logo
7:00 am - 6:45 amSTL-LHR
17h 45m1 stop
Delta Logo
11:30 am - 10:02 pmLHR-STL
16h 32m2 stops
$522Delta
Find Deal
Tue, Aug 19 - Wed, Aug 27
Iberia Logo
5:09 pm - 6:25 amSTL-LHR
31h 16m1 stop
Iberia Logo
2:25 pm - 8:26 pmLHR-STL
12h 01m1 stop
$529Iberia
Find Deal
Sat, Oct 11 - Tue, Oct 21
Iberia Logo
5:52 pm - 12:45 pmSTL-LHR
12h 53m1 stop
Iberia Logo
3:10 pm - 11:03 pmLHR-STL
13h 53m1 stop
$573Iberia
Find Deal
Wed, Aug 13 - Sun, Aug 17
American Airlines Logo
9:57 am - 8:35 amSTL-LGW
16h 38m2 stops
American Airlines Logo
10:40 am - 11:48 pmLGW-STL
19h 08m2 stops
$602American Airlines
Find Deal
Mon, Sep 8 - Mon, Sep 15
American Airlines Logo
8:03 pm - 5:45 pmSTL-EDI
15h 42m2 stops
American Airlines Logo
11:35 am - 9:06 pmEDI-STL
15h 31m1 stop
$661American Airlines
Find Deal
Sun, Sep 7 - Wed, Sep 17

British Airways flights from St. Louis to United Kingdom

Our best British Airways deals on St. Louis to United Kingdom flight tickets
British Airways
Oct 14
STL5:09 pmLambert-St Louis
11h 41m
1 stop
LHR10:50 amLondon Heathrow
Oct 22
LHR10:30 amLondon Heathrow
14h 06m
1 stop
STL6:36 pmLambert-St Louis
$509
Find similar
British Airways
Aug 18
STL5:52 pmLambert-St Louis
12h 53m
1 stop
LHR12:45 pmLondon Heathrow
Aug 27
LHR7:30 pmLondon Heathrow
29h 39m
2 stops
STL7:09 pmLambert-St Louis
$516
Find similar
British Airways
Aug 18
STL1:15 pmLambert-St Louis
12h 50m
1 stop
LHR8:05 amLondon Heathrow
Aug 27
LHR12:15 pmLondon Heathrow
12h 08m
1 stop
STL6:23 pmLambert-St Louis
$518
Find similar

United Airlines flights from St. Louis to United Kingdom

Our best United Airlines deals on St. Louis to United Kingdom flight tickets
United Airlines
Oct 14
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
Oct 22
LHR2:05 pmLondon Heathrow
26h 44m
2 stops
STL10:49 amLambert-St Louis
$502
Find similar
United Airlines
Oct 21
STL4:05 pmLambert-St Louis
13h 45m
1 stop
LHR11:50 amLondon Heathrow
Oct 30
LHR1:25 pmLondon Heathrow
30h 00m
2 stops
STL2:25 pmLambert-St Louis
$508
Find similar
United Airlines
Oct 8
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
Oct 14
LHR6:55 amLondon Heathrow
21h 40m
2 stops
STL10:35 pmLambert-St Louis
$510
Find similar

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 August 2, 2025.
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. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/23

9:15 am-6:30 am

2 stops15h 15m

London Heathrow

Tue 9/30

6:50 am-3:18 pm

2 stops14h 28m

$491

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 10/14

1:30 pm-6:30 am

1 stop11h 00m

London Heathrow

Wed 10/22

2:05 pm-10:49 am

2 stops26h 44m

$502

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 10/14

5:09 pm-10:50 am

1 stop11h 41m

London Heathrow

Wed 10/22

10:30 am-6:36 pm

1 stop14h 06m

$509

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/18

5:52 pm-12:45 pm

1 stop12h 53m

London Heathrow

Wed 8/27

7:30 pm-7:09 pm

2 stops29h 39m

$516

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/18

5:11 pm-1:30 pm

1 stop14h 19m

London Heathrow

Wed 8/27

6:15 am-4:45 pm

2 stops16h 30m

$521

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/19

7:00 am-6:45 am

1 stop17h 45m

London Heathrow

Wed 8/27

11:30 am-10:02 pm

2 stops16h 32m

$522

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 10/11

5:09 pm-6:25 am

1 stop31h 16m

London Heathrow

Tue 10/21

2:25 pm-8:26 pm

1 stop12h 01m

$529

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/13

5:52 pm-12:45 pm

1 stop12h 53m

London Heathrow

Sun 8/17

3:10 pm-11:03 pm

1 stop13h 53m

$573

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 9/8

9:57 am-8:35 am

2 stops16h 38m

London Gatwick

Mon 9/15

10:40 am-11:48 pm

2 stops19h 08m

$602

St. LouisEdinburgh

STL - EDI

STLEDI

Lambert-St Louis

Sun 9/7

8:03 pm-5:45 pm

2 stops15h 42m

Edinburgh Turnhouse

Wed 9/17

11:35 am-9:06 pm

1 stop15h 31m

$661

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 $764. If you aren’t able to travel to United Kingdom during the month of October, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $767.

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 Wednesday when prices can be found for as low as $846. The most expensive day to fly to United Kingdom is Tuesday, with ticket prices averaging around $1,006.

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

According to our data, the cheapest time of day to fly to United Kingdom is in the morning. momondo users have found flights departing from St. Louis to United Kingdom in the morning for as low as $915. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom 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.

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 $941 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 $820 on momondo.

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

You could potentially save up to 11% 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

$315

Fastest flight time

10h 10m

Direct flights

None

Airports in United Kingdom

7 airports
The best one-way flight to United Kingdom from St. Louis in the past 72 hours is $315. The best round-trip flight deal from St. Louis to United Kingdom found on momondo in the last 72 hours is $491.
The fastest flight from St. Louis to United Kingdom takes 10h 10m
There are no direct flights from St. Louis to United Kingdom. Popular non-direct routes for this connection are Lambert-St Louis Airport - London Gatwick Airport, Lambert-St Louis Airport - Manchester Airport and Lambert-St Louis Airport - London Heathrow Airport.
There are 7 airports near United Kingdom: London City (LCY), London Heathrow (LHR), London Luton (LTN), Manchester (MAN), Edinburgh Turnhouse (EDI), London Stansted (STN), London Gatwick (LGW)
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  • 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.

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
7.8
1,384 reviews
Search KLM flights
British AirwaysPriceFrom $597Free CancellationRating
6.6
7,224 reviews
Search British Airways flights
Air CanadaPriceFrom $627Free CancellationRating
7.1
9,855 reviews
Search Air Canada flights
DeltaPriceFrom $638Free CancellationRating
8.0
7,983 reviews
Search Delta flights
American AirlinesPriceFrom $640Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Scandinavian AirlinesPriceFrom $669Free CancellationRating
7.3
1,457 reviews
Search Scandinavian Airlines flights
IberiaPriceFrom $669Free CancellationRating
7.0
2,862 reviews
Search Iberia flights
United AirlinesPriceFrom $672Free CancellationRating
7.4
8,904 reviews
Search United Airlines flights
LufthansaPriceFrom $696Free CancellationRating
6.8
7,276 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom $699Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic 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.

An easier way to manage your United Kingdom trip

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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 $310
Flights to Manchesterfrom $372
Flights to Edinburghfrom $405
Flights to Glasgowfrom $417
Flights to Birminghamfrom $384
Flights to Belfastfrom $442
Flights to Newcastle upon Tynefrom $462
Flights to Bristolfrom $465
Flights to Invernessfrom $402
Flights to Liverpoolfrom $475
Flights to Aberdeenfrom $506
Flights to Leedsfrom $473