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Cheap flights from St. Louis to the United Kingdom from $235

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 10/4. 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

Delta Logo
10:45 am - 8:50 amSTL-LHR
16h 05m2 stops
Delta Logo
6:30 am - 5:29 pmLHR-STL
16h 59m2 stops
$530Delta
Find Deal
Tue, Oct 14 - Wed, Oct 22
Air Canada Logo
4:05 pm - 8:30 amSTL-LHR
10h 25m1 stop
Air Canada Logo
1:00 pm - 3:29 pmLHR-STL
32h 29m1 stop
$531Air Canada
Find Deal
Mon, Jan 19 - Fri, Jan 30
United Airlines Logo
3:19 pm - 11:20 amSTL-LHR
14h 01m2 stops
United Airlines Logo
8:00 am - 7:48 pmLHR-STL
17h 48m2 stops
$543United Airlines
Find Deal
Mon, Dec 8 - Tue, Dec 16
Iberia Logo
1:48 pm - 8:15 amSTL-LHR
12h 27m1 stop
Iberia Logo
7:40 pm - 9:57 amLHR-STL
20h 17m2 stops
$561Iberia
Find Deal
Thu, Jan 15 - Mon, Jan 26
United Airlines Logo
3:11 pm - 5:55 amSTL-LHR
32h 44m1 stop
United Airlines Logo
6:00 pm - 3:29 pmLHR-STL
27h 29m1 stop
$566United Airlines
Find Deal
Sat, Jan 10 - Sun, Jan 18
Iberia Logo
2:17 pm - 8:15 amSTL-LHR
11h 58m1 stop
Iberia Logo
3:00 pm - 10:34 pmLHR-STL
13h 34m1 stop
$576Iberia
Find Deal
Mon, Nov 17 - Sun, Nov 23
British Airways Logo
6:04 pm - 12:00 pmSTL-LHR
11h 56m1 stop
British Airways Logo
3:00 pm - 10:34 pmLHR-STL
13h 34m1 stop
$577British Airways
Find Deal
Wed, Nov 19 - Sun, Nov 23
American Airlines Logo
3:38 pm - 12:50 pmSTL-GLA
15h 12m2 stops
American Airlines Logo
11:40 am - 12:02 amGLA-STL
18h 22m2 stops
$656American Airlines
Find Deal
Wed, Nov 12 - Fri, Nov 21
American Airlines Logo
2:15 pm - 1:10 pmSTL-MAN
16h 55m2 stops
American Airlines Logo
9:20 am - 8:26 pmMAN-STL
17h 06m2 stops
$688American Airlines
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Tue, Oct 7 - Wed, Oct 15
British Airways Logo
5:54 pm - 6:45 pmSTL-MAN
18h 51m2 stops
British Airways Logo
8:05 pm - 4:50 pmMAN-STL
26h 45m2 stops
$689British Airways
Find Deal
Wed, Dec 10 - Mon, Dec 15

Iberia flights from St. Louis to United Kingdom

Our best Iberia deals on St. Louis to United Kingdom flight tickets
Iberia
Jan 15
STL1:48 pmLambert-St Louis
12h 27m
1 stop
LHR8:15 amLondon Heathrow
Jan 26
LHR7:40 pmLondon Heathrow
20h 17m
2 stops
STL9:57 amLambert-St Louis
$561
Find similar
Iberia
Nov 17
STL2:17 pmLambert-St Louis
11h 58m
1 stop
LHR8:15 amLondon Heathrow
Nov 23
LHR3:00 pmLondon Heathrow
13h 34m
1 stop
STL10:34 pmLambert-St Louis
$576
Find similar
Iberia
Sep 22
STL1:53 pmLambert-St Louis
17h 27m
2 stops
EDI1:20 pmEdinburgh Turnhouse
Oct 3
EDI11:35 amEdinburgh Turnhouse
15h 31m
1 stop
STL9:06 pmLambert-St Louis
$884
Find similar

Air Canada flights from St. Louis to United Kingdom

Our best Air Canada deals on St. Louis to United Kingdom flight tickets
Air Canada
Jan 19
STL4:05 pmLambert-St Louis
10h 25m
1 stop
LHR8:30 amLondon Heathrow
Jan 30
LHR1:00 pmLondon Heathrow
32h 29m
1 stop
STL3:29 pmLambert-St Louis
$531
Find similar
Air Canada
Nov 18
STL10:00 amLambert-St Louis
14h 30m
2 stops
LHR6:30 amLondon Heathrow
Nov 26
LHR6:00 pmLondon Heathrow
27h 29m
1 stop
STL3:29 pmLambert-St Louis
$535
Find similar
Air Canada
Mar 1
STL4:05 pmLambert-St Louis
22h 30m
2 stops
LHR8:35 pmLondon Heathrow
Mar 13
LHR6:00 pmLondon Heathrow
25h 18m
2 stops
STL2:18 pmLambert-St Louis
$536
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 September 17, 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 10/14

10:45 am-8:50 am

2 stops16h 05m

London Heathrow

Wed 10/22

6:30 am-5:29 pm

2 stops16h 59m

$530

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 1/19

4:05 pm-8:30 am

1 stop10h 25m

London Heathrow

Fri 1/30

1:00 pm-3:29 pm

1 stop32h 29m

$531

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 12/8

3:19 pm-11:20 am

2 stops14h 01m

London Heathrow

Tue 12/16

8:00 am-7:48 pm

2 stops17h 48m

$543

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 1/15

1:48 pm-8:15 am

1 stop12h 27m

London Heathrow

Mon 1/26

7:40 pm-9:57 am

2 stops20h 17m

$561

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 1/10

3:11 pm-5:55 am

1 stop32h 44m

London Heathrow

Sun 1/18

6:00 pm-3:29 pm

1 stop27h 29m

$566

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 11/17

2:17 pm-8:15 am

1 stop11h 58m

London Heathrow

Sun 11/23

3:00 pm-10:34 pm

1 stop13h 34m

$576

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 11/19

6:04 pm-12:00 pm

1 stop11h 56m

London Heathrow

Sun 11/23

3:00 pm-10:34 pm

1 stop13h 34m

$577

St. LouisGlasgow

STL - GLA

STLGLA

Lambert-St Louis

Wed 11/12

3:38 pm-12:50 pm

2 stops15h 12m

Glasgow Intl

Fri 11/21

11:40 am-12:02 am

2 stops18h 22m

$656

St. LouisManchester

STL - MAN

STLMAN

Lambert-St Louis

Tue 10/7

2:15 pm-1:10 pm

2 stops16h 55m

Manchester

Wed 10/15

9:20 am-8:26 pm

2 stops17h 06m

$688

St. LouisManchester

STL - MAN

STLMAN

Lambert-St Louis

Wed 12/10

5:54 pm-6:45 pm

2 stops18h 51m

Manchester

Mon 12/15

8:05 pm-4:50 pm

2 stops26h 45m

$689

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 $740. 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 $755.

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 $920 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 $751 on momondo.

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

You could potentially save up to 1% 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

Direct flights

None
There are no direct flights from St. Louis to United Kingdom. There are no popular flight routes from St. Louis to United Kingdom.
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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 $530Free CancellationRating
7.8
1,386 reviews
Search KLM flights
United AirlinesPriceFrom $580Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
British AirwaysPriceFrom $590Free CancellationRating
6.7
7,367 reviews
Search British Airways flights
DeltaPriceFrom $631Free CancellationRating
7.9
7,961 reviews
Search Delta flights
Air CanadaPriceFrom $634Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
American AirlinesPriceFrom $637Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
IberiaPriceFrom $666Free CancellationRating
7.0
2,925 reviews
Search Iberia flights
Scandinavian AirlinesPriceFrom $669Free CancellationRating
7.4
1,486 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $670Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom $699Free CancellationRating
7.4
664 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.

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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 $318
Flights to Manchesterfrom $391
Flights to Edinburghfrom $396
Flights to Glasgowfrom $374
Flights to Birminghamfrom $389
Flights to Newcastle upon Tynefrom $430
Flights to Belfastfrom $514
Flights to Bristolfrom $425
Flights to Invernessfrom $407
Flights to Liverpoolfrom $441
Flights to Aberdeenfrom $487
Flights to Leedsfrom $453